In this study, we successfully synthesized a novel LiCoPO (LCP) nanosheet cathode materials with nitrogen and fluorine co-doped carbon layer (LCP/C–NF) using a solvothermal method and carbonization process in multiple carbon sources including sucrose, polyvinylidene fluoride (PVDF), and cetyltrimethylammonium bromide (CTAB). The LCP nanosheets possess a high exposure of (010) crystal planes which shortens the Li transport path. The N and F co-doped carbon coating layer had more defects and facilitates the formation of Co–N and Co–F bonds at the interface between the carbon coating and LCP, resulting in improved interface stability and suppressed Co element dissolution. LCP/C–NF exhibits excellent discharge capacity of 126.69 mAh g at a current rate of 1 C, with a capacity retention of 98.99% after 200 cycles and 64.94% after 1000 cycles. At a high current density of 10 C, the initial specific capacity is 112.1 mAh g, with a capacity retention of 53.32% after 500 cycles. Additionally, this material maintains high electrochemical activity even at low temperatures of 0 and -15 °C. The N and F co-doped carbon coating method has a strategic significance in the industrial application of high voltage Olivine-type lithium cobalt phosphate cathode materials.

中文翻译：

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超高性能锂离子电池用氮掺杂碳涂层高压磷酸钴锂

在这项研究中，我们采用溶剂热法和碳化过程，在蔗糖、聚偏二氟乙烯（PVDF）等多种碳源中成功合成了一种具有氮氟共掺杂碳层的新型LiCoPO（LCP）纳米片正极材料（LCP/C-NF） ）和十六烷基三甲基溴化铵（CTAB）。 LCP纳米片具有高度暴露的(010)晶面，这缩短了Li传输路径。 N、F共掺杂的碳涂层具有更多的缺陷，有利于碳涂层与LCP界面处Co-N和Co-F键的形成，从而提高了界面稳定性并抑制了Co元素的溶解。 LCP/C-NF在1 C电流倍率下表现出优异的放电容量为126.69 mAh g，200次循环后容量保持率为98.99%，1000次循环后容量保持率为64.94%。在10 C高电流密度下，初始比容量为112.1 mAh g，500次循环后容量保持率为53.32%。此外，即使在 0 至 -15 °C 的低温下，该材料也能保持较高的电化学活性。 N、F共掺碳包覆方法对于高电压橄榄石型磷酸钴锂正极材料的工业化应用具有战略意义。