强大的易斯酸协调PEO电解质实现4.8V级全固态电池超过580Whkg-1
Hanwen An1, Menglu Li1, Qingsong Liu1
1MOE Engineering Research Center for Electrochemical Energy Storage and Carbon Neutrality in Cold Regions, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, PR China.
Nature communications
|October 23, 2024
概括
这项研究使用易斯酸协调策略对聚乙烯氧化物 (PEO) 电解质来提高固态电池的性能. 这提高了先进电池应用中的高压稳定性和能量密度.
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
- 固态电池 固态电池是什么
背景情况:
- 聚乙烯氧化物 (PEO) 电解质对于固态电池至关重要,但在高电压下氧化阻力有限.
- 氧化阻力较差限制了高压电池可实现的能量密度和循环寿命.
研究的目的:
- 制定一项战略,以提高高压固态电池的PEO电解质的氧化抵抗和循环稳定性.
- 调查易斯酸协调改善电解质性能的机制.
主要方法:
- 使用Mg2+和Al3+的易斯酸协调策略被用于修改PEO电解质.
- 在固态电池中测试电解质,使用4.8V的富含Ni阴极.
- 制造了工业规模的电解质膜和Ah级囊细胞.
主要成果:
- 易斯酸协调显著改善了4.8V级PEO型电池的周期稳定性.
- 在以太氧链上减弱的电子密度限制了在高电荷状态下与阴极表面的有害相互作用.
- 电池在300个周期内实现了高压稳定性,并显示能量密度超过586Wh kg-1.1.
结论:
- 易斯酸协调策略有效地提高了用于高压固态电池的PEO电解质的性能.
- 该战略显示了实际应用的潜力,正如大型电池的成功制造所证明的那样,其稳定性和能量密度都很好.
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