Nickel-rich layered cathode materials have drawn a lot of attention due to their much higher energydensity and lower cost. However, there is still a challenge in long-term cycling stability for practicalapplication. In this work, a modification strategy of encapsulation on primary particles of NCM811 isapplied to improve the electrochemical performance of LiNi0.80Co0.10Mn0.10O2 (NCM811) by effecitivelymitigating particle cracking and surface deterioration of NCM811. Compared with the general NCM811(G0-811), the optimized NCM811 (O3-811) exhibites higher specific capacity and much improved cyclestability. After 800 cycles, the capacity retion of O3-811 is 91.8%, while the capacity of G0-811 fadesrapidly in 430 cycles. Cross section SEM, EIS and DSC have been applied for futher abservation on thecycled O3-811 in comparison with G0-811. The results comfirm that the encapsulating NCM811primary particles as well as secondary spheres into LiBO2 successfully improves the electrochemicalperformances and structure stability of NCM811, which is hopeful for commercial application.
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