Assembly of Na3V2(PO4)2F3@C nanoparticles in reduced graphene oxide enabling superior Na+ storage for symmetric sodium batteries

Ye Yao; Lu Zhang; Yu Gao; Gang Chen; Chunzhong Wang; Fei Du

doi:10.1039/c7ra13441j

Assembly of Na₃V₂(PO₄)₂F₃@C nanoparticles in reduced graphene oxide enabling superior Na⁺ storage for symmetric sodium batteries

RSC Adv. 2018 Jan 15;8(6):2958-2962. doi: 10.1039/c7ra13441j. eCollection 2018 Jan 12.

Authors

Ye Yao¹, Lu Zhang¹, Yu Gao¹, Gang Chen¹, Chunzhong Wang¹, Fei Du¹

Affiliation

¹ Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) State Key Laboratory of Superhard Materials, College of Physics, Jilin University China dufei@jlu.edu.cn gaoyu@jlu.edu.cn.

Abstract

Reduced graphene oxide (rGO) was used to encapsulate Na₃V₂(PO₄)₂F₃@Carbon nanoparticles to overcome its inherent low electronic conductivity and achieve superior sodium storage performance. This as-prepared cathode delivers a remarkable rate performance with a discharge capacity of ca. 64 mA h g^-1 at 70C and an ultra-long-term cyclability over 4000 cycles with great capacity retention of 81% at 30C. This excellent performance can be attributed to the favorable combination of fast ionic conductivity of the NASICON structure and the interpenetrating conductive carbon framework; thus bringing a good pseudocapacitive quality to this material. Furthermore, thanks to the good sodium storage properties at low potential, a symmetric full cell can be assembled using Na₃V₂(PO₄)₂F₃@C@rGO as both cathode and anode. The full cell delivers a high discharge capacity of 53 mA h g^-1 at 20C rate, further demonstrating the feasibility of this hybrid material for smart grids.