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DC Field | Value | Language |
---|---|---|
dc.citation.endPage | 124 | - |
dc.citation.number | 2 | - |
dc.citation.startPage | 117 | - |
dc.citation.title | 전기화학회지 | - |
dc.citation.volume | 14 | - |
dc.contributor.author | Park, Jang-Hoon | - |
dc.contributor.author | Cho, Ju-Hyun | - |
dc.contributor.author | Kim, Jong-Su | - |
dc.contributor.author | Shim, Eun-Gi | - |
dc.contributor.author | Lee, Yun-Sung | - |
dc.contributor.author | Lee, Sang-Young | - |
dc.date.accessioned | 2023-12-22T06:38:08Z | - |
dc.date.available | 2023-12-22T06:38:08Z | - |
dc.date.created | 2014-09-17 | - |
dc.date.issued | 2011 | - |
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. | - |
dc.identifier.bibliographicCitation | 전기화학회지, v.14, no.2, pp.117 - 124 | - |
dc.identifier.doi | 10.5229/JKES.2011.14.2.117 | - |
dc.identifier.issn | 1229-1935 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/6157 | - |
dc.language | 영어 | - |
dc.publisher | 한국전기화학회 | - |
dc.title | Polarity-tuned Gel Polymer Electrolyte Coating of High-voltage LiCoO2 Cathode Materials | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | other | - |
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