Poly(isobutylene-alt-maleic anhydride) binders containing lithium for high-performance Li-ion batteries

Anode materials including graphite are known to be thermodynamically unstable toward organic solvents and salts and become covered by a passivating film (Solid electrolyte interphase, SEI) which retards the kinetics because of the high electronic resistivity. To achieve high performance in lithium i...

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Bibliographic Details
Published inJournal of power sources Vol. 287; pp. 36 - 42
Main Authors Ku, Jun-Hwan, Hwang, Seung-Sik, Ham, Dong-Jin, Song, Min-Sang, Shon, Jeong-Kuk, Ji, Sang-Min, Choi, Jae-Man, Doo, Seok-Gwang
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2015
Subjects
Artificial SEI
Binder
Coulombic efficiency
Lithium ion battery
Coulombic efficiency
Lithium ion battery
Binder
Artificial SEI
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Summary:Anode materials including graphite are known to be thermodynamically unstable toward organic solvents and salts and become covered by a passivating film (Solid electrolyte interphase, SEI) which retards the kinetics because of the high electronic resistivity. To achieve high performance in lithium ion batteries (LIBs), the SEIs are required to be mechanically stable during repeated cycling and possess highly ion-conductive. In this work, we have investigated an artificial pre-SEI on graphite electrode using a polymer binder containing lithium (i.e., a Li-copolymer of isobutylene and maleic anhydride, Li-PIMA) and its effect on the anode performances. During charging, the polymer binder with the functional group (–COOLi) acts as a SEI component, reducing the electrolyte decomposition and providing a stable passivating layer for the favorable penetration of lithium ions. Hence, by using the binder containing lithium, we have been able to obtain the first Coulombic efficiency of 84.2% (compared to 77.2% obtained using polyvinylidene fluoride as the binder) and a capacity retention of 99% after 100 cycles. The results of our study demonstrate that binder containing lithium we have used is a favorable candidate for the development of high-performance LIBs. •A new binder is obtained by using a Li containing PIMA polymer.•An artificial pre-SEI can enhance the Coulombic efficiency and cyclability of LIBs.•Li-PIMA film prevents the formation of an additional SEI and facilitates the Li diffusion.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2015.04.007