Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202010261
Keywords
high‐ energy‐ density; lithium‐ metal batteries; non‐ flammable; polymer electrolytes; ultrathin dual‐ salt polymer electrolyte
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Funding
- Hong Kong Innovation and Technology Fund [UIM/369, ITS/292/18FP]
- Research Grants Council of Hong Kong [16207615, 16227016, 16204517]
- Guangzhou Science and Technology Program [201807010074]
- Yinlong Energy Co., Ltd.
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By utilizing an ultrathin and non-flammable dual-salt polymer electrolyte, stable interfaces were formed between the anode and cathode, effectively preventing the formation of Li dendrites and promoting cyclic stability in Li-metal batteries with Ni-rich cathodes.
Rechargeable batteries with Li-metal anodes and Ni-rich LiNixMnyCozO2 (x + y + z = 1, NMC) cathodes promise high-energy-density storage solutions. However, commercial carbonate-based electrolytes (CBEs) induce deteriorative interfacial reactions to both Li-metal and NMC, leading to Li dendrite formation and NMC degradation. Moreover, CBEs are thermally unstable and flammable, demonstrating severe safety risks. In this study, an ultrathin and non-flammable dual-salt polymer electrolyte (DSPE) is proposed via lightweight polytetrafluoroethylene scaffold, poly(vinylidene fluoride-co-hexafluoropropylene) polymeric matrix, dual-salt, and adiponitrile/fluoroethylene carbonate functional plasticizers. The as-obtained DSPE exhibits an ultralow thickness of 20 mu m, high room temperature ionic conductivity of 0.45 mS cm(-1), and a large electrochemical window (4.91 V versus Li/Li+). The dual-salt synergized with functional plasticizers is used to fabricate a stable interface layer on both anode and cathode. In-depth experimental and theoretical analyses have revealed the formation of stable interfaces between the DSPE and the anode/cathodes. As a result, the DSPE effectively prevents Li/DSPE/Li symmetric cell from short-circuiting after 1200 h, indicating effective suppression of Li dendrites. Moreover, the Li/DSPE/NMC cell delivers outstanding cyclic stability at 2 C, maintaining a high capacity of 112 mAh g(-1) over 1000 cycles.
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