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What is the practical application effect of polymer electrolyte in batteries?

The practical application effect of polymer electrolyte in batteries is reflected in many aspects, including safety, ionic conductivity, mechanical properties, and interface compatibility with electrode materials.

Improved safety

Polymer electrolytes significantly improve battery safety compared to traditional liquid electrolytes due to their non-flammable properties. They maintain good performance when operating at high temperatures, and are not prone to serious thermal runaway problems in the case of short circuit, overcharge, etc.

Ionic conductivity

The polymer electrolyte can improve its ionic conductivity by optimizing its structural composition, such as using metal salts with large anionic volume and introducing electron-deficient groups. For example, a lithium bonded polymer electrolyte (PAEV) prepared by a one-step photopolymerization strategy has an ionic conductivity of 3.7×10^-3 S/cm at 25℃.

Mechanical properties

The polymer electrolyte has good mechanical strength, which helps to maintain the stability of the structure during battery assembly and use. By adjusting the composition of the polymer electrolyte, such as the ratio of PEO/PS/PMMA, the mechanical properties can be optimized, for example, at a mass ratio of 75:10:15, the polymer electrolyte membrane exhibits an ionic conductivity of 3.56×10^-4 S·cm^-1 and a tensile strength of 11.56 MPa.

Interface compatibility

The polymer electrolyte has good interface compatibility with the electrode material, which is crucial for improving battery performance. For example, the PVDF-HFP-based gel polymer electrolyte demonstrated good electrode interface compatibility, and the assembled lithium iron phosphate battery was cycled 80 times at 1C charge/discharge ratio, and the capacity retention rate reached 89%.

Inhibition of lithium dendrite growth

In lithium metal batteries, the polymer electrolyte can effectively inhibit the growth of lithium dendrite, which is very important to improve the cycle stability and safety of the battery.

Environmentally friendly and cost effective

Polymer electrolytes are also inexpensive, environmentally friendly, easy to package and leak free, providing the possibility for next-generation batteries with high energy density and high safety.

CONCLUSION

In summary, the practical application effect of polymer electrolytes in batteries is positive, and they play an important role in improving battery safety, ionic conductivity, mechanical properties and interface compatibility, showing great potential in the development of battery technology.

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