Citation: Yiming Dai, Qiujie Chen, Chenchen Hu, Yangyang Huang, Wangyan Wu, Mingliang Yu, Dan Sun, Wei Luo. Copper fluoride as a low-cost sodium-ion battery cathode with high capacity[J]. Chinese Chemical Letters, ;2022, 33(3): 1435-1438. doi: 10.1016/j.cclet.2021.08.050 shu

Copper fluoride as a low-cost sodium-ion battery cathode with high capacity

Yiming Dai ^a ,
Qiujie Chen ^{b, c} ,
Chenchen Hu ^a ,
Yangyang Huang ^a ,
Wangyan Wu ^a ,
Mingliang Yu ^a ,
Dan Sun ^{b, c, *,} ,
Wei Luo ^{a, **,}

a.
Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
b.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
c.
Haixi Institute, Xiamen Institute of Rare Earth Materials, Chinese Academy of Sciences, Xiamen 361021, China

^**

xmsundan@fjirsm.ac.cn

weiluo@tongji.edu.cn

Received Date: 4 July 2021
Revised Date: 3 August 2021
Accepted Date: 11 August 2021
Available Online: 17 August 2021

Figures(4)

Sodium-ion batteries (SIBs) are promising alternatives to lithium-ion batteries (LIBs) for large-scale energy storage considering the abundance and low cost of Na-containing resources. However, the energy density of SIBs has been limited by the typically low specific capacities of traditional intercalation-based cathodes. Metal fluorides, in contrast, can deliver much higher capacities based on multi-electron conversion reactions. Among metal fluorides, CuF₂ presents a theoretical specific capacity as high as 528 mAh/g while its Na-ion storage mechanism has been rarely reported. Here, we report CuF₂ as a SIB cathode, which delivers a high capacity of 502 mAh/g but suffers from poor electrochemical reversibility. As a solution, we adjust the cell configuration by inserting a carbon-coated separator, which hinders the transportation of dissolved Cu ions and improves the reversibility of the CuF₂ cathode. By using in-situ XRD measurements and theoretical calculation, we propose that a one-step conversion reaction occurs during the discharge process, and a reconversion reaction competes with the oxidization of Cu to dissolved Cu ion during the charge process.
- Sodium-ion battery,
- Copper fluoride,
- Cathode,
- Energy density,
- Conversion reaction
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