High potential performance of Cerium-doped LiNi0.5Co0.2Mn0.3O2 cathode material for Li-ion battery

To enhance the electrochemistry performance of LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM-523) cathode material, especially at high rate and high potential charge–discharge, Cerium has been used to dope into the material. Cerium-doped NCM-523 exhibits significantly better rate capability and excellent cycling...

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Bibliographic Details
Published inJournal of materials science Vol. 50; no. 7; pp. 2914 - 2920
Main Authors Xia, Li, Qiu, Kehui, Gao, Yuyan, He, Xia, Zhou, Fangdong
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.04.2015
Springer Nature B.V
Subjects
Cathodes
Cerium
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystal lattices
Crystal structure
Crystallography and Scattering Methods
Discharge
Doping
Electrochemistry
Electrode materials
Ion diffusion
Lithium-ion batteries
Materials Science
Original Paper
Performance enhancement
Polymer Sciences
Solid Mechanics
Rate Capability
Cerium
Coulomb Efficiency
Cathode Material
LiFePO4
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Summary:To enhance the electrochemistry performance of LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM-523) cathode material, especially at high rate and high potential charge–discharge, Cerium has been used to dope into the material. Cerium-doped NCM-523 exhibits significantly better rate capability and excellent cycling stability than the pristine material both at conventional potential of 4.25 V and high potential of 4.5 V. Electrochemical tests show that Cerium-doped NCM-523 discharged a 2.56 times higher capacity than pristine sample at 5 C when charged to 4.5 V, versus 1.94 times at 4.25 V. Pristine NCM-532 exhibits the capacity retention of 93.28 and 90.90 % at 1 C after 30 cycles for 4.25 and 4.5 V, respectively. After doping with Cerium, the capacity retention is increased to 96.77 and 97.35 % after cycles. XRD results show that Cerium is successfully doped into LiNi 0.5 Co 0.2 Mn 0.3 O 2 crystal lattice. Such enhanced performance of material should be ascribed to Cerium doping, which stabilizes the layered crystal structure, reduces the dissolution degree of cation in the electrode and improves the lithium-ion diffusion of the oxide proved by the EIS tests.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-015-8856-9