Improved Initial Charging Capacity of Na-poor Na0.44MnO2 via Chemical Presodiation Strategy for Low-cost Sodium-ion Batteries

doi:10.1007/s40242-021-0438-6

Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (2): 274-279.doi: 10.1007/s40242-021-0438-6

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Improved Initial Charging Capacity of Na-poor Na_0.44MnO₂ via Chemical Presodiation Strategy for Low-cost Sodium-ion Batteries

ZHOU Xi¹, LAI Yangyang¹, WU Xiangjiang¹, CHEN Zhongxue², ZHONG Faping³, AI Xinping¹, YANG Hanxi¹, CAO Yuliang¹

1. Engineering Research Center of Organosilicon Compounds and Materials of Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China;
2. Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, P. R. China;
3. National Engineering Research Center of Advanced Energy Storage Materials, Hunan Corun New Energy Co., Ltd., Changsha 410205, P. R. China

Received:2020-12-25 Online:2021-04-01 Published:2021-03-29
Contact: CAO Yuliang, CHEN Zhongxue, ZHONG Faping E-mail:ylcao@whu.edu.cn;zxchen_pmc@whu.edu.cn;zfp@corun.com
Supported by:
This work was support by the Regional Innovation and Development Joint Fund, China(No.U20A20249), the National Natural Science Foundation of China(No.21972108) and the National Key Research Program of China(No. 2016YFB0100200).

Abstract

Abstract: Sodium-ion batteries(SIBs) are promising for grid-scale energy storage applications due to the natural abundance and low cost of sodium. Among various Na insertion cathode materials, Na_0.44MnO₂ has attracted the most attention because of its cost effectiveness and structural stability. However, the low initial charge capacity for Na-poor Na_0.44MnO₂ hinders its practical applications. Herein, we developed a facile chemical presodiated method using sodiated biphenly to transform Na-poor Na_0.44MnO₂ into Na-rich Na_0.66MnO₂. After presodiation, the initial charge capacity of Na_0.44MnO₂ is greatly enhanced from 56.5 mA·h/g to 115.7 mA·h/g at 0.1 C(1 C=121 mA/g) and the excellent cycling stability(the capacity retention of 94.1% over 200 cycles at 2 C) is achieved. This presodiation strategy would open a new avenue for promoting the practical applications of Na-poor cathode materials in sodium-ion batteries.

Key words: Sodium-ion battery, Na_0.44MnO₂, Chemical presodiation, Sodium biphenyl, Initial charge capacity

ZHOU Xi, LAI Yangyang, WU Xiangjiang, CHEN Zhongxue, ZHONG Faping, AI Xinping, YANG Hanxi, CAO Yuliang. Improved Initial Charging Capacity of Na-poor Na_0.44MnO₂ via Chemical Presodiation Strategy for Low-cost Sodium-ion Batteries[J]. Chemical Research in Chinese Universities, 2021, 37(2): 274-279.

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Improved Initial Charging Capacity of Na-poor Na_0.44MnO₂ via Chemical Presodiation Strategy for Low-cost Sodium-ion Batteries

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