High-power and high-energy zinc ion cathodes through embedded CNTs current collectors in vanadium oxide

IF 5.5 3区 材料科学 Q1 ELECTROCHEMISTRY
Carolina Ramos Capón , Juan J. Vilatela , Afshin Pendashteh
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Abstract

Aqueous rechargeable zinc-ion batteries (ZIBs) represent a promising technology for increased adoption in various applications, especially for stationary energy storage purposes. Despite notable advancements in enhancing the capacity of electrode materials for ZIBs, the development of cathodes exhibiting high capacity at the electrode level, with application-relevant mass loadings and prolonged stability, remains challenging. Herein, we introduce composite electrodes consisting of vanadium oxide with an embedded conducting network of carbon nanotubes, reaching 96 wt.% of active material in the full electrode by eliminating binders and metallic foil. Embedding the CNT network results in flexible electrodes with a uniform distribution of active material, electrical conductivity of 3.5 × 103 S/m (e.g., 0.25 S/m out-of-plane) and high toughness. The resulting composite electrodes demonstrated a high capacity of 350 mAh/g at the electrode level, coupled with prolonged cycling performance both at low (e.g., 98 % retention over 240 at 0.1 A/g) and high current densities (e.g., 87 % over 1500 cycles at 5 A/g). The embedded conducting network within the electrode produces excellent high-rate properties up to 10 A/g (e.g., ∼170 mAh/g) due to the uniform distribution of active material and high internal electrical conductivity. Embedded CNT electrodes translate into a specific energy density of ∼ 290 Wh/kg at the electrode level, which is a 425 % increase compared to conventional ZIB cells with titanium or stainless-steel current collectors.
通过在氧化钒中嵌入碳纳米管集流器制备大功率高能锌离子阴极
水溶液可充电锌离子电池(zib)代表了一种有前途的技术,在各种应用中越来越多地采用,特别是在固定能量存储目的。尽管在提高zib电极材料的容量方面取得了显著进展,但在电极水平上表现出高容量的阴极的开发,具有应用相关的质量负载和长时间的稳定性,仍然具有挑战性。在此,我们引入了由氧化钒和嵌入碳纳米管导电网络组成的复合电极,通过消除粘合剂和金属箔,在整个电极中达到96 wt.%的活性物质。嵌入碳纳米管网络的结果是柔性电极具有均匀分布的活性材料,电导率为3.5×103 S/m(例如,0.25 S/m的面外)和高韧性。所得到的复合电极在电极水平上具有350 mAh/g的高容量,并且在低电流密度下(例如,在0.1 a /g下,超过240次的保留率为98%)和高电流密度下(例如,在5 a /g下,超过1500次的保留率为87%)具有长时间的循环性能。电极内的嵌入式导电网络由于活性材料的均匀分布和高内部导电性,可产生高达10 A/g(例如,~ 170 mAh/g)的优异高速率特性。嵌入的碳纳米管电极在电极水平上转化为约290 Wh/kg的比能量密度,与带有钛或不锈钢集流器的传统ZIB电池相比,增加了425%。
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来源期刊
Electrochimica Acta
Electrochimica Acta 工程技术-电化学
CiteScore
11.30
自引率
6.10%
发文量
1634
审稿时长
41 days
期刊介绍: Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.
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