Novel Sodium–Poly(tartaric acid)Borate-Based Single-Ion Conducting Polymer Electrolyte for Sodium–Metal Batteries,ACS Applied Energy Materials

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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 ₄）₃ / 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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