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Surface coating of a LiNi x Co y Al 1− x − y O 2 ( x > 0.85) cathode with Li 3 PO 4 for applying a water-based hybrid polymer binder during Li-ion battery preparation

2021; Royal Society of Chemistry; Volume: 11; Issue: 59 Linguagem: Inglês

10.1039/d1ra06409f

2046-2069

Tatsuya Watanabe, Tamae Yokokawa, Mitsuru Yamada, Shoudai Kurosumi, Shinsaku Ugawa, Hojin Lee, Yuta Irii, Fumihiko Maki, Takao Gunji, Jianfei Wu, Futoshi Matsumoto,

Advanced Battery Technologies Research

To produce water-stable Ni-rich lithium nickel cobalt aluminum oxides (LiNi x Co y Al1-x-y O2, x > 0.85, NCAs), the formation of trilithium phosphate (Li3PO4)-coated layers on the NCA surfaces was attempted through the use of a surface reaction in a mixture of ethanol and water and a post-heat treatment at 350 and 400 °C. Based on the results of X-ray photoelectron spectroscopy (XPS), the coated layers consisted of nickel phosphate (Ni3(PO4)2) and Li3PO4. The coated NCA surface could have sufficient water stability to maintain the cathode performance in a water slurry for 1 day. In addition, the coated layers formed on the NCA surfaces did not block Li+-ion transfer through the Ni3(PO4)2/Li3PO4-coating layers and enhanced the high-rate discharge performance.