3D打印超拉伸凝胶电解质及其在柔性铝空气电池中的应用

3D printing of hyperstretching gel electrolyte and its application in flexible aluminum-air battery

摘要:

采用细菌纤维素（BC）、聚乙烯醇（PVA）为原料，通过3D打印与冻融循环法制备超拉伸凝胶电解质。采用SEM、接触角测量、XRD、EIS和拉伸测试对凝胶电解质物理特性、电化学性能及拉伸性能进行表征。实验结果表明，当m(BC)∶m(PVA)=0.6∶1时，基于3D打印制备的凝胶电解质具有稳定的三维网络结构、优异的拉伸性能和电化学性能，拉伸强度可达0.9 MPa、断裂伸长率可达961%、离子电导率为1.10×10-1 S/cm。将该凝胶电解质应用于柔性铝空气电池，功率密度可达21 mW/cm2，电流密度为20 mA/cm2时，铝阳极比容量为1124 mA?h/g，电池可稳定放电90 min。

Abstract:

Using bacterial cellulose (BC), polyvinyl alcohol (PVA) as raw materials, the superstretched gel electrolyte was prepared by 3D printing and freeze-thaw cycle method. The physical, electrochemical and tensile properties of gel electrolytes were characterized by SEM, contact angle measurement, XRD, EIS and tensile test. The experimental results show that when m(BC)∶m(PVA)=0.6∶1, the gel electrolyte prepared based on 3D printing has a stable three-dimensional network structure, excellent tensile properties and electrochemical performance, the tensile strength can reach 0.9 MPa, and the elongation at break can reach 961%, the ionic conductivity is 1.10×10-1 S/cm. The gel electrolyte is applied to flexible aluminum-air battery, the power density can reach 21 mW/cm2. When the current density of aluminum-air battery is 20 mA/cm2, the specific capacity of aluminum anode is 1124 mA?h/g, and the battery can discharge stably for 90 minutes.