Design of surface protective layer of LiF/FeF3 nanoparticles in Li-rich cathode for high-capacity Li-ion batteries
Design of surface protective layer of LiF/FeF3 nanoparticles in Li-rich cathode for high-capacity Li-ion batteries
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DOI：
10.1016/j.nanoen.2015.04.013
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发表时间：
2015-07
期刊：
影响因子：
17.6
通讯作者：
Taolin Zhao;Li Li-Li;Renjie Chen;Huimin Wu;Xiaoxiao Zhang;Shi Chen;Man Xie;Feng Wu;Jun Lu
中科院分区：
文献类型：
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作者：
Taolin Zhao;Li Li-Li;Renjie Chen;Huimin Wu;Xiaoxiao Zhang;Shi Chen;Man Xie;Feng Wu;Jun Lu
近年来，用于可再生能源存储应用的先进锂离子电池已成为主要的研究兴趣。通过材料表面设计的改进，特别是阴极材料的改进，可以实现更好的性能。在这里，我们提出了一种新的设计，通过一个简单的水溶液过程中，LiF/FeF 3的纳米结构层外延生长在散装分层锂丰富的阴极Li[Li0.2Ni0.2Mn0.6]O2形成的表面保护层。该材料在2-4.8 V电压范围内的纽扣电池测试表明具有高可逆容量（0.1 C时为260.1 mA h g− 1）、优异的上级倍率性能（20 C时为129.9 mA h g− 1）和优异的容量保持率。差示扫描量热法显示了良好的热稳定性。LiF/FeF 3表面保护层的引入抑制了界面副反应和转化反应，提高了电池的容量和循环稳定性。
Advanced lithium-ion batteries for renewable energy storage applications have become a major research interest in recent years. Much better performance can be realized by improvements in the material surface design, especially for the cathode materials. Here, we present a new design for a surface protective layer formed via a facile aqueous solution process in which a nano-architectured layer of LiF/FeF3is epitaxially grown on bulk hierarchical Li-rich cathode Li[Li0.2Ni0.2Mn0.6]O2. Coin cell tests of this material in the voltage range of 2–4.8 V indicated a high reversible capacity (260.1 mA h g−1at 0.1 C), superior rate performance (129.9 mA h g−1at 20 C), and excellent capacity retention. Differential scanning calorimetry showed good thermal stability. The enhanced capacity and cycling stability are attributed to the suppression of interfacial side reactions as well as the conversion reaction resulting from the introduction of LiF/FeF3as a surface protective layer.