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Solvothermal water-diethylene glycol synthesis of LiCoPO4 and effects of surface treatments on lithium battery performance

机译：溶剂热水-二乙二醇合成LiCoPO4及其表面处理对锂电池性能的影响

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摘要

Olivine-structured LiCoPO _(4) is prepared via a facile solvothermal synthesis, using various ratios of water/diethylene glycol co-solvent, followed by thermal treatment under Ar, air, 5%H _(2) /N _(2) or NH _(3) . The diethylene glycol plays an important role in tailoring the particle size of LiCoPO _(4) . It is found that using a ratio of water/diethylene glycol of 1?:?6 (v/v), LiCoPO _(4) is obtained with a homogenous particle size of ～150 nm. The bare LiCoPO _(4) prepared after heating in Ar exhibits high initial discharge capacity of 147 mA h g ~(?1) at 0.1C with capacity retention of 70% after 40 cycles. This is attributed to the enhanced electronic conductivity of LiCoPO _(4) due to the presence of Co _(2) P after firing under Ar. The effects of carbon, TiN and RuO _(2) coating are also examined. Contrary to other studies, it is found that the solvothermally synthesised LiCoPO _(4) samples produced here do not require conductive coatings to achieve good performance.
机译：橄榄石结构的LiCoPO _（4）是通过轻松的溶剂热合成制备的，使用各种比例的水/二甘醇助溶剂，然后在Ar，空气，5％H _（2）/ N _（2）下进行热处理或NH _（3）。二甘醇在调整LiCoPO_（4）的粒径方面起着重要作用。结果发现，使用水/二甘醇的比例为1？：？6（v / v），可以获得LiCoPO_（4），均相粒径为〜150 nm。在Ar中加热后制得的裸LiCoPO_（4）在0.1C时显示出147 mA h g〜（？1）的高初始放电容量，在40个循环后保持70％的容量。这归因于由于在Ar下焙烧后Co_（2）P的存在，LiCoPO_（4）的电子电导率提高。还检查了碳，TiN和RuO_（2）涂层的影响。与其他研究相反，发现此处生产的溶剂热合成LiCoPO_（4）样品不需要导电涂层即可获得良好的性能。

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