Novel application of CoAl-layered double hydroxide/reduced graphene oxide nanocomposite as a highly efficient cathode additive for nickel-based secondary batteries
Novel application of CoAl-layered double hydroxide/reduced graphene oxide nanocomposite as a highly efficient cathode additive for nickel-based secondary batteries
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CoAl层状双氢氧化物/还原氧化石墨烯纳米复合材料作为镍基二次电池高效正极添加剂的新应用
DOI：
10.1016/j.electacta.2019.135242
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发表时间：
2020
影响因子：
6.6
通讯作者：
Shangguan Enbo
中科院分区：
文献类型：
--
作者：
Li Jing;Zhang Huijie;Wu Chengke;Cai Xiaowu;Wang Mingyu;Li Liangsheng;Li Quanmin;Chang Zhaorong;Shangguan Enbo
采用水热法合成了一系列Co-Al层状双氢氧化物（Co-Al LDHs）@还原氧化石墨烯（rGO）纳米复合材料，并首次将其作为新型镍基二次电池正极添加剂应用于镍基二次电池。所得Co-Al LDHs@rGO纳米复合材料由许多薄片纳米片组成，呈层状结构。比较了不同Co-Al LDHs@rGO对镍阴极性能的影响，并进一步探讨了其作用机理。有趣的是，与纯Ni（OH）2和Ni（OH）2+CoO电极相比，添加Co-Al LDHs@rGO（10%）的Ni（OH）2电极具有最佳的高倍率性能和更稳定的循环稳定性。Co-Al LDHs@rGO（10%）由于其柔软的结构，有利于通过形成更有效和稳定的导电网络来改善电极的电子电导率、质子扩散和电化学可逆性。特别是具有高电化学活性的Co-Al LDHs@rGO（10%）可以贡献比商业CoO高得多的放电容量。由于其高效率和低钴含量，Co-Al LDHs@rGO（10%）可以作为一种有效的，廉价的，和有前途的镍基二次电池的阴极添加剂。
A series of Co–Al layered double hydroxide (Co–Al LDHs)@reduced graphene oxide (rGO) nanocomposite are successfully synthesized through a hydrothermal method and applied as novel cathode additives for nickel-based secondary batteries for the first time. The obtained Co–Al LDHs@rGO nanocomposite is composed of many thin nanosheets, displaying laminated structure. The effects of various Co–Al LDHs@rGO on the properties of nickel cathodes were compared and its action mechanism was further investigated. Interestingly, the Ni(OH)2electrode added with Co–Al LDHs@rGO(10%) delivers best high-rate performances and more stable cycling stability as comparison with the pure Ni(OH)2and Ni(OH)2+CoO electrodes. Owing to its soft and flexible structure, Co–Al LDHs@rGO(10%) is conducive to modify the electronic conductivity, proton diffusion and electrochemical reversibility of the electrode by forming a more effective and stable conductive network. Especially, Co–Al LDHs@rGO(10%) with high electrochemical activity can contribute much higher discharge capacity than the commercial CoO. Owing to its high efficiency and low cobalt content, Co–Al LDHs@rGO(10%) can be applied as an effective, cheap, and promising cathode additive for nickel-based rechargeable batteries.