Electrolyte Concentration Regulation Boosting Zinc Storage Stability of High-Capacity K(0.486)V(2)O(5) Cathode for Bendable Quasi-Solid-State Zinc Ion Batteries.
Electrolyte Concentration Regulation Boosting Zinc Storage Stability of High-Capacity K(0.486)V(2)O(5) Cathode for Bendable Quasi-Solid-State Zinc Ion Batteries.
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电解质浓度调节提高可弯曲准固态锌离子电池高容量K0.486V2O5正极的锌存储稳定性
DOI：
10.1007/s40820-020-00554-7
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发表时间：
2021-01-04
影响因子：
26.6
通讯作者：
Liu J
中科院分区：
文献类型：
--
作者：
Li L;Liu S;Liu W;Ba D;Liu W;Gui Q;Chen Y;Hu Z;Li Y;Liu J
中等浓度的ZnCl 2（15 μ m）被认为是有效的抑制溶解的钒酸盐阴极，这是更稳定的，比30 μ m的“盐包水”电解质的离子电导率高4倍。首次选用层间距为~ 0.95 nm的K0.486V2O5材料组装水溶液锌离子电池，获得了优异的倍率性能和高能量、功率密度。设计了一种新型羧甲基纤维素钠-15 m ZnCl 2水凝胶电解质，其离子电导率高达10.08 mS cm−1，使可弯曲的锌离子电池具有出色的耐温耐压性。本文的在线版本（10.1007/s40820-020-00554-7）包含补充材料，可供授权用户使用。钒基正极材料因其容量大、倍率性能好、易于大规模合成等优点，在锌离子电池中引起了人们极大的兴趣。然而，它们的实际应用极大地阻碍了钒在常规稀电解质中的溶解问题。本文以一种大层间距（~ 0.95 nm）、高容量的新型钒酸钾K0.486V2O5（KVO）阴极为例，提出通过调节ZnCl 2电解液的浓度，可以大幅度提高钒酸盐在AZIBs中的循环寿命，而不需要接近“盐包水”阈值。在优化的15 m ZnCl 2电解液浓度下，KVO具有最佳的循环稳定性，1400次循环后容量保持率为95.02%。我们进一步设计了一种新型的羧甲基纤维素钠（CMC）-中等浓度的ZnCl 2凝胶电解质，首次具有10.08 mS cm−1的高离子电导率，并组装了准固态AZIB。该器件可弯曲，具有显著的能量密度（268.2 Wh kg−1），出色的稳定性（2800次循环后为97.35%），低自放电率和良好的环境（温度，压力）适应性，并能够为小型电子设备供电。该器件还表现出良好的电化学性能，具有高KVO质量负载（5和10 mg cm-2）。我们的工作揭示了使用中等浓度的电解质来解决水溶性电极材料的稳定性问题的可行性。本文的在线版本（10.1007/s40820-020-00554-7）包含补充材料，可供授权用户使用。
Moderate-concentration ZnCl2 (15 m) was found to be effective for suppressing the dissolution of vanadate cathode, which was more stable and had 4 times higher ionic conductivity than 30 m “water-in-salt” electrolyte. K0.486V2O5 with huge interlayer space of ~ 0.95 nm was chosen for the first time to assemble aqueous Zn ion batteries, giving rise to excellent rate performance and high energy and power densities. A novel sodium carboxymethyl cellulose-15 m ZnCl2 hydrogel electrolyte with high ionic conductivity of 10.08 mS cm−1 was designed, enabling a bendable Zn ion battery with outstanding resistance to temperature and pressure. The online version of this article (10.1007/s40820-020-00554-7) contains supplementary material, which is available to authorized users. Vanadium-based cathodes have attracted great interest in aqueous zinc ion batteries (AZIBs) due to their large capacities, good rate performance and facile synthesis in large scale. However, their practical application is greatly hampered by vanadium dissolution issue in conventional dilute electrolytes. Herein, taking a new potassium vanadate K0.486V2O5 (KVO) cathode with large interlayer spacing (~ 0.95 nm) and high capacity as an example, we propose that the cycle life of vanadates can be greatly upgraded in AZIBs by regulating the concentration of ZnCl2 electrolyte, but with no need to approach “water-in-salt” threshold. With the optimized moderate concentration of 15 m ZnCl2 electrolyte, the KVO exhibits the best cycling stability with ~ 95.02% capacity retention after 1400 cycles. We further design a novel sodium carboxymethyl cellulose (CMC)-moderate concentration ZnCl2 gel electrolyte with high ionic conductivity of 10.08 mS cm−1 for the first time and assemble a quasi-solid-state AZIB. This device is bendable with remarkable energy density (268.2 Wh kg−1), excellent stability (97.35% after 2800 cycles), low self-discharge rate, and good environmental (temperature, pressure) suitability, and is capable of powering small electronics. The device also exhibits good electrochemical performance with high KVO mass loading (5 and 10 mg cm−2). Our work sheds light on the feasibility of using moderately concentrated electrolyte to address the stability issue of aqueous soluble electrode materials. The online version of this article (10.1007/s40820-020-00554-7) contains supplementary material, which is available to authorized users.
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