Unrevealing the effects of low temperature on cycling life of 21700-type cylindrical Li-ion batteries

Daozhong Hu, Gang Chen, Jun Tian, Ning Li*, Lai Chen, Yuefeng Su, Tinglu Song, Yun Lu, Duanyun Cao, Shi Chen, Feng Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The low-temperature performance of Li-ion batteries (LIBs) has important impacts on their commercial applications. Besides the metallic lithium deposition, which is regarded as one of the main failure mechanisms of the LIBs at low temperatures, the synergistic effects originating from the cathode, anode, electrolyte, and separators to the batteries are still not clear. Here, the 21700-type cylindrical batteries were evaluated at a wide range of temperatures to investigate the failure mechanism of batteries. Voltage relaxation, and the post-mortem analysis combined with the electrochemical tests, unravel that the capacity degradation of batteries at low temperature is related to the lithium plating at graphite anodes, the formation of unsatisfied solid deposited/decomposed electrolyte mixture phase on the anode, the precipitation of solvent in the electrolytes and the block of separator pores, and the uneven dissolved transition metal-ions from the cathode. We hope this finding may open up a new avenue to alleviate the capacity degradation of advanced LIBs at low temperatures and shed light on the development of outstanding low-temperature LIBs via simultaneous optimization of all the components including electrodes, electrolytes and separators.

Original languageEnglish
Pages (from-to)104-110
Number of pages7
JournalJournal of Energy Chemistry
Volume60
DOIs
Publication statusPublished - Sept 2021

Keywords

  • Cycling life
  • Lithium plating
  • Low temperature
  • Solid deposited/decomposed electrolyte mixture phase
  • Voltage relaxation

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