Title:
COMPOSITE CARBON PARTICLES, METHOD FOR PRODUCING SAME, AND LITHIUM ION SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2020/105599
Kind Code:
A1
Abstract:
The present invention relates to composite carbon particles, each of which comprises a carbon particle (A) and a carbonaceous cover layer (B) that covers the surface of the carbon particle (A), and which has only one peak in the temperature range of 600°C or more but less than 620°C and one or more peaks in the temperature range of from 620°C to 1,000°C (inclusive) in the differential curve (DTG curve) of the TG curve as obtained in a thermogravimetric (TG) analysis in the air. The R value of the particles is preferably 0.10-0.40; and the variation coefficient of the R value is preferably 0.30 or less. The composite carbon particles according to the present invention enable the achievement of a lithium ion secondary battery which is excellent in terms of low-temperature charge and discharge rate characteristics, high-temperature storage characteristics and high-temperature cycle characteristics, while having low internal resistance and high coulombic efficiency.
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Inventors:
BAEK JINSEOK (JP)
TONEGAWA AKIHISA (JP)
MORI TAKASHI (JP)
KOHNO DAISUKE (JP)
TONEGAWA AKIHISA (JP)
MORI TAKASHI (JP)
KOHNO DAISUKE (JP)
Application Number:
PCT/JP2019/045132
Publication Date:
May 28, 2020
Filing Date:
November 18, 2019
Export Citation:
Assignee:
SHOWA DENKO KK (JP)
International Classes:
C01B32/21; C01B32/184; H01M4/36; H01M4/587
Domestic Patent References:
| WO2012039477A1 | 2012-03-29 |
Foreign References:
| JP2013201058A | 2013-10-03 | |||
| JP2014123561A | 2014-07-03 | |||
| JP2017045574A | 2017-03-02 |
Attorney, Agent or Firm:
SSINPAT PATENT FIRM (JP)
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