Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 829, Issue -, Pages 7-15Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.09.043
Keywords
Li-ion batteries; Cathode materials; Li-rich Mn-based material; Reconstruction; Irreversible capacity loss
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Funding
- National Basic Research Program of China (973 Program) [2014CB643406]
- National Science and Technology Support Program of China [2015BAB06B00]
- Hunan Provincial Science and Technology Plan Project, China [2016TP1007]
- collaborative Innovation Center of Manganese-Zinc Vanadium Industrial Technology (the 2011 plan of Hunan province)
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Bulk and surface reconstructed Li[Li0.2Mn0.54Ni0.13Co0.13]O-2 cathode materials induced by spinel embedment and gamma-MnO2 modification were synthesized by a one-step hydrothermal method. The results of XRD, XPS and SEM confirmed the introduction of gamma-MnO2. The analysis of XPS, TEM images, dQ/dV curves and CV curves demonstrated that a spinel phase is embedded synchronously in the bulk of layered structure during the process of gamma-MnO2 modification. The results of charge-discharge profiles and dQ/dV curves demonstrated the irreversible discharge capacity loss in the initial cycle is reduced with the introduction and collaboration of spinel and gamma-MnO2. Namely, the initial coulombic efficiency is improved up to approximately 100%. Furthermore, the specific discharge capacity and rate performances are enhanced by a structure breakthrough for Li+ transport through blending with electrochemical active spinel-phase and gamma-MnO2. In addition, the capacity retention of the material is enhanced from 64% up to 85% after 200 cycles. The main reasons are that the surface of Li[Li0.2Mn0.54Ni0.13Co0.13]O-2 is stabilized and the phase transformation from surface to bulk is mitigated under the protection of gamma-MnO2 coating layer.
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