Improved Cycling of Li||NMC811 Batteries under Practical Conditions by a Localized High-Concentration Electrolyte

Feng Guo, Xi Chen*, Yuhan Hou, Wenshuo Wei, Zhicheng Wang, Hao Yu, Jingjing Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Li||NMC811 battery, with lithium-metal (high specific capacity and low redox potential) as anode and LiNi0.8Co0.1Mn0.1O2 (NMC811) as cathode, has been widely accepted to be a good candidate as one of the high-energy-density batteries. However, its cyclability needs improvement to fulfill the requirement for its future commercial use, especially under practical conditions. Electrolyte plays a key role in improving the cycling performance of Li||NMC811 batteries, where a high voltage/electrochemical window and good stability with the electrodes of the electrolyte are required. Herein, a localized high-concentration electrolyte with an additive of lithium difluoro(oxalate)borate (LiDFOB) is reported that improves the cycling performance of Li||NMC811 cells under crucial conditions with Li foil thickness of 50 µm, cathode areal loading of 4 mAh cm−2, the areal capacity ratio between the negative and positive electrodes (N/P ratio) of 2.6 and the electrolyte/cell capacity ratio (E/C ratio) of 3.0 g (Ah)−1. These cells can maintain 80% of the capacity after 195 cycles.

Original languageEnglish
Article number2207290
JournalSmall
Volume19
Issue number16
DOIs
Publication statusPublished - 23 Jan 2023

Keywords

  • high energy density
  • lithium metal anodes
  • lithium-metal batteries
  • localized high-concentration electrolytes
  • practical condition

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