Enhanced ionic conductivity and interface stability of hybrid solid-state polymer electrolyte for rechargeable lithium metal batteries

Sökning: L773:2405 8297 > Enhanced ionic cond...

Compared to conventional organic liquid electrolyte, solid-state polymer electrolytes are extensively considered as an alternative candidate for next generation high-energy batteries because of their high safety, non-leakage and electrochemical stability with the metallic lithium (Li) anode. However, solid-state polymer electrolytes generally show low ionic conductivity and high interfacial impedance to electrodes. Here we report a hybrid solid-state electrolyte, presenting an ultra-high ionic conductivity of 3.27 mS cm −1 at room temperature, a wide electrochemical stability window of 4.9 V, and non-flammability. This electrolyte consists of a polymer blend matrix (polyethylene oxide and poly (vinylidene fluoride-co-hexafluoropropylene)), Li + conductive ceramic filler (Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 ) and a solvate ionic liquid (LiFSI in tetra ethylene glycol dimethyl ether, 1:1 in molar ratio) as plasticizer. The introduction of the solvate ionic liquid to the solid-state electrolyte not only improves its ionic conductivity but also remarkably enhances the stability of the interface with Li anode. When applied in Li metal batteries, a Li|Li symmetric cell can operate stably over 800 h with a minimal polarization of 25 mV and a full Li|LiFePO 4 cell delivers a high specific capacity of 158 mAh g −1 after 100 cycles at room temperature.

Liu, YangyangXi'an Jiaotong University (författare)
Jiao, XingxingXi'an Jiaotong University (författare)
Song, ZhongxiaoXi'an Jiaotong University (författare)
Sadd, Matthew,1994Chalmers tekniska högskola,Chalmers University of Technology (författare)
Xu, Xiaoxiong (författare)
Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic (författare)
Xiong, Shizhao,1985Xi'an Jiaotong University,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)xiongs (författare)
Song, JiangxuanXi'an Jiaotong University (författare)
Xi'an Jiaotong UniversityChalmers tekniska högskola (creator_code:org_t)

Av författaren/redakt...: Liu, Qiao; Liu, Yangyang; Jiao, Xingxing; Song, Zhongxiao; Sadd, Matthew, 1 ...; Xu, Xiaoxiong; visa fler...; Matic, Aleksanda ...; Xiong, Shizhao, ...; Song, Jiangxuan; visa färre...

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