Abstract
Lithium metal batteries show great potential in energy storage because of their high energy density. Nevertheless, building a stable solid electrolyte interphase (SEI) and restraining the dendrite growth are difficult to realize with traditional liquid electrolytes. Solid and gel electrolytes are considered promising candidates to restrain the dendrites growth, while they are still limited by low ionic conductivity and incompatible interphases. Herein, a dual‐salt (LiTFSI‐LiPF6) gel polymer electrolyte (GPE) with 3D cross‐linked polymer network is designed to address these issues. By introducing a dual salt in 3D structure fabricated using an in situ polymerization method, the 3D‐GPE exhibits a high ionic conductivity (0.56 mS cm−1 at room temperature) and builds a robust and conductive SEI on the lithium metal surface. Consequently, the Li metal batteries using 3D‐GPE can markedly reduce the dendrite growth and achieve 87.93% capacity retention after cycling for 300 cycles. This work demonstrates a promising method to design electrolytes for lithium metal batteries.
Highlights
Lithium metal batteries show great potential in energy storage because of their restrained the practical usages of lithium metal battery (LMB).[4,6] Lithium metal is relatively unstable conhigh energy density
Liquid electrolyte fabricated using an in situ polymerization method, the 3D-gel polymer electrolyte (GPE) exhibits a high ionic conductivity (0.56 mS cm−1 at room temperature) and builds a robust and conductive solid electrolyte interphase (SEI) on the lithium metal surface
The X-ray diffraction (XRD) is used to measure the crystallinity of the structures (Figure 2c), it distinctly shows that all the gel electrolytes, whatever volume ratio it is, are totally amorphous and lithium salts are absolutely dissolved in the mixture, which are beneficial to Li-ion transfer and further enhance the ion conductivity of the GPEs
Summary
Lithium metal batteries show great potential in energy storage because of their restrained the practical usages of LMB.[4,6] Lithium metal is relatively unstable conhigh energy density. Liquid electrolyte fabricated using an in situ polymerization method, the 3D-GPE exhibits a high ionic conductivity (0.56 mS cm−1 at room temperature) and builds a robust and conductive SEI on the lithium metal surface.
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