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Manipulating the Crystalline Structure and Electrochemical Performance of a Dilithium Manganese Silicate Cathode Material by Polyanion Doping
Author(s) -
Ji Ran,
Ding Zhengping,
Zhao Ying,
Ma Cheng,
Zeng Xiaohui,
Chen Libao,
Ivey Douglas G.,
Wei Weifeng
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600434
Subject(s) - dilithium , materials science , orthorhombic crystal system , cathode , electrochemistry , manganese , doping , structural stability , silicate , conductivity , lithium (medication) , chemical engineering , crystal structure , ion , crystallography , chemistry , electrode , metallurgy , optoelectronics , medicine , deprotonation , organic chemistry , structural engineering , engineering , endocrinology
As a promising candidate for lithium‐ion battery cathodes, dilithium manganese silicate (Li 2 MnSiO 4 ) has high theoretical capacity (333 mA h g −1 ) and compatible working potentials resulting in high energy density. However, the material suffers from low electronic conductivity and severe capacity loss as a result of structural instability during charge and discharge. Herein, a strategy to manipulate crystalline structure through incorporating boracic polyanions into the lattice of Li 2 MnSiO 4 is presented to achieve preferential growth of an orthorhombic Pmn 2 1 structure, which has proven difficult to achieve through traditional synthesis methods. The modified cathode material exhibits improved cycling stability and excellent rate capability. The excellent electrochemical performance is due to the higher structural consistency, the pillar effect of the boracic polyanions and enlarged Li + pathways in the structure.