Title:
GRAPHITE-BASED NEGATIVE ELECTRODE ACTIVE MATERIAL, NEGATIVE ELECTRODE, AND LITHIUM ION SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2015/152113
Kind Code:
A1
Abstract:
This graphite-based negative electrode active material includes first graphite particles which are spherically formed; and second graphite particles having a lower roundness than the first graphite particles. The content of the second graphite particles is 1-30 mass% of the sum total of the first graphite particles and the second graphite particles. The ratio (D50/D5) of the median particle size (D50) of the first graphite particles to the particle size (D5) of the first graphite particles at 5 cumulative% in the cumulative distribution thereof is less than the ratio (D50/D5) of the median particle size (D50) of the second graphite particles to the particle size (D5) of the second graphite particles at 5 cumulative% in the cumulative distribution thereof. The saturated tap density of mixed particles obtained by mixing the first graphite particles and the second graphite particles is greater than both the saturated tap density of the first graphite particles and the saturated tap density of the second graphite particles.
Inventors:
TAKEDA KOUZOU (JP)
TAKAHASHI HIROO (JP)
KONO YASUTAKA (JP)
TAKAHASHI HIROO (JP)
KONO YASUTAKA (JP)
Application Number:
PCT/JP2015/059840
Publication Date:
October 08, 2015
Filing Date:
March 30, 2015
Export Citation:
Assignee:
NEC ENERGY DEVICES LTD (JP)
International Classes:
H01M4/587; H01M4/36; H01M10/0525; H01M10/0566
Foreign References:
| JP2010251315A | 2010-11-04 | |||
| JP2013201104A | 2013-10-03 | |||
| JP2013254746A | 2013-12-19 | |||
| JP2010092649A | 2010-04-22 | |||
| JP2009026514A | 2009-02-05 | |||
| JP2010073618A | 2010-04-02 | |||
| JP2004127913A | 2004-04-22 |
Other References:
See also references of EP 3128586A4
Attorney, Agent or Firm:
MIYAZAKI, Teruo et al. (JP)
Akio Miyazaki (JP)
Akio Miyazaki (JP)
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