一个独立的,溶解和扩散限制的,灵活的硫电极能够在高质量负载下实现高特异容量
Qianyi Guo1, Chao Wang2, Jian Shang1
1School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China.
Advanced materials (Deerfield Beach, Fla.)
|March 12, 2024
概括
研究人员开发了一种灵活的复合材料阴极,用于高容量硫 (Li-S) 电池. 这种创新的设计可以防止硫损失和聚硫化物扩散,在灵活的电池配置中实现稳定,高能量密度的性能.
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:
- 实现稳定,高面积容量的硫 (S) 阴极 (>10 mA h cm−2) 对于高能量密度的-硫 (Li-S) 电池至关重要.
- 增加硫阴极面积容量往往导致由于硫溶解和多硫化物扩散在厚电极中的特定容量和稳定性不佳.
研究的目的:
- 设计一个独立的复合阴极,具有3D共价结合点和化学吸附,以提高Li-S电池的性能.
- 为了应对高负荷电极中硫溶解和聚硫化物迁移的挑战.
主要方法:
- 使用3D共价结合点和化学吸附环境制造一个独立的复合阴极.
- 用开发的正极材料对硬币电池和袋式电池进行电化学测试.
- 通过曲测试评估自行车稳定性,特定容量,面积容量和灵活性.
主要成果:
- 复合阴极表现出极好的循环稳定性和1444.3 mA h g−1 (13 mA h cm−2) 的特定容量.
- 袋式电池的面积容量超过11 mA h cm−2,硫含量高达9.00 mg cm−2.2.
- 在连续曲周期中,阴极表现出了显著的灵活性和稳定性.
结论:
- 开发的独立的复合阴极有效地限制了硫溶解和聚硫化物扩散.
- 这种架构使高负载,灵活的Li-S电池具有特殊的能量密度和稳定性.
- 该研究为推进灵活的储能设备提供了一个基本策略.
相关概念视频
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