Lithium ion battery negative electrode material and low-cost preparation method thereof

Abstract

The invention discloses a lithium ion battery negative electrode material and a low-cost preparation method thereof. The low-cost preparation method of the lithium ion battery negative electrode material comprises the following steps: heating the silicon monoxide powder in a rotary calcining furnace to 900-1200 DEG C in a high-purity nitrogen atmosphere, carrying out heat preservation for 0.5-1 hour, introducing a mixed gas of high-purity nitrogen and natural gas to carry out carbon coating on the overturned silicon monoxide powder, and finally, carrying out crushing and grading treatment to obtain the lithium ion battery negative electrode material. The preparation method is simple, suitable for continuous and large-scale production and low in production cost, and the button cell preparedfrom the lithium ion battery negative electrode material is high in first capacity, high in first efficiency and high in 50-week capacity retention ratio.

Description

Technical field [0001] The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a lithium ion battery negative electrode material and a low-cost preparation method thereof. Background technique [0002] At present, environmental pollution in countries around the world is becoming more and more serious. As an effective measure to solve environmental pollution problems, new energy vehicles have been widely concerned and developed vigorously. As the energy supply component of new energy vehicles, the problem that needs to be solved urgently is improvement. Energy density, increase endurance energy, and reduce production costs. In addition, with economic development, the demand for low-cost and high-capacity lithium-ion batteries is increasing. [0003] The silicon oxide anode material has received extensive attention and research due to its ultra-high specific capacity and excellent cycle performance. It is currently the most ...

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Problems solved by technology

[0003] Silicon oxide anode material has received extensive attention and research because of its ultra-high specific capacity and excellent cycle performance. It is currently the most likely anode material to be applied to electric vehicles and 5G mobile devices. High production cost limits the development of its market application, as the Chinese patent with publication number CN1302075C discloses a conductive silicon compound, its preparation and the negative electrode material of a non-aqueous electrolyte secondary battery, which adopts methane, ethane, Ethylene, acetylene and other gases are vapor-phase-deposited with carbon coating to prepare silicon oxide negative electrode materials. The cost of all gases is relatively high, which makes the overall manufacturing cost of negative electrode materials relatively high, which is not suitable for large-scale popularization and application; Chinese patent with publication number CN106532009A Disclosed is a method for preparing a hard carbon composite negative electrode material for a high-capacity lithium-ion battery, which uses pitch and resin for solid-phase coating. The carbon layer coated by the preparation method is not uniform, and the product quality uniformity and stability are poor. Continuous production cannot be realized, and the production cost is relatively high; the Chinese patent with the publication number CN1032022446A discloses a silicon oxide / carbon negative electrode material for a lithium-ion battery and a preparation method thereof, which uses resin, pitch, etc. to be dissolved in an organic solvent for liquid Phase coating, complex procedures, difficult to achieve large-scale production and high production costs