Zhao Bing, Song Daiyun, Ding Yanwei, Wu Juan, Wang Zhixuan, Chen Zhiwen, Jiang Yong, Zhang Jiujun
School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai 200444, China.
Nanoscale. 2020 Feb 14;12(6):3941-3949. doi: 10.1039/c9nr10608a. Epub 2020 Feb 3.
As an anode electrode material for lithium-ion batteries, SnS has high specific capacity and has received widespread attention, but its practical application is still hindered by the low reversibility of the conversion reaction and the large irreversible capacity caused by the solid electrolyte interphase (SEI). In this paper, SnS nanoparticles are encapsulated into a sulfur-doped graphene bubble film (SnS@G) by a scalable electrostatic self-assembly of SnS/graphene oxide and hexadecyl trimethyl ammonium bromide, followed by the thermal decomposition of SnS and sulfur doping in graphene. Due to electrostatic attraction, the SnS nanoparticles are tightly wrapped in multilayer graphene sheets to form a flake-graphite-like structure. Compared with the disordered stacked SnS/graphene sheet composite, the closely packed SnS@G shows a much lower specific surface area and smaller irreversible Li consumption and surface film resistance after lithiation. The SnS@G composite anode exhibits great initial coulombic efficiency (83.2%), which is the highest value among the chemically synthesized SnS anodes. It also presents unprecedented cycling stability (1462 mA h g after 200 cycles at 0.1 A g and 1020 mA h g after 500 cycles at 1 A g) and superior rate capabilities (750 mA h g at 5 A g) upon Li storage, which demonstrates its excellent electrochemical performance and great potential as a negative electrode material for lithium-ion batteries.
作为锂离子电池的阳极电极材料，SnS具有高比容量并受到广泛关注，但其实际应用仍受到转化反应低可逆性以及由固体电解质界面（SEI）导致的大不可逆容量的阻碍。本文通过将SnS/氧化石墨烯与十六烷基三甲基溴化铵进行可扩展的静电自组装，随后在石墨烯中进行SnS的热分解和硫掺杂，将SnS纳米颗粒封装到硫掺杂的石墨烯气泡膜（SnS@G）中。由于静电吸引，SnS纳米颗粒被紧密包裹在多层石墨烯片中，形成类似片状石墨的结构。与无序堆叠的SnS/石墨烯片复合材料相比，紧密堆积的SnS@G在锂化后具有更低的比表面积、更小的不可逆锂消耗和表面膜电阻。SnS@G复合阳极表现出很高的初始库仑效率（83.2%），这是化学合成的SnS阳极中的最高值。在锂存储时，它还呈现出前所未有的循环稳定性（在0.1 A g下循环200次后为1462 mA h g，在1 A g下循环500次后为1020 mA h g）和优异的倍率性能（在5 A g下为750 mA h g），这证明了其优异的电化学性能以及作为锂离子电池负极材料的巨大潜力。
