Enhancement on structural stability of Ni-rich cathode materials by in-situ fabricating dual-modified layer for lithium-ion batteries. (November 2019)

• Record Type: Journal Article
• Authors: Liu, Yang; Tang, Lin-bo; Wei, Han-xin; Zhang, Xia-hui; He, Zhen-jiang; Li, Yun-jiao; Zheng, Jun-chao
• Is Part Of: Nano energy. Volume 65(2019)
• Publication Date: 2019-11
• Subjects: Lithium ion battery -- Cathode material -- LiNi0.8Co0.1Mn0.1O2 -- Coating -- Electrochemical performance; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2019.104043
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Ni-rich cathodes have been considered as promising cathodes for Li-ion batteries (LIBs) because their high electrochemical capacities and low costs. However, fast capacity fading caused by interfacial instability and bulk structural degradation of Ni-rich cathodes during charge-discharge processes severely hinders their development and application. To address these challenges, we report a one-step dual-modification strategy to in-situ synthesize complex In2 O3 &LiInO2 co-coating layer on the surface of LiNi0.8 Co0.1 Mn0.1 O2, which can cooperate collaboratively to stabilize layered structure and deplete lithium impurity. The dual-modified LiNi0.8 Co0.1 Mn0.1 O2 materials not only show distinguished cycling stability at 1 C with a capacity retention of ca. 90%, but also exhibit a discharge capacity of 177.1 mAh g −1 at a high rate of 5 C with a capacity retention of 86.4% after 300 cycles. Further studies confirm structural degradation and intergranular cracks at the particle level can be effectively mitigated by uniformly adherent bi-functional coating layer even after long-term cycling. The results shed light on the feasibility of dual-modified strategy for improving the performance of Ni-rich cathode materials, which can also be applied to other oxide cathode materials. Graphical abstract: Image 1 Highlights: LiInO2 with similar structure to LiNi0.8 Co0.1 Mn0.1 O2 ensures stable adhesion of dual-modified layer and structural stability of material. Indium oxide can consume LiOH and Li2 CO3 residues on the surface of LiNi0.8 Co0.1 Mn0.1 O2 . Modified LiNi0.8 Co0.1 Mn0.1 O2 shows excellent rate and cycling properties attributing to synergistic effects of dual-modified layer.