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软而硬的战略通过化学剪切促进快速和高容量的储存

Yuanxia Zhang¹, Chenlong Dong^1,2, Chong Zheng³

¹Tianjin Key Laboratory for Photoelectric Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, P.R. China.

Inorganic chemistry

|June 5, 2024

概括

研究人员开发了一种基于Sn的新型阳极材料 (Sn_1.2Ti_0.8S₃) 用于离子电池 (LIB). 这种材料实现了高容量和出色的速率能力,克服了电池性能以前的限制.

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:

高能和高功率的离子电池 (LIB) 需要同时大量的储存和快速充/放电能力,这是很难实现的.
锡 (Sn) 基材料为LIB阳极提供了高的理论容量和低的工作潜力,但遭受了显著的体积膨胀和颗粒聚合,限制了它们的稳定性和速度性能.
现有的阳极材料难以平衡高容量和快速充/放电速度,阻碍了先进的LIBs的发展.

研究的目的:

设计和合成一种新的阳极材料,克服了LIBs中传统的Sn基阳极的局限性.
通过独特的结构设计,在LIB阳极中实现同时高的特定容量和出色的速率能力.
通过控制结构单元来证明一种提高LIB阳极电化学性能的新策略.

主要方法:

采用"软硬"的概念,使用化学剪刀打破Ti-S键,创建1D链状Sn_1.2Ti_0.8S₃的松散堆叠结构.
在现场和现场 (微) 结构特征进行了分析材料的结构和体积膨胀缓解的机制.
进行了电化学性能测试,包括循环稳定性和速率能力测量,以评估阳极的有效性.

主要成果:

合成的Sn_1.2Ti_0.8S₃材料有效地在刚性Ti-S框架内分散Sn域,减轻体积膨胀和粒子聚合.
阳极在100个循环后在0.1 A g-1下表现出963.2 mA h g-1的高特异容量.
证明了特殊的速率能力,可逆容量为250mA hg-1在3900个循环后保持在10A g-1的高电流密度下.

结论:

开发的Sn_1.2Ti_0.8S₃阳极材料成功地将Sn的高容量与TiS_{2的高速率性能相结合.}
通过结构单元级别的化学定制实现的"软硬"策略,有效地提高了LIB阳极的周期稳定性和速率能力.
这种方法为设计下一代高能和高功率LIB的先进阳极材料提供了一个有前途的途径.

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