Electrolyte solvation structure manipulation enables safe and stable aqueous sodium ion batteries,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Electrolyte solvation structure manipulation enables safe and stable aqueous sodium ion batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-26 , DOI: 10.1039/d0ta04800c
Huaisheng Ao _{1,

2,

3,

4,

5} , Chunyuan Chen _{5,

6,

7,

8,

9} , Zhiguo Hou _{1,

2,

3,

4,

5} , Wenlong Cai _{1,

2,

3,

4,

5} , Mengke Liu _{1,

2,

3,

4,

5} , Yueang Jin _{1,

2,

3,

4,

5} , Xin Zhang _{5,

6,

7,

8,

9} , Yongchun Zhu _{1,

2,

3,

4,

5} , Yitai Qian _{1,

2,

3,

4,

5}

Affiliation

Aqueous sodium ion batteries (ASIBs) have been limited by their poor electrochemical stability. The use of highly concentrated aqueous electrolytes is considered as an efficient strategy that increases the voltage window and improves the cycling stability. However, their cost and safety are still subjects of serious concern for practical applications. In this work, we show that a new multi-component aqueous electrolyte (MCAE) could widen the voltage window to 2.8 V with the formation of a composite solvent sheath and promote the generation of a uniform solid electrolyte interface (SEI) layer consisting of complexes with inorganic salt Na₂CO₃ and other organic components, which significantly inhibits the side reaction. Thus, this MCAE guaranteed good electrochemical stability of Na₃V₂(PO₄)₃ and NaTi₂(PO₄)₃, which suffer from severe performance degradation in aqueous electrolytes. Simultaneously, this MCAE exhibits high safety, a wide operating temperature range (−50 °C to 50 °C) and high ionic conductivity because of urea and N,N-dimethylformamide (DMF) additives. In addition, a nickel-based Prussian blue analog (NiHCF)/NaTi₂(PO₄)₃ sodium-ion full battery using such a MCAE delivers 80% capacity retention after 2000 cycles at 2C rate. Moreover, our work provides important guidelines to investigate safe, environmentally friendly and high-stability ASIBs for large-scale energy storage.

中文翻译：

电解质溶剂化结构操纵可实现安全稳定的钠离子电池水溶液

钠离子水电池（ASIB）受电化学稳定性差的限制。高浓度含水电解质的使用被认为是增加电压窗口并改善循环稳定性的有效策略。然而，它们的成本和安全性仍然是实际应用中的严重问题。在这项工作中，我们表明，新型的多组分水性电解质（MCAE）可以通过形成复合溶剂护套而将电压窗口扩大至2.8 V，并促进由络合物组成的均匀固体电解质界面（SEI）层的产生含有无机盐Na ₂ CO ₃和其他有机成分，可显着抑制副反应。因此，该MCAE保证了Na的良好电化学稳定性₃ V₂（PO₄）₃和NaTi₂（PO₄）₃，它们在水性电解质中的性能严重下降。同时，由于尿素和N， N-二甲基甲酰胺（DMF）添加剂，该MCAE具有较高的安全性，较宽的工作温度范围（-50°C至50°C）和较高的离子电导率。此外，镍基普鲁士蓝类似物（NiHCF）/ NaTi₂（PO₄）₃使用此类MCAE的钠离子充满电池在2C速率下经过2000次循环后可提供80％的容量保持率。此外，我们的工作为研究用于大规模储能的安全，环保和高稳定性ASIB提供了重要指导。

更新日期：2020-07-21

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11