安全和快速充电的金属电池的弱溶解电解质
Mingzhu Wu1, Mingchen Yang1, Jiangtao Yu1
1Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Negative Carbon Technologies College of Chemistry, Suzhou Key Laboratory of Soft Material and New Energy, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
研究人员开发了新的弱溶解电解质 (WSEs),用于更安全的高性能金属电池 (SMB). 这些电解质提高了离子动力学和电极接口稳定性,提高了电池的寿命和安全性.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 高性能金属电池 (SMB) 需要具有出色的电极兼容性,低溶解能量和不易燃性的电解质.
- 在中小企业中使用的传统碳酸电解质具有高的Na+溶解能量和不良的阳极兼容性,阻碍了性能并导致降解.
研究的目的:
- 设计和开发低溶解电解质 (WSEs),以提高金属电池的性能和安全性.
- 调查电解质中低溶解能量的电离以太诱导溶剂分子极化机制.
主要方法:
- 一个新的 WSE 设计,利用电离以太诱导的溶剂分子极化策略.
- 使用皮罗利丁来诱导固体阻碍和电子吸收效应,削弱溶解能力.
- 分析分子间极化相互作用以达到碳酸基电解质的低溶解能量.
主要成果:
- 开发的WSEs显示出快速的Na+迁移动力学和电场增强的电极/电解质接口.
- 在10C的500个循环后,Na3V2 ((PO4) 3电池的容量保持率为83.5% (CE平均值为99.69%).
- 在5C (CE平均值99.77%) 的4.5V 1000次循环后,Na2Fe2 ((SO4) 3) 电池保持了92.8%的容量保留,由于电离化以太而提高了安全性.
结论:
- 在高收费的情况下,WSE促进了中小企业的稳定性和可逆性.
- 通过消除火灾风险,以为基础的WSEs提供了安全的替代方案.
- 这项研究为设计高性能和安全的金属电池提供了宝贵的见解.
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