紧密结合和双封装使得稳定的厚/碳阳极具有超高体积容量,可用于储存
Wen Zhang1, Siwei Gui1, Zihan Zhang1
1Department of Mechanics, School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
Small (Weinheim an der Bergstrasse, Germany)
|July 31, 2023
概括
研究人员开发了一种用于离子电池 (LIB) 的新复合体阳极. 这种材料克服了.
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) 是一个非常有前途的阳极材料,用于高性能离子电池 (LIBs) 由于其高理论容量.
- 阳极的主要挑战包括内部导电性差以及在化/脱过程中体积的显著变化,导致结构退化.
- 解决这些问题对于在不牺牲能量密度的情况下,在先进的LIB中实践应用Si至关重要.
研究的目的:
- 提出一个整合策略,准备一种复合阳极材料,以提高电导率和抗变形能力.
- 为了使阳极在LIBs的厚电极配置中的实际应用.
- 为了在LIB中实现高能量密度和稳定的循环性能,使用阳极.
主要方法:
- 开发一个紧的微米大小的Si@G/CNF@NC复合材料,具有双封装架构.
- 制造具有超高质量负载 (10.8 mg cm−2) 的厚电极.
- 使用开发的Si阳极和LiNi0.95Co0.02Mn0.03O2阴极组装和测试袋式全电池.
主要成果:
- Si@G/CNF@NC复合材料具有卓越的导电性和抗变形性.
- 电极表现出极好的循环稳定性和良好的速率性能,即使在高质量负载下.
- 最初的面积容量达到了16.7 mA h cm−2 (2197.7 mA h cm−3体积容量).
- 充满电池显示竞争力的重力测量能量密度为≈459.1 Wh kg-1和体积能量密度为≈1235.4 Wh L-1.1.
结论:
- 拟议的整合战略有效地减轻了与LIB中的阳极相关的挑战.
- 开发的Si@G/CNF@NC复合材料使高性能厚电极具有出色的稳定性和能量密度.
- 这项工作为下一代LIB中高能量密度阳极的实际应用铺平了道路.
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