多酸簇合物作为电池电极材料的研究

Lithium-ion battery as a new type of green environment-friendly rechargeable battery has been widely used in portable electronic equipment, electric vehicles and other renewable energy systems, energy storage devices. Sodium ion batteries have attracted considerable attention as a large-scale energy storage application because of their abundant sodium resources. For the first time, we have used giant polyoxometalates and polyoxometalates-based nanocomposites to improve the volume expansion, poor cycle stability and poor magnification performance of the reported materials during the charge and discharge process. Polyoxometalates and its composite materials have excellent redox ability, and also have the advantages of simple preparation process, high yield and economical availability. Furthermore, we investigated the electrochemical properties of the obtained materials and the electrochemical mechanism. It was found that the giant polyoxometalates has many transition metal oxides in the one molecule, which leads to multiple electron transfer during the redox reaction with the structural stability, and thus has excellent cycle stability and rate performance. The proposal of this topic has a certain guiding role and commercial application prospect for preparing high performance lithium ion battery and sodium ion battery.

锂离子电池作为一种新型绿色环保型的可充电电池，在便携式电子设备，电动汽车等可再生能源系统的能量储存装置中广泛应用。钠离子电池因为其钠离子资源丰富而作为大规模能量储存应用引起了极大的关注。本课题首次选用轮簇状多酸以及多酸基复合材料，致力于改善目前报道的材料存在的充放电过程中体积膨胀、循环稳定性差和倍率性能差等问题。本课题选用的多酸及其复合材料具有优异的氧化还原能力，同时具有制备过程简易、产率高、经济可得等优点。进一步我们对所得材料进行电化学性能表征以及电化学机理研究，发现多酸簇合物由于在同一个单分子中存在许多过渡金属氧化物，导致其在进行氧化还原反应提供多重电子转移，并且结构能稳定存在，因而具有优异的循环稳定性和倍率性能。本课题的提出对于制备高性能的锂离子电池和钠离子电池有一定的指导作用和商业应用前景。

锂离子电池是便携式电子和能量储存设备中应用最广泛的一种。改善目前报道的锂电材料存在的充放电过程中体积膨胀、循环稳定性差和倍率性能差等问题是当今需要解决的科学问题。本项目拟采用多酸为前驱体来合成纳米复合材料，从而进行能源储存方面的研究。主要基于：（1）多酸具有明确的分子结构，能进一步在分子层面上对电池存储机制进行完善；（2）多酸具有优异的氧化还原能力，在同一个单分子中存在许多过渡金属氧化物，导致其在进行氧化还原反应提供多重电子转移，并且结构能稳定存在；（3）具有制备过程简易、产率高、经济可得等优点。本课题的提出对于制备高性能的储能设备有一定的指导作用和商业应用前景。