锂-二氧化锰一次电池由于其优良的理论比容量和较高的工作电压而受到人们的广泛关注。然而，锂-二氧化锰一次电池的电极结构和化学特性导致其较差的可循环性而使其一直无法二次化使用，在当今锂二次电池快速发展的浪潮下，锂-二氧化锰电池的应用受到了极大的局限。因此，克服其在二次循环中的电池寿命和安全性能等问题是当下研究的热点。凝胶聚合物电解质在改善锂枝晶生长和提高电池安全性方面具有独特的优势，已经成为从液态电解质过度到全固态电解质的必经之路。本文通过优化正极结构和化学组成，得到结构稳定的高能量密度正极材料，而后将凝胶聚合物电解质引入到电池中，进一步评价其电化学性能和安全性。研究表明，优化后的正极材料和凝胶聚合物电解质相结合可大大提升其初始容量，并且可以显著提高电池的循环稳定性，为锂-二氧化锰二次电池早日大规模应用指引了方向。

Lithium-manganese dioxide primary batteries have received widespread attention because of their excellent theoretical specific capacity and high operating voltage. However, the unique electrode structure and chemical characteristics of lithium-manganese dioxide primary batteries have led to their poor cycling stability, making it impossible to prepare secondary batteries. Under the current rapid development of lithium secondary batteries, the application of lithium-manganese dioxide secondary batteries has been greatly limited. Therefore, overcoming the problems such as short cycle lifespan and safety performance of the batteries are the hotspot of current research. Gel polymer electrolytes have various advantages in improving the growth of lithium dendrites and poor safety of batteries, and have become the best way to transition from liquid electrolytes to all-solid electrolytes. In this paper, a stable high-energy-density positive electrode material is obtained by optimizing the structure and chemical composition of the positive electrode. The gel polymer electrolyte is then introduced into the battery to further evaluate its electrochemical performance and safety. Studies have shown that the combination of the optimized cathode material and gel polymer electrolyte can greatly increase its initial specific capacity and reduce the capacity loss of the battery during cycling. This work will guide the direction for the early large-scale application of lithium-manganese dioxide secondary batteries.