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多功能TiN-MXene-Co@CNTs网络作为高实际容量的-硫电池的硫/主机

Xintao Zuo¹, Lufei Wang², Mengmeng Zhen²

¹Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education Institution, Beihang University, Beijing, 100191, P. R. China.

Angewandte Chemie (International ed. in English)

|June 13, 2024

概括

一种新的TiN-MXene-Co@CNTs材料有效地抑制了聚硫化物穿和硫电池中的树生长. 这种复合材料可实现高容量和长周期寿命,用于先进的电池应用.

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:

硫电池 (LSB) 面临着聚硫化物 (LiPS) 穿和树增长的挑战,这阻碍了实际应用.
缓慢的LiPS氧化还原动力学和不受控制的Li沉积阻碍了LSB的性能和周期寿命.

研究的目的:

开发一种多功能材料,解决LSB中的LiPS穿,氧化还原动力学和Li树突石问题.
通过协同材料设计,提高LSB的电化学性能和稳定性.

主要方法:

在现场合成碳纳米管 (CNTs) 在TiN-MXene纳米板上封装Co纳米粒子 (TiN-MXene-Co@CNTs).
使用TiN-MXene-Co@CNTs复合物作为硫阴极和阳极的双主机.
电化学表征包括循环性能,速率能力和涂/脱落试验.

主要成果:

TiN-MXene-Co@CNTs/S阴极在0.1°C下100个循环后达到1129.1mAhg-1的高可逆特异容量,硫载荷为2.5mg-2cm.
在1.0°C下,异常长周期寿命超过1000个周期被证明.
在高硫负载 (8.9 mg cm-2) 和低E/S比 (5.0 μL mg-1) 的情况下,达到6.3 mAh cm-2的高面积容量.
作为Li宿主的TiN-MXene-Co@CNTs表现出稳定的Li/剥离行为超过1000小时.

结论:

TiN-MXene-Co@CNTs复合物有效捕获LiPS,加速氧化还原转化,并促进同质的Li沉积.
开发的材料为高性能和持久的硫电池提供了有前途的解决方案.
复合材料的协同效应显著提高了LSB的电化学性能和稳定性.

关键词:

在Li2S的存储中,导电网络的导电网络是指导电网的导电网络.树的生长树的生长多硫化的聚硫化物硫电池是硫电池的一种.

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