CoAl-layered double hydroxide nanosheets-coated spherical nickel hydroxide cathode materials with enhanced high-rate and cycling performance for alkaline nickel-based secondary batteries
CoAl-layered double hydroxide nanosheets-coated spherical nickel hydroxide cathode materials with enhanced high-rate and cycling performance for alkaline nickel-based secondary batteries
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CoAl层状双氢氧化物纳米片包覆球形氢氧化镍正极材料，提高碱性镍基二次电池的高倍率和循环性能
DOI：
10.1016/j.electacta.2019.135198
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发表时间：
2020
影响因子：
6.6
通讯作者：
Li Jing
中科院分区：
文献类型：
--
作者：
Shangguan Enbo;Zhang Huijie;Wu Chengke;Cai Xiaowu;Wang Zhenhui;Wang Mingyu;Li Liangsheng;Wang Gongke;Li Quanmin;Li Jing
采用水热法成功制备了一系列Co-Al层状双氢氧化物纳米片包覆球形氢氧化镍，提高了其高倍率性能和循环性能。扫描电子显微镜图像显示Co-Al层状双氢氧化物均匀地锚定在氢氧化镍表面。Ni（OH）2@Co-Al层状双氢氧化物（10%）作为镍基电池的正极材料，表现出最高的高倍率性能和循环性能。所得Ni（OH）2@Co-Al LDH（10%）在0.2、1.0、5.0和10.0C下的放电容量分别达到299.7、276.6、247.5和223.2 mA h g− 1。在1C/1C下500次循环后，Ni（OH）2@Co-Al LDH（10wt%）提供了87.3%的高容量保持率。这些性能的改善归因于Co-Al层状双氢氧化物不仅形成了稳定的高导电层β-CoOOH和γ-CoOOH，而且通过γ-CoOOH和CoAl LDHs之间的可逆转化提供了许多容量，最终导致Ni（OH）2阴极的可逆性能、质子扩散和导电性的改善。因此，球形Ni（OH）2@Co-Al层状双氢氧化物（10%）是一种很有前途的新型镍基二次电池正极材料。
A series of Co–Al layered double hydroxide nanosheets-coated spherical nickel hydroxide with improved high-rate and cycling performance are successfully synthesized through a hydrothermal method. Scanning electron microscopy images show that Co–Al layered double hydroxide is uniformly anchored on the surface of nickel hydroxide. As cathode material for nickel-based battery, the Ni(OH)2@Co–Al layered double hydroxide(10%) displays a highest high-rate properties and cycling performance. The discharge capacities of the as-obtained Ni(OH)2@Co–Al LDH(10%) reach up to 299.7, 276.6, 247.5 and 223.2 mA h g−1at 0.2, 1.0, 5.0 and 10.0C, respectively. After 500 cycles at 1C/1C, the Ni(OH)2@Co–Al LDH (10wt%) delivers a high capacity retention of 87.3%. These performance improvements are ascribed to the fact that Co–Al layered double hydroxide not only forms a stable high conductive layer of β-CoOOH and γ-CoOOH, but also provides many capacity through a reversible conversion between and γ-CoOOH and CoAl LDHs, eventually leading to the improvement of the reversible property, proton diffusion and conductivity of the Ni(OH)2cathode. Consequently, the spherical Ni(OH)2@Co–Al layered double hydroxide(10%) is a promising cathodes material for advanced nickel-based secondary batteries.