对快速充电离子电池混合石墨阳极的界面优化机制和定量分析
Haiqiang Gong1, Peng Du1, Bao Zhang1
1National Energy Metal Resources and New Materials Key Laboratory, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.
Journal of colloid and interface science
|September 20, 2024
概括
石墨阳极上的硬碳涂层通过增强扩散和减少容量退化,显著改善快速充电性能. 这种接口工程为先进的电池材料提供了一个有前途的战略.
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:
- 传统的石墨阳极受限于扩散动力学,在快速循环过程中导致容量降低.
- 提高石墨阳极快速充电性能需要进一步研究底层机制和接口设计.
研究的目的:
- 通过接口工程设计和合成硬碳涂涂石墨 (HCCG) 材料.
- 从石墨界面的角度阐明快速充电性能的优化机制.
主要方法:
- 通过简单的接口工程,合成硬碳涂层石墨 (HCCG) 材料.
- 电化学表征和计算以评估性能增强.
主要成果:
- HCCG阳极显示可逆含量增加了8%,交换电流密度增加了三倍.
- 桌面的斜率减少到四分之一,这表明快速充电期间电极极化明显降低.
- 在5C的1450个循环后保持了86.89%的容量保留,容量为202.3 mAhg-1.1.
结论:
- 硬碳涂层提供了丰富的间接通道和容纳空间,优化了快速充电性能.
- 涂层起到缓冲层的作用,减轻沉积造成的容量损失,并保持电化学接触.
- 结果为改善电池技术的石墨阳极接口的动态和结构优化提供了宝贵的见解.
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