Preparation And Energy Storge Research Of Garnet-type Ceramic Fabric By EDTA Modified Cotton Template Method

With the increasing demand for wearable electronic products and smart textiles in recent years,higher requirements have been put forward for the development of lithium-ion batteries,that is,batteries need to have higher energy density and good mechanical flexibility.Therefore,the design and preparation of flexible solid electrolytes with high ionic conductivity and high safety is the key to achieve high-performance lithium-ion batteries.Based on this,this paper takes the metal adsorbent ethylenediamine tetraacetic acid（EDTA）modified cotton cloth as the main research object.Combined with textile dyeing and finishing technology and flexible lithium ion battery system,the energy storage performance of its derived ceramic fabric composite solid electrolyte is studied.A flexible composite solid electrolyte was prepared by using EDTA-modified cotton cloth as a sacrificial template to prepare Li₇La₃Zr₂O₁₂（LLZO）ceramic fabric.The ion transport mechanism and electrochemical performance were discussed;by introducing tantalum-doped metal ion precursor solution,Li_6.4La₃Zr_1.4Ta_0.6O₁₂（LLZTO）porous ceramic fabric was obtained by adsorbing LLZTO precursor solution with the same modified cotton fabric as a template,which was used as active filler in composite solid electrolyte to explore its ion conduction and interface contact properties.The main research contents of this paper are divided into the following two points.（1）Preparation of Li₇La₃Zr₂O₁₂ceramic fabric using EDTA-modified cotton fabric as a template and its energy storage research.From the perspective of developing flexible solid electrolyte,LLZO ceramic fabric were prepared by using metal adsorbent（EDTA）modified cotton fabric as template to obtain flexible composite solid electrolyte.When the content of ceramic particles is 25%,the ionic conductivity of LLZO ceramic fabric composite solid electrolyte（LLZO CF-CSE）is 3.5×10^-4S cm^-1at 50°C.At the same time,the all-solid-state lithium battery based on Li Fe PO₄cathode can still show a discharge specific capacity of 116.8 m Ah g^-1after 308 cycles at a high current density of 1 C;In addition,the flexible battery based on LLZO CF-CSE can provide an effective and stable power supply for LED lights after repeated folding.（2）Preparation of tantalum doped Li_6.4La₃Zr_1.4Ta_0.6O₁₂ceramic fabric by using modified cotton fabric as a template and its energy storage research.In order to further improve the ionic conductivity to meet the needs of high-energy solid-state lithium metal batteries,tantalum（Ta）element doping was introduced to prepare LLZTO ceramic fabric,and polymer PEO-Li TFSI solution was poured on both sides to form LLZTO ceramic fabric composite solid electrolyte（LLZTO CF-CSE）.The content of LLZTO ceramic fabric increased to 35.73%,and the ionic conductivity of CSE was 1.75×10^-4S cm^-1at room temperature.When the temperature increased to 50℃,the ionic conductivity was as high as 8.56×10^-4S cm^-1.The LLZTO CF-CSE film also has excellent mechanical properties,with a maximum strain of 1059%.Electrochemical tests show that the assembled lithium symmetric battery can cycle stably for more than 380 h at a current density of 100μA cm^-2,and the polarization voltage is only 200 m V;the energy storage test shows that the coulombic efficiency of the all-solid-state lithium battery is 99.89%after 97 cycles at 0.2 C.