Preparation And Study Of Compound Electrolyte Based On Thermosetting Resin

Multifunctional structural battery incorporates the energy storage with the structural member, reducing the mass of system effectively, saving more space, and improves effective loading. This article aimed at the compound electrolyte which used in the structural battery. Thermosetting resin was applied as the matrix. Technological process and proportion of reagent were studied to prepare a kind of compound electrolyte that match specific environment where the structural b attery could be used.To improve the mechanical property of the structure loading phase, nano-Si O2 was added. Considering the content of nano-Si O2 in resin matrix of TDE-85, mass fraction of 5% improved the bending strength by 52.3%, to 276.62 MPa. The tensile strength was improved by 38.6%, reaching 102.13 MPa. Besides, 32% nano-Si O2 in water-borne epoxy resin improved the bending strength of its cured substance to 15.28 MPa, by 21.9%. Meanwhile, the electrolyte uptake and the performance of holding electrolyte were all improved because of the addition of nano-Si O2.A method of extraction- adsorption was used to prepare the compound electrolyte, which took TDE-85 as matrix. Mixture of naphthalene/DBP was used for pore- forming. When the volume ratio of naphthalene to DBP was 3:1, the structure loading phase had best performance, with bending strength of 23.76 MPa and electrolyte uptake of 77.91%. Precursor was got by ball milling process, and a 2h aging treatment modified its surface appearance. Separator was applied to protect the cathode material by covering it, which efficiently bettered the interface between resins and cathode materials. It improved the ionic conductivity of this compound electrolyte to a magnitude of 10-3 S/m, and led to a better specific capacity of batteries that took it in use. The discharging specific capacity was 155.6 m Ah/g with the 0.05 C discharge rate, and the capacity was kept in 91.4% with 50 charge-discharge cycles at 0.5 C discharge rate.Water-borne epoxy resin was another system in use. By means of volatilizing aqueous phase and polymerizing directly, porous structure was got. The bending strength of it was 15.28 MPa and electrolyte uptake was 66.17%. Condensate in this system existed as spherality, providing through- hole with a diameter of roughly 1?m, which showed well capillary effect. If the process of polymerization occurred on the surface of cathode materials, the ionic conductivity of this compound electrolyte was 5.1×10-4 S/m. The discharging specific capacity was 140.9 m Ah/g with the 0.1 C discharge rate, and 91.0 m Ah/g with 5 C. By covering separator over the cathode material, the discharging specific separately increased to 148.0 m Ah/g and 99.5 m Ah/g. In this condition, the capacity was kept in 98.5% with 50 charge-discharge cycles at 0.5 C discharge rate, better than that with TDE-85.Compound electrolyte based on thermosetting resin could be better by ameliorating the interface. Performance of discharge was well with low current density. However, it got to be worse with higher current density. It indicated that structure of the compound electrolyte played a part in protecting the circuitry by limiting discharge current, especially when cells were short-circuited. This feature could tremendously amend the security issues brought by short-circuit or high temperature environment. It led to another problem that this kind of compound electrolyte was unable to be used in structural batteries that high power density was needed.