1. Regulating lithium deposition via bifunctional regular-random cross-linking network solid polymer electrolyte for Li metal batteries.
- Author
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Fu, Fang, Lu, Wei, Zheng, Yue, Chen, Kai, Sun, Chen, Cong, Lina, Liu, Yulong, Xie, Haiming, and Sun, Liqun
- Subjects
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LITHIUM-ion batteries , *IONIC conductivity , *METALS , *LITHIUM ions , *LITHIUM cells , *POLYMER networks , *POLYELECTROLYTES - Abstract
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 × 10−4 S cm−1 (at 30 °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 h at 0.5 mA cm−2. Improved LiFePO 4 /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 C at 30 °C. Image 1 The SPE is prepared via a facile UV-derived dual-reaction. With bifunctional network, the SPE effectively regulates the lithium deposition. The SPE shows enhanced ionic conductivity of 4.36 × 10−4 S cm−1 at 30 °C. The SPE exhibits high lithium ion transference number of 0.76. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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