A phytic acid derived LiMn0.5Fe0.5PO4/Carbon composite of high energy density for lithium rechargeable batteries

Yan Meng; Yujue Wang; Zhaokun Zhang; Xiaojuan Chen; Yong Guo; Dan Xiao

doi:10.1038/s41598-019-43140-7

A phytic acid derived LiMn_0.5Fe_0.5PO₄/Carbon composite of high energy density for lithium rechargeable batteries

Sci Rep. 2019 Apr 30;9(1):6665. doi: 10.1038/s41598-019-43140-7.

Authors

Yan Meng¹, Yujue Wang², Zhaokun Zhang³, Xiaojuan Chen¹, Yong Guo^{4

5}, Dan Xiao^{6

7

8}

Affiliations

¹ School of Chemical Engineering, Sichuan University, Chengdu, 610065, China.
² Institute of New Energy and Low-Carbon Technology (INELT), Sichuan University, Chengdu, 610207, China.
³ College of Chemistry, Sichuan University, Chengdu, 610064, China.
⁴ Institute of New Energy and Low-Carbon Technology (INELT), Sichuan University, Chengdu, 610207, China. guoy@scu.edu.cn.
⁵ College of Chemistry, Sichuan University, Chengdu, 610064, China. guoy@scu.edu.cn.
⁶ School of Chemical Engineering, Sichuan University, Chengdu, 610065, China. xiaodan@scu.edu.cn.
⁷ Institute of New Energy and Low-Carbon Technology (INELT), Sichuan University, Chengdu, 610207, China. xiaodan@scu.edu.cn.
⁸ College of Chemistry, Sichuan University, Chengdu, 610064, China. xiaodan@scu.edu.cn.

Abstract

A composite of olivine lithium manganese iron phosphate (LiMn_0.5Fe_0.5PO₄), external carbon coating and internal embedded carbon flakes, EC-IC-LMFP, is prepared by using phytic acid (PhyA) as phosphorus source via solvothermal process followed by calcination. The composite with improved electronic conductivity and ion diffusivity presents an ultrahigh reversible specific capacity of 193 mAh g^-1 at 0.1 C, and an excellent cycling stability of 93% capacity retention after 100 cycles at 1 C when applied as a cathode material for Li-ion batteries (LIBs). Additionally, the composite fine powders exhibit a special microstructure and its volumetric energy density is estimated to reach 1605 Wh L^-1, much larger than the commercial LiFePO₄.

Grants and funding

21777108/National Natural Science Foundation of China (National Science Foundation of China)