Donghai Wang Wang

US Patent:

20190013513, Jan 10, 2019

Filed:

Jan 4, 2017

Appl. No.:

16/067795

Inventors:

- Santa Clara CA, US
Sergey D. LOPATIN - Morgan Hill CA, US
Eric H. LIU - Los Altos CA, US
Ajey M. JOSHI - San Jose CA, US
Guo AI - Guangdong, CN
Zhihui WANG - Fremont CA, US
Hui ZHAO - Boston MA, US
Donghai WANG - State College PA, US

International Classification:

H01M 4/139
H01M 4/62
H01M 4/04
H01M 4/38
H01M 4/587
H01M 4/36
H01M 4/48
H01M 10/0525

Abstract:

A simple solution processing method is developed to achieve uniform and scalable stabilized lithium metal powder coating on Li-ion negative electrode. A solvent and binder system for stabilized lithium metal powder coating is developed, including the selection of solvent, polymer binder and enhancement of polymer concentration. The enhanced binder solution is 1% concentration of polymer binder in xylene, and the polymer binder is chosen as the mixture of poly(styrene-co-butadiene) rubber (SBR) and polystyrene (PS). Long-sustained, uniformly dispersed stabilized lithium metal powder suspension can be achieved with the enhanced binder solution. A uniform stabilized lithium metal powder coating can be achieved with simple doctor blade coating method and the resulting stabilized lithium metal powder coating can firmly glued on the anode surface. With the prelithiation of negative electrode by stabilized lithium metal powder, improvements in electrochemical performances are demonstrated in both graphite/NMC and SiO/NMC full-cell.