| In-situ construction of a Mg-modified interface to guide uniform lithium deposition for stable all-solid-state batteries |
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| 作者姓名： | Tiefeng Liu Jiale Zheng Hualiang Hu Ouwei Sheng Zhijin Ju Gongxun Lu Yujing Liu Jianwei Nai Yao Wang Wenkui Zhang Xinyong Tao |
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| 作者单位： | College of Materials Science and Engineering |
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| 基金项目： | financial support from the National Natural Science Foundation of China(Grant no.51722210,51972285,U1802254,11904317,and 21902144);the Natural Science Foundation of Zhejiang Province(Grant no.LY17E020010 and LD18E020003);the Innovation Fund of the Zhejiang Kechuang New Materials Research Institute(Grant no.ZKN-18P05)。 |
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| 摘 要： | Uniform lithium(Li)deposition in all-solid-state Li metal batteries is greatly influenced by the anode/electrolyte interface.Herein,a Mg-modified interface was constructed via the simple in-situ electrochemical reduction of Mg2+from Mg(TFSI)2 in polyethylene oxide(PEO)and a Li bis(trifluoromethane)sulfoni mide(Li TFSI)formulae.As confirmed by cryogenic transmission electron microscopy,the anode/electrolyte interface exhibited hybrids consisting of crystalline Mg,Li2O,and Li dots embedded in an amorphous polymer electrolyte.The crystalline Mg dots guided the uniform Li nucleation and growth,inducing a smoother anode/electrolyte interface compared with the pristine electrolyte.With 1 wt%Mg(TFSI)2 in the PEO-Li TFSI electrolyte,the Mg-modified electrolyte enabled the Li/Li symmetric cells with cycling performance of over 1700 and 1400 h at current densities of 0.1 and 0.2 m A cm-2,respectively.Moreover,the full LFP/Li cells using the novel Mg-modified electrolyte delivered a cycling lifespan of over 450 cycles with negligible capacity loss.
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| 关 键 词： | Li metal PEO electrolyte Mg-modified interface Li dendrite CRYO-TEM |
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