WO2021246571A1 - 신규한 조립구상흑연의 제조방법 - Google Patents
신규한 조립구상흑연의 제조방법 Download PDFInfo
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- WO2021246571A1 WO2021246571A1 PCT/KR2020/010578 KR2020010578W WO2021246571A1 WO 2021246571 A1 WO2021246571 A1 WO 2021246571A1 KR 2020010578 W KR2020010578 W KR 2020010578W WO 2021246571 A1 WO2021246571 A1 WO 2021246571A1
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- graphite
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/205—Preparation
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/50—Agglomerated particles
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a novel method for manufacturing granulated spherical graphite, and specifically, when manufacturing spherical graphite having a particle diameter of several tens of nm obtained from flaky natural graphite by a mechanical process, manufacturing composite spherical graphite from natural graphite discarded in the mechanical process It relates to a novel method for producing granular spherical graphite.
- a battery required according to such a situation is a lithium ion secondary battery that satisfies the miniaturization and weight reduction of the battery.
- a carbonaceous material such as graphite is used as an anode active material of the battery.
- the graphite of the carbonaceous material used as the anode active material for the secondary battery should be used in a spherical shape for the charge/discharge efficiency of the battery, and more preferably, it should be used in a crystalline spherical shape.
- Various methods are known for the preparation of spherical graphite used as an anode active material for secondary batteries.
- Flakes of natural graphite can be purchased inexpensively, but the production efficiency of crystalline spheroidal graphite from flaky natural graphite is as low as about 30% as described above, and consequently, high cost is required to manufacture crystalline spheroidal graphite.
- An object of the present invention is to provide a method for manufacturing granulated spherical graphite that can be mass-produced by using discarded natural graphite with high efficiency and low cost and easy to manufacture.
- step b) mixing the pulverized natural graphite of step a) with liquid pitch including a solvent and pitch ('mixing step');
- step c) removing all or part of the solvent from the mixture in which the mixing of step b) is completed ('solvent removal step');
- step d) preparing granulated spheroidized graphite by granulating the mixture from which the solvent of step c) has been removed ('assembly spheroidizing step');
- the novel method for manufacturing granulated spheroidal graphite according to the present invention has advantages of low cost, high efficiency, and mass production due to ease of manufacture.
- Example 1 is a SEM of the natural graphite fine powder prepared in step a) of Example 1 of the method for producing granular spherical graphite of the present invention.
- Example 2 is an SEM of one granulated spherical graphite prepared according to Example 1 of the present invention.
- Figure 3 is a SEM of the granular spherical graphite aggregate prepared according to Example 1 of the present invention.
- An object of the present invention is to provide a method for manufacturing granulated spherical graphite that can be mass-produced at low cost with high efficiency.
- step b) mixing the pulverized natural graphite of step a) with liquid pitch including a solvent and pitch ('mixing step');
- step c) removing all or part of the solvent from the mixture in which the mixing of step b) is completed ('solvent removal step');
- step d) preparing granulated spheroidized graphite by granulating the mixture from which the solvent of step c) has been removed ('assembly spheroidizing step');
- the 'flaky natural graphite' in step a) may have an average particle diameter of 5 ⁇ m to 500 ⁇ m, preferably 5 ⁇ m to 100 ⁇ m, and the average particle diameter If it exceeds this 500 ⁇ m, the overall manufacturing time increases, which is economically undesirable.
- the pulverization of natural graphite in step a) of the method for producing granular spherical graphite of the present invention is made by a high-speed mechanical milling device such as a hammer mill, a jet mill, a bead mill, or a mixture thereof, and preferably a jet mill is used. do.
- a high-speed mechanical milling device such as a hammer mill, a jet mill, a bead mill, or a mixture thereof, and preferably a jet mill is used. do.
- the working pressure of the hammer mill, the jet mill, and the bead mill is used as a pressure required for each used mill, and the pressure in the case of pulverization using the jet mill is 5.5 bar to 9.9 bar.
- the pulverized product of natural graphite through a pulverization process using a jet mill or the like from scaled natural graphite as described above is obtained by using an ultra-fine classifier such as Turbo to have an average particle diameter of 1 ⁇ m or less and a Tap Density of 0.2 g/cc to 0.3 g/cc. Only natural graphite particles are selected and classified. Natural graphite particles with an average particle diameter of 1 ⁇ m or less, classified and selected in this way, are called ‘undifferentiated natural graphite’.
- the SEM of the 'micronized natural graphite' has an acute angle on its surface as shown in FIG. 1 .
- the amount of solvent and pitch used in the 'liquid pitch including solvent and pitch' is 80:20 to 50:50 by weight. is the range
- the solvent may be any solvent capable of dissolving the pitch, preferably mineral oil such as kerosene, heavy oil, light oil; hydrocarbon solvents such as toluene and decane; heteroatom-containing solvents such as acetone, tetrahydropurine, and pyridine; and at least one selected from the group consisting of mixtures thereof, and more preferably mineral oil such as kerosene and heavy oil.
- mineral oil such as kerosene, heavy oil, light oil
- hydrocarbon solvents such as toluene and decane
- heteroatom-containing solvents such as acetone, tetrahydropurine, and pyridine
- at least one selected from the group consisting of mixtures thereof, and more preferably mineral oil such as kerosene and heavy oil preferably mineral oil such as kerosene and heavy oil.
- the pitch is petroleum pitch-based, coal-based pitch, or a polymer resin, preferably petroleum-based pitch.
- the liquid pitch has a viscosity of 2,000 to 20,000 cP.
- the amount of 'micronized natural graphite and liquid pitch' used in the 'mixing step' of step b) in the manufacturing method of the granulated spherical graphite of the present invention is in the range of 80:20 to 50:50 in weight% ratio.
- the usage ratio of the liquid pitch is less than 20% by weight, the spheroidization of the pulverized natural graphite is not partially made, and the fine powder of natural graphite that has not been granulated may increase, so that the manufacturing efficiency of the granulated spherical graphite may be reduced, and
- the usage ratio of the liquid pitch is more than 50% by weight, the difference in the average particle diameter of the manufactured granular graphite becomes large, so that the production yield of the granulated spherical graphite particles of a particle diameter that can be used, such as an anode active material for a secondary battery, is a problem can occur.
- the mixing in the 'mixing step' of step b) of the method for producing granular spherical graphite of the present invention is performed by mixing a mixture of liquid pitch and pulverized natural graphite with a mixer such as a screw mixer at a temperature of 50°C to 200°C. Mix by stirring at a speed of 100 to 800 rpm for 2 to 8 hours.
- the solvent removal in the 'solvent removal step' of step c) of the method for producing granular spherical graphite of the present invention is performed under reduced pressure.
- the degree of reduced pressure used may be a reduced pressure capable of removing 50% or more, preferably 70% or more, more preferably 80% or more of the solvent used, and the time taken at this time may be determined in connection with the reduced pressure. have.
- 80% or more of the solvent was removed for 1 hour under a reduced pressure of 50 torr.
- the solvent is removed using the vacuum pressure at room temperature.
- the 'assembly spheroidization step' of step d) of the manufacturing method of the granulated spheroidal graphite of the present invention is a step of preparing the granulated spheroidized graphite using the granulated spheroidizer using the reduced pressure-treated mixture in step c).
- the assembly spheroidizer is a rotatable device known in the art, and a blade is formed on the rotor, and a spheroidizing device that applies friction and shear stress to the reduced pressure-treated mixture during rotation is preferable. It seems that the spheroidization of the atomized graphite occurs due to the friction and shear stress applied to the reduced pressure-treated mixture.
- the assembly spheroidizer is operated with a rotational force of 3,000rpm to 8,000rpm, and preferably operates with a rotational force of 4,500rpm to 6,000rpm.
- the operating time at the rotational force is 100 seconds to 600 seconds, preferably 150 seconds to 400 seconds.
- the 'heat treatment step' of step e) of the method for producing granulated spheroidal graphite of the present invention is a step of heat-treating the granulated spheroidized graphite prepared in the granulated spheroidization step of step d), and the pitch and / or solvent used through this carbonizes, removes impurities, and improves the surface properties of granulated spheroidized graphite.
- the heat treatment temperature is 200 °C to 500 °C, preferably 300 °C to 400 °C, more preferably 350 °C to 400 °C.
- the time for the heat treatment is 0.5 hours to 2.5 hours, preferably 1 hour to 2 hours.
- step f) of the method for producing granular spherical graphite of the present invention includes carbonization, removal of impurities, and surface properties of the manufactured granular graphite through heat treatment in step e). is the step of classifying
- the classification step it is to remove fines of a specific size or less among the granulated spherical graphite particles that have been manufactured in the ‘heat treatment step’ of step e).
- the specific size may be in the range of a particle size (D50) of 5 ⁇ m to 30 ⁇ m, preferably 8 ⁇ m to 25 ⁇ m.
- This particle size is a size that can be used in each industry, and can be used, for example, in the anode material industry of a secondary battery.
- the classification uses an air classifier known in the art, and the granular graphite having a particle size (D50) of less than 5 ⁇ m or greater than 30 ⁇ m obtained by classification proceeds to the 'micronization step of natural graphite' of step a) again or , or for other industrial purposes.
- D50 particle size
- FIG. 2 The SEM of one particle of the combined spherical graphite prepared by the manufacturing method of the combined spherical graphite of the present invention including steps a) to f) is shown in Figure 2, and Figure 3 is the SEM of the prepared granular spherical graphite aggregate it will indicate As seen in the SEM of these Figures 2 and 3, the combined spherical graphite produced by the method for producing the combined spherical graphite of the present invention shows a spherical shape.
- Natural graphite particles with an average particle diameter of 1 ⁇ m or less were selected and classified using a turbo classifier, an ultra-fine classifier, by pulverizing a flaky natural graphite raw material with a size of 5 to 100 ⁇ m with a jet mill set to a grinding pressure of 5.5 bar to 9.9 bar ( 'a) step').
- 700 parts by weight of kerosene and 300 parts by weight of petroleum pitch were put in a screw mixer and the pitch was dissolved for 1 hour to prepare a liquid pitch.
- 300 parts by weight of the prepared liquid pitch and 700 parts by weight of natural graphite particles having an average particle diameter of 1 ⁇ m or less were placed in a screw mixer and mixed at a speed of 200 rpm at a temperature of 150° C.
- step d) of Example 1 was changed to 'Put the pressure-reduced mixture into the granulated spheroidizer and process at 4,500 rpm for 150 seconds to complete the granulated spheroidal graphite'
- the final granulated spherical graphite was prepared.
- step d) of Example 1 was changed to 'Put the pressure-reduced mixture into the granulation machine and process at 4,500 rpm for 350 seconds to complete the granulated spheroid graphite'
- the final granulated spherical graphite was prepared.
- step d) of Example 1 was changed to 'Put the pressure-reduced mixture into the granulator and process at 6,000 rpm for 170 seconds to complete the granulated spheroidal graphite'
- the final granulated spherical graphite was prepared.
- step d) of Example 1 was changed to 'Put the pressure-reduced mixture into the granulator and process at 3,500 rpm for 600 seconds to complete the granulated spheroidal graphite'
- the final granulated spherical graphite was prepared.
- step b) of Example 1 '700 parts by weight of kerosene and 300 parts by weight of petroleum pitch were put in a screw mixer and the pitch was dissolved for 1 hour to prepare a liquid pitch.
- the same method as in Example 1 except that 300 parts by weight of the prepared liquid pitch and 700 parts by weight of natural graphite particles having an average particle diameter of 1 ⁇ m or less were placed in a screw mixer and mixed at a speed of 200 rpm at a temperature of 150° C. for 0.5 hours. to prepare the final granulated spherical graphite.
- Step b) and c) of Example 1 are '900 parts by weight of natural graphite atomized with an average particle diameter of 1 ⁇ m or less and 100 parts by weight of a petroleum pitch having an average particle diameter of 4 ⁇ m in a granulation spheroidizer and processed at 4,500 rpm for 260 seconds
- the final granulated spherical graphite was prepared in the same manner as in Example 1, except that it was changed to a single step of 'to do'.
- Table 1 shows the yield, sphericity, particle size (D50), tap density, and specific surface area of the granulated graphite prepared under the process conditions of Examples 1 to 5, Comparative Example 1, and Comparative Example 2.
- Yield was measured as a weight ratio before/after air classification, sphericity was measured through SEM analysis, and particle size (D50), tap density, and specific surface area were analyzed, respectively.
- Examples 1 to 5 of Table 1 are prepared by the method for producing granulated spherical graphite of the present invention comprising steps a) to f) of the present invention
- Comparative Example 1 is the method for manufacturing granulated spherical graphite of the present invention 'b ), a mixture of pulverized natural graphite and liquid pitch for “0.5 hours” outside the range of ‘2 to 8 hours’, which is the mixing time of the mixture of pulverized natural graphite and liquid pitch in the ‘mixing step’ step
- Example 2 was prepared by omitting the 'b) step of mixing' of the manufacturing method of the granulated spherical graphite of the present invention.
- the novel method of manufacturing granulated graphite of the present invention is inexpensive, but invents a step of pulverizing natural graphite in flaky form, which is discarded during the manufacturing process of manufacturing granulated graphite from conventional flaky natural graphite, and mixing it with liquid pitch.
- a step of pulverizing natural graphite in flaky form which is discarded during the manufacturing process of manufacturing granulated graphite from conventional flaky natural graphite, and mixing it with liquid pitch.
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Abstract
Description
| 조립구상흑연 | |||||
| 수율(%) | 입도 (D50), ㎛ | 구형화도(장/단) | Tap 밀도, g/cc | 비표면적, m2/g | |
| 실시예 1 | 71 | 15 | 1.1 | 0.82 | 6.2 |
| 실시예 2 | 85 | 8 | 1.3 | 0.85 | 6.5 |
| 실시예 3 | 60 | 23 | 1.2 | 0.77 | 5.9 |
| 실시예 4 | 68 | 15 | 1.2 | 0.86 | 5.8 |
| 실시예 5 | 18 | 12 | 1.4 | 0.76 | 8.6 |
| 비교예 1 | 12 | 14 | 1.3 | 0.75 | 9.1 |
| 비교예 2 | 7 | 15 | 1.3 | 0.74 | 9.3 |
Claims (10)
- a) 인편상의 천연 흑연을 미분화하는 천연 흑연의 미분화 단계;b) 상기 a) 단계의 미분화된 천연 흑연을 용매와 피치를 포함하는 액상 피치와 혼합하는 단계;c) 상기 b) 단계의 혼합이 완료된 혼합물 중 용매의 전부 또는 일부를 제거하는 단계;d) 상기 c) 단계의 용매가 제거된 혼합물을 조립 구상화하여 조립 구상화된 흑연을 제조하는 단계;e) 상기 d) 단계의 조립 구상화된 흑연을 열처리하는 단계; 및f) 상기 e) 단계의 열처리된 조립구상흑연을 분급하는 단계;를 포함하는 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항에 있어서, 상기 a) 천연 흑연의 미분화 단계는 5 내지 500㎛의 인편상 천연 흑연을 1㎛ 이하의 천연 흑연으로 미분화하는 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항에 있어서, b) 단계의 액상 피치 중 용매 및 피치의 사용량은 중량% 비율로 80:20 내지 50:50의 범위이며, 상기 용매는 등유, 중유 경유 등의 광유; 톨루엔, 데칸 등의 탄화수소 용매; 아세톤, 테트라히드로푸린, 피리딘 등의 헤테로원자 함유 용매; 및 이들의 혼합물로 이루어진 그룹으로부터 선택되는 하나 이상이고, 피치는 석유 피치계, 석탄계 피치, 또는 고분자 수지인 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항에 있어서, 상기 b) 단계에서 ‘미분화된 천연 흑연과 액상 피치’의 사용량은 중량% 비율로 80:20 내지 50:50의 범위인 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항에 있어서, 상기 b) 단계에서의 혼합은 액상 피치와 미분화된 천연 흑연의 혼합물을 혼합기를 이용하여 50℃ 내지 200℃의 온도에서 2시간 내지 8시간 동안 100 내지 800rpm의 속도로 교반하여 혼합하는 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항에 있어서, 상기 c) 단계의 용매 제거는 b) 단계에서 사용된 용매의 50% 이상을 제거하는 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항에 있어서, 상기 d) 단계의 조립 구상화는 3,000rpm 내지 8,000rpm의 회전력으로 작동하는 조립 구상화기를 이용하며, 작동시간은 100초 내지 600초인 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항에 있어서, 상기 e) 열처리 단계의 열처리 온도는 200℃ 내지 500℃이고, 열처리 시간은 0.5시간 내지 2.5시간인 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항에 있어서, 상기 f)의 분급 단계에서 분급으로 얻어지는 조립구상흑연의 입경(D50)은 5㎛ 내지 30㎛의 범위이며, 상기 5㎛ 내지 30㎛의 범위를 벗어난 조립구상흑연은 상기 a) 단계로 진행되는 것을 특징으로 하는, 조립구상흑연의 제조방법
- 제1항 내지 제9항 중 어느 한 항에 따라 제조된 조립구상흑연
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022574227A JP7315800B2 (ja) | 2020-06-03 | 2020-08-11 | 新規の造粒球状黒鉛の製造方法 |
| EP20939312.3A EP4151594A4 (en) | 2020-06-03 | 2020-08-11 | NEW METHOD FOR PRODUCING RAW SPHERICAL GRAPHITE |
| US17/928,854 US11746019B2 (en) | 2020-06-03 | 2020-08-11 | Method for producing conglomeration graphite |
| CN202080101495.0A CN115667139A (zh) | 2020-06-03 | 2020-08-11 | 制造粗球状石墨的新方法 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020200067265A KR102254549B1 (ko) | 2020-06-03 | 2020-06-03 | 신규한 조립구상흑연의 제조방법 |
| KR10-2020-0067265 | 2020-06-03 |
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| Publication Number | Publication Date |
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| WO2021246571A1 true WO2021246571A1 (ko) | 2021-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/KR2020/010578 Ceased WO2021246571A1 (ko) | 2020-06-03 | 2020-08-11 | 신규한 조립구상흑연의 제조방법 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US11746019B2 (ko) |
| EP (1) | EP4151594A4 (ko) |
| JP (1) | JP7315800B2 (ko) |
| KR (1) | KR102254549B1 (ko) |
| CN (1) | CN115667139A (ko) |
| WO (1) | WO2021246571A1 (ko) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115403039A (zh) * | 2022-08-24 | 2022-11-29 | 大同氢都驰拓新能源有限公司 | 一种能同时产出两种规格球形石墨的生产系统和方法 |
| WO2024003801A1 (en) * | 2022-06-29 | 2024-01-04 | Talga Technologies Limited | Composite anode material and method for producing same |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102480217B1 (ko) | 2021-07-29 | 2022-12-22 | 주식회사 엘피엔 | 신규한 조립구상흑연, 이를 음극활물질로 포함하는 이차전지, 및 상기 조립구상흑연의 제조방법 |
| KR102691511B1 (ko) | 2022-05-20 | 2024-08-05 | 주식회사 엘피엔 | 신규한 조립구상흑연의 제조방법, 이를 이용하여 제조된 조립구상흑연, 및 이를 음극활물질로 포함하는 이차전지 |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP7315800B2 (ja) | 2023-07-26 |
| CN115667139A (zh) | 2023-01-31 |
| EP4151594A1 (en) | 2023-03-22 |
| US20230192498A1 (en) | 2023-06-22 |
| KR102254549B1 (ko) | 2021-05-20 |
| US11746019B2 (en) | 2023-09-05 |
| EP4151594A4 (en) | 2024-10-02 |
| JP2023523088A (ja) | 2023-06-01 |
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