电解质
阳极
锂(药物)
材料科学
相间
阴极
复合数
化学工程
发热
石墨
电极
硅
磷酸铁锂
纳米技术
电化学
化学
复合材料
冶金
内分泌学
物理化学
生物
遗传学
工程类
物理
医学
热力学
作者
Xiangchun Zhuang,Shenghang Zhang,Zili Cui,Bin Xie,Tianyu Gong,Xiaohu Zhang,Jiedong Li,Rongxian Wu,Shitao Wang,Lixin Qiao,Chang-Jiu Li,Shanmu Dong,Gaojie Xu,Lang Huang,Guanglei Cui
标识
DOI:10.1002/anie.202315710
摘要
High energy density lithium-ion batteries (LIBs) adopting high-nickel layered oxide cathodes and silicon-based composite anodes always suffer from unsatisfied cycle life and poor safety performance, especially at elevated temperatures. Electrode /electrolyte interphase regulation by functional additives is one of the most economic and efficacious strategies to overcome this shortcoming. Herein, cyano-groups (-CN) are introduced into lithium fluorinated phosphate to synthesize a novel multifunctional additive of lithium tetrafluoro (1,2-dihydroxyethane-1,1,2,2-tetracarbonitrile) phosphate (LiTFTCP), which endows high nickel LiNi0.8 Co0.1 Mn0.1 O2 /SiOx -graphite composite full cell with an ultrahigh cycle life and superior safety characteristics, by adding only 0.5 wt % LiTFTCP into a LiPF6 -carbonate baseline electrolyte. It is revealed that LiTFTCP additive effectively suppresses the HF generation and facilitates the formation of a robust and heat-resistant cyano-enriched CEI layer as well as a stable LiF-enriched SEI layer. The favorable SEI/CEI layers greatly lessen the electrode degradation, electrolyte consumption, thermal-induced gassing and total heat-releasing. This work illuminates the importance of additive molecular engineering and interphase regulation in simultaneously promoting the cycling and thermal safety of LIBs with high-nickel NCMxyz cathode and silicon-based composite anode.
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