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1. (WO2017038669) LITHIUM ION SECONDARY BATTERY

Pub. No.:    WO/2017/038669    International Application No.:    PCT/JP2016/074944
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Aug 27 01:59:59 CEST 2016
IPC: H01M 4/13
H01M 4/36
H01M 4/38
H01M 4/48
H01M 4/62
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: KIMURA Naoki
木村 尚貴
SEKI Eiji
關 栄二
SHIN Seogchul
申 ソクチョル
Title: LITHIUM ION SECONDARY BATTERY
Abstract:
To increase the capacity of a lithium ion secondary battery, and to elongate the service life of the lithium ion secondary battery. A lithium ion secondary battery which is provided with a negative electrode, a positive electrode and a separator, and wherein: the negative electrode contains graphite, a negative electrode binder and an Si-based negative electrode active material containing silicon; and the discharge capacity Q (Ah/kg) of the negative electrode, and the break strength A (MPa) and the elongation at break B (%) of the negative electrode binder alone satisfy the following relational expression (1). 3 × Q ≥ (A × B ÷ 10) ≥ Q (1)