Wang Jin, Huang Gang, Chen Kai, Zhang Xin-Bo
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, Changchun, 130022, P. R. China.
Angew Chem Int Ed Engl. 2020 Jun 8;59(24):9382-9387. doi: 10.1002/anie.202002309. Epub 2020 Apr 14.
The limited triple-phase boundaries (TPBs) in solid-state cathodes (SSCs) and high resistance imposed by solid electrolytes (SEs) make the achievement of high-performance all-solid-state lithium-oxygen (ASS Li-O ) batteries a challenge. Herein, an adjustable-porosity plastic crystal electrolyte (PCE) has been fabricated by employing a thermally induced phase separation (TIPS) technique to overcome the above tricky issues. The SSC produced through the in-situ introduction of the porous PCE on the surface of the active material, facilitates the simultaneous transfer of Li /e , as well as ensures fast flow of O , forming continuous and abundant TPBs. The high Li conductivity, softness, and adhesion of the dense PCE significantly reduce the battery resistance to 115 Ω. As a result, the ASS Li-O battery based on this adjustable-porosity PCE exhibits superior performances with high specific capacity (5963 mAh g ), good rate capability, and stable cycling life up to 130 cycles at 32 °C. This novel design and exciting results could open a new avenue for ASS Li-O batteries.
固态阴极（SSCs）中有限的三相边界（TPBs）以及固体电解质（SEs）施加的高电阻使得高性能全固态锂氧（ASS Li-O₂）电池的实现成为一项挑战。在此，通过采用热致相分离（TIPS）技术制备了一种孔隙率可调的塑性晶体电解质（PCE），以克服上述棘手问题。通过在活性材料表面原位引入多孔PCE制备的SSC，促进了Li⁺/e⁻的同时传输，并确保了O₂的快速流动，形成连续且丰富的TPBs。致密PCE的高Li⁺电导率、柔软性和粘附性显著降低电池电阻至115 Ω。结果，基于这种孔隙率可调PCE的ASS Li-O₂电池表现出优异的性能，具有高比容量（5963 mAh g⁻¹）、良好的倍率性能以及在32 °C下高达130次循环的稳定循环寿命。这种新颖的设计和令人振奋的结果可为ASS Li-O₂电池开辟一条新途径。
