Continuous silicon carbon negative dynamic CVD sintering furnace

Abstract

The invention discloses a continuous silicon carbon negative dynamic CVD sintering furnace, which comprises an installation platform, a spiral feeder, a furnace head cover, a furnace pipe and a furnace tail cover, wherein the head end of the furnace pipe is positioned in the furnace head cover and the tail end of the furnace pipe is positioned in the furnace tail cover, the spiral feeder is joinedwith the furnace head cover, and a discharging port is formed in the furnace tail cover; the part, outside the furnace head cover, of the head end of the furnace pipe is provided with a first sealingflange, a first corrugated pipe is arranged between the first sealing flange and the furnace head cover, the first sealing flange is in sealing connection with the first corrugated pipe, and a firstexhaust hood is sleeved on the outer periphery of the connection between the first sealing flange and the first corrugated pipe; the part, outside the furnace tail cover, of the tail end of the furnace pipe is provided with a second sealing flange, a second corrugated pipe is arranged between the second sealing flange and the furnace tail cover, the second sealing flange is in sealing connection with the second corrugated pipe, and a second exhaust hood is sleeved on the outer periphery of the second sealing flange and the second corrugated pipe. The sintering furnace adopts the exhaust hood to timely exhaust the gas capable of leaking so as to prevent the danger of explosion caused by the leakage of dangerous gas, and the sintering furnace has good overall sealing property, is safe and reliable.

Description

technical field [0001] The invention relates to sintering equipment for battery negative electrode materials, in particular to a continuous silicon carbon negative electrode dynamic CVD sintering furnace. Background technique [0002] Anode materials are an important part of lithium-ion batteries, which directly affect the energy density, cycle life and safety performance of batteries. Silicon carbon negative electrode (silicon carbon negative electrode: a new type of negative electrode material for lithium batteries, which is composed of silicon and carbon, has a variety of reaction technologies, CVD is one of them) as an emerging negative electrode material, its capacity reaches the mainstream graphite Dozens of times that of negative electrode materials is the future direction of negative electrode material development. CVD (CVD: Chemical Vapor Deposit, a reaction technology) method is the mainstream preparation method of silicon carbon negative electrode carbon coating,...

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Problems solved by technology

[0003] In order to solve the above problems, some companies have used small intermittent rotary tubes for small batch preparation, but their output is small and cannot be continuously fed in and out, so they can only be used for experiments and cannot be mass-produced.

The main disadvantages of using this kind of laboratory to produce small batches of intermittent rotary tubes are: the output of intermittent rotary tubes is small, which is limited to experimental research and cannot achieve mass production; the production method is intermittent production, and continuous production with continuous feeding cannot be realized.

[0004] On the other hand, the existing continuous rotary furnaces produced in large quantities cannot meet the production conditions of silicon carbon negative electrodes, mainly reflected in:

[0005] (1) The carbon coating process of the silicon carbon negative electrode needs to be fed with acetylene as the reaction gas, and the reaction process is very easy to oxidize, and the sealing effect is extremely high, especially the seal of the inlet and outlet, the dynamic seal of the furnace tube and the shaft dynamic seal of the feeder , the sealing effect of the existing rotary kiln cannot meet the sealing requirements of silicon carbon negative electrode production;

[0006] (2) Due to the existence of dangerous gases such as acetylene, methane and hydrogen, the existing rotary kiln cannot realize the explosion-proof function;

[0007] (3) The sintering quality of silicon-carbon negative electrode is directly related to the thickness of carbon coating. The carbon coating process needs to accurately control the ratio of silicon source (silicon powder) and carbon source (acetylene gas). Precise ratio control of gas flow and air intake

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