4.8 Article

Nail penetration-safe LiNi0.6Co0.2Mn0.2O2 pouch cells enabled by LiMn0.7Fe0.3PO4 cathode safety additive

期刊

JOURNAL OF POWER SOURCES
卷 512, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230505

关键词

Lithium ion battery; LiNi0.6Co0.2Mn0.2O2; LiMn0.7Fe0.3PO4; Nail-penetration test; Phase transformation

资金

  1. National Natural Science Foundation of China [21625304, 21733012, 21991150, 21991153]
  2. Ministry of Science and Technology [2016YFA0200703]

向作者/读者索取更多资源

The safety performance of Ni-rich layered oxide materials used in electrical vehicle batteries can be improved by introducing nanometer-sized LMFP particles, which delay the phase transformation of NCM622 during thermal runaway and reduce heat generation between charged cathode and liquid electrolyte.
Ni-rich layered oxide materials have become a major choice of cathode material for electrical vehicle batteries. However, it is an outstanding challenge to improve the safety performance of these batteries as the energy density of the batteries increases with higher Ni content in the cathode material. Here we demonstrate that Nirich LiNi0.6Co0.2Mn0.2O2 (NCM622) based 10 Ah pouch cells can pass nail-penetration and overcharging tests by introducing nanometer-sized LiMn0.7Fe0.3PO4 (LMFP) particles in the cathode slurry. Since LMFP exhibits appreciable Li storage capacity in the battery operation voltage window, it brings no compromise in electrochemical performance to the cell. It is shown that LMFP improves the safety feature of the cell by partially blocking the NCM622/electrolyte interface, thereby alleviates parasitic reaction between NCM622 and electrolyte, which delays the phase transformation of NCM622 during thermal runaway as well as reduces heat generation between charged cathode and liquid electrolyte.

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