材料科学
阳极
碳化
电化学
化学工程
碳纤维
涂层
纳米-
纳米颗粒
碱性电池
多孔性
电极
纳米技术
复合材料
扫描电子显微镜
电解质
化学
物理化学
工程类
复合数
作者
Ke Peng,Zhijian Zhang,Zejun Zhao,Chao Yang,Zhongliang Tian,Yanqing Lai
标识
DOI:10.1016/s1003-6326(19)65121-6
摘要
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 ([email protected]) was synthesized by one-step heat treatment from a gel precursor in N2. Commercial ZnO and homemade ZnO prepared similarly in air atmosphere were studied for comparison. Structure analysis displayed that both [email protected] 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 [email protected] 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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