Ion-Permselective Polyphenylene Sulfide-Based Solid-State Separator for High Voltage LiNi0.5Mn1.5O4 Battery. Issue 7 (1st July 2022)

• Record Type: Journal Article
• Authors: Yu, Chongchen; Zhou, Haitao; Wu, Jian-Chun; Han, Jiacheng; Zhou, Haiyun; Ling, Feng; Hou, Dong; Gao, Hongquan
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 7(2022)
• Publication Date: 2022-07-01
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac8244
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The decomposition of commonly used commercial electrolytes under high voltage and the continuous side reactions at the graphite anode make the rapid capacity decay of LiNi0.5 Mn1.5 O4 (LNMO)/graphite full cell during cycling. In this work, we adopt ion-permselective polyphenylene sulfide-based solid state separator (PPS-SSS) for LNMO batteries, PPS-SSS can effectively prevent the proton diffusion, block the HF generated on the LNMO cathode from attacking the anode SEI layer, and mitigate the Mn 2+ transfer. The PPS-SSS with anodic polyethylene (PE) protection (PE-PPS-CSSS) significantly improved the cycling performance of LNMO batteries. In the LNMO/Li half-cell system, 93% capacity retention rate can be achieved after 140 cycles at 0.5 C, and in the LNMO/graphite full-cell system, 85% of the initial capacity can be maintained after 100 cycles. Moreover, flight secondary ion mass spectrometry (TOF-SIMS) and X-ray photoelectron spectroscopy (XPS) are applied to explore the interfacial reactions of LNMO/graphite batteries and reveal the key mechanism for the stable cycling using PPS-SSS.