PPy‐encapsulated SnS2 Nanosheets Stabilized by Defects on a TiO2 Support as a Durable Anode Material for Lithium‐Ion Batteries

作者：Dr. Ling Wu; Jie Zheng; Dr. Liang Wang; Prof. Xunhui Xiong; Yanyan Shao; Gang Wang; Prof. Jeng‐Han Wang; Prof. Shengkui Zhong; Prof. Minghong Wu

来源：Angewandte Chemie, 2019, 131(3): 821-825.

DOI：10.1002/ange.201811784

• Lithiumionenbatterien
• Sauerstoff-Fehlstellen
• Zyklenbest?ndigkeit

Nanostructured‐alloy‐type anodes have received great interest for high‐performance lithium‐ion batteries (LIBs). However, these anodes experience huge volume fluctuations during repeated lithiation/delithiation and are easily pulverized and subsequently form aggregates. Herein, an efficient method to stabilize alloy‐type anodes by creating defects on the surface of the metal oxide support is proposed. As a demonstration, PPy‐encapsulated SnS\u003csub\u003e2\u003c/sub\u003e nanosheets supported on defect‐rich TiO\u003csub\u003e2\u003c/sub\u003e nanotubes were produced and investigated as an anode material for LIBs. Both experimental results and theoretical calculations demonstrate that defect‐rich TiO\u003csub\u003e2\u003c/sub\u003e provides more chemical adhesions to SnS\u003csub\u003e2\u003c/sub\u003e and discharge products, compared to defect‐poor TiO\u003csub\u003e2\u003c/sub\u003e, and then effectively stabilizes the electrode structure. As a result, the composite exhibits an unprecedented cycle stability. This work paves the way to designing durable and active nanostructured‐alloy‐type anodes on oxide supports.

• 单位
  华南理工大学