Kinetics modulation of titanium niobium oxide via hierarchical MXene coating for high-rate and high-energy density lithium-ion half/full batteries

Kinetics modulation of titanium niobium oxide via hierarchical MXene coating for high-rate and high-energy density lithium-ion half/full batteries

[Display omitted] •TiNb2O7 coated with MXene showed superior kinetics.•The recombination of MXene improved the electrical conductivity of TiNb2O7.•Excellent rate performance and outstanding cyclic stability at high rate. Titanium niobium oxide has great potential in fast charging and discharging due...

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Bibliographic Details
Published in:Applied surface science Vol. 576; p. 151890
Main Authors: Sui, Yangyang, Guo, Jia, Li, Zhenghuai, Jiang, Fangming, Xia, Xiaotian, Geng, Hongbo, Liu, Quan, Wei, Bo, Zuo, Xiaobing
Format: Journal Article
Language:English
Published: Elsevier B.V 01-02-2022
Subjects:
Anode
Lithium ion batteries
MXene
TiNb2O7
Lithium ion batteries
TiNb2O7
Anode
MXene
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Summary:[Display omitted] •TiNb2O7 coated with MXene showed superior kinetics.•The recombination of MXene improved the electrical conductivity of TiNb2O7.•Excellent rate performance and outstanding cyclic stability at high rate. Titanium niobium oxide has great potential in fast charging and discharging due to the high capacity at large rate. But its poor capacity retention rate seriously restricts the further development. MXene, a two-dimensional transition metal carbide with high conductivity, was adopted to complex with TiNb2O7 (TNO) to improve the electrochemical performance. TNO coated with MXene exhibits better conductivity and limited volume expansion, which benefits the capacity and stability of TNO in the cycle process. The capacity of TNO@MXene remains 153 mAh g−1 after 2000 cycles at 10 C, and the capacity retention rate is 81.4%. The capacity of TNO@MXene can reach 145 mAh g−1 after 5000 cycles at 20 C, and the capacity retention rate is 77.1%. The full battery was assembled using commercial NCM811 as the cathode material, and its energy density was 241.7 Wh kg−1, further verifying its potential application.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2021.151890