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首页> 外文期刊>RSC Advances >Self-standing Li1.2Mn0.6Ni0.2O2/graphene membrane as a binder-free cathode for Li-ion batteries
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Self-standing Li1.2Mn0.6Ni0.2O2/graphene membrane as a binder-free cathode for Li-ion batteries

机译：自立式Li1.2Mn0.6Ni0.2O2 /石墨烯膜作为锂离子电池的无粘合剂阴极

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摘要

Lithium-rich transition-metal layered oxides (LROs), such as Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) , are promising cathode materials for application in Li-ion batteries, but the low initial coulombic efficiency, severe voltage fade and poor rate performance of the LROs restrict their commercial application. Herein, a self-standing Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) /graphene membrane was synthesized as a binder-free cathode for Li-ion batteries. Integrating the graphene membrane with Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) forming a Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) /graphene structure significantly increases the surface areas and pore volumes of the cathode, as well as the reversibility of oxygen redox during the charge–discharge process. The initial discharge capacity of the Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) /graphene membrane is ～270 mA h g ~(?1) (～240 mA h g ~(?1) for Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) ) and its initial coulombic efficiency is 90% (72% for Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) ) at a current density of 40 mA g ~(?1) . The capacity retention of the Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) /graphene membrane remains at 88% at 40 mA g ~(?1) after 80 cycles, and the rate performance is largely improved compared with that of the pristine Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) . The improved performance of the Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) /graphene membrane is ascribed to the lower charge-transfer resistance and solid electrolyte interphase resistance of the Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) /graphene membrane compared to that of Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) . Moreover, the lithium ion diffusion of the Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) /graphene membrane is enhanced by three orders of magnitude compared to that of Li _(1.2) Mn _(0.6) Ni _(0.2) O _(2) . This work may provide a new avenue to improve the electrochemical performance of LROs through tuning the oxygen redox progress during cycling.
机译：富锂的过渡金属层状氧化物（LRO），例如Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）是有望用于锂离子电池的正极材料，但其含量低LRO的初始库仑效率，严重的电压衰减和较差的速率性能限制了其商业应用。在此，合成了独立的Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）/石墨烯膜作为锂离子电池的无粘结剂阴极。将石墨烯膜与Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）集成以形成Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）/石墨烯结构显着增加了阴极的表面积和孔体积，以及在充放电过程中氧气氧化还原的可逆性。 Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）/石墨烯膜的初始放电容量为〜270 mA hg〜（？1）（〜240 mA hg〜（？1） Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2））的初始库伦效率为90％（Li _（1.2）Mn _（0.6）Ni _（0.2）O _的库仑效率为90％ （2））在40 mA g〜（？1）的电流密度下。 Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）/石墨烯膜在80 mA循环后在40 mA g〜（？1）下的容量保持率保持在88％，并且速率性能为与原始的Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）相比有了很大的改善。 Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）/石墨烯膜的性能改善归因于Li _（1.2）Mn的较低的电荷转移电阻和固体电解质相间电阻_（0.6）Ni _（0.2）O _（2）/石墨烯膜与Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）相比。而且，与Li _（1.2）Mn _（+）相比，Li _（1.2）Mn _（0.6）Ni _（0.2）O _（2）/石墨烯膜的锂离子扩散增加了三个数量级。 0.6）Ni _（0.2）O _（2）。这项工作可能会提供一个新的途径，可通过调节循环过程中的氧还原进程来改善LRO的电化学性能。

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