Synthesis of Bi2S3/carbon nanocomposites as anode materials for lithium-ion batteries
Synthesis of Bi2S3/carbon nanocomposites as anode materials for lithium-ion batteries
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DOI：
10.1016/j.jmst.2020.01.045
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发表时间：
2020-08
影响因子：
10.9
通讯作者：
Jingyu Bai;Xiao Chen;E. Olsson;Huimin Wu;Shiquan Wang;Q. Cai;C. Feng
中科院分区：
文献类型：
--
作者：
Jingyu Bai;Xiao Chen;E. Olsson;Huimin Wu;Shiquan Wang;Q. Cai;C. Feng
硫化铋(Bi2S3)等金属硫化物具有较高的理论重量和体积容量，作为锂离子电池负极材料具有很大的推广潜力。然而，Bi2S3在循环过程中较差的导电性和体积膨胀阻碍了Bi2S3的实际应用。在本工作中，我们以吡咯和葡萄糖为碳源，在Bi2S3颗粒表面设计了表面碳涂层，以提高Bi2S3的结构稳定性。合成了两种复合材料--掺氮碳(Bi2S3@NC)包覆的Bi2S3和碳包覆的Bi2S3(Bi2S3@C)。当用作阳极活性材料时，Bi2S3@NC和Bi2S3@C都比Bi2S3有更好的性能，这证实了表面碳涂层是一种有效的、可扩展的Bi2S3材料改性方法。基于Bi2S3@C的电极表现出比Bi2S3@C更高的性能，首次放电容量为1126.5 mA h/g，循环稳定性良好(以200 mA/g循环200次后为500 mA h/g)，并具有优异的倍率性能。最后，用第一性原理密度泛函理论计算揭示了Li在Bi2S3中的储存和迁移机制。
Metal sulfides such as Bismuth sulfide (Bi2S3) hold immense potential to be promoted as anode materials for lithium-ion batteries (LIBs), owing to their high theoretical gravimetric and volumetric capacities. However, the poor electrical conductivity and volume expansion during cycling hinder the practical applications of Bi2S3. In this work, we used pyrrole and glucose as carbon source to design the surface carbon coating on the surface of Bi2S3particles, to improve the structural stability of Bi2S3. Two composite materials were synthesized – Bi2S3coated with nitrogen doped carbon (Bi2S3@NC), and Bi2S3coated with carbon (Bi2S3@C). When used as anode active materials, both Bi2S3@NC and Bi2S3@C showed improved performance compared to Bi2S3, which confirms surface carbon coating as an effective and scalable way for the modification of Bi2S3material. The electrode based on Bi2S3@NC materials demonstrated higher performance than that of Bi2S3@C, with an initial discharge capacity of 1126.5 mA h/g, good cycling stability (500 mA h/g after 200 cycles at 200 mA/g) and excellent rate capability. Finally, Li storage and migration mechanisms in Bi2S3are revealed using first principle density functional theory calculations.