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An enabling strategy for ultra-fast lithium storage derived from micro-flower-structured NiX (X=O, S, Se)
Electrochimica Acta ( IF 5.5 ) Pub Date : 2020-03-29 , DOI: 10.1016/j.electacta.2020.136138
Lei Wang , Zehua Wang , Lingling Xie , Limin Zhu , Xiaoyu Cao

Transition metal oxides/sulfides/selenides (TMOSS), regarded as three of the most potential anode materials for lithium-ion batteries (LIBs), are superior to their low cost, controllable morphology and high theoretical capacity. Herein, a facile strategy, using Ni-MOF material as precursor, was designed to fabricate the unique micro-flowerfig-like NiO, NiS/C and NiSe/C electrodes, including the detailed investigation about their electrochemical and kinetics properties. The results show that sizes of NiO, NiS/C and NiSe/C micro-flowers are around 0.7, 3.5 and 2.0 μm, respectively, which contains abundant micro- and meso-pores. Among them, NiSe/C material exhibits better electrochemical performance when used as anode for LIBs,with high initial capacity (1688.4 mAh g−1 at 0.1 A g−1) and high reversible capacity (1016.5 mAh g−1 at 1.0 A g−1 after 1000 cycles). Moreover, the full-cell, NiSe/C vs. LiCoO2, exhibits superior reversible discharge capacities of 421.8 mAh g−1 at 0.1 A g−1 after 50 cycles. It is important that the bond energy of Ni–Se contributes to improving NiSe/C electrochemical performance. This work shows the influence of Li+ insertion and pseudocapacitance behavior on lithium storage performance of TMOSS anode materials, which provides an effective strategy for research and development of TMOSS on LIBs.



中文翻译:

源自微花结构NiX(X = O,S,Se)的超快速锂存储的可行策略

过渡金属氧化物/硫化物/硒化物(TMOSS)被认为是锂离子电池(LIB)最具潜力的三种阳极材料,其价格低廉,形态可控且理论容量高。本文中,设计了一种以Ni-MOF材料为前体的简便策略,以制造独特的微花状NiO,NiS / C和NiSe / C电极,包括对其电化学和动力学性质的详细研究。结果表明,NiO,NiS / C和NiSe / C微花的大小分别约为0.7、3.5和2.0μm,其中包含大量的微孔和中孔。其中,NISE / C材料显示出更好的电化学性能时用作阳极LIBS,具有高初始容量(1688.4毫安克-1在0.1 A克-1)和高可逆容量(1000个循环后,在1.0 A g -1下为1016.5 mAh g -1)。此外,全电池NiSe / C。LiCoO 2在50个循环后,在0.1 A g -1下表现出421.8 mAh g -1的优异可逆放电容量。Ni-Se的键能有助于改善NiSe / C的电化学性能,这一点很重要。这项工作表明了Li +的插入和伪电容行为对TMOSS负极材料锂存储性能的影响,这为研究和开发TMOSS在LIB上提供了有效的策略。

更新日期:2020-03-30
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