High-capacity V2O5.nH2O thin-film electrode material for lithium ion battery

Abstract

The invention relates to a high-capacity V2O5.nH2O thin-film electrode material for a lithium ion battery. The high-capacity V2O5.nH2O thin-film electrode material is prepared by the following methods: (1) preparation of V2O5 sol, namely taking a proper amount of 30% hydrogen peroxide (H2O2) solution into a small beaker, weighing a certain amount of vanadium pentoxide (V2O5) powder into the beaker, slowly stirring the V2O5 powder at a room temperature until the V2O5 powder is completely dissolved, adding a proper amount of deionized water, further stirring the solution until stable reddish brown sol is formed, and diluting to a precise volume to obtain the V2O5 sol with the concentration being 0.008 mol / dm<3>; (2) pretreatment of an indium tin oxide (ITO) base, namely ultrasonically washing a to-be-treated ITO conductive glass sheet with a little of ethanol and deionized water sequentially for 15-30 minutes, and naturally drying the ITO conductive glass sheet for later use; and (3) preparation of a V2O5.nH2O thin-film electrode, namely taking 25[mu]l of V2O5 sol with a pipettor, spreading the V2O5 sol on the conductive surface of the pretreated ITO conductive glass sheet, naturally drying the V2O5 sol at the room temperature, sintering the ITO conductive glass sheet in a vacuum chamber at 150 DEG C for two hours, and naturally cooling the ITO conductive glass sheet to the room temperature, so as to obtain the V2O5.nH2O thin-film electrode. The prepared V2O5.nH2O thin-film has a special porous mesh morphology; the specific capacity of the lithium ion battery can be improved; the cycle performance of the lithium ion battery can be improved; the preparation process flow is simple; the production cost is low; and the high-capacity V2O5.nH2O thin-film electrode material has great application value.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a high-capacity V 2 o 5 ·nH 2 O thin film electrode material. Background technique [0002] Lithium-ion battery is a new type of storage battery developed on the basis of lithium battery in the last century. Lithium-ion battery has become the preferred choice of portable electronic products due to its advantages of high specific energy, high power density, long cycle life, small self-discharge, and high cost performance. Main candidates for rechargeable power supplies. As a power replacement product, it may be used in the field of high-power electrical appliances in the future. Whether lithium-ion batteries can be commercialized will mainly depend on performance and price. In the development process of lithium-ion batteries, cathode materials may become a bottleneck restricting their large-scale promotion and application. Therefore, the development of cathode materials with...

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Problems solved by technology

However, in practical applications, there are still problems such as low ion transmission rate, low conductivity, poor charge-discharge cycle performance, low specific capacity and energy density, which limit its application in the field of lithium-ion batteries.

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