Abstract
The layered lattice structure of the nickel-rich LiNi0.94Co0.04Al0.02O2 (NCA) cathode material has the advantages of high energy density and low cost. Unfortunately, high nickel materials’ application is limited due to the fast decay of capacity. Doping and coating are effective methods to enhance cycle stability. In this study, the effects of Ti doping on the electrochemical performances of NCA are systematically investigated. Ni0.94Co0.04Al0.02(OH)2 and TiO2 are directly mixed, and after sintering, Ti4+ ions diffused uniformly in the LiNi0.94Co0.04Al0.02O2 cathode particles. Besides, (Ni0.4Co0.2Mn0.4)0.78Ti0.22(OH)2 is coated onto the surface of Ni0.94Co0.04Al0.02(OH)2 precursor particles with a facile co-precipitation method, and after sintering, Ti4+ ions also diffused uniformly. The cathodes were cycled in the voltage range of 2.8–4.5 V at 1 C. As a result, the discharge capacity of Ni0.94Co0.04Al0.02(OH)2 changes from 201.4 to 119.8 mAh g−1, and the battery capacity decayed rapidly within 200 cycles. Although the initial discharge capacity of the doped and covered specimens was not significantly dissimilar from the original precursor specimens, the capacity has only dropped by 20% after 200 charges and discharges.
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Funding
This work is financially supported by the Natural Science Foundation of Chongqing (cstc2020jcyj-msxmX0651) and the Scientific and Technological Innovation Foundation of Shunde Graduate School, USTB (grant no. BK19BE025, BK20BE012), and Research Project on Characteristic Innovation of University Teachers in Foshan City (grant no. 2020XCC04).
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Liu, W., Cheng, X., Wang, C. et al. Enhancing high cycle stability of Ni-rich LiNi0.94Co0.04Al0.02O2 layered cathode material. Ionics 27, 4619–4628 (2021). https://doi.org/10.1007/s11581-021-04240-5
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DOI: https://doi.org/10.1007/s11581-021-04240-5