Battery anode material obtained by pyrolyzation of 2-methylimidazole zinc salt

Abstract

The invention provides a battery anode material obtained by pyrolyzation of a 2-methylimidazole zinc salt. The battery anode material comprises the following components in percentage by mass: 10%-25% of nitrogen, not more than 10% of hydrogen and the balance of carbon, wherein the distribution rate of pores of which the internal diameters are smaller than 10nm in the material reaches over 90%; the specific surface area is high; ion migration diffusion is facilitated; the hydrogen content is smaller than or equal to 10%; the electrical conductivity is improved; the nitrogen content is 10%-25%; ion intercalation is facilitated by the structure; and the anode material is prepared from the zinc salt of 2-methylimidazole monovalent anions and can be applied to a button battery anode plate or an anode active filler. The battery anode material has the advantages that aza hierarchical pore carbon anode material prepared by the method is high in specific capacity, good in rate capability, good in long-period cycle performance, good in material compatibility and wide in application, and is suitable for a lithium-ion battery and a sodium-ion battery; the preparation method is simple; and industrial production is easy to achieve.

Description

Technical field [0001] The invention relates to the field of secondary batteries, in particular to a battery negative electrode material obtained by pyrolysis of 2-methylimidazole zinc salt. Background technique [0002] Lithium-ion batteries have become the most widely used daily energy storage element due to their high energy density and high voltage compared to dry batteries, and lithium-ion batteries also have excellent characteristics of no memory effect. However, the requirements for portability and high-capacity energy storage have made existing commercial lithium-ion batteries increasingly embarrassing, and there is an urgent need to increase their energy density and power density. Traditional commercial anode materials use graphite materials with a theoretical specific capacity of only 372mAh / g. Although the cycle performance is good, the specific capacity is low, and the performance is poor at high rates. It is prone to danger during high current charging and dischargin...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to address the above existing problems and provide a battery negative electrode material obtained by pyrolysis of 2-methylimidazole zinc salt. The negative electrode material has high specific capacity, good rate performance, and good long-term cycle performance. Ion batteries are also suitable for sodium-ion batteries, with good material compatibility and wide uses; the preparation method is simple and easy for industrial production; the material is used for pole pieces and button batteries containing the pole pieces to solve the problem of current negative electrode materials with limited capacity and high rate The problem of low performance, while solving the problem of complex preparation of high-capacity negative electrodes and difficulty in industrial scale production

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