【摘 要】
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A uniform diffusion layer is essential for non-dendritic deposition of lithium in high-density lithium bat-teries.However,natural pristine solid electrolyte int
【机 构】
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Beijing Key Laboratory for Chemical Power Source and Green Catalysis,School of Chemistry and Chemica
论文部分内容阅读
A uniform diffusion layer is essential for non-dendritic deposition of lithium in high-density lithium bat-teries.However,natural pristine solid electrolyte interface(SE1)is always porous and inhomogeneous because of repeated breakdown and repair cycles,whereas ideal materials with excellent mechanical property for artificial SEls remain a challenge.Herein,a robust and stable interface is achieved by spin-ning soft polymer associated with few MoO3 into fibers,and thus mechanical property of fibers other than materials determines mechanical performance of the interface which can be optimized by adjusting parameters.Furthermore,lithium deposited underneath the layer is enabled by constructing an optimal resistance to make the membrane serve as an artificial SEI rather than lithium host.As a result,dendrite-free lithium was observed underneath the membrane,and stable interface for long-term cycling was also indicated by EIS measurements.The lithium iron phosphate(LiFePO4)full-cell with coated electrode demonstrated an initial capacity of 155.2 mAh g-1,and 80％of its original capacity was retained after 500 cycles at 2.0℃without any additive in carbonate-based electrolyte.
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