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Conversion Synthesis of Self-Standing Potassium Zinc Hexacyanoferrate Arrays as Cathodes for High-Voltage Flexible Aqueous Rechargeable Sodium-Ion Batteries.
Small ( IF 13.0 ) Pub Date : 2019-11-26 , DOI: 10.1002/smll.201905115 Bing He 1, 2, 3 , Ping Man 1, 2 , Qichong Zhang 4 , Chao Wang 1, 2 , Zhenyu Zhou 1, 2 , Chaowei Li 1, 2 , Lei Wei 4 , Yagang Yao 1, 3, 5
Small ( IF 13.0 ) Pub Date : 2019-11-26 , DOI: 10.1002/smll.201905115 Bing He 1, 2, 3 , Ping Man 1, 2 , Qichong Zhang 4 , Chao Wang 1, 2 , Zhenyu Zhou 1, 2 , Chaowei Li 1, 2 , Lei Wei 4 , Yagang Yao 1, 3, 5
Affiliation
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Prussian blue analogs exhibit great promise for applications in aqueous rechargeable sodium-ion batteries (ARSIBs) due to their unique open framework and well-defined discharge voltage plateau. However, traditional coprecipitation methods cannot prepare self-standing electrodes to meet the needs of wearable energy storage devices. In this work, a water bath method is reported to grow microcube-like K2 Zn3 (Fe(CN)6 )2 ·9H2 O on carbon cloth (CC) using Zn nanosheet arrays as the zinc source and reducing agent, directly serving as a self-standing cathode. Benefiting from fast ion diffusion and high conductivity, the cathode delivers a high areal capacity of 0.76 mAh cm-2 at 0.5 mA cm-2 and excellent capacity retention of 57.9% as the current density increases to 20 mA cm-2 . By coupling with NaTi2 (PO4 )3 grown on CC as an anode, a quasi-solid-state flexible ARSIB with a high output voltage plateau of 1.6 V is successfully assembled, exhibiting a superior areal capacity of 0.56 mAh cm-2 and energy density of 0.92 mWh cm-2 . In particular, the device shows admirable mechanical flexibility, maintaining 90.3% of initial capacity after 3000 bending cycles. This work is anticipated to open a new avenue for the rational design of self-standing electrodes used in high-voltage flexible ARSIBs.
中文翻译：
自立式六氰基高铁酸钾锌阵列作为高压柔性水性可充电钠离子电池阴极的转化合成。
普鲁士蓝类似物因其独特的开放式框架和明确定义的放电电压平稳性，在水性可充电钠离子电池（ARSIB）中的应用前景广阔。但是，传统的共沉淀方法无法制备自立式电极来满足可穿戴式储能设备的需求。在这项工作中，据报道水浴法使用锌纳米片阵列作为锌源和还原剂，在碳布（CC）上生长了微立方体状的K2 Zn3（Fe（CN）6）2·9H2 O，直接用作碳源。自立阴极。得益于快速的离子扩散和高电导率，当电流密度增加至20 mA cm-2时，阴极在0.5 mA cm-2时可提供0.76 mAh cm-2的高面积容量，并具有57.9％的出色容量保持率。通过与在CC上生长的NaTi2（PO4）3作为阳极耦合，成功组装了具有1.6 V的高输出电压平稳段的准固态柔性ARSIB，其具有0.56 mAh cm-2的出色面容量和0.92 mWh cm-2的能量密度。特别是，该设备显示了令人钦佩的机械柔韧性，在3000次弯曲循环后仍可保持90.3％的初始容量。预期这项工作将为高压柔性ARSIB中使用的自立式电极的合理设计开辟新的途径。
更新日期：2019-12-27
中文翻译：
自立式六氰基高铁酸钾锌阵列作为高压柔性水性可充电钠离子电池阴极的转化合成。
普鲁士蓝类似物因其独特的开放式框架和明确定义的放电电压平稳性，在水性可充电钠离子电池（ARSIB）中的应用前景广阔。但是，传统的共沉淀方法无法制备自立式电极来满足可穿戴式储能设备的需求。在这项工作中，据报道水浴法使用锌纳米片阵列作为锌源和还原剂，在碳布（CC）上生长了微立方体状的K2 Zn3（Fe（CN）6）2·9H2 O，直接用作碳源。自立阴极。得益于快速的离子扩散和高电导率，当电流密度增加至20 mA cm-2时，阴极在0.5 mA cm-2时可提供0.76 mAh cm-2的高面积容量，并具有57.9％的出色容量保持率。通过与在CC上生长的NaTi2（PO4）3作为阳极耦合，成功组装了具有1.6 V的高输出电压平稳段的准固态柔性ARSIB，其具有0.56 mAh cm-2的出色面容量和0.92 mWh cm-2的能量密度。特别是，该设备显示了令人钦佩的机械柔韧性，在3000次弯曲循环后仍可保持90.3％的初始容量。预期这项工作将为高压柔性ARSIB中使用的自立式电极的合理设计开辟新的途径。
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