扩展离子电容器Ah级袋式电池使100C超快充能力成为可能
Zerui Yan1, Sicheng Fan1, Yuting Song1
1State Key Laboratory of Physical Chemistry of Solid Surface, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials, Xiamen University, Xiamen, 361005, P.R. China.
这项研究引入了一种使用活性碳电极的新型离子电容器,实现高能量密度和快速充电,无需预先化. 这一突破简化了制造,并提高了先进的储能解决方案的性能.
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:
- 传统的混合离子电容由于狭窄的潜在窗口而受到有限的能量存储能力的影响,并且需要复杂的前化/前化步骤.
- 活性碳负电极 (AC NE) 通常形成固体电解质相间层 (SEI),阻碍在某些电压范围内的性能.
研究的目的:
- 开发一种高性能离子电容 (SIC),克服传统混合离子电容的局限性.
- 为了证明在没有SEI形成的广泛潜在窗口中使用活性碳负电极 (AC NE) 的可行性.
- 在一个实用,易于制造的设备中实现高能量密度,功率密度和长期稳定性.
主要方法:
- 使用活性炭作为负电极材料,在没有SEI层影响的情况下在宽潜在窗口 (3-0.05V与Na+/Na) 中工作.
- 制造了一个1.6Ah的离子电容器 (SIC) 袋式电池.
- 进行了电化学测试,包括循环稳定性,速度能力和安全评估 (指甲穿透,热逃跑).
主要成果:
- 该AC NE的超高电双层 (EDL) 电容储能容量为145 mAh g−1 (177 F g−1).
- 该SIC袋式电池提供了42Wh kg-1的高能量密度,在100°C充电率下达到57%的电荷状态 (SoC),并在10,000个循环中表现出稳定的循环运行.
- 该设备经过了严格的安全测试,并没有预先组装,大大降低了制造复杂性和成本.
结论:
- 开发的离子电容器代表了显著的进步,提供高能量密度与电容级功率密度,长期循环能力和简化组装相结合.
- 这项工作为下一代电化学电容器铺平了道路,提高了性能和制造可行性.
- 在组装过程中没有预化,这突出了更具成本效益和可扩展的能源存储设备制造方法.
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