Preparation method of graphene lithium ion battery anode material doped with copper zinc tin sulfide

Abstract

The invention discloses a preparation method of a graphene lithium ion battery anode material doped with copper zinc tin sulfide. The method comprises the steps that copper acetate hydrate, zinc acetate, tin chloride dihydrate, sodium sulfide and graphene which are low in price serve as basic raw materials, the production cost is low, all the raw materials are easy to obtain, and the purity is guaranteed. Meanwhile, the mass ratio or the molar ratio of all reactants are easy to control in the production process, the operability is high, and practical production is facilitated. Graphene greatly improves the electro-chemical activity of an electrode and synergistically cooperates with a copper zinc tin sulfur base material, graphene and the copper zinc tin sulfur base material are interacted with each other, the situation that the copper zinc tin sulfur base material serves as the anode material is avoided, larger size expansion and contraction occur before or after lithium ions are inserted into or taken out, long-time safety, stability and reliability of the electro-chemical activity of the electrode are effectively guaranteed, and therefore the performance in all aspects such as electric conduction, capacity, charging and discharging and service life of a lithium ion battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a method for preparing copper-zinc-tin-sulfur-doped graphene lithium-ion battery negative electrode materials. Background technique [0002] In recent years, with the wide application and rapid development of lithium-ion batteries in portable electronic devices, hybrid vehicles, pure electric vehicles, etc., people have continuously put forward newer and higher requirements for the capacity and safety performance of lithium-ion batteries. The development of lithium-ion batteries with high specific capacity, long life and high safety performance has never stopped. Lithium-ion battery anode materials, as an important part of the battery, have also attracted more and more attention and attention. [0003] At present, the negative electrode materials of conventional lithium-ion batteries mainly include graphite, hard carbon, and hydrogen-containing carbon materials. Ma...

AI Technical Summary

Problems solved by technology

[0004] However, conventional tin-based materials are directly used as lithium-ion battery anode materials, and the volume of tin-based materials will undergo serious changes during the lithium-deintercalation process.

The tin-based negative electrode material is accompanied by a large volume expansion and contraction before and after lithium ion insertion and extraction, which leads to a large stress on the tin-based material. After many cycles, it will lead to cracking and powdering of the electrode or even from Problems such as peeling off of the current collector, resulting in the loss of electrochemical activity, resulting in a sharp decline in the cycle performance of lithium-ion batteries. At the same time, it is difficult to guarantee its performance in terms of conductivity, capacity, charge and discharge, and service life.

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