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1. (WO2017148500) LITHIUM-ION BATTERY FORMATION PROCESS

Pub. No.:    WO/2017/148500    International Application No.:    PCT/EP2016/054216
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Tue Mar 01 00:59:59 CET 2016
IPC: H01M 10/0567
H01M 10/44
Applicants: TOYOTA MOTOR EUROPE
TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventors: SAKURAI, Takahiro
Title: LITHIUM-ION BATTERY FORMATION PROCESS
Abstract:
A method of performing a formation process for a lithium-ion cell (10) comprising an anode (12), a cathode (16), an electrolyte (22) and a separator (20), the formation process including adding an additive to the electrolyte (22) for improving a solid electrolyte interface (24) build-up on the anode (12), determining a SEI formation end voltage value at which the SEI build-up is completed by determining the additive concentration in the SEI (24), charging the cell (10) at the first predetermined rate up to the SEI formation end voltage, and then charging the cell (10) to a fully charged capacity at a second charge rate, the second charge rate being greater than the first charge rate.