Long Cycle Life Solid-State Solid Polymer Electrolyte Cells

对两种采用碱离子导电固体聚合物电解质（SPE）的电化学可逆固态电池进行了优化设计。对于导电锂的SPE，将使用插锂金红石材料（LixWO2）作为负极，二硫化钛作为正极。在钠导电固相萃取中，基于过渡金属掺杂氧化铝的均质基质电极将分别用作正极和负极。在这里，过渡金属将被纳入“氧化铝结构”内的不移动铝晶格位置，在电池充放电循环时，电化学电位的变化将通过涉及这些掺杂的不移动过渡金属物种的氧化还原电化学发生。具有这些结构的二次电池分别具有2.2和1.5V的开路电位，具有良好的电化学可逆性，理论能量密度分别为175和178 Wh/kg。一旦固态组件被表征和优化，它们将被整合到密封原型中。这些二次固态电池预期的高可靠性将使它们成为各种应用的良好候选者，如公用事业负载均衡、电子和电致变色显示器的可逆存储设备、植入式生物医学应用以及专门航空航天应用的可逆电源。

Two electrochemically reversible solid-state batteries using alkali-ion-conducting solid polymer electrolyte (SPE) are to be optimized. For lithium-conducting SPE, a lithium intercalating rutile material (LixWO2) will be used for the negative electrode and titanium disulfide for the positive electrode. In using sodium-conducting SPE, homogeneous matrix electrodes based upon transition metal doped "-alumina will be used for the respective positive and negative elctrodes. Here transition metals will be incorporated into immobile aluminum lattice sites within the "-alumina structure where changes in electrochemical potential upon cell charge/discharge cycling will occur via redox electrochemistry involving these doped immobile transition metal species. Secondary cells possessing these configurations had respective open-circuit potentials of 2.2 and 1.5V, demonstrated good electrochemical reversibility and had theoretical energy dentsities of 175 and 178 Wh/kg. Once the solid-state components are characterized and optimized, they will be incorporated into hermetically sealed prototypes. The anticipated high reliability of these secondary solid-state cells will make them good candidates for such varied applications as utility load leveling, reversible storage devices for electronic and electrochromic displays, in implanted biomedical applications, and reversible power sources in specialized aerospace applications.