【摘要】 在固态锂电池正极/氧化物电解质界面处引入聚氧化乙烯（PEO）缓冲层以改善固体接触。首先,用热压烧结法制备了密度为5.25 g·cm^-3、锂离子电导率为8.33×10^-4S·cm^-4的Li_6.4La₃Zr_1.4Ta_0.6O₁₂（LLZTO）固体电解质。其次,配制了PEO-LiTFSI-LLZTO缓冲层和LiFePO₄复合正极浆料,用匀胶机旋涂法将PEO缓冲层和复合正极浆料依次涂覆在电解质表面,加热加压后显著改善界面接触,测得60℃下正极界面电阻值为509Ω·cm²。测试对称电池充/放电曲线证明界面稳定性良好,电池首次循环放电容量145.8 mAh·g^-1,库伦效率大于97%。更多还原

【Abstract】 PEO buffer layer was introduced to the cathode/electrolyte interface to improve contact.First,Li₆.4 La₃ Zr_1.4Ta_0.6O₁₂（LLZTO）with a density of 5.25 g·cm^-3 and an ionic conductivity of 8.33×10^-4 S·cm^-1 was prepared.Then PEO-LiTFSI-LLZTO buffer layer and LiFePO₄ composite cathode slurry were prepared.The PEO buffer layer and cathode slurry were coated on the surface of electrolyte by a spin coating method.The results show that the interfacial contact is improved under applied pressure at 60℃,and the resulting interfacial resistance is 509 Ω·cm².The galvanostatic charge and discharge curve of symmetric battery proves excellent interfacial stability.The solid-state battery has the fist discharge capacity of 145.8 mAh·g^-1 and the coulombic efficiency exceeds 97%.更多还原