简单而安全的合成黄皮结构/碳复合材料,具有增强的电化学性能
Jinhuan Li1,2, Min Wu1, Quan Du1
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Molecules (Basel, Switzerland)
|March 28, 2024
概括
研究人员开发了一种用于高能离子电池 (LIB) 的新型碳复合体阳极. 这种黄结构增强了稳定性和导电性,克服了.
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:
- (Si) 为先进的离子电池 (LIB) 提供了高的理论容量.
- 阳极由于体积膨胀大,电导率低,因此电化学稳定性不佳.
- 现有的阳极制造方法通常涉及有毒和腐蚀性试剂,如酸 (HF).
研究的目的:
- 开发一种稳定且导电的基于的阳极材料,用于高能量密度LIBs.
- 为了应对阳极体积膨胀和导电性的挑战.
- 在复合阳极制造中使用更安全,更少腐蚀的模板方法.
主要方法:
- 使用锡 (Sn) 作为模板合成黄皮Si-碳复合物 (Si@void@C).
- 在纳米Si上形成氧化 (SnO2) 涂层,通过化,然后通过HCl蚀刻去除模板.
- 应用高导电性碳层,从中提取,以增强电气性能.
主要成果:
- 蛋黄外结构有效地适应Si体积变化,并改善Li+/电子导电性.
- 合成的Si@void@C复合物表现出了出色的电化学性能.
- 在1.0 A g-1下100个周期后,735.3 mAh g-1的放电容量被保留了,在2.0 A g-1下1238.5 mAh g-1被保留了.
结论:
- 开发的黄皮Si-碳复合材料是高能LIB的有前途的阳极材料.
- 使用Sn和HCl的模板方法为基于HF的工艺提供了更安全的替代方案.
- Si@void@C结构显著提高了阳极的电化学稳定性和性能.
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