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Ultrasmall, Amorphous V2O3 Intimately Anchored on a Carbon Nanofiber Aerogel Toward High-Rate Zinc-Ion Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-04-04 , DOI: 10.1021/acsami.3c19533
Huifa Shi 1, 2 , Jiakai Cao 1, 2 , Weiyi Sun 1, 2 , Guixia Lu 3 , Hongbo Lan 1 , Lei Xu 4 , Zahid Ali Ghazi 5 , Dinghui Fan 6 , Zongyu Mao 7 , Daliang Han 6 , Wenbao Liu 8 , Shuzhang Niu 7
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-04-04 , DOI: 10.1021/acsami.3c19533
Huifa Shi 1, 2 , Jiakai Cao 1, 2 , Weiyi Sun 1, 2 , Guixia Lu 3 , Hongbo Lan 1 , Lei Xu 4 , Zahid Ali Ghazi 5 , Dinghui Fan 6 , Zongyu Mao 7 , Daliang Han 6 , Wenbao Liu 8 , Shuzhang Niu 7
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When considered as a cathode candidate for aqueous Zn-ion batteries, V2O3 faces several problems, such as inherently unsuitable structure, fast structural degradation, and sluggish charge transport kinetics. In this paper, we report the synthesis of a V2O3 intimately coupled carbon aerogel by a controllable ion impregnation and solid-state reaction strategy using bacterial cellulose and ammonium metavanadate as raw materials. In this newly designed structure, the carbonized carbon fiber network provides fast ion and electron transport channels. More importantly, the cellulose aerogel functions as a dispersing and supporting skeleton to realize the particle size reduction, uniform distribution, and amorphous features of V2O3. These advantages work together to realize adequate electrochemical activation during the initial charging process and shorter transport distance and faster transport kinetics of Zn2+. The batteries based on the V2O3/CNF aerogel exhibit a high-rate performance and an excellent cycling stability. At a current density of 20 A g–1, the V2O3/CNF aerogel delivers a specific capacity of 159.8 mAh g–1, and it demonstrates an exceptionally long life span over 2000 cycles at 12 A g–1. Furthermore, the electrodes with active material loadings as high as 10 mg cm–2 still deliver appreciable specific capacities of 257 mAh g–1 at 0.1 A g–1.
中文翻译：
超小型非晶态 V2O3 紧密锚定在碳纳米纤维气凝胶上，用于高倍率锌离子电池
当被视为水性锌离子电池的阴极候选材料时，V 2 O 3面临着几个问题，例如固有的不合适的结构、快速的结构退化和缓慢的电荷传输动力学。在本文中，我们报道了以细菌纤维素和偏钒酸铵为原料，通过可控离子浸渍和固态反应策略合成了V 2 O 3紧密耦合碳气凝胶。在这种新设计的结构中，碳化碳纤维网络提供了快速的离子和电子传输通道。更重要的是，纤维素气凝胶作为分散和支撑骨架，实现了V 2 O 3的粒径减小、分布均匀、无定形等特性。这些优点共同作用，实现了初始充电过程中充分的电化学活化以及Zn 2+的更短的传输距离和更快的传输动力学。基于V 2 O 3 /CNF气凝胶的电池表现出高倍率性能和优异的循环稳定性。在20 A g –1的电流密度下，V 2 O 3 /CNF 气凝胶的比容量为159.8 mAh g –1 ，并且在12 A g –1下表现出超过2000次循环的超长寿命。此外，活性材料负载量高达 10 mg cm –2的电极在 0.1 A g –1电流下仍具有 257 mAh g –1的可观比容量。
更新日期：2024-04-04
中文翻译：
超小型非晶态 V2O3 紧密锚定在碳纳米纤维气凝胶上，用于高倍率锌离子电池
当被视为水性锌离子电池的阴极候选材料时，V 2 O 3面临着几个问题，例如固有的不合适的结构、快速的结构退化和缓慢的电荷传输动力学。在本文中，我们报道了以细菌纤维素和偏钒酸铵为原料，通过可控离子浸渍和固态反应策略合成了V 2 O 3紧密耦合碳气凝胶。在这种新设计的结构中，碳化碳纤维网络提供了快速的离子和电子传输通道。更重要的是，纤维素气凝胶作为分散和支撑骨架，实现了V 2 O 3的粒径减小、分布均匀、无定形等特性。这些优点共同作用，实现了初始充电过程中充分的电化学活化以及Zn 2+的更短的传输距离和更快的传输动力学。基于V 2 O 3 /CNF气凝胶的电池表现出高倍率性能和优异的循环稳定性。在20 A g –1的电流密度下，V 2 O 3 /CNF 气凝胶的比容量为159.8 mAh g –1 ，并且在12 A g –1下表现出超过2000次循环的超长寿命。此外，活性材料负载量高达 10 mg cm –2的电极在 0.1 A g –1电流下仍具有 257 mAh g –1的可观比容量。
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