高强度阳极通过压缩碳化为液态和全固态离子电池提供高密度
Rui Qiao1, Xuefeng Shen1, Caiwang Mao1
1State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, Xi'an Jiaotong University, Xi'an 710049, China.
Nano letters
|November 27, 2024
概括
研究人员开发了一种新-石墨复合体阳极,克服了低密度和胀的问题. 这种集成电极设计提高了电池性能和稳定性,用于实际的离子电池应用.
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:
- 纳米结构为离子电池提供了高容量,但由于自来水密度低和膨胀高,限制了实际使用.
- 现有的独立电极往往无法平衡容量,循环寿命和体积能量密度.
研究的目的:
- 设计和制造一个独立的-石墨复合材料集成阳极,可提高自来水密度和减少胀.
- 为了评估液态和全固态离子电池中集成阳极的电化学性能和稳定性.
主要方法:
- 压力下的和石墨与的一烧结.
- 使用热力学效应进行压缩碳化.
- 在现场扩张测量.
- 在液态和全固态电池配置中的电化学循环测试.
主要成果:
- 达到1.51gcm-3的高接密度,是典型的独立电极的两倍多.
- 显著减少了纵向扩张 (<20%的常规电极).
- 显示了显著的循环稳定性:在500个循环 (液体) 后保持77.6%的容量,在1000个循环 (全固态) 后保持98.5%.
- 在12.6 mAh cm−2.2 的高面积容量下保持稳定性.
结论:
- 开发的集成-石墨阳极有效地解决了纳米结构的局限性.
- 简单的制造方法和增强的性能使得高性能离子电池的实际应用成为可能.
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