Application of tris(trimethylsilyl)borate to suppress self-discharge of layered nickel cobalt manganese oxide for high energy battery. (1st August 2016)

• Record Type: Journal Article
• Authors: Liao, Xiaolin; Sun, Peiyi; Xu, Mengqing; Xing, Lidan; Liao, Youhao; Zhang, Liping; Yu, Le; Fan, Weizhen; Li, Weishan
• Is Part Of: Applied energy. Volume 175(2016)
• Page Start: 505
• Page End: 511
• Publication Date: 2016-08-01
• Subjects: Layered nickel cobalt manganese oxide -- High potential -- Self-discharge -- Solid electrolyte interphase -- Electrolyte additive; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2016.03.114
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: TMSB is an effective additive for self-discharge suppression of charged LNCM under 4.5 V. SEI film is formed on LNCM at initial stage of cycling due to preferential oxidation of TMSB. Electrochemical oxidation decomposition of electrolyte during charge under 4.5 V is suppressed. Chemical interaction between charged LNCM and electrolyte during storage is avoided. Abstract: Tris(trimethylsilyl)borate (TMSB) is applied to suppress the self-discharge of charged LiNi1/3 Co1/3 Mn1/3 O2 (LNCM) under high potential. The contribution of TMSB is understood via physical and electrochemical characterizations. It is found that the charged LNCM under 4.5 V suffers serious self-discharge: potential drops to 0.5 V and crystal structure collapses, but this self-discharge is effectively suppressed by applying TMSB in a standard (STD) electrolyte. Different from the failure from cycling, which is caused mainly by the electrochemical oxidation decomposition of electrolyte, the self-discharge results from the interaction between charged LNCM and electrolyte. TMSB is preferentially oxidized in comparison with STD electrolyte, generating a solid electrolyte interphase film on LNCM, which avoids the direct contact between LNCM and electrolyte and thus suppresses the self-discharge of the charged LNCM.