Kim, Hyeongwoo Jang, Jihye Byun, Dongjin Kim, Hyung-Seok Choi, Wonchang 2024-01-19T18:32:20Z 2024-01-19T18:32:20Z 2021-09-04 2019-12-19 1864-5631 https://pubs.kist.re.kr/handle/201004/119186 Ni-rich layered oxides are promising cathode materials for developing high-energy lithium-ion batteries. To overcome the major challenge of surface degradation, a TiO2 surface coating based on polydopamine (PDA) modification was investigated in this study. The PDA precoating layer had abundant OH catechol groups, which attracted Ti(OEt)(4) molecules in ethanol solvent and contributed towards obtaining a uniform TiO2 nanolayer after calcination. Owing to the uniform coating of the TiO2 nanolayer, TiO2-coated PDA-LiNi0.6Co0.2Mn0.2O2 (TiO2-PNCM) displayed an excellent electrochemical stability during cycling under high voltage (3.0-4.5 V vs. Li+/Li), during which the cathode material undergoes a highly oxidative charge process. In addition, TiO2-PNCM exhibited excellent cyclability at elevated temperature (60 degrees C) compared with the bare NCM. The surface degradation of the Ni-rich cathode material, which is accelerated under harsh cycling conditions, was effectively suppressed after the formation of an ultra-thin TiO2 coating layer. English WILEY-V C H VERLAG GMBH ENHANCED ELECTROCHEMICAL PERFORMANCE LINI0.8CO0.1MN0.1O2 CATHODE MATERIAL TRANSITION-METAL OXIDE HIGH CUTOFF VOLTAGE LI-ION BATTERIES LINI0.6CO0.2MN0.2O2 CATHODE HIGH-CAPACITY LINI1/3CO1/3MN1/3O2 GRAPHENE NANOPARTICLES Selective TiO2 Nanolayer Coating by Polydopamine Modification for Highly Stable Ni-Rich Layered Oxides Article 10.1002/cssc.201902998 1 CHEMSUSCHEM, v.12, no.24, pp.5253 - 5264 CHEMSUSCHEM 12 24 5253 5264 scie scopus 000498436200001 2-s2.0-85075711546 Chemistry, Multidisciplinary Green & Sustainable Science & Technology Chemistry Science & Technology - Other Topics Article ENHANCED ELECTROCHEMICAL PERFORMANCE LINI0.8CO0.1MN0.1O2 CATHODE MATERIAL TRANSITION-METAL OXIDE HIGH CUTOFF VOLTAGE LI-ION BATTERIES LINI0.6CO0.2MN0.2O2 CATHODE HIGH-CAPACITY LINI1/3CO1/3MN1/3O2 GRAPHENE NANOPARTICLES cathode materials lithium-ion batteries Ni-rich layered oxides polydopamine surface modification