Electrochemical Generation of Hydrated Zinc Vanadium Oxide with Boosted Intercalation Pseudocapacitive Storage for a High-Rate Flexible Zinc-Ion Battery
Electrochemical Generation of Hydrated Zinc Vanadium Oxide with Boosted Intercalation Pseudocapacitive Storage for a High-Rate Flexible Zinc-Ion Battery
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用于高倍率柔性锌离子电池的增强插层赝电容存储的电化学生成水合氧化锌钒
DOI：
10.1021/acsami.1c03194
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发表时间：
2021
影响因子：
9.5
通讯作者：
Luo Yanzhu
中科院分区：
文献类型：
--
作者：
Tao Yuanxue;Huang Dekang;Chen Hao;Luo Yanzhu
随着柔性可穿戴和可伸缩电子器件的迅猛发展，对具有优异电化学性能的柔性储能器件的需求也越来越大。为此，研制了一种以水合锌钒氧化物/碳布为正极的柔性锌离子电池，该电池具有能量密度高、寿命长、安全性好等优点。采用电化学方法将水合氧化钒/碳布(VOH/CC)原位转化为ZnVOH/CC，发现了其插层伪电容反应机理。在放电初期和高倍率电化学过程中，H+的插入占主导地位，而在随后的放电阶段和低速电化学过程中，锌离子的插入占主导地位。在20A·g~(-1)下，5000次循环后可获得135mAHg~(-1)的超稳可逆容量，而不会出现容量衰减。此外，组装后的柔性锌离子电池可以在轧制、折叠和冲压条件下正常工作，具有极高的安全性。经170次循环后，10Ag-1放电容量可达184mAg-1。这项工作为设计低成本、安全、快速充电的柔性电子产品储能装置提供了一条新的途径。
With the surging development of flexible wearable and stretchable electronic devices, flexible energy-storage devices with excellent electrochemical properties are in great demand. Herein, a flexible Zn-ion battery comprised by hydrated zinc vanadium oxide/carbon cloth (ZnVOH/CC) as the cathode is developed, and it shows a high energy density, superior lifespan, and good safety. ZnVOH/CC is obtained by the in situ transformation of hydrated vanadium oxide/carbon cloth (VOH/CC) by an electrochemical method, and the intercalation pseudocapacitive reaction mechanism is discovered for ZnVOH/CC. The co-insertion/deinsertion of H+/Zn2+is observed; the H+insertion dominates in the initial discharge stage and the high-rate electrochemical process, while Zn2+insertion dominates the following discharge stage and the low-rate electrochemical procedure. An ultrastable reversible capacity of 135 mAh g–1at 20 A g–1is obtained after 5000 cycles without capacity fading. Moreover, the as-assembled flexible zinc-ion battery can operate normally under rolled, folded, and punched conditions with superior safety. It is capable to deliver a high discharge capacity of 184 mAh g–1at 10 A g–1after 170 cycles. This work paves a new way for designing low-cost, safe, and quick-charging energy-storage devices for flexible electronics.