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首页> 外文期刊>Advanced energy materials >Li_2O:Li–Mn–O Disordered Rock-Salt Nanocomposites as Cathode Prelithiation Additives for High-Energy Density Li-Ion Batteries
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Li_2O:Li–Mn–O Disordered Rock-Salt Nanocomposites as Cathode Prelithiation Additives for High-Energy Density Li-Ion Batteries

机译：Li_2O：Li–Mn–O无序岩石盐纳米复合材料作为高能密度锂离子电池的阴极预锂化添加剂

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摘要

The irreversible loss of lithium from the cathode material during the first cycles of rechargeable Li-ion batteries notably reduces the overall cell capacity. Here, a new family of sacrificial cathode additives based on Li2O:Li2/3Mn1/3O5/6 composites synthesized by mechanochemical alloying is reported. These nanocomposites display record (but irreversible) capacities within the Li-Mn-O systems studied, of up to 1157 mAh g(-1), which represents an increase of over 300% of the originally reported capacity in Li2/3Mn1/3O5/6 disordered rock salts. Such a high irreversible capacity is achieved by the reaction between Li2O and Li2/3Mn1/3O5/6 during the first charge, where electrochemically active Li2O acts as a Li+ donor. A 13% increase of the LiFePO4 and LiCoO2 first charge gravimetric capacities is demonstrated by the addition of only 2 wt% of the nanosized composite in the cathode mixture. This result shows the great potential of these newly discovered sacrificial additives to counteract initial losses of Li+ ions and improve battery performance.
机译：在可充电锂离子电池的第一个循环中，锂从正极材料中不可逆转地损失，明显降低了整体电池容量。在此，报道了一种新的基于机械化学合金化合成的Li2O：Li2 / 3Mn1 / 3O5 / 6复合材料的牺牲阴极添加剂。这些纳米复合材料在所研究的Li-Mn-O系统中显示出记录的（但不可逆）容量，高达1157 mAh g（-1），这代表了最初报道的Li2 / 3Mn1 / 3O5 /的容量的300％以上6无序岩盐。通过在首次充电过程中Li2O和Li2 / 3Mn1 / 3O5 / 6之间的反应实现了如此高的不可逆容量，其中电化学活性Li2O充当Li +供体。通过在阴极混合物中仅添加2 wt％的纳米复合材料，证明了LiFePO4和LiCoO2的初次充电重量增加了13％。该结果表明，这些新发现的牺牲添加剂具有巨大的潜力，可以抵消Li +离子的初始损失并改善电池性能。

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