Cyanogroup‐Modified PEO‐Based Electrolytes Achieve High Free Al3+ Concentration and Improve the Transport Dynamics in Solid‐State Aluminum‐Ion Batteries

Polymer-based solid electrolyte boasting ultra-high safety, energy density, mechanical strength and flexibility, attracting much attention in the field of battery applications. However, its widespread application is hindered by the low conductivity, insufficient aluminium salt dissociation, high crystallization degree, short service life, etc. To solve the above problems, a composite solid polymer electrolyte (SPE) design based on polyethylene oxide (PEO, Mw = 6 000 000) with AlCl