Tan Feihu, An Hua, Li Ning, Du Jun, Peng Zhengchun
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
School of Microelectronics, South University of Science and Technology, Shenzhen 518055, China.
Nanomaterials (Basel). 2021 Apr 12;11(4):989. doi: 10.3390/nano11040989.
All-solid-state batteries (ASSBs) are attractive for energy storage, mainly because introducing solid-state electrolytes significantly improves the battery performance in terms of safety, energy density, process compatibility, etc., compared with liquid electrolytes. However, the ionic conductivity of the solid-state electrolyte and the interface between the electrolyte and the electrode are two key factors that limit the performance of ASSBs. In this work, we investigated the structure of a LiLaTiO (LLTO) thin-film solid electrolyte and the influence of different interfaces between LLTO electrolytes and electrodes on battery performance. The maximum ionic conductivity of the LLTO was 7.78 × 10 S/cm. Introducing a buffer layer could drastically improve the battery charging and discharging performance and cycle stability. Amorphous SiO allowed good physical contact with the electrode and the electrolyte, reduced the interface resistance, and improved the rate characteristics of the battery. The battery with the optimized interface could achieve 30C current output, and its capacity was 27.7% of the initial state after 1000 cycles. We achieved excellent performance and high stability by applying the dense amorphous SiO buffer layer, which indicates a promising strategy for the development of ASSBs.
全固态电池（ASSB）在能量存储方面具有吸引力，主要是因为与液体电解质相比，引入固态电解质在安全性、能量密度、工艺兼容性等方面显著提高了电池性能。然而，固态电解质的离子电导率以及电解质与电极之间的界面是限制全固态电池性能的两个关键因素。在这项工作中，我们研究了LiLaTiO（LLTO）薄膜固态电解质的结构以及LLTO电解质与电极之间不同界面对电池性能的影响。LLTO的最大离子电导率为7.78×10 S/cm。引入缓冲层可以显著提高电池的充放电性能和循环稳定性。非晶态SiO能使电极与电解质良好地物理接触，降低界面电阻，并改善电池的倍率性能。具有优化界面的电池能够实现30C的电流输出，经过1000次循环后其容量为初始状态的27.7%。通过应用致密的非晶态SiO缓冲层，我们实现了优异的性能和高稳定性，这表明了一种用于全固态电池开发的有前景的策略。
