Niobium-doped tin dioxide thin film lithium ion battery negative pole plate, preparation method thereof and lithium ion battery

Abstract

The invention relates to a niobium-doped tin dioxide thin film lithium ion battery negative pole plate, a preparation method thereof and a lithium ion battery, and belongs to the technical field of a lithium ion battery negative electrode material. The niobium-doped tin dioxide thin film lithium ion battery negative pole plate comprises a current collector and a niobium-doped tin dioxide thin film arranged on the current collector. In the niobium-doped tin dioxide thin film lithium ion battery negative pole plate, the volume expansion is more uniform, the niobium-doped tin dioxide thin film lithium ion battery negative pole plate has relatively high lithium ion diffusion rate and electrical conductivity, the phenomena that the volume of an electrode material is expanded and a structure is pulverized, broken and separated from the current collector under high-rate charging and discharging can be effectively reduced, the discharging capacity is improved, and the cycle lifetime is prolonged. Moreover, the niobium-doped tin dioxide thin film lithium ion battery negative pole plate is high in discharging capacity, small in initial irreversible capacity and long in cycle lifetime, is safe and environment-friendly, and has a wide application prospect in the field of the lithium ion battery.

Description

technical field [0001] The invention relates to a niobium-doped tin dioxide thin-film lithium-ion battery negative pole piece, a preparation method thereof, and a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, due to the burning of fossil fuels and bio-energy, the drastic changes in the environment and the excessive use of energy have reached the point of concern. To this end, people began to look for new energy sources with abundant reserves to replace these non-renewable energy sources, such as solar energy, wind energy, tidal energy, geothermal energy and so on. These new energy sources all require energy storage devices, and the most convenient energy storage devices are batteries. Due to its large battery capacity, long cycle period, high output voltage and strong environmental protection compared with traditional lead-acid batteries, lithium-ion batteries are expected to lead a reform of electr...

AI Technical Summary

Problems solved by technology

However, the tin dioxide material is an n-type semiconductor oxide, and its poor electronic conductivity will hinder the reaction of lithium ions with the material, coupled with its own physical properties and lithium intercalation and desorption mechanism, resulting in a large-rate charge-discharge cycle. The expansion is relatively large, and the structure is prone to pulverization and rupture and separation from the current collector, so the cycle stability is relatively poor, and it may even cause a safety accident due to a short circuit

[0004] There are many preparation methods for tin dioxide materials, such as precipitation method, hydrothermal method, and sol-gel method. These preparation methods can obtain nano-sized tin dioxide crystal particles by adjusting experimental parameters, but the preparation process is often complicated. ; Although the processing cost of tin dioxide film materials prepared by methods such as chemical vapor deposition and electrodeposition is relatively low and convenient, they are subject to certain restrictions in actual preparation, and the discharge capacity is not high when used as lithium-ion battery negative electrode materials , large irreversible capacity in the first week, poor cycle stability

This method involves a complex process, takes a long time, and has many influencing factors that are not easy to control

The prepared lithium-ion battery negative electrode material has high irreversible capacity for the first time, poor cycle stability, and performance cannot meet production needs

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