多孔环氧树脂基固体电解质微观结构与性能

A variety of porous epoxy resins were prepared by reaction- induced phase separation method with polyethylene glycol 200 as pore making agent, bisphenol A diglycidyl ether as resin matrix, 4,4'-diaminodicyclohexylmethane (PACM) and polyether amine (D230) as curing agent. The effects of pore making agent ratio and curing agent on the micropore structure of porous epoxy resins were studied. The results show that with the increase of the proportion of pore- making agent, the porous epoxy resin structure of PACM system changes from non-through round holes to through structures connected with epoxy resin pellets, while the porous epoxy resin of D230 system gradually develops from independent pores to three- dimensional skeleton pores. The D230 three- dimensional through skeleton structure is more conducive to the removal of pore- making agents and the formation of ion channels, and obtains higher ionic conductivity (1.81 mS/cm) while retaining more complete resin skeleton. PACM spongy micropores are more likely to form closed pores, and higher ionic conductivity (2.02 mS/cm) can be obtained when the mass ratio of pore- making agent and resin is over 3:1, but at this time, the microscopic morphology is independent resin pellets, and the mechanical properties are lost. In addition, in the prepared resin solid electrolyte block structure, the ionic conductivity of D230 system was measured (0.35 mS/cm) at a lower pore- making agent ratio (mass ratio pore- making agent and resin of 2:1), indicating that the three-dimensional network structure of D230 system is more conducive to the formation of continuous ion channels than that of PACM system under large thickness conditions.