| High performances aqueous nickel-bismuth batteries assembled with highly crystalline Bi2O3 and CoNi-CoNiO2@NiCo layered double hydroxides heterostructure nanoarrays |
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Wei-Wei Kang1,2, Ze-Xu Ji1, Wen-Qing Zhang1, Hai-Tao Zeng2, Wei-Jie Guo1, Bing Xu1, Bao-Ping Lin3 |
1College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2College of Physics, Qingdao University, Qingdao 266071, Shandong, China
3School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, Jiangsu, China |
Correspondence:
Wei-Jie Guo,
Email: gwj900907@163.com
Bao-Ping Lin,
Email: lbp@seu.edu.cn
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Received: 11 August 2025 • Accepted: 14 December 2025 |
| Abstract |
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Bi2O3 as prospective anode active materials for aqueous rechargeable nickel-bismuth batteries, is confronted with limited capacity and cycling durability. Herein, highly crystalline Bi2O3 with a tousled, cookie-like microstructure was synthesized by calcining Bi2O2CO3 precursors. The as-prepared Bi2O3 delivers a remarkable specific capacity of 266.7 mAh/g at 2 A/g and 203.3 mAh/g at 20 A/g, while maintaining 62.6% of its initial capacity after 1900 cycles at 15 A/g. For the cathode, heterostructured nanoarrays consisting of CoNiO2 and Co-Ni alloy cores grown on nickel foam, coated with nickel-cobalt layered double hydroxide shells, exhibit excellent electrochemical performance, with specific capacities of 249.7 mAh/g at 1 A/g and 112.0 mAh/g at 20 A/g. The assembled aqueous nickel-bismuth battery achieves a maximum energy density of 34.8 Wh/kg and a power density of 4400.5 W/kg at 1 A/g. These outstanding energy storage properties are attributed to the synergistic effect of the highly crystalline, tousled Bi2O3 anode and the heterostructured nanoarray cathode. |
| Keywords:
Nickel-bismuth batteries, Bi2O3, High crystallinity, Heterostructure, Energy storage properties |
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