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在石墨阳极中百分比之间的关系,以实现高能量密度的离子电池

Manoj Gautam¹, Govind Kumar Mishra¹, K Bhawana¹

¹Electrochemical Energy Storage Laboratory, Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

ACS applied materials & interfaces

|August 22, 2024

概括

在阳极中优化 (Si) 和石墨 (Gr) 的比率可以提高离子电池的能量密度. 15%的Si/Gr阳极显示出更好的容量和稳定性,为商业可行性铺平了道路.

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:

在石墨 (Gr) 阳极中的高重量百分比 (Si) 对离子电池 (LIB) 构成商业化挑战.
优化Si/Gr比率对于使用现有制造线制造高能量密度LIB至关重要.
现有的文献缺乏对最佳Si/Gr比率的彻底研究.

研究的目的:

系统地评估商业石墨中的Si含量 (5-20%),以优化Si/Gr比率.
提高特定容量,同时减轻Si的局限性,如周期稳定性和第一周期不可逆转的容量损失.
为Si/Gr复合阳极的商业可行性提供见解.

主要方法:

在商业石墨中系统评估Si含量 (5-20%).
在现场的电化学阻抗光谱用于接口分析.
速率能力评估 (高达3C速率),扩散系数测量和循环稳定性评估.

主要成果:

将Si含量提高到15% (Si₁₅Gr₇₅) 显著提高了化/脱化能力,分别提高了16.8%和16.0%.
15Gr75阳极实现了初始库伦比效率约为82.9%,相当于纯石墨.
观察到卓越的循环稳定性,在0.5°C的215个循环后保持约60%的容量,与NMC622.22相比,具有强大的全细胞性能.

结论:

优化的Si₁₅Gr₇₅阳极组合为高能量密度LIB提供了一个可行的途径.
这项研究为先进的Si/Gr复合阳极的商业开发提供了关键数据.
这些发现突显了Si/Gr阳极在下一代储能解决方案中的潜力.

关键词:

扩散系数扩散系数全细胞研究的研究.最初的库伦比克效率.利率能力利率能力 - 石墨 - 石墨 - 石墨

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