Abstract
Ni-rich lithium transition metal oxides with a layered structure is one of the promising cathode candidates for Lithium-ion batteries owing to their many advantages, e.g., high energy density, low cost, and eco-friendly. However, the Ni-rich cathodes such as NMC811 show poor cycle life, which obstructs their large-scale applications. Herein, we introduce a scalable mechanofusion process to produce a core-shell structure of NMC811 that can enhance its electrochemical capacity and cycling stability, exclusively at 18650 cell level. The multifunctional shell consists of four materials including conductive carbon black, reduced graphene oxide (rGO), lithium garnet (LLZO), and Al2O3. As a result, the coated NMC811 shows outstanding performance with high-capacity retention of 95% after 250 cycles. The improved electrochemical performance is due to the core-shell structure with enhanced electrical conductivity and better protection of highly active NMC811 materials. Figure 1
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