Regulating lithium deposition via bifunctional regular-random cross-linking network solid polymer electrolyte for Li metal batteries

JOURNAL OF POWER SOURCES

卷:484

Article

Fu, Fang¹  Lu, Wei¹  Zheng, Yue¹  Chen, Kai¹  Sun, Chen¹  Cong, Lina¹  Liu, Yulong¹  Xie, Haiming¹  Sun, Liqun¹ 

[1] Northeast Normal Univ Changchun, Dept Chem, Natl & Local United Engn Lab Power Battery, Changchun 130024, Peoples R China

关键词: Solid polymer electrolyte;    Dual cross-linking network;    All-solid-state lithium metal batteries;    Dendrite-free;    Interfacial stability;   

DOI  :  10.1016/j.jpowsour.2020.229186

来源: Elsevier

【 摘 要 】

The low coulombic efficiency and poor cycle performance deriving from uncontrolled growth of dendrites have caused a serious obstacle to the practical application of lithium metal. Herein we propose a bifunctional regular-random dual cross-linking network solid polymer electrolyte (RRa-SPE) for dendrite-free all-solid-state lithium metal batteries. Under the synergistic effect of regular polymerization skeleton and random cross-linking network, the RRa-SPE effectively regulates the lithium deposition and facilitates the generation of a highly homogeneous and robust solid-electrolyte interphase (SEI) layer on lithium metal. Besides, this RRa-SPE shows benign ionic conductivity of 4.36 x 10(-4) S cm(-1) (at 30 degrees C), high lithium ion transference number of 0.76 and enhanced mechanical strength. The Li/RRa-SPE/Li symmetric cell maintains low and stable voltage polarization (0.15 V) after circulating for 1200 hat 0.5 mA cm(-2). Improved LiFePO4/RRa-SPE/Li cell exhibits excellent rate capability and prominent cycle performance with a capacity retention of 99.6% after 240 cycles at 0.5 Cat 30 degrees C.

【 授权许可】

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