It is still a great challenge to fabricate dense solid electrolyte with high ionic conductivity using a facile and low-cost method for all solid-state rechargeable battery. In this context, a cold sintering process (CSP) is employed to prepare the ceramic solid electrolytes at an extremely low temperature of 120 °C, significantly suppressing the Li loss and impurity formation by traditionally high-temperature sintering. The low temperature prepared Li_1.5Al_0.5Ge_1.5(PO₄)₃ (LAGP)-LiClO₄ (10.0 wt%) composite electrolyte exhibits a high ionic conductivity of 6.35 × 10⁻⁵ S/cm, low activation energy of 0.26 eV and high relative densities of 90%. The Li | CSP LAGP-LiClO₄ (10.0 wt%) | Li symmetric cell delivers a cycling time retention of over 350 h with a stabilized voltage overpotential at a current density of 0.2 mA/cm². Moreover, the high Coulombic efficiency of 99.97% and capacity retention of 150 mAh/g are achieved after 130 cycles at 0.1 C in Li | CSP LAGP-LiClO₄ (10.0 wt%) | LiFePO₄ solid cells. These good electrochemical performances are originated from the well-constructed solid electrolyte-electrode interfaces, where the electrochemically active interface demonstrates the powerful self-stabilization function to maintain the tight interface connection as well as the continuous Li ion transport. The CSP method sheds new light on the fabrication of solid electrolytes at a low temperature and inexpensive way, hence provides a rewarding avenue to fabricate better solid-state batteries and other electrochemical devices.

对于全固态可充电电池，使用简便、低成本的方法制造具有高离子电导率的致密固体电解质仍然是一个巨大的挑战。在此背景下，采用冷烧结工艺 (CSP) 在 120 °C 的极低温度下制备陶瓷固体电解质，显着抑制了传统高温烧结造成的锂损失和杂质形成。低温制备的 Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) ₃ (LAGP)-LiClO ₄ (10.0 wt%) 复合电解质具有 6.35 × 10 ^-5的高离子电导率S/cm，0.26 eV 的低活化能和 90% 的高相对密度。李| CSP LAGP-LiClO ₄ (10.0 wt%) | 锂对称电池在 0.2 mA/cm ²的电流密度下提供超过 350 小时的循环时间保持和稳定的电压过电位。此外，在 0.1 C 的 Li | 中，在 130 次循环后实现了 99.97% 的高库仑效率和 150 mAh/g 的容量保持率。CSP LAGP-LiClO ₄ (10.0 wt%) | 磷酸铁锂₄固体细胞。这些良好的电化学性能源于结构良好的固体电解质-电极界面，其中电化学活性界面表现出强大的自稳定功能，以保持紧密的界面连接以及连续的锂离子传输。CSP 方法为以低温和廉价的方式制造固体电解质提供了新的思路，因此为制造更好的固态电池和其他电化学装置提供了有益的途径。