Modification of LiNi0.5Co0.2Mn0.3O2 cathode material using nano TiO2 to enhance the cycle stability in high-voltage ranges

• Published in: Materials letters Vol. 207; pp. 217 - 220
• Main Authors: Li, Puliang, Xue, Longlong, Li, Yunjiao, Su, Qianye, Chen, Yongxiang, Cao, Guolin, Lei, Tongxin, Zhu, Jie, Deng, Shiyi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.2017; Elsevier BV
• Subjects: Cathode material; Cathodes; Composite materials; Cracks; Cycles; Electric potential; Electrode materials; Electrodes; Functional; Li-ion battery; LiNi0.5Co0.2Mn0.3O2; Materials science; Microcracks; Polycrystals; TiO2 modification; Titanium dioxide; Titanium oxides; Functional; Cathode material; Composite materials; Li-ion battery; TiO2 modification; LiNi0.5Co0.2Mn0.3O2
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2017.07.035

•The capacity retention is increased from 75.6% to 86.9% in 3.0–4.4V.•The capacity retention is increased from 74.1% to 87.2% in 3.0–4.6V.•TiO2 modification suppress particles pulverization and formation of microcraks.•TiO2 modification stabilize the layered structure and suppress the impedance growth. Nano TiO2 with low crystallinity is employed to improve the high-voltage cycling performance of LiNi0.5Co0.2Mn0.3O2 cathode material. Nano TiO2 is homogeneously distributed on the surface by EDS and TEM analysis. TiO2-modified sample delivers capacity retentions of 86.9% (200 cycles) and 87.2% (100 cycles) in 3.0–4.4V and 3.0–4.6V, respectively, which are much greater than that of unmodified sample (75.6% and 74.1%). The morphology, structure and impedances changes of the cycled electrodes are detailedly discussed. Nano TiO2 modification contributes to stabilize the layered structure, remit the particles pulverization and suppress the impedance growth and the formation of microcracks, resulting in the excellent high-voltage cycling performance of the material.