Used For The Preparation Of Flexible Fibrous Dual-ion Battery Electrode Materials And The Study Of Its Electrochemical Performance

At present,lithium ion battery is widely used in all aspects of people's production and life.Lithium ion battery has high specific energy density,low self-discharge rate,wide operating temperature range,no memory effect,compared with traditional lithium battery can adapt to a wider range of applications.However,the low energy density of lithium ion batteries will hinder their further application.With the further study of the researchers,it is found that the dual-ion battery has the advantages of wider working potential window,higher energy density,lower cost,and more environmentally friendly electrode materials.Based on the above advantages,the research of dual-ion battery has become one of the hot spots.Based on the above advantages,the research of dual-ion batteries has become a hot spot.With the continuous upgrading of electronic products,the demand for batteries is also growing.In order to meet the growing consumer demand for batteries,more and more researchers are engaged in the research of flexible wearable batteries.Conventional batteries are rigid and cannot be bent due to the limitation of electrode materials and manufacturing technology.To prepare flexible batteries,electrode materials that are flexible,flexible and have good electrochemical properties are needed.In the research,according to the working principle of dual-ion battery has designed two kinds of flexible fibrous dual-ion battery,is a kind of porous aluminium wire at the same time as the cathode active electrode material and fluid collection,expanded graphite as the anode active electrode material of flexible fiber shaped lithium dual-ion battery,porous structure can buffer volume expansion and increase the rate of ion diffusion electrode and electrode reaction active site.Expanded graphite can increase the number of electrode reactive sites and inserted ions.Based on the active material of positive electrode material,the battery shows a high mass specific energy density of 598 Wh kg-1(23.4 mWh cm-3).The other is ReS2@CNT-fiber,which is used as the active electrode material for the negative electrode,and expanded graphite,which is used as the active electrode material for the positive electrode,is a flexible fiber-type potassium dual-ion battery.ReS2 has a wide layer spacing and can be easily inserted into ions.The battery shows a high specific energy density of 412.9 Wh kg-1.In the electrode reaction process of traditional lithium ion battery,lithium cation circulates between the positive electrode and the negative electrode,which causes the electrons to circulate between the positive electrode and the negative electrode to charge and discharge.In contrast,anions also participate in the electrode reaction in the process of electrode reaction.A series of in-situ and ex-situ physical characterization experiments were carried out to study the reaction mechanism.Through the analysis of the experimental results,the chemical equation of the electrode reaction process of the negative electrode,the positive electrode and the whole electrode is obtained.