All-solid-state lithium batteries (ASSLBs) are important for enhancing safety across various applications related to lithium-ion batteries (LIBs). Lithium iron phosphate (LiFePO₄) is a widely utilized commercial cathode in LIBs, prized for its stable cycling performance, thermal stability, and low cost. However, low electronic conductivity and slow ion diffusion kinetics limit its application at high rates and low temperatures. Herein, Ti₃C₂T_x MXene nanosheets (NSs) are introduced into the LiFePO₄ cathode. The continuous electron-conducting networks are constructed due to the high electrical conductivity of Ti₃C₂T_x NSs. Meanwhile, the coordination environment of lithium ions in the cathode is weakened by the oxygenated end groups of Ti₃C₂T_x NSs, and thus efficient ion-percolating networks are constructed. Therefore, the ionic and electronic conductivities of the modified cathode are significantly improved. Assembled all-solid-state LiFePO₄/Li full cells with poly(ethylene oxide) as electrolyte exhibits high initial discharged capacities of 91.5 mAh g⁻¹ at 10 C, and capacities of 155.1 mAh g⁻¹ after 1000 cycles at 1 C with a retention rate of 93.8%. Furthermore, the cells still deliver excellent performance at high loading, room temperature, and low temperature. This work offers a facile and scalable strategy for designing high-performance ASSLBs.

中文翻译：

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用于全固态锂电池的 Ti3C2Tx MXene 增强型高性能 LiFePO4 正极


全固态锂电池 （ASSLB） 对于提高与锂离子电池 （LIB） 相关的各种应用的安全性非常重要。磷酸铁锂 （LiFePO ₄ ） 是锂离子电池中广泛使用的商业阴极，因其稳定的循环性能、热稳定性和低成本而备受推崇。然而，低电子电导率和缓慢的离子扩散动力学限制了它在高速率和低温下的应用。在此，Ti ₃ C ₂ T _x MXene 纳米片 （NS） 被引入 LiFePO ₄ 阴极。连续电子导电网络是由于 Ti ₃ C ₂ T _x NS 的高导电性而构建的。同时，Ti ₃ C ₂ T _x NSs的含氧端基削弱了阴极中锂离子的配位环境，从而构建了高效的离子渗透网络。因此，改性阴极的离子电导率和电子电导率得到显著提高。以聚环氧乙烷为电解质的组装全固态 LiFePO ₄ /Li 满电池在 10 C 下表现出 91.5 mAh g ⁻¹ 的高初始放电容量，在 1 C 下循环 1000 次后容量为 155.1 mAh g ⁻¹ ，保留率为 93.8%。此外，这些电池在高负载、室温和低温下仍能提供出色的性能。这项工作为设计高性能 ASSLB 提供了一种简单且可扩展的策略。