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Intercalation-Type V2O3 with Fast Mg2+ Diffusion Kinetics for High-Capacity and Long-Life Mg-Ion Storage
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-21 , DOI: 10.1021/acssuschemeng.0c04734 Cunyuan Pei 1 , Mengda Jin 1 , Yameng Yin 1 , Fangyu Xiong 1 , Yalong Jiang 1 , Xiaofang Yuan 2 , Fang Wang 3 , Qinyou An 1, 4
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-21 , DOI: 10.1021/acssuschemeng.0c04734 Cunyuan Pei 1 , Mengda Jin 1 , Yameng Yin 1 , Fangyu Xiong 1 , Yalong Jiang 1 , Xiaofang Yuan 2 , Fang Wang 3 , Qinyou An 1, 4
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V2O3 is a promising electrode material because of its large tunnel structure consisted of a 3D V–V network, and it exhibits various alkali-metal-ion storage mechanisms with high theoretical capacity. However, the daunting challenges to its further development are the poor conductivity and large volume change during cycling. In this paper, the unique structure of three-dimensional reduced graphene oxide (rGO) network-supported V2O3 nanoparticles has been prepared and employed as the cathode material for magnesium-ion batteries. With enhanced conductivity and structural stability, V2O3@rGO achieves a high specific capacity (291.3 mAh g–1), enhanced rate performance (185.3 mAh g–1 at a high current density of 2 A g–1), and excellent cycling stability (an 88.5% capacity retention after 1000 cycles at 0.5 A g–1). In addition, the detailed investigations reveal the reversible intercalation Mg-storage mechanism, volume expansion, and the locations of the inserted Mg ions in V2O3. The excellent electrochemical performance and highly reversible intercalation mechanism indicate that the constructed V2O3@rGO is a promising candidate for Mg-ion storage.
中文翻译：
插层式V 2 O 3具有快速的Mg 2+扩散动力学，可实现高容量和长寿命的镁离子存储
V 2 O 3是一种很有前途的电极材料，因为它的大型隧道结构由3D V–V网络组成，并且具有各种具有高理论容量的碱金属离子存储机制。然而，其进一步发展的艰巨挑战是电导率低和循环期间体积变化大。本文制备了三维还原氧化石墨烯（rGO）网络支撑的V 2 O 3纳米颗粒的独特结构，并将其用作镁离子电池的正极材料。V 2 O 3 @rGO具有增强的导电性和结构稳定性，可实现高比容量（291.3 mAh g –1），增强的倍率性能（在2 A g –1的高电流密度下为185.3 mAh g –1）和出色的循环稳定性（在0.5 A g –1的1000次循环后，容量保持率为88.5％）。另外，详细的研究揭示了可逆的嵌入Mg储存机理，体积膨胀以及V 2 O 3中插入的Mg离子的位置。优异的电化学性能和高度可逆的嵌入机制表明，所构建的V 2 O 3 @rGO是用于Mg离子存储的有希望的候选者。
更新日期：2020-11-02
中文翻译：
插层式V 2 O 3具有快速的Mg 2+扩散动力学，可实现高容量和长寿命的镁离子存储
V 2 O 3是一种很有前途的电极材料，因为它的大型隧道结构由3D V–V网络组成，并且具有各种具有高理论容量的碱金属离子存储机制。然而，其进一步发展的艰巨挑战是电导率低和循环期间体积变化大。本文制备了三维还原氧化石墨烯（rGO）网络支撑的V 2 O 3纳米颗粒的独特结构，并将其用作镁离子电池的正极材料。V 2 O 3 @rGO具有增强的导电性和结构稳定性，可实现高比容量（291.3 mAh g –1），增强的倍率性能（在2 A g –1的高电流密度下为185.3 mAh g –1）和出色的循环稳定性（在0.5 A g –1的1000次循环后，容量保持率为88.5％）。另外，详细的研究揭示了可逆的嵌入Mg储存机理，体积膨胀以及V 2 O 3中插入的Mg离子的位置。优异的电化学性能和高度可逆的嵌入机制表明，所构建的V 2 O 3 @rGO是用于Mg离子存储的有希望的候选者。
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