Method of preparing tin-copper-nickel-cobalt alloy cathode material by two-step plating

Abstract

The present invention relates to a process for preparing tin-cuprum-cobalt-nickel alloy material materials by utilizing two-step electric plating. Said process consists of two steps of electric plating courses such as modification layer electric plating and activation layer electric plating, wherein said modification layer plating solution consists of nickelous chloride of 50-280g, cobalt chloride of 10-180g, boracic acid of 1-50g and distilled water of 800-900mL, with a temperature of 20-75 DEG C and an electric plating time for 0.2-30 minutes; the activation layer plating solution consists of sodium stannate of 5-60g, sodium hydrate of 5-60g, sodium acetate of 5-50g and distilled water of 800-900mL, with a temperature of 40-80 DEG C and an electric plating time of 0.2-50 minutes. Said two steps of electric plating are carried out at any electric current density of the siding-to-siding block of 0.1-1.5 A / dm2. The raw material in accordance with the present invention has a lower cost and a wide source, with a simple preparing process and few time consumption. Said electrode material possesses excellent discharging performances and charging-discharging cycling stability, with its first discharge capacity being higher than 400mAh activity material, exhibits excellent circulation performances, can have application in lithium ion battery, lithium battery, polymer lithium ion battery, especially thin film-type power cell.

Description

technical field [0001] The invention relates to a method for preparing a tin-copper-nickel-cobalt alloy negative electrode material by two-step electroplating. The alloy prepared by the method has important applications in the field of batteries, especially in the field of thin-film lithium ion batteries. technical background [0002] With the continuous introduction of mobile electronic products, the performance requirements for lithium-ion batteries are getting higher and higher, and the quantity requirements are increasing. At present, the anode materials of commercial lithium-ion batteries are mainly graphitized carbon materials. The disadvantage of this material is that the SEI film generated by the first discharge will lead to high irreversible capacity loss. Graphitized carbon materials may cause battery failure or cause safety issues due to the decomposition of the protective layer at high temperatures. As a potential substitute for graphitized carbon anode materia...

AI Technical Summary

Problems solved by technology

Studies have shown that despite the above improvement efforts, these tin-based anode materials still show a large volume expansion rate and a large capacity decay during the charge-discharge cycle, especially the irreversible capacity of the first cycle.