Enhanced electrochemical performance of LiAlO2-LiMnPO4/C composite using LiAlO(2)from AAO synthesis by hydrothermal rout
Enhanced electrochemical performance of LiAlO2-LiMnPO4/C composite using LiAlO(2)from AAO synthesis by hydrothermal rout
复制标题
使用 AAO 水热法合成的 LiAlO(2) 增强 LiAlO2-LiMnPO4/C 复合材料的电化学性能
DOI：
10.1007/s11581-020-03654-x
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发表时间：
2020
期刊：
影响因子：
2.8
通讯作者：
Li Junzhe
中科院分区：
文献类型：
--
作者：
Chang Longjiao;Luo Shaohua;Li Sinan;Lang Xiaoshi;San Xinyue;Liu Jianan;Li Junzhe
以阳极氧化铝(AAO)为模板，采用水热法成功合成了铝酸锂(LiAlO2)，并探索了其作为LiMnPO4/C锂电池复合材料的可能性。LiAlO2纳米板孔结构继承了阳极氧化铝(AAO)结构，作为生长LiMnPO4纳米晶的衬底，提供了高比表面积的多孔结构。对样品的形貌、结构和电化学性质进行了分析。用到的仪器有X射线衍射仪、扫描电子显微镜、高分辨电子显微镜和充放电测试系统。用热重分析法研究了前驱体水热反应后的结晶转变过程。氮气吸附实验结果表明，LiAlO2的比表面积为118.6×10~2/g，孔体积为0.89×cm~3/g。此外，10%的LiAlO2-LiMnPO4/C电极具有优良的电化学性能，0.1℃下的首次放电容量为144mAhg，而LiMnPO4/C电极的首次放电容量为121mAhg/g。LiAlO2能阻碍电极和电解液的直接接触，从而减小了带电状态下阴极的直接接触面积，这是由于LiAlO2在LiMnPO4颗粒的活性表面周围起到离子导电线的作用。
Lithium aluminate (LiAlO2) has been successfully synthesized by a hydrothermal reaction based on using the anodic alumina (AAO) as the template and explored as the compound materials in LiMnPO4/C lithium battery. LiAlO2nanoplate porous structure is inherited from anodic aluminum oxide (AAO) structure and serves as substrates to grow LiMnPO4nanocrystals, which provide a high surface area with a porous structure. The morphology, structure, and electrochemical properties of the samples were analyzed. The instruments used in this process are X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscope (HRTEM), and charge-discharge test system. The crystallization transition process of the precursor after hydrothermal reaction was researched by thermal gravity analysis. The specific surface area and pore volume of LiAlO2are 118.6 m2/g and 0.89 cm3/g, which were confirmed by the method of nitrogen adsorption. Moreover, the 10% content LiAlO2-LiMnPO4/C has the excellent electrochemical performance, and its first discharge capacity is 144 mAh/g at 0.1 C, compared with the LiMnPO4/C electrode (121 mAh/g at 0.1 C). The LiAlO2can obstruct the direct contact of electrode and electrolyte, thus reducing their direct contact areas of cathode at charged state, owing to the fact that LiAlO2around the active surfaces of LiMnPO4grains acts as an ionic conductive wiring.