Zn/V2O5 Aqueous Hybrid-Ion Battery with High Voltage Platform and Long Cycle Life
Zn/V2O5 Aqueous Hybrid-Ion Battery with High Voltage Platform and Long Cycle Life
复制标题
高电压平台、长循环寿命的Zn/V2O5水系混合离子电池
DOI：
10.1021/acsami.7b13110
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发表时间：
2017-12-13
影响因子：
9.5
通讯作者：
Mai, Liqiang
中科院分区：
文献类型：
--
作者：
Hu, Ping;Yan, Mengyu;Mai, Liqiang
由于其低成本、高安全性以及在固定能量存储方面的潜在应用，水基锌离子电池受到越来越多的关注。然而，同时实现高循环稳定性和高能量密度仍然是一个重大挑战。为了解决上述问题，我们开发了一种新型的Zn/V2 O 5可充电水溶液混合离子电池系统，采用多孔V2 O 5作为阴极，金属锌作为阳极。V2 O 5阴极在50 mA g（-1）下提供238 mAh g（-1）的高放电容量。在2000 mA·g（-1）的高电流密度下，经2000次循环后，其初始放电容量仍保持80%。同时，“盐包水”电解质的应用使放电平台从0.6 V增加到1.0 V。这项工作提供了一种有效的策略，可以同时提高水性锌离子电池的能量密度和循环稳定性。
Aqueous zinc-ion batteries attract increasing attention due to their low cost, high safety, and potential application in stationary energy storage. However, the simultaneous realization of high cycling stability and high energy density remains a major challenge. To tackle the above-mentioned challenge, we develop a novel Zn/V2O5 rechargeable aqueous hybrid-ion battery system by using porous V2O5 as the cathode and metallic zinc as the anode. The V2O5 cathode delivers a high discharge capacity of 238 mAh g(-1) at 50 mA g(-1). 80% of the initial discharge capacity can be retained after 2000 cycles at a high current density of 2000 mA g(-1). Meanwhile, the application of a "water-in-salt" electrolyte results in the increase of discharge platform from 0.6 to 1.0 V. This work provides an effective strategy to simultaneously enhance the energy density and cycling stability of aqueous zinc ion-based batteries.