期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 29, 期 10, 页码 2151-2159出版社
ELSEVIER
DOI: 10.1016/S1003-6326(19)65121-6
关键词
carbon-coated nano-ZnO; sol-gel method; porous hierarchical architecture; Zn-Ni battery
资金
- National Natural Science Foundation of China [51674301]
Although carbon coating can improve the cycle life of anode for alkaline Zn batteries, the specific capacity reported is still lower compared with nanosized ZnO. Herein, carbon-coated nanosized ZnO (nano-ZnO@C) was synthesized by one-step heat treatment from a gel precursor in N-2. Commercial ZnO and homemade ZnO prepared similarly in air atmosphere were studied for comparison. Structure analysis displayed that both nano-ZnO@C and homemade ZnO had a porous hierarchical agglomerated architecture produced from primary nanoparticles with a diameter of approximately 100 nm as building blocks. Electrochemical performance measurements showed that nano-ZnO@C displayed the highest electrochemical activity, the lowest electrode resistance, the highest discharge capacity (622 mA.h/g), and the best cyclic stability. These properties were due to the combination of nanosized ZnO and the physical capping of carbon, which maintained the high utilization efficiency of nano-ZnO, and simultaneously prevented dendrite growth and densification of the anode.
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