This technology is a solid electrolyte that improves both mechanical strength and ionic conductivity by dispersing exfoliated organoclay (montmorillonite) within a semi-interpenetrating polymer network (semi-IPN), while also suppressing lithium and sodium dendrite growth.
Conventional gel polymer electrolytes (GPE) face a trade-off where increasing liquid content to boost ionic conductivity results in reduced mechanical strength. Furthermore, when used with lithium metal anodes, dendrite formation leads to decreased stability and shorter cycle life.
This technology utilizes a nanocomposite structure in which 1–3 parts by weight of exfoliated organo-montmorillonite are dispersed in a semi-IPN matrix composed of cross-linked ETPTA and non-cross-linked PVdF-HFP polymers. The high aspect ratio and dielectric constant of the clay increase polymer chain flexibility, lowering the glass transition temperature and raising the lithium-ion transference number to induce uniform ion deposition. Applicable to both lithium metal and sodium-ion batteries, it ensures the durability of UV-curable thin-film electrolytes by adding only a small amount of inexpensive natural clay.
This invention was developed with support from the Ministry of Science and ICT for hyper-ion transport channel-based superionic conductive flexible materials.
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