期刊
APPLIED SURFACE SCIENCE
卷 576, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151890
关键词
TiNb2O7; MXene; Anode; Lithium ion batteries
类别
资金
- Natural Science Foundation of Jiangsu Province [BK20191030]
- Six Talent Peaks Project of Jiangsu Province [2018-SWYY-001]
- National Natural Science Foundation of China [51762014]
TiNb2O7 coated with MXene shows improved electrochemical performance and higher capacity retention rate at high rate. Assembling a full battery with commercial NCM811 as cathode material achieves a high energy density, indicating potential applications.
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.
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