title: Improved Cycle Stability and Rate Capability of Graphene Oxide Wrapped Tavorite LiFeSO₄F as Cathode Material for Lithium-Ion Batteries.
abstract: Tavorite LiFeSO4F has been regarded as a promising alternative to LiFePO4 due to its high Li ionic conductivity. To overcome the low electronic conductivity of LiFeSO4F, we prepared a graphene oxide (GO)/LiFeSO4F composite material by the solvothermal method. The GO wraps on the surface of LiFeSO4F and links the adjacent particles, thus providing an effective network for electrons transport. As a result, the electronic conductivity of the material is improved from 8.16 × 10(-11) S cm(-1) to 1.65 × 10(-4) S cm(-1). In addition, the GO depresses the side reactions of the electrode and electrolyte, promotes the charge transfer reactions at the electrode/electrolyte interface, and facilitates the lithium diffusion in the electrode. The GO-wrapped LiFeSO4F exhibits much better electrochemical performance than the pristine material. It showed a discharge capacity of 113.2 mAh g(-1) at the 0.1 C rate with 99% capacity retention after 100 cycles. In addition, the material is able to deliver 85.1, 73.4, and 30.3 mAh g(-1) at high current rates of 1 C, 2 C, and 10 C, respectively.
authors.forename: Zhendong
authors.initials: Z
authors.lastname: Guo
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.forename: Hailong
authors.initials: H
authors.lastname: Qiu
authors.forename: Tong
authors.initials: T
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Fu
authors.forename: Lijie
authors.initials: L
authors.lastname: Zhang
authors.affiliation: §CAS Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Yan
authors.forename: Xing
authors.initials: X
authors.lastname: Meng
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Yingjin
authors.initials: Y
authors.lastname: Wei
keywords: cathode material; electrochemical performance; graphene oxide; lithium ion batteries; lithium iron sulfate fluoride