Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 39, Pages 13779-13785Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b06364
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Funding
- NSF of China [51532002, 51572141, 51625202]
- Research Fund of Science and Technology in Shenzhen [JSGG20150331155519130]
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Easy processing and flexibility of polymer electrolytes make them very promising in developing all-solid-state lithium batteries. However, their low room temperature conductivity and poor mechanical and thermal properties still hinder their applications. Here, we use Li6.75La3Zr1.73Ta0.23O12 (LLZTO) ceramics to trigger structural modification of poly(vinylidene fluoride) (PVDF) polymer electrolyte. By combining experiments and first-principle calculations, we find that La atom of LLZTO could complex with the N atom and C=0 group of solvent molecules such as N,N-dimethylformamide along with electrons enriching at the N atom, which behaves like a Lewis base and induces the chemical dehydrofluorination of the PVDF skeleton. Partially modified PVDF chains activate the interactions between the PVDF matrix, lithium salt, and LLZTO fillers, hence leading to significantly improved performance of the flexible electrolyte membrane (e.g., a high ionic conductivity of about 5 x 10(-4) S cm(-1) at 25 degrees C, high mechanical strength, and good thermal stability). For further illustration, a solid-state lithium battery of LiCoO2 vertical bar PVDF-based membrane vertical bar Li is fabricated and delivers satisfactory rate capability and cycling stability at room temperature. Our study indicates that the LLZTO modifying PVDF membrane is a promising electrolyte used for all-solid-state lithium batteries.
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