通过高效离子电池的热调节,具有量身定制的微观结构的硬碳
Pengcheng Mao1, Jie Di1, Yuqi Liu1
1Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), and Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
用于离子电池的松树皮衍生硬碳阳极显示了初始库伦比克效率和容量的改进. 调整缺陷创造了一个稳定的固体电解质间相,提高了循环性能.
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:
- 硬碳 (HC) 是离子电池 (SIB) 的领先阳极材料,由于其高容量,低电压和成本.
- 挑战包括初始库伦比克效率 (ICE) 低,储存机制不明确.
- 固体电解质间相 (SEI) 特性与电化学性能之间的联系尚不清楚.
研究的目的:
- 从松树皮中合成硬碳 (HC),可控制孔隙结构和缺陷度.
- 为了研究松树皮衍生的HC中储存机制.
- 阐明SIB中SEI特征与电化学性能之间的关系.
主要方法:
- 松树皮被用作通过精确的热调节进行硬碳合成的前体.
- 优化硬碳 (PHC-1300) 的特点是其微观结构和缺陷度.
- 在半细胞和全细胞 (PHC-1300//Na3V2(PO4)3) 中评估了电化学性能.
主要成果:
- 经过优化后的PHC-1300表现出89.6%的高ICE和0.1C时347.62mAhg-1的特定容量.
- 在PHC-1300//Na3V2(PO4)3全细胞中观察到出色的循环性能.
- 富含的有机SEI层形成在HC上,具有合适的缺陷,增强界面稳定性.
结论:
- 来自松树皮的硬碳为SIB提供了一个有希望的,低成本的阳极材料.
- 这种储存机制被提出为"吸附-间隙-填充".
- 控制的表面缺陷和SEI形成对于稳定和高性能离子电池至关重要.
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