阳极
材料科学
碳化
电解质
碳纤维
化学工程
电化学
电导率
离子
纳米技术
电极
复合材料
化学
扫描电子显微镜
有机化学
物理化学
复合数
工程类
作者
Xiaokang Xu,Yanmin Zhou,Hairui You,Huihua Min,X. Ben Wu,Weidong Zang,Junwei Hao,Zengkai Feng,Xiaomin Liu,Hui Ye
标识
DOI:10.1016/j.apsusc.2022.154758
摘要
As a potential anode alternative for Li-ion batteries (LIBs), NiS2 has the advantages of high theoretical capacity (873 mAh g−1), low cost, and good reversibility. However, the application of NiS2 is limited by poor conductivity, sluggish kinetics, and large volume variation. Herein, the hollow spherical NiS2/C-M, or nano-NiS2 embedded in graphitized carbon skeleton, is prepared through construction of the MOF template with hollow cavity, carbonization, and sulfurization. Compared to the aggregated NiS2/C-P particles, the NiS2/C-M composites have more BET surface area to provide more active sites and larger interface between electrolyte and the electrode, greater volume variation tolerance, improved ion and electron conductivity, less active material loss during cycling. As a result, NiS2/C-M exhibits high reversible capacity and excellent rate capability, 1064.2 and 508 mAh g−1 at 0.1 and 2 A g−1, respectively. NiS2/C-M can retain the capacity of 558 mAh g−1 even after 600 cycles at 1 A g−1. The redox mechanism is proposed that NiS2 can reversibly transform to Ni and Li2S via the LixNiS2 intermediate. The formation mechanism of hollow cavity in MOF is explicated to follow the Ostwald’s step rule. This feasible method to fabricate NiS2/C-M may provide a novel approach to develop high-capacity anode for LIBs.
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