Achieving a Highly Stable Electrode/Electrolyte Interface for a Nickel-Rich Cathode via an Additive-Containing Gel Polymer Electrolyte

• DOI: 10.1021/acsami.2c09103
• Publication Date: 2022-08-04T16:45:35Z
• Authors: Guanjie Li; Yun Feng; Jingyi Zhu; Changyong Mo; Qinqin Cai; Youhao Liao; Weishan Li
• Keywords: 01 natural sciences; 0104 chemical sciences

The nickel-rich cathode LiNi0.8Co0.1Mn0.1O2 (NCM811) is deemed as a prospective material for high-voltage lithium-ion batteries (LIBs) owing to its merits of high discharge capacity and low cobalt content. However, the unsatisfactory cyclic stability thermostability that originate from unstable electrode/electrolyte interface restrict commercial application. Herein, novel electrolyte composed polyethylene (PE) supported poly(vinylidene fluoride-co-hexafluoropropylene) (P(VdF-HFP)) based gel polymer (GPE) strengthened by film-forming additive 3-(trimethylsilyl)phenylboronic acid (TMSPB) proposed. porous structure good oxidative P(VdF-HFP)/PE membrane help expand potential GPE 5.5 V compared with 5.1 liquid electrolyte. developed also has better thermal stability, contributing improving safety performance LIBs. Furthermore, TMSPB constructs low-impedance stable interphase (CEI) on NCM811 surface, compensating GPE's drawbacks sluggish kinetics. Consequently, matched 3% TMSPB-containing exhibits remarkable cyclicity rate capability, maintaining 94% initial after 100 cycles at voltage range 3.0–4.35 delivering 133.5 mAh g–1 under 15 C current 68% 75.8 one an additive-free By virtue enhanced NCM811cathode, cyclability graphite||NCM811 full cell increases 48 81% cycles. incorporation P(VdF-HFP)-based points out viable convenient pathway unlock properties energy density satisfactory next-generation