One-step synthesis of uniformly distributed SiOx-C composites as stable anodes for lithium-ion batteries

Siyu Chen; Yanan Xu; Hongbin Du

doi:10.1039/d2dt01843h

One-step synthesis of uniformly distributed SiO_x-C composites as stable anodes for lithium-ion batteries

Dalton Trans. 2022 Aug 9;51(31):11909-11915. doi: 10.1039/d2dt01843h.

Authors

Siyu Chen¹, Yanan Xu¹, Hongbin Du¹

Affiliation

¹ State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China. hbdu@nju.edu.cn.

PMID: 35876179
DOI: 10.1039/d2dt01843h

Abstract

SiO_x is one of the most promising anode materials for lithium-ion batteries (LIBs), due to its high theoretical capacity and low cost. However, the huge volume expansion and low electron/ion diffusion rate hinder its further commercial applications. Herein, a simple molecular polymerization method is developed to synthesize N,P co-doped SiO_x-C composites (denoted as SiO_x-C@CNT), in which SiO_x and carbon are uniformly dispersed at the atomic level, and the embedded carbon nanotubes improve the lithium ion diffusion kinetics. Benefiting from the unique structure, the SiO_x-C@CNT composites exhibit a high reversible capacity of 848 mA h g^-1 at 0.1 A g^-1 and long cycling stability (84.0% capacity retention after 1500 cycles). More impressively, the LiCoO₂∥SiO_x-C@CNT full battery also exhibits stable cycle life (only 4.7% capacity loss after 300 cycles at 1 C). These results show the application potential of the SiO_x-C@CNT anode in LIBs.