阳离子柱使高能量密度双离子电池具有超长周期寿命
Xikun Zhang1, Weibin Yan1, Jing Li1
1Laboratory of Inorganic Materials Chemistry (CMI), University of Namur, Namur, Belgium.
Angewandte Chemie (International ed. in English)
|February 2, 2026
概括
研究人员为双离子电池 (SDIB) 中的石墨阴极开发了一种离子柱策略. 这种方法增强了结构稳定性,改善了先进的能源存储的长期性能和能量密度.
科学领域:
- 储能材料 储能材料 储能材料
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
背景情况:
- 双离子电池 (SDIB) 提供低成本和高电压,但受到石墨阴极结构不稳定的影响.
- 这种不稳定性限制了长期的性能,并阻碍了大规模的SDIB应用.
- 开发稳定的阴极材料对于推进SDIB技术至关重要.
研究的目的:
- 引入一种新的离子柱策略,用于稳定SDIB中的石墨阴极.
- 为了提高石墨阴极的结构完整性和电化学性能.
- 为了克服电池循环期间石墨结构崩的局限性.
主要方法:
- 柱策略应用于石墨阴极的中间层.
- 电化学性能测试,包括特定容量和循环稳定性.
- 分析石墨结构内的离子柱的结构完整性和稳定性.
主要成果:
- 在200 mA g-1下达到162 mAh g-1的高特异容量,能量密度为560 Wh kg-1.
- 在2000mAg-1下维持了101mAhg-1的容量,在15500个循环后保持了74.0%的容量.
- 证明了特殊的长期稳定性,每个周期的低容量衰变率为0.0017%,稳定的离子柱.
结论:
- 离子柱策略有效地扩大和稳定石墨层间距,防止结构崩.
- 这种方法显著提高了SDIB的电化学性能和周期寿命.
- 为下一代储能系统开发高性能和耐用石墨阴极提出了一个有前途的战略.
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