软硬异构结构,具有功能性空位,用于快速充电和高容量储存
Yu Su1,2,3, Bernt Johannessen4, Shilin Zhang5
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Advanced materials (Deerfield Beach, Fla.)
|August 2, 2023
概括
一种具有双空位的新型软刚性硫化物/二硫化物异构结构增强了离子电池阳极. 这种设计改善了电荷传输和结构稳定性,以获得卓越的储能性能.
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:
- 优化电荷传输和管理体积扩张是开发用于储能高性能电极材料的关键挑战.
- 离子电池 (SIB) 是离子电池的有希望的替代品,但需要先进的阳极材料来提高性能.
研究的目的:
- 构建一个原子薄的软硬Co9S8@MoS2核心外异构结构,具有双离子空位 (VCo和VMo),用于作为SIB中的高性能阳极.
- 研究独特的异构结构和空缺对电荷转移动力学和结构稳定性的影响.
主要方法:
- 合成一个Co9S8@MoS2核心外的异构结构,具有双离子空缺.
- 电化学测试,包括循环性能和速率能力测量.
- 理论计算以了解离子转移机制和结构行为.
主要成果:
- Co9S8@MoS2异构结构由于柔软的MoS2外和双空位而表现出极好的Na+转移动力学.
- 刚性Co9S8核心有效地抑制了充电和放电期间的结构变形.
- 这种材料在500个周期以5.0 A g-1进行后,产生了389.7 mAh g-1的高可逆容量.
- 使用这种阳极的完整电池在0.5°C时达到235.5 Wh kg-1的能量密度.
结论:
- 具有双离子空位的软刚性异构结构设计是提高离子电池阳极性能的一种高度有效的策略.
- 这种方法提高了电荷转移和结构完整性,从而提高了电化学性能.
- 这些发现为设计下一代储能系统的先进材料提供了新的途径.
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