Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 45, Pages 39610-39617Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12155
Keywords
MXene; few layers; high-energy mechanical milling; DMSO; anode; sodium-ion batteries
Funding
- National Program on Key Basic Research Project of China [2014CB239701]
- National Natural Science Foundation of China [51372116, 51672128, 21773118]
- Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province [BY2015003-7]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Graduate Innovation Center in NUAA [kfjj20160601, kfjj20170607]
- Funding for Outstanding Doctoral Dissertation in NUAA [BCXJ14-12]
- Jiangsu Innovation Program for Graduate Education [KYLX_0254]
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The global availability of sodium makes the exploration of superior sodium-ion batteries attractive for energy storage application. MXenes, as one of the most promising anodes for sodium-ion batteries, have been reported to have many advantages, such as high electronic conductivity and a hydrophilic surface. However, the compact multilayer structure and deficient delamination significantly inhibits their application, requiring high energy and showing decreased storage capacity and poor rate capabilities. Few-layer MXene has been proved to benefit superior electrochemical properties with a better ionic conductivity and two-dimensional layer structure. Herein, we report scale delamination of few-layer MX enenanosheets as anodes for sodium-ion batteries, which are prepared via an organic solvent assist high-energy mechanical-milling method. This approach efficiently prevents the oxidation of MXene and produces few-layer nanosheets structure, facilitating fast electron transport and Na+ diffusion. Electrochemical tests demonstrate that the few-layer MXenes show high specific capacity, excellent cycle stability, and good rate performance. Specifically, few-layer MXene nanosheets deliver a high reversible capacity of 267 mA h(-1). at a current density of 0.1 A g(-1). After cycling 1500 cycles at a high rate of 1 A g(-1), a reversible capacity of 76 mA h g(-1) could be maintained.
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