High-volume V2O5 film anode material for lithium ion battery

Abstract

The invention discloses a high-volume V2O5 film anode material for a lithium ion battery. A preparation method of the high-volume V2O5 film anode material for a lithium ion battery comprises the following steps of 1, preparing V2O5 sol by mixing V2O5 powder and H2O2 with stirring, 2, preparing sol having different concentrations by preparing the V2O5 sol into the sol respectively having concentrations of 0.002-0.016mol / L, 3, pre-treating a Pt substrate by immersing the Pt substrate in hydrogen peroxide for 10 min, flushing by deionized water and naturally drying in air, and 4, preparing a V2O5 film electrode by taking 10 microliters of the V2O5 sol having the required concentration, laying the V2O5 sol on the Pt substrate, naturally drying in air, putting the Pt substrate with the dried V2O5 sol into a muffle furnace having a temperature of 500 DEG C, carrying out calcination for 2 hours, and naturally cooling to a room temperature to obtain a V2O5 film electrode. The high-volume V2O5 film anode material for a lithium ion battery has a special microstructure and can improve a specific capacity of a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a high-capacity V 2 o 5 Thin film cathode materials. Background technique [0002] Lithium-ion battery is a new battery developed on the basis of lithium battery in the last century. It has the advantages of high voltage, large specific energy, and long cycle life. It has been widely used in various daily small portable power supplies. It may be applied in the field of high-power electrical appliances in the future. In recent years, with the emergence of high-performance anode systems, the research on electrolytes has also made great progress. Relatively speaking, the research on cathode materials for lithium-ion batteries lags behind, which limits the further improvement of the overall performance of lithium-ion batteries. At present, the cathode materials that have been studied more mainly include LiMO with a layered structure. 2 (Where: M=Ni, Co, Mn, etc.), it also incl...

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Problems solved by technology

Spinel-type LiMn2O4 has the advantages of good safety performance and easy synthesis. John-Teller effect, the structure is distorted, which reduces the symmetry of the spinel structure, resulting in poor cycle performance

LiMPO4 with olivine crystal structure (where: M= Fe, Mn, Ni, Co, etc.) has the advantages of good thermal stability and high safety performance, and its stability in the charged state exceeds that of layered The transition metal oxide of the structure makes it especially suitable for power battery materials, but there is an irreversible capacity problem caused by low conductivity. On the one hand, the improvement method is: by changing the synthesis method to prepare fine particles and high purity Powder material; on the other hand, by doping metal powder or metal ions to improve its conductivity and increase reversible capacity

[0003] V2O5 in triclinic system, VO4 tetragonal The cone units are combined into chains through oxygen bridges, and the chains are connected through another oxygen bridge to form a complex chain, thus forming a layered arrangement parallel to the [001] plane, which is very suitable for the deintercalation of lithium ions, but in 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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