Tin oxide and porous carbon composite lithium ion battery anode materials

Abstract

Disclosed is a production method of tin oxide and porous carbon composite lithium ion battery anode materials. The production method comprises the following steps of step 1, producing HKUST-1; step 2, activating HKUST-1, removing an organic solvent, adding a tin chloride solution by an injection method under the condition that the air is isolated and fully impregnating a pore passage, wherein the pore passage is occupied by the organic solvent; step 3, removing the solvent to obtain a precursor, performing 600 DEG C of firing of a muffle furnace under the protection of the argon gas, performing trimesic acid ligand carbonization, performing copper and tin reduction and alloying and obtaining a high dispersion of copper and tin alloy and carbon compound; step 4, selectively removing copper through nitric acid, converting tin oxide into tin dioxide to be stored in the pore passage in the form of nanocrystallization and obtaining the high performance composite materials. The tin oxide and porous carbon composite materials produced by the production method are firm in compositing, simple in operation and uniform in product; the tin oxide and porous carbon composite materials are large in capacity, high in current density, high in coulomb efficiency and high in rate performance current density when being applied to the lithium ion battery anode materials; the mass production can be achieved and the production cost is low.

Description

technical field [0001] The invention belongs to the field of lithium ion battery negative electrode material preparation, in particular to a tin dioxide / porous carbon composite lithium ion battery negative electrode material. Background technique [0002] As an energy storage device that has been widely used in various electronic products and communication tools in recent years, lithium-ion secondary batteries will be gradually developed into multi-purpose power sources, which will comprehensively develop in the direction of safety, low cost and high specific capacity. develop. The anode material of lithium ion battery is the key factor to improve the reversible capacity and cycle life of lithium ion battery. At present, carbon materials are the main anode materials for commercial lithium-ion batteries. However, the lithium storage capacity of carbon is low, and the theoretical specific capacity is only 372mAh / g. Tin alloys and their compounds have high theoretical lithiu...

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Problems solved by technology

Of course, the preparation of this material is relatively complicated, and the performance cannot be guaranteed. A simple and effective method is urgently needed to solve the problem.

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