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Title: A novel cathode material with concentration-gradient for high energy and safe lithium-ion batteries.

Abstract

A high-energy functional cathode material with an average composition of Li[Ni{sub 0.72}Co{sub 0.18}Mn{sub 0.10}]O{sub 2}, mainly comprising a core material Li[Ni{sub 0.8}Co{sub 0.2}]O{sub 2} encapsulated completely within a stable manganese-rich concentration-gradient shell is successfully synthesized by a co-precipitation process. The Li[Ni{sub 0.72}Co{sub 0.18}Mn{sub 0.10}]O{sub 2} with a concentration-gradient shell has a shell thickness of about 1 {micro}m and an outer shell composition rich in manganese, Li[Ni{sub 0.55}Co{sub 0.15}Mn{sub 0.30}]O{sub 2}. The core material can deliver a very high capacity of over 200 mA h g{sup -1}, while the manganese-rich concentration-gradient shell improves the cycling and thermal stability of the material. These improvements are caused by a gradual and continuous increase of the stable tetravalent Mn in the concentration-gradient shell layer. The electrochemical and thermal properties of this cathode material are found to be far superior to those of the core Li[Ni{sub 0.8}Co{sub 0.2}]O{sub 2} material alone. Electron microscopy also reveals that the original crystal structure of this material remains intact after cycling.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
EE
OSTI Identifier:
975463
Report Number(s):
ANL/CSE/JA-65441
Journal ID: ISSN 1616-301X; TRN: US201008%%303
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Adv. Funct. Mater.
Additional Journal Information:
Journal Volume: 20; Journal Issue: 3 ; Feb. 8, 2010; Journal ID: ISSN 1616-301X
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; CAPACITY; CATHODES; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; FUNCTIONALS; MANGANESE; STABILITY; THERMODYNAMIC PROPERTIES; THICKNESS

Citation Formats

Sun, Y -K, Kim, D -H, Yoon, C S, Myung, S -T, Prakash, J, Amine, K, Chemical Sciences and Engineering Division, Hanyang Univ., Iwate Univ., and Illinois Inst. of Tech. A novel cathode material with concentration-gradient for high energy and safe lithium-ion batteries.. United States: N. p., 2010. Web. doi:10.1002/adfm.200901730.
Sun, Y -K, Kim, D -H, Yoon, C S, Myung, S -T, Prakash, J, Amine, K, Chemical Sciences and Engineering Division, Hanyang Univ., Iwate Univ., & Illinois Inst. of Tech. A novel cathode material with concentration-gradient for high energy and safe lithium-ion batteries.. United States. doi:10.1002/adfm.200901730.
Sun, Y -K, Kim, D -H, Yoon, C S, Myung, S -T, Prakash, J, Amine, K, Chemical Sciences and Engineering Division, Hanyang Univ., Iwate Univ., and Illinois Inst. of Tech. Mon . "A novel cathode material with concentration-gradient for high energy and safe lithium-ion batteries.". United States. doi:10.1002/adfm.200901730.
@article{osti_975463,
title = {A novel cathode material with concentration-gradient for high energy and safe lithium-ion batteries.},
author = {Sun, Y -K and Kim, D -H and Yoon, C S and Myung, S -T and Prakash, J and Amine, K and Chemical Sciences and Engineering Division and Hanyang Univ. and Iwate Univ. and Illinois Inst. of Tech.},
abstractNote = {A high-energy functional cathode material with an average composition of Li[Ni{sub 0.72}Co{sub 0.18}Mn{sub 0.10}]O{sub 2}, mainly comprising a core material Li[Ni{sub 0.8}Co{sub 0.2}]O{sub 2} encapsulated completely within a stable manganese-rich concentration-gradient shell is successfully synthesized by a co-precipitation process. The Li[Ni{sub 0.72}Co{sub 0.18}Mn{sub 0.10}]O{sub 2} with a concentration-gradient shell has a shell thickness of about 1 {micro}m and an outer shell composition rich in manganese, Li[Ni{sub 0.55}Co{sub 0.15}Mn{sub 0.30}]O{sub 2}. The core material can deliver a very high capacity of over 200 mA h g{sup -1}, while the manganese-rich concentration-gradient shell improves the cycling and thermal stability of the material. These improvements are caused by a gradual and continuous increase of the stable tetravalent Mn in the concentration-gradient shell layer. The electrochemical and thermal properties of this cathode material are found to be far superior to those of the core Li[Ni{sub 0.8}Co{sub 0.2}]O{sub 2} material alone. Electron microscopy also reveals that the original crystal structure of this material remains intact after cycling.},
doi = {10.1002/adfm.200901730},
journal = {Adv. Funct. Mater.},
issn = {1616-301X},
number = 3 ; Feb. 8, 2010,
volume = 20,
place = {United States},
year = {2010},
month = {2}
}