More than just a protection layer: Inducing chemical interaction between Li3BO3 and LiNi0·5Mn1·5O4 to achieve stable high-rate cycling cathode materials
More than just a protection layer: Inducing chemical interaction between Li3BO3 and LiNi0·5Mn1·5O4 to achieve stable high-rate cycling cathode materials
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不仅仅是一个保护层：诱导Li3BO3和LiNi0·5Mn1·5O4之间的化学相互作用，以实现稳定的高倍率循环正极材料
DOI：
10.1016/j.electacta.2020.136074
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发表时间：
2020-05
影响因子：
6.6
通讯作者：
Gong Zhengliang
中科院分区：
文献类型：
--
作者：
Zhu Ruonan;Zhang Shaojian;Guo Qixun;Zhou Yao;Li Juntao;Wang Pengfei;Gong Zhengliang
Spinel LiNi0·5Mn1·5O4(LNMO), though being considered as a promising cathode material because of their high energy and power density, always suffers from rapid capacity deterioration due to the Jahn-Teller effect and severe leakage of Mn ions into electrolytes at elevated temperatures. In this work, Li3BO3(LBO) formed from slow hydrolysis of triethyl borate was coated on the surface of LiMn1·5Ni0·5O4materials prepared through a modified wet-chemistry method. Our results put an emphasis on the strong chemical interactions between the external LBO coating layer and the internal LNMO core induced by a high-temperature thermal treatment; owing to the favorable solid-solid interfacial interaction, the presence of the relatively oxidative Li3BO3layer was found to diminish the population of the oxygen vacancy and minimize the unstable Mn3+species in the LNMO active materials, which thus could alleviate the adverse Jahn-Teller distortion and enhance the structural stability. Moreover, as a coating layer, the LBO could prevent direct interaction between the cathode active materials and the electrolyte; as such, the etching of the LNMO cathode materials by the decomposition products of electrolytes such as HF and the leakage of active metal species were inhibited effectively. Besides, the LBO itself is a highly conductive ionic conductor, which thus could enable fast Li+cation diffusion on the cathode. On this basis, a significant improvement was observed in the high-rate cycling performance for thus coated LNMO cathode materials. The bare LNMO electrode failed within merely 300 cycles. In contrast, our optimal sample LBO2%@LNMO with 2 wt% of LBO delivers a high discharge specific capacity of 127 mAh g−1, which accounts for 92% of its initial capacity after 500 cycles at 1C in the range of 3.5–4.99 V; when cycling at 10 C, it displays an initial discharge specific capacity of 111 mAh g−1and maintains 85 mAh g−1after 1000 cycles. Our work demonstrates that in addition to behaving as a physical protection layer, the introduction of the ionic conductive Li3BO3coating layer could also modify the local composition of the spinel-type LNMO through strong interfacial chemical reaction, which thus could profoundly enhance the structural integrity and high-rate cycling stability.
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影响因子：
3.7
作者：
Yunxian Qian;Yuanfu Deng;Lina Wan;Hongjie Xu;Xusong Qin;Guohua Chen
通讯作者：
Yunxian Qian;Yuanfu Deng;Lina Wan;Hongjie Xu;Xusong Qin;Guohua Chen
影响因子：
3.2
作者：
Changmei Jiao;Li Wang;Yuxiang Zuo;Ping Ni;Guangchuan Liang
通讯作者：
Changmei Jiao;Li Wang;Yuxiang Zuo;Ping Ni;Guangchuan Liang
影响因子：
--
作者：
Li Wang;G. Liu;Wei Wu;Dan Chen;Guangchuan Liang
通讯作者：
Li Wang;G. Liu;Wei Wu;Dan Chen;Guangchuan Liang
非晶 FePO4 涂层改善 5 V 尖晶石 LiMn1.5Ni0.5O4 的循环性能
影响因子：
9.2
作者：
Liu, Dilong;Bai, Ying;Zhang, Weifeng
通讯作者：
Zhang, Weifeng
影响因子：
6.6
作者：
Brutti, Sergio;Greco, Giorgia;Panero, Stefania
通讯作者：
Panero, Stefania