Preparation method of graphene nano copper composite material for lithium ion battery cathode material

Abstract

The invention discloses a preparation method of a graphene nano copper composite material for a lithium ion battery cathode material. The preparation method comprises the following steps of: A, preparing glue: dissolving cellulose in water to prepare cellulose glue; B, preparing a metal paste: mixing copper powder with glue in the step A to prepare a paste; C, preparing a composite material: adding copper oxide powder and cuprous oxide powder into the paste in the step B and uniformly mixing the mixture to obtain mixed particles; and C, performing reductive calcining on the mixed particles prepared in the step C to obtain a composite material of graphene and nano copper balls. According to the preparation method, a three-dimensional conductive material is prepared by compounding the nano copper balls and the graphene, and the three-dimensional conductive material is applied to the conductive field of assisting active substances of the lithium ion battery.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery, in particular to a preparation method of a graphene nano-copper composite material used for the negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion battery: It is a secondary battery (rechargeable battery) that mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Batteries generally use materials containing lithium elements as electrodes, which are representatives of modern high-performance batteries. [0003] The negative electrode of the lithium...

AI Technical Summary

Problems solved by technology

However, the disadvantages of graphite negative electrode are: poor compatibility with electrolyte, low reversible capacity for the first charge and discharge, not suitable for high current charge and discharge, and poor cycle performance

[0006] Although the existing lithium alloy anode materials have high energy density, they have poor cycle stability

The theoretical capacity of silicon-based anode materials is high, but the volume change is large, resulting in the pulverization of the alloy and a sharp drop in capacity

The structure and volume of tin-based anode materials do not change significantly after lithium storage, and the cycle performance is good, but the lithium storage capacity is limited

[0007] In addition, graphene is used as the negative electrode material in the prior art. Graphene is a two-dimensional material, which is excellent in conductivity on a two-dimensional plane, but has a certain lack of conductivity in the Z-axis direction.

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