Free-standing MWCNTs/V 2 O 5 nanobelts composite architecture electrodes for lithium ion batteries (LIBs) are prepared based on hydrothermal method, electrostatic self-assembly approach and vacuum filtration deposition technique. Such kind of nanoarchitecture enhances the electrochemical kinetics and structural stability of V 2 O 5 cathodes. The distribution and evolution features of plane strains in free-standing MWCNTs/V 2 O 5 cathodes surface are in-operando monitored by using digital image correlation method and systematically discussed. The strain results show that the evolution of strain against potential obeys general Arrhenius relation under galvanostatic charge-discharge cycling. Considering the effect of lithium ion concentration, the elastic modulus of 20 wt% MWCNTs/V 2 O 5 electrode is confirmed via nanoindentation. The evolutions of average plane stresses in the free-standing MWCNTs/V 2 O 5 electrodes, as well as the contributions of mechanical and electrochemical components, are evaluated and discussed by mechano-electrochemical constitutive equation during electrochemical process. The analytical methods used in this article are universal for revealing the electrode mechano-electrochemical failure mechanism in LIBs. © 2019 Elsevier Ltd
Bibliographical noteThis work was supported by the National Natural Science Foundation of China (Grant Nos. 11572277, 11772287, 11802260), the Young and Middle-aged Scholar Training Program of Hunan Province Association for Science and Technology (2017TJ-Q02), the Hunan Natural Science Foundation of Hunan Province (No. 2018JJ3490) and the Hunan Provincial Innovation Foundation for Postgraduate (CX2016B256).
- Carbon nanotube
- Digital image correlation
- Lithium ion battery
- Mechano-electrochemical coupling
- Vanadium pentoxide