锂离子电池陶瓷复合全固态电解质的制备和性能研究

Preparation and Property of a Novel Heat-resistant Ceramic Composite Solid-state Electrolyte for Lithium Batteries

以负载Al_2O_3的无纺布为支撑膜,浸涂PEO-LAGP-SN-Li TFSI的乙腈共混液干燥后制得新型复合固态电解质膜(CLASP)。该膜的热稳定性好,即使在170℃的高温下依然不发生形变。当浸涂共混液中PEO:LAGP:SN:Li TFSI为3:1:1:1,固含量为10wt%时,室温电导率可以达到3.66×10^(-5) S/cm,100℃时电导率可达2.52×10^(-4) S/cm.CLASP膜的电化学窗口宽,以该膜代替液态电解质装配的全固态LiFePO_4/CLASP/Li电池,在55℃循环时表现出良好的循环稳定性,高的库伦效率,有望成为电化学性能优越的全固态电解质。

Poly（ethylene oxide） （PEO） as a kind of promising candidates of polymer electrolyte is widely applied in all solid lithium ion batteries. In this study, a novel ceramic composite solid electrolyte （CLASP） was prepared by dip-coating PEO-LAGP-SN-LiTFSI （PEO-SPE） into A1203 nonwoven membrane. And all solid batteries were assembled with CLASP. CLASP showed excellent thermostability even at 170℃ for 2 h. When the ratio of PEO： LAGP： SN： LiT- FSI was 3： 1： 1： 1, the conductivities of CLASP reached 3.66x105 S/cm at 25℃ and 2.52x10-4 S/cmat 100℃, re- spectively. The electrochemical window of CLASP was 5.5 V, which had great potential to apply in battery with high voltage cathode material. The cycling performance of all solid batteries with CLASP was greatly improved at 55℃ as well. This new ceramic composite, solid polymer electrolyte, with all these outstanding performance is a promising candidate of all solid electrolytes.