Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 11, Pages 10199-10205Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b02178
Keywords
NaAlO2; Al2O3 coating; Ni-rich cathode material; Li+ diffusion coefficient; Interface stability
Categories
Funding
- National Basic Research Program of China [2014CB643406]
- National Natural Science Foundation of China [51704332]
- National Science-Technology Support Plan of China [2015BAB06B00]
- National Postdoctoral Program for Innovative Talents [BX201700290]
- Research Grants Council (RGC) of the Government of Hong Kong SAR [T21-711/16R, 17212015]
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Inspired by the metallurgical process of aluminum production, a controllable and cost-effective Al2O3 coating strategy is introduced to improve the surface stability of LiNi0.8Co0.1Mn0.1O2. The CO2 is introduced to NaAlO2 aqueous solution to generate a weak basic condition that is able to decrease the deposition rate of Al(OH)(3) and is beneficial to the uniform coating of Al(OH)(3) on the surface of commercial Ni0.8Co0.1Mn0.1(OH)(2) precursor. The electrochemical performance of Al2O3-coated LiNi0.8Co0.1Mn0.1O2 is improved at both ordinary cutoff voltage of 4.3 V and elevated cutoff voltage of 4.5 V. With the optimized Al2O3 coating amount (1%), the capacity retention of the material after 60 cycles increases from 90% to 99% at 2.8-4.3 V and from 86% to 99% at 2.8-4.5 V, respectively. The Al2O3-coated sample also delivers a better rate capability, maintaining 117 and 131 mA h g(-1) in the voltage ranges 2.8-4.3 and 2.8 V-4.5 V at the current density of 5 C, respectively. The enhanced properties of as-prepared Al2O3-coated LiNi0.8Co0.1Mn0.1O2 are due to the Al2O3 coating layer building up a favorable interface, preventing the direct contact between the active material and electrolyte and promoting Li+ transmission at the interface.
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