A preparation method of lithium ion using inorganic perovskite derivative phase as negative electrode material

Abstract

The invention discloses a preparation method of an inorganic perovskite derivative phase used as a negative electrode material for lithium ions, which relates to the technical fields of preparation and research of the negative electrode material of lithium ion batteries and the like. The precursor of lead bromide and cesium bromide was evaporated by vacuum thermal deposition process and depositedon the copper foil of cathode current collector. The cathode material was homogeneous and dense by subsequent heating and baking. The invention utilizes the principle of chemical solid state reactionand thermal evaporation vapor deposition, Using inorganic lead bromide and cesium bromide as raw materials, the pure inorganic perovskite materials were prepared by vacuum heating and evaporation on current collector copper foil substrate. The evaporation rate of precursor material was adjusted and the thickness and thickness ratio of the precursor material were adjusted during the reaction. Applying it to the cathode material of lithium ion battery, it exhibits good thermodynamic stability and excellent physicochemical properties, and the process is simple.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery negative electrode materials, in particular to a method for an inorganic perovskite-derived phase negative electrode material. Background technique [0002] With the rapid development of modern technology and economy, people's dependence on fossil fuels is becoming more and more serious. With the gradual depletion of fossil energy and the environmental pollution caused by their burning, the energy shortage and environmental degradation are becoming more and more serious. It has become the core issue that threatens the survival and development of human beings, and the development of new energy has become a major issue that people need to solve urgently. In recent years, with the vigorous development of renewable clean energy such as solar energy, wind energy, and nuclear energy, rechargeable batteries capable of energy conversion and storage have shown broad application p...

AI Technical Summary

Problems solved by technology

However, the theoretical specific capacity of graphite-based materials is low, and the discharge performance is poor under high-rate conditions.

In addition, the lithium-deintercalation potential of the graphite negative electrode is similar to the lithium potential, and it is easy to precipitate lithium to form lithium dendrites, which can cause short circuits and other shortcomings.

These aspects will restrict its application in low cost and high energy density

The lithium titanate negative electrode material has the advantages of long life, high safety, fast charging, and good cycle performance; but there are also disadvantages such as low electronic conductivity, gas production that causes battery expansion, and high cost.

Although the silicon material has a high theoretical specific capacity, it has serious volume expansion and contraction during the lithium intercalation and extraction cycle, resulting in the destruction of the material structure and mechanical crushing, resulting in poor cycle performance of the electrode, which will It poses higher challenges and requirements for its practical application

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