Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (5): 1467-1471.doi: 10.19799/j.cnki.2095-4239.2020.0118

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Engineering pseudocapacitive lithium storage based on ultra-fine SnS2-carbon3D microstructure

Xingang MA1(), Yuwei ZANG1, Lianke XIE1, Jianguang YIN1, Guoying ZHANG1, Rongchun MA2, Xianzheng YUAN2()   

  1. 1.State Grid Shandong Electric Power Research Institute, Ji‘nan 250002, Shandong, China
    2.School of Environmental Science and Engineering, Shandong University, Qingdao 266237, Shandong, China
  • Received:2020-03-25 Revised:2020-05-19 Online:2020-09-05 Published:2020-09-08
  • Contact: Xianzheng YUAN E-mail:qzmxg@sina.com;xzyuan@sdu.edu.cn

Abstract:

A nanostructured coating with conductive carbon is an effective way to improve the electrochemical performance of conversion-type materials. In this study, a three-dimensional porous sandwich-type structure constructed using interconnected two-dimensional N,P-co-doped carbon sheets with a composite of SnS2 nanoparticles embedded in a carbon matrix is proposed. The resulting unique porous structure with large specific surface and structural stability is capable of facilitating ion/electron transportation and providing more active sites to adsorb more Na+, while the ultra-fine SnS2 nanoparticles can accommodate the stress change accompanying the volume expansion and contribute to reducing the Na+ diffusion length. The composite electrode demonstrates superior stability, as well as an excellent rate capability. A kinetic analysis demonstrates enhanced surface pseudocapacitive behavior benefiting from the structural design and ultra-fine nanoparticles, which are the two main factors leading to its outstanding performance.

Key words: lithium ion batteries, anode, high performance, pseudocapacitive

CLC Number: