Watanabe T, Yokokawa T, Yamada M, Kurosumi S, Ugawa S, Lee H, Irii Y, Maki F, Gunji T, Wu J, Matsumoto F. Surface coating of a LiNi
x Co
y Al
1-x-y O
2 (
x > 0.85) cathode with Li
3PO
4 for applying a water-based hybrid polymer binder during Li-ion battery preparation.
RSC Adv 2021;
11:37150-37161. [PMID:
35496403 PMCID:
PMC9043788 DOI:
10.1039/d1ra06409f]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 10/20/2021] [Indexed: 11/21/2022] Open
Abstract
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.
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