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1. (WO2014195995) LITHIUM-ION SECONDARY BATTERY

Pub. No.:    WO/2014/195995    International Application No.:    PCT/JP2013/003539
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Thu Jun 06 01:59:59 CEST 2013
IPC: H01M 10/0587
H01M 4/485
H01M 10/052
Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA
トヨタ自動車株式会社
Inventors: MORITA, Masahiro
森田 昌宏
Title: LITHIUM-ION SECONDARY BATTERY
Abstract:
[Problem] To provide a lithium-ion secondary battery capable of suppressing the increase of internal resistance while reducing leakage current after the occurrence of separator shutdown. [Solution] A lithium-ion secondary battery has a winding body formed by winding a sheet body around an axis, said sheet body including a power generation element in which a positive electrode body and a negative electrode body are stacked with a separator in between. In the lithium-ion secondary battery, when, in a direction of the axis, the width from an end of the separator to the position corresponding to a coating end of the negative electrode body is denoted by A and the width from the end of the separator to the other end thereof is denoted by B, an equation (1) below is satisfied. In addition, an active material particle of the positive electrode body forms a hollow structure having a secondary particle in which a plurality of primary particles of a lithium transition metal oxide are aggregated and a hollow portion formed inside the secondary particle, and a through-hole penetrating from the exterior to the hollow portion is formed in the secondary particle. 0.02 ≤ A/B ≤ 0.05 ••••• (1)