Preparation method of high-initial-efficiency lithium silicon oxide negative electrode material
A negative electrode material, lithium silicon oxide technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of low initial efficiency, Li loss of activity, etc., to achieve low activity, simple preparation process, and controllable material properties Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0030] A method for preparing a high primary efficiency silicon oxide lithium negative electrode material according to the present invention, the preparation method specifically includes the following steps:
[0031] The first step, because the melting point of metal lithium is low, the temperature of existing spray drying equipment is close to the melting point of metal lithium, so the metal lithium can be liquefied, and the spray process can be used to obtain metal lithium particles with large specific surface area and uniform size; Micron silicon powder and nano silicon dioxide are mixed and pressed by a press to form a block mixture; this is mainly to form a uniformly mixed gas in the later gasification process, and the reaction is more complete. Metal lithium uses pure metal lithium ingots, because there is an oxide layer on the surface, the activity of metal lithium is low, and it can be stored stably in a low-humidity environment. The mixing molar ratio of the micron si...
specific Embodiment
[0043] First, mix the micro silicon and nano silicon dioxide according to the molar ratio of 1:1, and then press the block through a press, heat the reaction furnace to 1350 ° C at a rate of 10 ° C / min, vacuum degree ≤ 50 Pa, and react for 10 h; Then collect the block mixture on the substrate of the condensation end, and the color of the mixture is brown; the block is crushed by jaw crusher and ball mill, and the powder with D50 of 5~10um is obtained by classification; further, the obtained silica The precursor is coated by CVD, the gas source is one or several mixtures of alkanes, alkenes or alkynes with low carbon content, the reaction temperature is 900°C, the carbon coating time is 5h, and a dense layer is coated on the surface of the material. carbon layer with a carbon content of 1-20%; further, the silicon-oxygen raw material prepared in the previous step is placed in the reaction chamber to liquefy metal lithium at a reaction temperature of 240°C, and the metal lithiu...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More