Mott–Schottky Effect in Core–Shell W@WxC Heterostructure: Boosting Both Electronic/Ionic Kinetics for Lithium Storage,Small

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Mott–Schottky Effect in Core–Shell W@WxC Heterostructure: Boosting Both Electronic/Ionic Kinetics for Lithium Storage
Small ( IF 13.0 ) Pub Date : 2023-05-11 , DOI: 10.1002/smll.202300955
Yao Yang ₁ , Bing Sun ₂ , Yinhong Gao ₁ , Hui Zhu ₁ , Yongting Chen ₁ , Xuanke Li ₁ , Qin Zhang ₁

Affiliation

The dynamics rate of traditional metal carbides (TMCs) is relatively slow, severely limiting its fast-charging capacity for lithium-ion batteries (LIBs). Herein, the core–shell W@W_xC heterostructure is developed to form Mott–Schottky heterostructure, thereby simultaneously accelerating the electronic and ionic transport kinetics during the charging/discharging process. The W nanoparticles are partially reduced into W_xC to form a particular core–shell structure with abundant heterogeneous interfaces. Benefiting from the Mott–Schottky effect, the electrons at the metal/semiconductor heterointerface can migrate spontaneously to realize an equal work function on both sides. In addition, the independent nanoparticle as well as the unique core–shell structure facilitate the ionic diffusion kinetics. As expected, the W@W_xC electrode exhibits excellent electrochemical stability for LIBs, whose capacity can be maintained at 173.8 mA h g⁻¹ after 1600 cycles at a high current density of 5 A g⁻¹. When assembled into a full cell, it can achieve an energy density of 360.2 Wh kg⁻¹. This work presents a new avenue to promote the electronic and ionic kinetics for LIBs anodes by constructing the unique Mott–Schottky heterostructure.

中文翻译：

核壳W@WxC异质结构中的莫特-肖特基效应：增强锂存储的电子/离子动力学

传统金属碳化物（TMC）的动态速率相对较慢，严重限制了其对锂离子电池（LIB）的快速充电能力。在此，开发了核壳W@W _{x C异质结构以形成莫特-肖特基异质结构，从而同时加速充电/放电过程中的电子和离子传输动力学。}W纳米粒子部分还原成W _x C，形成具有丰富异质界面的特殊核壳结构。受益于莫特-肖特基效应，金属/半导体异质界面上的电子可以自发迁移，实现两侧相同的功函数。此外，独立的纳米颗粒以及独特的核壳结构有利于离子扩散动力学。正如预期的那样，W@W _x^{C电极对LIB表现出优异的电化学稳定性，在5 A g -1}的高电流密度下循环1600次后，其容量仍可保持在173.8 mA hg ^-1。当组装成全电池时，其能量密度可以达到360.2 Wh kg ^-1。这项工作通过构建独特的莫特-肖特基异质结构，为促进锂离子电池阳极的电子和离子动力学提供了一条新途径。

更新日期：2023-05-11

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