Jiang Heng, Zhang Jie, Zeng Yibo, Chen Yanli, Guo Hang, Li Lei, Chen Xin, Zhang Ying
College of Materials, Xiamen University, Xiamen, Fujian 361005, People's Republic of China.
Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, Fujian 361005, People's Republic of China.
Nanotechnology. 2021 Nov 18;33(6). doi: 10.1088/1361-6528/ac3540.
Metal sulfides are promising anode materials for lithium ion batteries because of the high specific capacities and better electrochemical kinetics comparing to their oxide counterparts. In this paper, novel monocrystalline wurtzite ZnS@N-doped carbon (ZnS@N-C) nanoplates, whose morphology and phase are different from the common ZnS particles with cubic phase, are successfully synthesized. The ZnS@N-C nanoplates exhibit long cycle life with a high reversible specific capacity of 536.8 mAh · gafter 500 cycles at a current density of 500 mA · g, which is superior to the pure ZnS nanoplates, illustrating the obvious effect of the N-doped carbon coating for mitigating volume change of the ZnS nanoplates and enhancing the electronic conductivity during charge/discharge processes. Furthermore, it is revealed that the ZnS single crystals with wurtzite phase in the ZnS@N-C nanoplates are transformed to the polycrystalline cubic phase ZnS after charge/discharge processes. In particular, the ZnS@N-C nanoplates are combined with the commercial LiNiCoMnOcathode to fabricate a new type of LiNiCoMnO/ZnS@N-C complete battery, which exhibits good cycling durability up to 120 cycles at a charge/discharge rate of 1 C after the prelithiation treatment on the ZnS@N-C anode, highlighting the potential of the ZnS@N-C nanoplates anode material applied in lithium ion battery.
金属硫化物因其具有高比容量以及与氧化物对应物相比更好的电化学动力学，是很有前景的锂离子电池负极材料。本文成功合成了新型单晶纤锌矿型ZnS@N掺杂碳（ZnS@N-C）纳米片，其形貌和相不同于常见的立方相ZnS颗粒。ZnS@N-C纳米片在500 mA·g的电流密度下经过500次循环后表现出长循环寿命，具有536.8 mAh·g的高可逆比容量，优于纯ZnS纳米片，这说明了N掺杂碳涂层对于减轻ZnS纳米片的体积变化以及提高充放电过程中的电子导电性具有明显效果。此外，研究发现ZnS@N-C纳米片中的纤锌矿相ZnS单晶在充放电过程后转变为多晶立方相ZnS。特别地，将ZnS@N-C纳米片与商用LiNiCoMnO正极结合，制备了一种新型的LiNiCoMnO/ZnS@N-C全电池，在对ZnS@N-C负极进行预锂化处理后，该电池在1 C的充放电速率下表现出良好的循环耐久性，高达120次循环，突出了ZnS@N-C纳米片负极材料应用于锂离子电池的潜力。
