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Novel Sodium–Poly(tartaric acid)Borate-Based Single-Ion Conducting Polymer Electrolyte for Sodium–Metal Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-09-11 , DOI: 10.1021/acsaem.0c01756
Li Yang 1, 2 , Yangming Jiang 1 , Xinmiao Liang 1 , Youyi Lei 1, 2 , Tianci Yuan 3 , Haiyan Lu 3 , Zhihong Liu 4 , Yuliang Cao 3 , Jiwen Feng 1
Affiliation  

The limitations of conventional organic liquid electrolytes such as sodium dendrite growth, serious side reactions, and liquid leakage hinder the development of sodium–metal batteries (SMBs). In this work, a novel sodium–poly(tartaric acid)borate (NaPTAB) salt with low cost and environmental friendliness was synthesized by an aqueous phase synthesis method. NaPTAB was combined with poly(vinylidene fluoride)–hexafluoropropylene (PVDF–HFP) to form NaPTAB-SM, and then NaPTAB-SM was swelled in the PC solution to obtain a single sodium-ion conductor gel polymer electrolyte (GPE), denoted NaPTAB-SGPE. NaPTAB-SGPE has perfect thermal stability with an initial decomposition temperature of 345 °C, a satisfactory ionic conductivity of up to 0.94 × 10–4 S·cm–1 at room temperature, a wide electrochemical window as high as 5.2 V (vs Na+/Na) at 30 °C, and a high sodium-ion transference number of 0.91 at 60 °C. Except for these satisfying performances, the Na3V2(PO4)3/Na cells assembled with NaPTAB-SGPE present excellent charge–discharge performance and stable cycling capability at high temperatures (60 °C). They also exhibit superior cycling stability compared to the liquid electrolyte cells with 1 M NaClO4 (EC/PC, 1:1, v/v, and 5% fluoroethylene carbonate (FEC)). After cycling, NaF is generated on the polymer electrolyte membrane as observed by 23Na and 19F solid-state NMR, which is more likely responsible for the excellent charge–discharge stability and cycling performance of the battery. These results show that NaPTAB-SGPE is a great potential alternative for solid-state sodium batteries.

中文翻译:

新颖的钠-聚(酒石酸)硼酸盐基单离子导电聚合物电解质,用于钠金属电池

常规有机液体电解质的局限性,例如钠树枝状晶体的生长,严重的副反应和液体泄漏,阻碍了钠金属电池(SMB)的发展。在这项工作中,通过水相合成法合成了一种低成本且对环境友好的新型钠-聚(酒石酸)硼酸钠(NaPTAB)盐。将NaPTAB与聚偏二氟乙烯-六氟丙烯(PVDF-HFP)混合以形成NaPTAB-SM,然后将NaPTAB-SM在PC溶液中溶胀以获得单一的钠离子导体凝胶聚合物电解质(GPE),表示为NaPTAB -SGPE。NaPTAB-SGPE具有出色的热稳定性,初始分解温度为345°C,令人满意的离子电导率高达0.94×10 –4 S·cm –1在室温下,宽的电化学窗口在30°C时高达5.2 V(vs Na + / Na),在60°C时钠离子转移数高达0.91。除这些令人满意的性能外,与NaPTAB-SGPE组装的Na 3 V 2(PO 43 / Na电池在高温(60°C)下具有出色的充放电性能和稳定的循环能力。与具有1 M NaClO 4(EC / PC,1:1,v / v和5%氟代碳酸亚乙酯(FEC))的液体电解质电池相比,它们还具有出色的循环稳定性。循环后,如23 Na和19所观察到的,NaF在聚合物电解质膜上产生F固态NMR,这很可能是造成电池出色的充放电稳定性和循环性能的原因。这些结果表明,NaPTAB-SGPE是固态钠电池的巨大替代品。
更新日期:2020-10-26
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