Quick-charging negative electrode material production process and device

Abstract

The invention discloses a quick-charging negative electrode material production process and device. The device comprises a bucket elevator, a stock bin, a melting tank, a pressurizing tower, a distillation tower, a crusher, a screening machine and a high-temperature carbonization furnace, wherein the bucket elevator is connected with the stock bin, the stock bin feeds materials to the melting tankthrough the screw feeder, the melting tank is connected with the pressurizing tower, a light phase extraction opening of the pressurizing tower is connected with the distillation tower, a coke outletof the pressurizing tower feeds materials to the crusher, the crusher feeds materials to the screening machine, and the screening machine feeds materials to the high-temperature carbonization furnace. According to the invention, different asphalt raw materials are coarsely crushed or directly melted, then enter the pressurizing tower for coking and are crushed and screened after coke discharging,and then the treated raw materials enter the high-temperature carbonization furnace for carbonization to obtain the negative electrode material with excellent electrochemical performance and stable material structure. The high-capacity quick-charging negative electrode material prepared by the invention is high in battery safety performance, high in capacity, good in rate capability, excellent incycle performance and outstanding in anti-attenuation capability, and is an excellent raw material for lithium ion and sodium ion batteries and quick-charging battery equipment.

Description

technical field [0001] The invention belongs to the field of negative electrode materials, and in particular relates to a production process and device of a fast-charging negative electrode material. Background technique [0002] With the application of information technology equipment in daily life, humans have put forward higher requirements for the performance of lithium-ion batteries, and the development of fast-charging anode materials has become one of the important research directions for the development of lithium batteries. At the same time, lithium-ion batteries occupy a dominant position in rechargeable batteries. However, due to the disadvantages of limited lithium resources and high cost of lithium-ion batteries, the research on sodium-ion batteries with abundant resource reserves and lower costs is also an important research in energy storage technology. direction. [0003] Based on the stable structure of fast-charging anode materials, it has excellent rate c...

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Problems solved by technology

[0004] Patent document CN106099109A uses medium-temperature asphalt as raw material, terephthalmic acid as crosslinking agent, p-benzenesulfonic acid as catalyst to crosslink and modify asphalt, and then adds sodium chloride template to carbonize to obtain pitch-based hard carbon nanosheets. The reversible capacity of the hard carbon negative electrode material prepared by the process is only 270mAh / g, the process steps are cumbersome, and a variety of organic additives are added when the asphalt is modified, which will bring corresponding problems to the environment and operating costs, and industrialization is difficult

Patent document CN103011127A crushes, solidifies, and carbonizes asphalt with a softening point below 280°C to produce hard carbon. The specific surface area of ​​the obtained negative electrode material is too high, which increases the irreversible capacity of the first charge and discharge, and reduces the charge and discharge efficiency of the electrode material.

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