Inheritance of spherical morphology and optimization of assembled structures during preparation of LiMnPO(4) cathodes for high electrochemical properties.
Inheritance of spherical morphology and optimization of assembled structures during preparation of LiMnPO(4) cathodes for high electrochemical properties.
复制标题
制备 LiMnPO4 正极以实现高电化学性能时球形形态的继承和组装结构的优化
DOI：
10.1039/c8ra05832f
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发表时间：
2018-09-24
期刊：
影响因子：
3.9
通讯作者：
Liu, Yonghong
中科院分区：
文献类型：
--
作者：
Pan, Xiaoliang;Gao, Zhi;Liu, Lijun;Xiao, Fan;Xiao, Fen;Xie, Shikun;Liu, Yonghong
阴极的微球形结构有利于高振实密度和良好的循环稳定性，但由于电解质的低表面渗透性，它们的较差的倍率性能仍然是一个障碍。解决这一问题的有效策略是优化组装的微球结构。本文以Li3PO4为自牺牲模板，采用溶剂热法制备了（010）晶面完全暴露的LiMnPO4空心微球。在溶剂热反应过程中，通过简单地改变铵基盐，也制备了纳米棱柱随机组装和楔形径向组装微球。提出了一个合理的形成机制。当通过充放电测量来评价这三种微球时，它们的电化学性能高度依赖于组装结构的变化。特别是，具有径向排列的纳米棱镜的微球表现出高倍率性能，在1C和2C下的放电容量分别为125 mA h g−1和113 mA h g−1。这些结果源于微球的独特结构，其不仅由于径向孔通道而确保电解质快速渗透到壳的内部，而且由于其完全暴露的（010）面而确保Li+快速插入到纳米棱镜中。
Microspherical structures of cathodes facilitate high tap densities and good cycling stabilities, but their inferior rate capabilities due to low surface permeability for the electrolyte, remains a hurdle. An effective strategy to address this issue would be the optimization of the assembled microspheres structure. In this work, LiMnPO4 hollow microspheres assembled by radially aligned nanoprisms with fully exposed (010) facets are prepared by the solvothermal method using Li3PO4 as the self-sacrificed templates to improve the rate capability. By simply varying ammonium based salts during the solvothermal reaction, the nanoprisms-randomly assembled and the wedges-radially assembled microspheres are also fabricated. A plausible formation mechanism is carefully proposed. When the three kinds of microspheres are evaluated by charge/discharge measurements, their electrochemical properties are highly dependent on the variation of the assembled structures. In particular, microspheres with radially aligned nanoprisms exhibit high rate capabilities, delivering discharge capacities of 125 mA h g−1 at 1C and 113 mA h g−1 at 2C. These results originate from the unique structure of the microspheres, which not only ensures rapid electrolyte penetration to the interior of the shells due to the radial pore channels, but also guarantees fast Li+ insertion into the nanoprisms owing to their fully exposed (010) facets.
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