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Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
Research Interests
  • Soft Materials for Energy Storage/ Conversion Systems


Polarity-tuned Gel Polymer Electrolyte Coating of High-voltage LiCoO2 Cathode Materials

DC Field Value Language Park, Jang-Hoon ko Cho, Ju-Hyun ko Kim, Jong-Su ko Shim, Eun-Gi ko Lee, Yun-Sung ko Lee, Sang-Young ko 2014-09-18T02:27:04Z - 2014-09-17 ko 2011 ko
dc.identifier.citation 전기화학회지, v.14, no.2, pp.117 - 124 ko
dc.identifier.issn 1229-1935 ko
dc.identifier.uri -
dc.description.abstract We demonstrate a new surface modification of high-voltage lithium cobalt oxide (tex:\small\textstyle$LiCoO_2$) cathode active materials for lithium-ion batteries. This approach is based on exploitation of a polarity-tuned gel polymer electrolyte (GPE) coating. Herein, two contrast polymers having different polarity are chosen: polyimide (PI) synthesized from thermally curing 4-component (pyromellitic dianhydride/biphenyl dianhydride/phenylenediamine/oxydianiline) polyamic acid (as a polar GPE) and ethylene-vinyl acetate copolymer (EVA) containing 12 wt% vinyl acetate repeating unit (as a less polar GPE). The strong affinity of polyamic acid for tex:\small\textstyle$LiCoO_2$ allows the resulting PI coating layer to present a highly-continuous surface film of nanometer thickness. On the other hand, the less polar EVA coating layer is poorly deposited onto the tex:\small\textstyle$LiCoO_2$, resulting in a locally agglomerated morphology with relatively high thickness. Based on the characterization of GPE coating layers, their structural difference on the electrochemical performance and thermal stability of high-voltage (herein, 4.4 V) tex:\small\textstyle$LiCoO_2$ is thoroughly investigated. In comparison to the EVA coating layer, the PI coating layer is effective in preventing the direct exposure of tex:\small\textstyle$LiCoO_2$ to liquid electrolyte, which thus plays a viable role in improving the high-voltage cell performance and mitigating the interfacial exothermic reaction between the charged tex:\small\textstyle$LiCoO_2$ and liquid electrolytes. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher 한국전기화학회 ko
dc.subject Lithium-ion batteries ko
dc.subject High-voltage lithium cobalt oxide ko
dc.subject Polarity ko
dc.subject Gel polymer electrolyte coating ko
dc.subject Polyimide ko
dc.subject Ethylene-vinyl acetate copolymer ko
dc.title Polarity-tuned Gel Polymer Electrolyte Coating of High-voltage LiCoO2 Cathode Materials ko
dc.type ARTICLE ko
dc.type.rims ART ko
dc.identifier.doi 10.5229/JKES.2011.14.2.117 ko
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