Unraveling the Impact of Ether and Carbonate Electrolytes on the Solid-Electrolyte Interface and the Electrochemical Performances of ZnSe@C Core-Shell Composites as Anodes of Lithium-Ion Batteries
Unraveling the Impact of Ether and Carbonate Electrolytes on the Solid-Electrolyte Interface and the Electrochemical Performances of ZnSe@C Core-Shell Composites as Anodes of Lithium-Ion Batteries
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揭示醚和碳酸盐电解质对固体电解质界面的影响以及ZnSe@C核壳复合材料作为锂离子电池负极的电化学性能
DOI：
10.1021/acsami.8b21237
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发表时间：
2019
影响因子：
9.5
通讯作者：
Tian Yong
中科院分区：
文献类型：
--
作者：
Ma Dejun;Zhu Qiulan;Li Xintao;Gao Hongcheng;Wang Xiufang;Kang Xiongwu;Tian Yong
对电极材料和电解质之间的固体电解质界面（SEI）的认识限制了电极材料、电解质的选择，并且进一步限制了电池的电化学性能。本文报道了以ZIF-8为原料制备的ZnSe@C核壳纳米复合材料作为锂离子电池负极材料的电化学性能，以及在乙醚和碳酸盐电解液中在ZnSe@C上形成的SEI膜。结果表明，ZnSe@C在1A·g-1下，在乙醚电解液中循环800次后的可逆容量为617.1mA·h·g-1，远高于在碳酸盐电解液中的可逆容量。非原位X射线衍射和X射线光电子能谱分析表明，在醚类电解质中，ZnSe@C表面形成了稳定的SEI膜，而Se则参与了SEI膜的形成，并进一步溶解到碳酸盐电解质中，这是由于电解质的同时分解和Li+插入到ZnSe中，这使得ZnSe@C复合材料在醚类和碳酸盐电解质中的循环性能不同。
The recognition of the solid electrolyte interface (SEI) between the electrode materials and electrolyte is limiting the selection of electrode materials, electrolytes, and further the electrochemical performance of batteries. Herein, we report ZnSe@C core–shell nanocomposites derived from ZIF-8 as anode materials of lithium-ion batteries, the electrochemical performances, and SEI films formed on ZnSe@C in both ether and carbonate electrolytes. It is found that ZnSe@C delivers a reversible capacity of 617.1 mA h·g–1after 800 cycles at 1 A·g–1in the ether electrolyte, much higher than that in the carbonate electrolyte. Both ex situ X-ray diffraction and X-ray photoelectron spectroscopies reveal that stable SEI films are formed on ZnSe@C in the ether electrolyte while selenium is involved in the formation of SEI films and further dissolved into the carbonate electrolyte because of the concurrent decomposition of electrolytes and insertion of Li+into ZnSe, which differentiates between the cycling performances of ZnSe@C composites in ether and carbonate electrolytes.