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首页> 外文期刊>Electrochimica Acta >Ni-rich LiNi0.8Co0.1Mn0.1O2 coated with Li-ion conductive Li3PO4 as competitive cathodes for high-energy-density lithium ion batteries
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Ni-rich LiNi0.8Co0.1Mn0.1O2 coated with Li-ion conductive Li3PO4 as competitive cathodes for high-energy-density lithium ion batteries

机译：Ni-RINI0.8CO0.1MN0.10.1MN0.1O2涂有锂离子导电LI3PO4，作为高能密度锂离子电池的竞争阴极

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摘要

Recently, the Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode with high-energy applications has received tremendous interest for Li-ion batteries (LIBs). But it still suffers from serious capacity degradation upon cycling owing to the involved sur-/interface issues. In the work, we first propose an efficient surface modification strategy to in-situ fabricate the NCM811 coated with solid electrolyte Li3PO4, and systematically investigate the effect of Li3PO4 nano coating layer on electrochemical stability of the NCM811 for LIBs as competitive cathodes. It is the smart surface coating of Li+ conductive Li3PO4 that lowers the sensitivity to H2O and CO2, relieves the evolution of strain-induced intergranular micro-cracks, slows the HF corrosion, and retains the fast Li+ diffusion coefficients with appropriate coating content. The optimized NCM811@Li3PO4 cathode yields the remarkable electrochemical Li-storage properties in terms of reversible capacities, capacity retention and rate behaviors. More competitively, the NCM811@Li3PO4 based pouch-type devices deliver a cell-level energy density of -304.6 Wh kg(-1), along with a capacity retention of 89.6% over 250 cycles at 1.0 C. The appealing features highlight promising application of the resultant NCM811@Li3PO4 cathodes in next-generation LIBs. (C) 2020 Elsevier Ltd. All rights reserved.
机译：近年来，随着高能源应用的富Ni LiNi0.8Co0.1Mn0.1O2（NCM811）阴极已经获得了锂离子电池（LIBS）极大的兴趣。但由于涉及的SUR /界面问题，循环仍然存在严重的能力下降。在该工作中，我们首先提出了一种有效的表面改性策略，原位制造涂有固体电解质Li3PO4的NCM811，并系统地研究Li3PO4纳米涂层对Libs作为竞争阴极的NCM811电化学稳定性的影响。它是Li +导电Li3PO4的智能表面涂层，降低了对H 2 O和CO2的敏感性，减轻了应变诱导的晶间微裂纹的演变，减慢了HF腐蚀，并保留了具有适当涂层含量的快速Li +扩散系数。优化的NCM811 @ Li3PO4阴极在可逆容量，容量保留和速率行为方面产生了显着的电化学LI储能性能。更竞争地，NCM811 @ Li3PO4的袋型器件可提供-304.6WHKG（-1）的电池级能量密度，并且容量保持超过250次以上的89.6％。吸引人的功能突出了有希望的应用在下一代Libs中的结果NCM811 @ Li3PO4阴极。 （c）2020 elestvier有限公司保留所有权利。

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