Affiliation:
1. College of Chemistry Xiangtan University Xiangtan 411105 China
2. School of Science Hunan University of Technology and Business Changsha 410205 China
3. National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery National Base for International Science & Technology Cooperation Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education Xiangtan 411105 China
Abstract
AbstractThe intrinsically low electronic conductivity and slow ion diffusion kinetics limit further development of olivine LiFexMn1‐xPO4 cathode materials. In this paper, with the aim of improving the performance of such materials and alleviating the Jahn‐Taller effect of Mn3+ ion, a bimetallic oxalate precursor with gradient distribution of elemental concentration followed with an efficient process is applied to synthesize LiFe0.5Mn0.5PO4 nanocomposite. The results shown that with certain structural modulation of the precursor, the discharge capacity of synthesized LiFe0.5Mn0.5PO4 increased from 149 mAh g−1 to 156 mAh g−1 at 0.1 C, the cycling capacity was also remarkably improved. the Fe0.5Mn0.5C2O4 ⋅ 2H2O‐1 precursor with gradient distribution of elemental concentration effectively restricts the reaction between electrode material and electrolyte, thereby alleviates the dissolution of Mn3+ ion, reduces the decay of capacity and improves the stability of the material.
Funder
National Natural Science Foundation of China