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Ze Chen¹, Shengnan Wang¹, Zhiquan Wei¹

¹Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong 999077, China.

Journal of the American Chemical Society

|September 6, 2023

概括

研究人员使用化物电解质激活 (Te) 阴极,从而实现更高的电压和容量. 一种经过修改的离子液体电解质进一步提高了囊细胞的性能.

科学领域:

材料科学
电化学
能量储存

背景情况:

石化物,特别是 (Te),由于它们的高能量密度,可以作为电池 (ZB) 的转换阴极.
当前 Te 阴极受到低电压平原 (∼0.59 V) 的限制,因为它们的转换反应仅限于 Te2-/Te0.
这阻碍了基于Te的ZB向更高的输出电压和能量密度发展.

研究的目的:

在电池中激活完全可逆的氧还原行为 (Te^2-/Te⁰/Te²⁺/Te⁴⁺).
克服目前基于Te的ZB的低电压和能量密度的局限性.
提高 ZB 中 Te 阴极的稳定性和循环性能.

主要方法:

使用含有高度离子的电解质来激活Te2-/Te0/Te2+/Te4+氧化还原反应.
使用改性离子液体 (IL) 电解质来提高物种的稳定性和循环性能.
制造和测试400 mAh级袋式电池,用于高性能评估.

主要成果:

成功激活可逆Te2-/Te0/Te2+/Te4+氧化还原器,可传输多达6个电子.
实现了1.24,0.77和0.51V的三个平面放电平原,总容量为802.7mAhg/s.
展示了高性能ZnTe电池,具有高面积容量 (7.13 mAh cm^-2),能量密度 (542 Wh kg_{Te^-1),优异的循环,以及在袋式电池中低自放电.}

结论:

该研究成功地使用化电解质激活了电极的全氧化还原潜力.
改性离子液体电解质显著提高了ZnTe电池的稳定性和性能,实现了高能量密度和循环稳定性.
这项工作为开发基于转换阴极的先进高性能电池提供了有前途的途径.

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