溶剂热法水-二甘醇合成LiCoPO及其表面处理对锂电池性能的影响。
Solvothermal water-diethylene glycol synthesis of LiCoPO and effects of surface treatments on lithium battery performance.
作者信息
Zhang Min, Garcia-Araez Nuria, Hector Andrew L, Owen John R, Palgrave Robert G, Palmer Michael G, Soulé Samantha
机构信息
School of Chemistry, University of Southampton Highfield Southampton SO17 1BJ UK
Department of Chemistry, University College London 20 Gordon Street London WC1H 0AJ UK.
出版信息
RSC Adv. 2019 Jan 4;9(2):740-752. doi: 10.1039/c8ra08785g. eCollection 2019 Jan 2.
Olivine-structured LiCoPO is prepared a facile solvothermal synthesis, using various ratios of water/diethylene glycol co-solvent, followed by thermal treatment under Ar, air, 5%H/N or NH. The diethylene glycol plays an important role in tailoring the particle size of LiCoPO. It is found that using a ratio of water/diethylene glycol of 1 : 6 (v/v), LiCoPO is obtained with a homogenous particle size of ∼150 nm. The bare LiCoPO prepared after heating in Ar exhibits high initial discharge capacity of 147 mA h g at 0.1C with capacity retention of 70% after 40 cycles. This is attributed to the enhanced electronic conductivity of LiCoPO due to the presence of CoP after firing under Ar. The effects of carbon, TiN and RuO coating are also examined. Contrary to other studies, it is found that the solvothermally synthesised LiCoPO samples produced here do not require conductive coatings to achieve good performance.
通过简便的溶剂热合成法制备橄榄石结构的LiCoPO₄，使用不同比例的水/二甘醇共溶剂，随后在氩气、空气、5%H₂/N₂或氨气气氛下进行热处理。二甘醇在调整LiCoPO₄的粒径方面起着重要作用。发现使用水/二甘醇体积比为1∶6时，可获得粒径均匀约为150 nm的LiCoPO₄。在氩气中加热后制备的裸LiCoPO₄在0.1C下表现出147 mA h g的高初始放电容量，40次循环后容量保持率为70%。这归因于在氩气气氛下焙烧后由于存在CoP而提高了LiCoPO₄的电子导电性。还研究了碳、TiN和RuO₂涂层的影响。与其他研究相反，发现这里通过溶剂热合成制备的LiCoPO₄样品不需要导电涂层就能实现良好性能。
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