Incorporating Ethylene Oxide Functionalized Inorganic Particles to Solid Polymer Electrolytes for Enhanced Mechanical Stability and Electrochemical Performance

Solid-state batteries based on polymer electrolytes attract increasing interest owing to their high feasibility of roll-to-roll mass production. However, the mechanical strength is not sufficient suppress formation lithium dendrites, leading early capacity fading. Many researchers have attempted reinforce by adding inorganic particles, but insufficient compatibility between particles and can cause agglomerate, deteriorating stability resulting hybrid electrolytes. Herein, surface-functionalized are used prepare (HPEs). The surface aluminum oxide (Al2O3) nanoparticles chemically modified an organic material containing ethylene (EO) group. EO group functionalized Al2O3 (F-Al2O3) enables uniform dispersion in improves ionic conductivity electrochemical stability. nanoindentation measurements show that with F-Al2O3 (HPE-F-Al2O3) enhanced stiffness. also benefit from incorporating F-Al2O3. As a result, battery Li anode, LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode, HPE-F-Al2O3 electrolyte demonstrates stable long-term cycling retention up 87% over 100 cycles.