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Zeolitic imidazolate framework-8 modified LiNi1/3Co1/3Mn1/3O2: A durable cathode showing excellent electrochemical performances in Li-ion batteries
Electrochimica Acta ( IF 5.5 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.electacta.2020.135724
Baoyun Li , Guangshe Li , Dan Zhang , Jianming Fan , Dandan Chen , Xiaoqing Liu , Tao Feng , Liping Li

Surface coating is a useful strategy to enhance the cycling stability of cathode materials. Achieving superior rate capability at the same time, however, is still a challenge. In this work, the zeolitic imidazolate framework-8 (ZIF-8), one of metal-organic framework material, is initially coated on the surface of LiNi1/3Co1/3Mn1/3O2 (NCM333). After ZIF-8 coating, the cycling stability and rate capability of NCM333@ZIF-8 are simultaneously improved in comparison with that of NCM333. A high capacity retention ratio of 81.4% is achieved after 300 cycles at 800 mA g−1, which is much larger than that of NCM333 (41.2%). Even at an elevated temperature (55 °C), the cycling stability of NCM333@ZIF-8 is still excellent. In addition, a high capacity of 122 mA h g−1 is obtained at a high current density of 1200 mA g−1. The enhanced performances are highly related with the unique properties of permanent porosity, exceptional thermal and chemical stability and the high ionic conductivity (3.16 × 10−4 S cm−1) of ZIF-8 that not only acts as a shield for NCM333 against the electrolyte corrosion, but also enables faster lithium-ion transfer at the interfacial regions. The current work offers guidance for improving the overall electrochemical performance of electrode materials in lithium-ion batteries.



中文翻译:

沸石咪唑酸盐骨架8改性的LiNi 1/3 Co 1/3 Mn 1/3 O 2:一种耐用的阴极,在锂离子电池中表现出出色的电化学性能

表面涂层是增强阴极材料循环稳定性的有用策略。然而,同时实现卓越的速率能力仍然是一个挑战。在这项工作中,将沸石-咪唑骨架8(ZIF-8)(一种金属有机骨架材料)首先涂覆在LiNi 1/3 Co 1/3 Mn 1/3 O 2(NCM 333)的表面上。ZIF-8涂布后,NCM的循环稳定性和倍率性能333 @ ZIF-8在与该NCM的比较同时也能改善333。在800 mA g -1下进行300次循环后,可实现81.4%的高容量保持率,这比NCM 333的容量保持率大得多(41.2%)。即使在高温(55°C)下,NCM 333 @ ZIF-8的循环稳定性仍然非常出色。此外,122毫安ħg的高容量-1是在1200毫安g的高电流密度下得到的-1。增强的性能与永久孔隙率,卓越的热稳定性和化学稳定性以及ZIF-8的高离子电导率(3.16×10 -4  S cm -1)的独特性能高度相关,ZIF-8不仅可作为NCM 333的屏蔽不仅可以防止电解质腐蚀,还可以在界面区域更快地转移锂离子。当前的工作为改善锂离子电池中电极材料的整体电化学性能提供了指导。

更新日期:2020-01-17
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