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One-pot coating of LiCoPO4/C by a UiO-66 metal–organic framework

机译:UIO-66金属 - 有机框架的LiCopo4 / C一锅涂层

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LiCoPO _(4) (LCP) is a promising high voltage cathode material but suffers from low conductivity and poor electrochemical properties. These properties can be improved by coating with a conductive carbon layer. Ongoing research is focused on the protective layer with good adhesion and inhibition of electrolyte decomposition reactions. In the present work, we suggest a new robust one-pot procedure, featuring the introduction of UiO-66 metal–organic framework (MOF) nanoparticles during LCP synthesis to create a metal–carbon layer upon annealing. The LiCoPO _(4) /C@UiO-66 was synthesized via the microwave-assisted solvothermal route, and 147 mA h g ~(?1) discharge capacity was obtained in the first cycle. The MOF acts as a source of both carbon and metal atoms, which improves conductivity. Using operando X-ray absorption spectroscopy upon cycling, we identify two Co-related phases in the sample and exclude the olivine structure degradation as an explanation for a long-term capacity fade.
机译:LiCoPo _(4)(LCP)是一个有前途的高压阴极材料,但患有低导电性和差的电化学性质。可以通过用导电碳层涂覆来改善这些性质。正在进行的研究专注于保护层,具有良好的附着力和电解质分解反应的抑制。在目前的工作中,我们建议一种新的强大的单盆手术,在LCP合成期间引入UIO-66金属 - 有机骨架(MOF)纳米颗粒,以在退火时产生金属碳层。通过微波辅助溶剂热途径合成LiCoPo _(4)/ C @ UIO-66,并在第一循环中获得147mA H G〜(α1)放电容量。 MOF作为碳和金属原子的来源,这提高了电导率。在循环时使用Operando X射线吸收光谱,我们在样品中鉴定两个共同相关阶段,并将Olivine结构降解作为用于长期容量褪色的解释。

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