Journal
DALTON TRANSACTIONS
Volume 45, Issue 23, Pages 9669-9675Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt01764a
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Funding
- Jiangsu Province Prospective Joint Research on Pilot Project [BY2013072-03]
- Grant for State Key Program for Basic Research of China [2013CB632702, 2012CB921503]
- National Natural Science Foundation of China [11134006]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- National Laboratory of Solid State Microstructures, Test Foundation of Nanjing University
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LiNi0.6Co0.2Mn0.2O2 cathode material has been surface-modified by coating with ultrathin TiO2 via atomic Layer deposition (ALD) technology to improve the electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathodes for lithium ion batteries. Within the cut-off voltage of 2.5-4.3 V, the coated sample delivers an initial discharge capacity of 187.7 mA h g(-1) at 0.1 C and with a capacity retention about 85.9% after 100 cycles at 1 C, which provides a significant improvement in terms of discharge capacity and cyclability, as compared with those of the bare one. Such enhanced electrochemical performance of the coated sample is ascribed to its high-quality ultrathin coating of amorphous TiO2, which can protect the active material from HF attack, withstand the dissolution of metal ions in the electrode and favor the lithium diffusion of oxide as proved by electrochemical impedance spectroscopy (EIS) tests. TiO2 coating via the ALD process provides a potential approach for battery factories to surface-modify Ni-rich electrode materials so as to realize improvements in electrochemical performance.
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