High-temperature device for preparing lithium ion battery negative electrode material and preparation method of material

Abstract

The invention relates to a high-temperature device for preparing a lithium ion battery negative electrode material and a preparation method of the material. The high-temperature device comprises a binbody, and a vacuum device, a transmission device, a gas mixing device and a tail gas treatment device which are connected with the bin body, wherein the bin body comprises a vacuum reaction chamber and a rotary collection chamber, the front end of the rotary collection chamber communicates with the vacuum reaction chamber, the rear end of the rotary collection chamber is respectively connected with the vacuum device, the transmission device and the gas mixing device, and the tail gas treatment device is connected with the vacuum reaction chamber; and the vacuum reaction chamber and the rotarycollection chamber are each provided with an independent heating device, and the temperature of the vacuum reaction chamber and the temperature of the rotary collection chamber can be independently controlled. The preparation method comprises the following steps: respectively placing a silicon monoxide raw material and an inner core material in the vacuum reaction chamber and the rotary collection chamber, respectively controlling the reaction temperatures of the vacuum reaction chamber and the rotary collection chamber, depositing gas-phase silicon monoxide on the surface of the inner core material to form a nano-scale coating layer, and carrying out carbon coating to obtain the lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery negative electrode materials, and in particular relates to a high-temperature device for preparing lithium-ion battery negative electrode materials and a preparation method thereof. Background technique [0002] With the rapid development of modern consumption, electronics, and electric vehicle industries, the research and industrialization of lithium-ion batteries as energy sources are becoming more and more important. As an important indicator to measure battery performance, the energy density of lithium-ion batteries still needs to be further improved. However, the energy density improvement of traditional carbon-based anode materials has reached the limit, which cannot meet the needs of high energy density lithium-ion batteries. In order to promote the further development of lithium-ion batteries and related industries and meet the market demand for lithium-ion batt...

AI Technical Summary

Problems solved by technology

[0005] In the existing silicon oxide negative electrode preparation technology, not only high energy consumption, low yield, but also poor batch stability and uneven material quality levels severely limit the large-scale preparation of silicon oxide negative electrode materials

In addition, when C-SiOx formed after pulverization and coating is mechanically mixed with other negative electrode materials, there are still problems such as excessive particle size and pulverization during the cycle, which leads to rapid deterioration of battery performance and seriously affects the performance of silicon oxide. Negative electrode industrial application

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