下一代离子电池:多价金属离子存储的准固态方法
Kee Wah Leong1, Wending Pan1, Xiaoping Yi2
1Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong.
Science advances
|August 9, 2023
概括
一种新型的准固态离子电池 (QSMB) 克服了水和非水系统的局限性. 这种高能量密度电池即使在零度以下的温度下也能提供稳定的性能,从而推进了多价值金属离子存储.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子 (Mg-ion) 电池由于安全性和成本,是离子电池的有希望的替代品.
- 现有的Mg离子电池技术面临着挑战:非水态系统的离子导电性较差,水态系统的电化学窗口较窄.
- 之前的盐水电池实现了>2V,但受到质子插入而不是Mg离子插入的限制.
研究的目的:
- 设计一个准固态离子电池 (QSMB),用于高效的多价金属离子存储.
- 为了克服水性和非水性Mg离子电池系统的局限性.
- 为了提高Mg离子电池的能量密度和电化学稳定性.
主要方法:
- 开发一个准固态离子电池 (QSMB) 架构.
- 将键网络限制在QSMB内,以促进真正的多价离子离子储存.
- 电化学测试用于评估性能指标,包括能量密度,电压和循环稳定性.
主要成果:
- 该QSMB的能量密度为264 W·小时kg−1,明显高于水性Mg-离子电池.
- 在2.6和2.0V之间观察到稳定的电压平原,其性能优于其他Mg-ion电池系统.
- 在零度以下温度 (-22°C) 时,QSMB表现出良好的容量保留 (在900个循环后90%).
结论:
- 该QSMB设计成功地整合了水性和非水性电池系统的优势.
- 这种创新方法可以实现高性能多价金属离子电池,包括Mg离子系统.
- QSMB为开发更安全,高能量密度的电池提供了可行的途径,其低温性能得到了改进.
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