金属锂
电解质
原位
电池(电)
锂电池
材料科学
聚合物
化学工程
锂(药物)
金属
离子键合
无机化学
电极
化学
冶金
有机化学
复合材料
离子
物理化学
热力学
物理
功率(物理)
内分泌学
工程类
医学
作者
Wenhao Ren,Yafang Zhang,Ruixin Lv,Shiyuan Guo,Wenjia Wu,Yong Liu,Jingtao Wang
标识
DOI:10.1016/j.jpowsour.2022.231773
摘要
Solid-state polymer electrolytes, featuring excellent processability and flexibility, have received considerable attentions. However, the inherent low ionic conductivity, especially at subzero temperatures, limits their widespread application. Herein, quasi-solid polymer electrolyte (QSPE) with high low-temperature ionic conduction ability is prepared by in-situ ring-opening polymerization of 1,3-Dioxlane with fluoroethylene carbonate (FEC) as plasticizer. The in-situ polymerization imparts good interface contact between QSPE and electrode. The addition of FEC improves the chain mobility and facilitates the dissociation of LiTFSI, giving QSPE a remarkable ionic conductivity and Li + transference number (2.4 × 10 −5 S cm −1 at −60 °C and 0.55 at −20 ° C), two orders of magnitude and 2.3 times higher than those of liquid electrolyte, respectively. As a result, the Li/QSPE/Li cell without significant polarization is obtained, which can operate at 0.2 mA cm −2 and 0 °C for 850 h. Moreover, the LiFePO 4 /Li cell exhibits excellent cycling stability at 0.2 C and 0 °C: its capacity remains 125.2 mAh g −1 at 400th cycle, exceeding most polymer electrolytes. Even at −20 °C, a discharge capacity of 73.3 mAh g −1 is obtained at 100th cycle under 0.2 C. • QSPE is prepared by in-situ polymerization of DOL with FEC as plasticizer. • In-situ polymerization imparts good interface contact between QSPE and electrode. • The presence of FEC improves chain mobility and promotes lithium salt dissociation. • High ionic conductivity of 1.69 × 10 −4 S cm −1 at −40 °C is achieved. • A high cell performance of 73.3 mAh g −1 after 100 cycles at −20 °C is obtained.
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