Authors: Decheng Ding, Hui Ma, Xiaomeng Fan, Xinzhu Su, Huachao Tao, Xuelin Yang, Dong Zhou, Li‐Zhen Fan
Published: 2025-05-28
Source: Full article
AbstractLarge interfacial impedance, severe spontaneous reaction and poor ion transport efficiency between Li1.3Al0.3Ti1.7(PO4)3 (LATP) and Li metal interface are the main bottlenecks restricting the development of LATP‐based solid‐state batteries. Herein, a fast Li+ transfer and electron‐blocking interface composed of Li2O/LixIn is constructed on LATP through an in situ electrochemical reaction of In2O3 with Li metal. Li2O with low Li+ migration energy barrier and electron‐blocking injection can accelerates Li+ diffusion and suppresses dendrite growth at the interface. LixIn has a high bilateral affinity with Li metal and LATP, which significantly enhances the contact between LATP and Li metal. The initial resistance of the Li/In2O3@LATP/Li symmetric battery is reduced from 1211.4 to 106.5 Ω cm−2, and the critical current density is significantly increased to 1.9 mA cm−2. At high current density and discharge depth, it can stably cycle without dendrites for over 3700 h at 0.2 mA cm−2/0.2 mAh cm−2, and 1800 h at 0.4 mA cm−2/0.4 mAh cm−2. The Li/In2O3@LATP/LiFePO4 full battery shows excellent electrochemical performance, after 600 cycles, each cycle decay rate of ≈0.015% at 0.8 C and 25 °C. When matched with Li1.2Mn0.6Ni0.2O2 cathode, the full battery also has good compatibility with 4.8 V and high capacity.