含酸盐的triblock共聚合物电解质,以提高离子转移数和接口稳定性
Jiao Guo1, Hongliang Xu1, Yuxue Sun1
1National & Local United Engineering Laboratory for Power Battery, Department of Chemistry, Northeast Normal University, Changchun 130024, China.
Journal of colloid and interface science
|January 24, 2024
概括
新的与酸盐的triblock共聚合物电解质通过实现高离子转移数 (tLi+) 和稳定的循环,提高了离子电池的性能. 这些先进的电解质为下一代离子电池提供了更好的安全性和效率.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物科学 聚合物科学
背景情况:
- 高离子转移数 (tLi+) 对于通过减少度极化来提高离子电池 (LIB) 性能至关重要.
- 开发稳定和高效的固态电解质是更安全和高性能LIB的关键.
研究的目的:
- 为LIBs合成和表征含有酸盐组的新型triblock共聚合物电解质 (PBOEE).
- 为了研究sp2混合原子对阳离子定和离子转移的影响.
- 评估开发的电解质的电化学性能,离子导电能力和稳定性.
主要方法:
- 合成含有酸盐组的triblock共聚合物电解质 (PBOEE).
- 测量离子转移数 (tLi+) 和离子电导率.
- 对Li对称细胞和LiFePO4/PBOEE/Li全细胞进行电化学测试.
- 分析固体电解质间相 (SEI) 形成和电化学稳定性.
主要成果:
- 由于酸盐组结离子,PBOEE电解质达到高达0.53的tLi+.
- 酸盐组促进了稳定,有机丰富的SEI膜的形成,使Li的对称细胞循环超过3100小时.
- 优化的PBOEE_24显示离子导电率为1.41 × 10−4 S cm−1 和电化学稳定窗口为4.8 V.
- 在50°C时,LiFePO4/PBOEE_24/Li电池显示出优异的容量保留 (85%在0.5°C的600个循环后).
结论:
- 含有sp2混合原子的triblock共聚合物有效提高离子转移和电池性能.
- 开发的PBOEE电解质显示为先进的LIBs的稳定,高性能全固态聚合物电解质具有前途.
- 酸盐功能化是设计下一代固态电解质的可行策略.
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