Highly Oxidative-Resistant Cyano-Functionalized Lithium Borate Salt for Enhanced Cycling Performance of Practical Lithium-Ion Batteries

Xueqing Min, Changxing Han, Shenghang Zhang, Jun Ma, Naifang Hu, Jiedong Li, Xiaofan Du, Bin Xie, Hong Ji Lin, Chang Yang Kuo, Chien Te Chen, Zhiwei Hu, Lixin Qiao*, Zili Cui*, Gaojie Xu*, Guanglei Cui*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Lithium difluoro(oxalato) borate (LiDFOB) has been widely investigated in lithium-ion batteries (LIBs) owing to its advantageous thermal stability and excellent aluminum passivation property. However, LiDFOB tends to suffer from severe decomposition and generate a lot of gas species (e.g., CO2). Herein, a novel cyano-functionalized lithium borate salt, namely lithium difluoro(1,2-dihydroxyethane-1,1,2,2-tetracarbonitrile) borate (LiDFTCB), is innovatively synthesized as a highly oxidative-resistant salt to alleviate above dilemma. It is revealed that the LiDFTCB-based electrolyte enables LiCoO2/graphite cells with superior capacity retention at both room and elevated temperatures (e.g., 80 % after 600 cycles) with barely any CO2 gas evolution. Systematic studies reveal that LiDFTCB tends to form thin and robust interfacial layers at both electrodes. This work emphasizes the crucial role of cyano-functionalized anions in improving cycle lifespan and safety of practical LIBs.

Original languageEnglish
Article numbere202302664
JournalAngewandte Chemie - International Edition
Volume62
Issue number34
DOIs
StatePublished - 21 Aug 2023

Keywords

  • Anionic Chemistry
  • Electrode/Electrolyte Interphases
  • High-Temperature Performance
  • Lithium Salt
  • Practical Lithium-Ion Battery

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