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Suppressing the Voltage Decay and Enhancing the Electrochemical Performance of Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 by Multifunctional Nb 2 O 5 Coating
Author(s) -
Pan Wei,
Peng Wenjie,
Yan Guochun,
Guo Huajun,
Wang Zhixing,
Li Xinhai,
Gui Weihua,
Wang Jiexi,
Chen Ning
Publication year - 2018
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800253
Subject(s) - electrochemistry , materials science , cathode , electrolyte , coating , lithium (medication) , diffusion , anode , ion , analytical chemistry (journal) , chemical engineering , electrode , nanotechnology , chemistry , medicine , physics , organic chemistry , chromatography , endocrinology , engineering , thermodynamics
This study focuses on suppressing the voltage decay and improving the electrochemical performance of Li‐rich and manganese‐based (LRM) material by Nb 2 O 5 coating, which is realized by an effective soft‐chemical route using a mixture of ethanol and water as co‐solvent. After Nb 2 O 5 coating, the resulted material demonstrates superior electrochemical performance as cathode material for LIBs. Particularly, it shows an excellent capacity retention of 98 % after 200 cycles at 1 C (1 C=250 mA g −1 ). Voltage decay within cycling is also obviously suppressed by Nb 2 O 5 coating. Moreover, it exhibits superior rate capacities, delivering 189 and 152 mAh g −1 at high current densities of 2 and 5 C, respectively. The improved electrochemical performance of Nb 2 O 5 coated sample can be attributed to that Nb 2 O 5 can suppress the phase transformation and voltage decay by acting as not only a fast ion conductor to accelerate the lithium ion diffusion at the cathode/electrolyte interface, but also an inert protective layer to reduce the direct contact between the cathode and electrolyte.