A kind of composite lithium ion battery cathode material and preparation method thereof

Abstract

The invention discloses a composite type lithium ion battery cathode material and a preparation method thereof, and relates to the field of lithium ion batteries. The composite lithium-ion battery cathode material disclosed by the present invention is composed of spinel lithium manganese oxide and layered nickel-manganese binary material, and the mass of the spinel-type lithium manganate and the layered nickel-manganese binary material is The ratio is 9:1 to 7:3, the laser particle size of the spinel lithium manganate is 12.0 μm to 20.0 μm, the distribution width of the spinel lithium manganate is less than 1.0, and the layered nickel manganese The laser particle size of the binary material is 2.0 μm to 5.0 μm; its preparation method is to mix the coated spinel lithium manganese oxide and the coated layered nickel-manganese binary material in a high-efficiency mixer for 10 minutes ~60min. The invention provides a composite lithium-ion battery anode material with a spinel and layered structure, which has the characteristics of low cost and good high-temperature performance and rate performance.

Description

technical field [0001] The technical field of lithium battery materials of the present invention, in particular, relates to a composite lithium ion battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of economy and society, energy shortage and environmental pollution need to be solved urgently, and the development of low-cost, high-performance, and environmentally friendly new energy materials has become a top priority. As a new type of battery with high energy, excellent cycle performance, safety and environmental protection, lithium-ion battery has attracted much attention. It is widely used in portable electronic equipment, electric vehicles, military defense and other fields. Cathode material is one of the important factors affecting the performance of lithium-ion batteries, and it is also the most expensive component of the battery. Therefore, the development of lithium-ion battery cathode materials with e...

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Problems solved by technology

[0003] Among various cathode materials, spinel-type lithium manganese oxide has low cost, good safety, and three-dimensional lithium ion channels in its structure, so the rate performance is particularly good, but its cycle performance, especially at high temperature, has always been It has not been solved well. The spinel lithium manganese oxide on the market is generally made of electrolytic manganese dioxide. The particle size distribution is very wide, and it contains a lot of micropowder. The specific surface area of ​​the micropowder is large, and it is easy to have side reactions with the electrolyte, causing Dissolution, which is the main reason for its poor high temperature performance

[0004] Layered nickel-manganese binary materials also have the characteristics of low cost, but because they do not contain high-priced metal cobalt, they have poor conductivity and thus poor rate performance, and are not suitable for making large particle products, but if made into small particle products, Then its tap density and compaction density will be very low, thus greatly reducing the volumetric energy density of the battery

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