罗树亮博士论文"Clearing surficial charge-transport obstacles to boost the performance of lithium-rich layered oxides"被Chemical Engineering Journal接收发表
发布时间：2020-04-25
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The interfacial properties of cathode material in Li-ion batteries play a vital role for the mass transport in electrochemical processes. In this paper, Li2RuO3 coating layer, acting as electronic/ionic conductive networks, is introduced to lithium-rich Mn-based material, which is known for its low rate capability and quick capacity fading. The reaction kinetic is promoted due to the depolarizing effect of this modified layer and the target material could achieve a discharge capacity as high as 195.4 and 150.6 mAh g−1 at 2C and 8C, respectively. The conductive Li2RuO3 coating layer could accelerate Li ion and electron transport at grain surface and relieve phase transformation, ultimately reducing the reaction resistance. Cycle stability is also enhanced (capacity retention of 92% after 100 cycles) by mitigating side reactions with electrolyte and suppressing the dissolution of transition metals. This study provides an effective approach to ameliorate the sluggish Li-ion transport of lithium-rich Mn-based material and other analogous cathode materials.
