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功能化的Janus结构Ti₂B₂揭示了离子电池阳极的特殊容量和性能

Zhiqiang Lu¹, Yuchong Kang¹, Yingjie Du²

¹Ningxia Key Laboratory of Photovoltaic Materials, School of Materials and New Energy, Ningxia University, Yinchuan 750021, China.

Journal of colloid and interface science

|February 4, 2024

概括

使用Ti2B2NO对Janus结构的MBenes进行功能化,显著提高了离子电池的阳极容量. 这种材料提供了2.4倍更高的理论特异容量和改进的离子扩散,以提高电池性能.

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
纳米技术纳米技术

背景情况:

离子电池 (LIB) 对于储能至关重要,推动了对先进阳极材料的需求.
像Ti2B2这样的二维MBenes对LIB阳极有前途,但其存储容量有限.
探索了表面功能化,以克服MBenes中的局限性,以提高LIB性能.

研究的目的:

研究功能化的Janus结构MBenes (Ti2B2XaXb) 作为LIBs的高性能阳极材料的潜力.
探索不同表面功能组 (N,O,S,Se) 对Ti2B2.2.的电化学性质的影响.
了解在功能化的MBenes中控制储存的原子尺度机制.

主要方法:

基于密度函数理论 (DFT) 的第一原则模拟被采用.
系统地研究了Ti2B2XaXb的几何特征和电化学特性.
计算了理论特定容量,离子扩散屏障和开放电路电压.

主要成果:

Ti2B2NO的理论特异容量高达1091.17 mAh·g-1,比原始的Ti2B2增加了2.4倍.
在Ti2B2NO的O端的低扩散屏障 (0.33 eV) 有助于快速充/放电.
Ti2B2NO在安全电压范围 (0-1 V) 内工作,确保电池的运行安全.

结论:

斯结构的MBenes的表面功能化,特别是Ti2B2NO,显著增加了储能.
Ti2B2NO的低扩散屏障和安全工作电压使其成为下一代LIB阳极的有希望的候选者.
这项研究为为先进的储能应用量身定制MBenes提供了基本的见解.

关键词:

极材料是一种极材料.电化学性能电化学性能电化学性能第一个原则计算计算.雅努斯·贝内斯 (Janus MBenes) 是一个著名的作家.离子电池是一种离子电池.表面功能化的功能化

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