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优秀的离子储存基于Sn的阳极,辅助导电混合缓冲矩阵

Jinsil Shin¹, Sung-Hoon Park², Jaehyun Hur¹

¹Department of Chemical and Biological Engineering, Gachon University, 1342 Seongnam-daero, Seongnam 13120, Republic of Korea.

Nanomaterials (Basel, Switzerland)

|October 27, 2023

概括

一种新的锡-二氧化碳 (Sn-TiO2-C) 复合物增强了离子电池阳极. 这种三元材料提高了循环稳定性和速度性能,解决了纯锡阳极的局限性.

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
纳米技术纳米技术

背景情况:

石墨是离子电池阳极的商业标准,但由于其高的理论容量,锡 (Sn) 显示出作为替代品的承诺.
然而,Sn阳极在电池运行过程中由于显著的体积变化和缓慢的电化学动力学造成的循环稳定性和速率性能不佳.
制定减轻这些问题的战略对于推进下一代能源存储至关重要.

研究的目的:

开发一种基于锡 (Sn) 结合二氧化 (TiO2) 和碳 (C) 的三元复合阳极材料,以克服纯Sn阳极的局限性.
研究Sn-TiO2-C复合物的结构和电化学特性.
为了评估复合材料的循环性能,速率能力和离子扩散动力学,作为离子电池的阳极.

主要方法:

合成Sn-TiO2-C三元复合物,使用两步高能球磨加工工艺.
复合材料的结构和形态的特征.
电化学测试,包括循环性能,速率能力和电化学阻抗光谱 (EIS) 来评估离子扩散动力学.

主要成果:

与Sn-TiO2和Sn-C二进制对应物相比,Sn-TiO2-C复合物显著提高了循环性能和速度能力.
在200 mA g−1的100个循环后达到669 mAh g−1的特定容量,在500 mA g−1的500个循环后达到651 mAh g−1的特定容量.
观察到优异的速率性能,容量为446mAhg-1在3000mAg-1.1时.
由于混合TiO2-C矩阵,EIS分析证实Sn-TiO2-C复合物的离子扩散动力学更快.

结论:

这种Sn-TiO2-C三元复合物有效地解决了Sn阳极的体积膨胀和电化学运动限制.
混合TiO2-C矩阵在稳定Sn电极和促进离子运输方面发挥着至关重要的作用.
这种复合材料显示出作为先进离子电池的高性能阳极的巨大潜力.

关键词:

离子电池是一种离子电池.阳极是一种极.混合的TiO2-C矩阵是混合的.三元复合材料三元复合材料

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