A novel ion-conductive protection skin based on polyimide gel polymer electrolyte: application to nanoscale coating layer of high voltage LiNi1/3Co1/3Mn1/3O2 cathode materials for lithium-ion batteries
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- A novel ion-conductive protection skin based on polyimide gel polymer electrolyte: application to nanoscale coating layer of high voltage LiNi1/3Co1/3Mn1/3O2 cathode materials for lithium-ion batteries
- Park, Jang-Hoon; Cho, Ju-Hyun; Kim, Sung-Bae; Kim, Woo-Sung; Lee, Sun-Young; Lee, Sang-Young
- Cathode active material; Cathode materials; Cell performance; Charge voltage; Coating layer; Continuous surface; Electrochemical decomposition; Gel polymer electrolytes; High voltage; High-voltage cycling; High-voltages; Ion transports; Liquid electrolytes; Lithium-ion battery; Nano scale; Nano-scale coatings; Nanometres; Nanoscale layers; Polyamic acids; Pyromellitic dianhydride; Salient features; Side reactions; Thermal imidization
- Issue Date
- ROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY, v.22, no.25, pp.12574 - 12581
- A new and facile approach for the surface modification of high-voltage LiNi 1/3Co 1/3Mn 1/3O 2 cathode active materials is demonstrated. This strategy is based on polyimide (PI) gel polymer electrolyte (GPE)-directed nanoscale wrapping. The PI coating layer successfully wraps a large area of the LiNi 1/3Co 1/3Mn 1/3O 2 surface via thermal imidization of (pyromellitic dianhydride/oxydianiline) polyamic acid. Salient features of the PI wrapping layer are the highly continuous surface coverage with nanometre thickness (∼10 nm) and the facile ion transport through the nanoscale layer. Based on a sound understanding of the nanoarchitectured PI wrapping layer, its influence on the cell performance and thermal stability of high-voltage LiNi 1/3Co 1/3Mn 1/3O 2 is investigated as a function of charge cut-off voltage (herein, 4.6 and 4.8 V). The anomalous PI wrapping layer substantially improves the high-voltage cycling performance and alleviates the interfacial exothermic reaction between delithiated LiNi 1/3Co 1/3Mn 1/3O 2 and liquid electrolyte. These results demonstrate that the PI wrapping layer effectively prevents the direct exposure of the LiNi 1/3Co 1/3Mn 1/3O 2 surface to liquid electrolytes that are highly vulnerable to electrochemical decomposition at high charge voltage conditions, thus behaving as a novel ion-conductive protection skin that mitigates the unwanted interfacial side reactions.
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