解开水性-MnO电池中的阳离子氧化解化学
Tianhao Wang1, Junteng Jin1, Xudong Zhao2
1Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.
Angewandte Chemie (International ed. in English)
|August 12, 2024
概括
这项研究引入了缺乏的二氧化 (MnO2) 阴极,用于水性离子电池 (AZIB) 的Ca2+支柱,使离子氧化还原反应具有高容量和长周期寿命.
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:
- 阳离子还氧反应 (ARR) 在/离子电池中具有高容量,但在水性离子电池 (AZIB) 中尚未得到充分探索.
- 基于二氧化 (MnO2) 的阴极对AZIBs很受欢迎,但它们对ARR的潜力仍未得到研究.
研究的目的:
- 探索激活离子氧化还原反应 (ARR) 在AZIBs的MnO2基阴极中的可能性.
- 开发一种新的MnO2阴极材料,以提高AZIBs的电化学性能和稳定性.
主要方法:
- 通过低温水热方法合成含缺少的MnO2微纳米球与Ca2+柱 (CaMnO-140).
- 在AZIBs中作为阴极的CaMnO-140的电化学表征.
- 先进的同步子表征和理论计算以阐明反应机制.
主要成果:
- CaMnO-140具有显著增强的速率能力 (485.4 mAh g-1 在0.1 A g-1,154.5 mAh g-1 在10 A g-1) 和长期循环稳定性 (90.6%的保留超过5000个循环).
- 该材料展示了可逆的氧氧氧化还原化学与CF3SO3-吸收/释放和氧化还原与H+/Zn2+联合插入/提取相结合.
- 袋式CaMnO-140//Zn电池显示出高能耗,寿命长,适应广泛温度和高安全性的潜力.
结论:
- 开发的CaMnO-140阴极成功地激活了AZIB中的阳离子氧化还原化学,克服了以前的限制.
- 这项工作为AZIBs设计高能阴极提供了一个新的策略,通过利用阳离子氧化还原.
- 这些发现为下一代具有改进性能特性的AZIB铺平了道路.
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