期刊
SMALL
卷 14, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201801420
关键词
flexible; lithium dendrites; lithium-ion transference numbers; lithium metal batteries; single-ion conducting electrolytes
类别
资金
- National Natural Science Foundation of China [U1301244, U1601211, 51573215, 21506260]
- Guangdong Province Sci and Tech Bureau [2017B090901003, 2016B010114004, 2016A050503001]
- Natural Science Foundation of Guangdong Province [2016A030313354]
- Special Project on the Integration of Industry, Education and Research of Guangdong Province [2015B09090100]
- Guangzhou Scientific and Technological Planning Project [2014J4500002, 201607010042, 201804020025]
- Fundamental Research Funds for the Central Universities [171gjc37]
A novel single-ion conducting polymer electrolyte (SIPE) membrane with high lithium-ion transference number, good mechanical strength, and excellent ionic conductivity is designed and synthesized by facile coupling of lithium bis(allylmalonato) borate (LiBAMB), pentaerythritol tetrakis (2-mercaptoacetate) (PETMP) and 3,6-dioxa-1,8-octanedithiol (DODT) in an electrospun poly(vinylidienefluoride) (PVDF) supporting membrane via a one-step photoinitiated in situ thiol-ene click reaction. The structure-optimized LiBAMB-PETMP-DODT (LPD)@PVDF SIPE shows an outstanding ionic conductivity of 1.32 x 10(-3) S cm(-1) at 25 degrees C, together with a high lithium-ion transference number of 0.92 and wide electrochemical window up to 6.0 V. The SIPE exhibits high tensile strength of 7.2 MPa and elongation at break of 269%. Due to these superior performances, the SIPE can suppress lithium dendrite growth, which is confirmed by galvanostatic Li plating/stripping cycling test and analysis of morphology of Li metal electrode surface after cycling test. Li vertical bar LPD@PVDF vertical bar Li symmetric cell maintains an extremely stable and low overpotential without short circuiting over the 1050 h cycle. The Li vertical bar LPD@PVDF vertical bar LiFePO4 cell shows excellent rate capacity and outstanding cycle performance compared to cells based on a conventional liquid electrolyte (LE) with Celgard separator. The facile approach of the SIPE provides an effective and promising electrolyte for safe, long-life, and high-rate lithium metal batteries.
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