Enhanced electrochemical performance of Li2.72Na0.31MnPO4CO3 as a cathode material in "water-in-salt" electrolytes

Baowei Xie; Ryo Sakamoto; Ayuko Kitajou; Liwei Zhao; Kosuke Nakamoto; Shigeto Okada; Ken Albrecht; Wataru Kobayashi; Masaki Okada; Toshiya Takahara

doi:10.1039/d1cc04350a

Enhanced electrochemical performance of Li_2.72Na_0.31MnPO₄CO₃ as a cathode material in "water-in-salt" electrolytes

Chem Commun (Camb). 2021 Nov 30;57(95):12840-12843. doi: 10.1039/d1cc04350a.

Authors

Baowei Xie¹, Ryo Sakamoto¹, Ayuko Kitajou², Liwei Zhao³, Kosuke Nakamoto³, Shigeto Okada³, Ken Albrecht^{3

4}, Wataru Kobayashi⁵, Masaki Okada⁵, Toshiya Takahara⁵

Affiliations

¹ Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan.
² Graduate School of Sciences and Technology for Innovation, 2-16-1 Tokiwadai, Ube 755-8611, Japan.
³ Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan. nakamoto@cm.kyushu-u.ac.jp.
⁴ JST-PRESTO, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan.
⁵ Tosoh Corporation, 3-8-2, Shiba, Minato-Ku, Tokyo 105-8623, Japan.

PMID: 34787135
DOI: 10.1039/d1cc04350a

Abstract

A carbonophosphate compound of Li_2.72Na_0.31MnPO₄CO₃ was synthesized via ion exchange. The initial discharge capacity of Li_2.72Na_0.31MnPO₄CO₃ in 15 molal (or 15 m) LiTFSI was 110 mA h g^-1 at 2 mA cm^-2 (∼0.5C). Due to the decomposition of Li_2.72Na_0.31MnPO₄CO₃, the capacity retention degraded to 64% after 100 cycles.