A three-dimensional limn 2 o 4 Preparation method of thin-film positive electrode and three-dimensional all-solid-state thin-film lithium-ion battery

Abstract

The invention discloses a three-dimensional LiMn 2 o 4 The preparation method of thin-film positive electrode and three-dimensional all-solid-state thin-film lithium-ion battery, including LiMn with Li excess 2 o 4 The material is used as the target, the chamber is evacuated, the substrate is heated, argon and oxygen are introduced, and the chamber gas pressure is adjusted; three-dimensional LiMn is obtained on the substrate. 2 o 4 thin films; for the obtained three-dimensional LiMn 2 o 4 Thin film annealing. A solid electrolyte film, a negative electrode film, and a negative electrode current collector are sequentially plated on the three-dimensional positive electrode film. The beneficial effects are: the preparation of the thin-film positive electrode does not need to use a template, and the three-dimensional structure is directly obtained by direct current magnetron sputtering, the method is simple, the cost is low, and it is easy to industrialize; the new electrode improves the LiMn 2 o 4 The specific surface area of ​​the material reduces the contact resistance and achieves high rate performance. The three-dimensional all-solid-state thin-film battery made of three-dimensional thin-film electrodes has excellent rate and cycle stability, and increases energy density and power density per unit area.

Description

technical field [0001] The invention relates to the technical field of an all-solid-state thin-film lithium-ion battery, in particular to a three-dimensional LiMn 2 o 4 A method for preparing a thin-film positive electrode and its application to a three-dimensional all-solid-state thin-film lithium-ion battery. Background technique [0002] In recent years, lithium-ion batteries have become the first choice for new green energy and portable electronic equipment batteries due to their advantages such as high capacity, high working voltage and no memory effect, and have achieved tremendous development in the field of power energy. However, the current commercial lithium-ion batteries have certain safety hazards due to the use of organic electrolytes that are flammable, explosive and volatile. Using solid electrolyte to replace organic liquid electrolyte and preparing all-solid-state thin-film lithium-ion batteries is the fundamental way to solve the current safety problems o...

AI Technical Summary

Problems solved by technology

Cathode material is the key factor affecting battery performance. The current preparation of cathode materials often requires high temperature treatment in order to obtain ideal crystal structure and crystallinity, but the three-dimensional nanostructure is difficult to maintain under high temperature conditions, and there may be high temperature between the substrate and the cathode material. Introduce impurities to affect its electrochemical performance (Functional Materials letters, 2014, 7, 1430003.)

In addition, it is also a new idea to prepare three-dimensional cathode materials by preparing a three-dimensional template on the substrate first and then depositing cathode materials on it. However, the process is complicated, and the deposition of cathode materials on the template surface is difficult. There are difficulties (Advanced Materials, 2010, 22, 4978-4981; Nano Letters, 2013, 13, 293-300.)

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