The Synthesis of LiMnxFe1-xPO₄/C Cathode Material through Solvothermal Jointed with Solid-State Reaction

Xiangming He; Jixian Wang; Zhongjia Dai; Li Wang; Guangyu Tian

doi:10.3390/ma9090766

The Synthesis of LiMn_xFe_1-xPO₄/C Cathode Material through Solvothermal Jointed with Solid-State Reaction

Materials (Basel). 2016 Sep 8;9(9):766. doi: 10.3390/ma9090766.

Authors

Xiangming He^{1

2}, Jixian Wang³, Zhongjia Dai⁴, Li Wang^{5

6}, Guangyu Tian⁷

Affiliations

¹ Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, China. hexm@tsinghua.edu.cn.
² State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China. hexm@tsinghua.edu.cn.
³ Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, China. wangjixian520@hotmail.com.
⁴ Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, China. daizj06@126.com.
⁵ Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, China. wang-l@tsinghua.edu.cn.
⁶ State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China. wang-l@tsinghua.edu.cn.
⁷ State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China. tian_gy@tsinghua.edu.cn.

Abstract

LiMn_xFe_1-xPO₄/C material has been synthesized through a facile solid-state reaction under the condition of carbon coating, using solvothermal-prepared LiMnPO₄ and LiFePO₄ as precursors and sucrose as a carbon resource. XRD and element distribution analysis reveal completed solid-state reaction of precursors. LiMn_xFe_1-xPO₄/C composites inherit the morphology of precursors after heat treatment without obvious agglomeration and size increase. LiMn_xFe_1-xPO₄ solid solution forms at low temperature around 350 °C, and Mn²⁺/Fe²⁺ diffuse completely within 1 h at 650 °C. The LiMn_xFe_1-xPO₄/C (x < 0.8) composite exhibits a high-discharge capacity of over 120 mAh·g^-1 (500 Wh·kg^-1) at low C-rates. This paves a way to synthesize the crystal-optimized LiMn_xFe_1-xPO₄/C materials for high performance Li-ion batteries.

Keywords: LiMnxFe1−xPO4; lithium ion batteries; solid-state reaction; solvothermal.