Composite lithium ion battery positive electrode material and preparation method thereof

Abstract

The invention discloses a composite lithium ion battery positive electrode material and a preparation method thereof, and relates to the field of lithium ion batteries. The composite lithium ion battery positive electrode material disclosed by the invention is composed of spinel lithium manganate and a layered nickel-manganese binary material, wherein the mass ratio of the spinel type lithium manganate to the layered nickel-manganese binary material is 9:1, the spinel type lithium manganate has a laser particle size of 12.0-20.0 [mu]m and a distribution width of less than 1.0, and the layerednickel-manganese binary material has a laser particle size of 2.0-5.0 [mu]m. The preparation method comprises the step of mixing coated spinel type lithium manganate and a coated layered nickel-manganese binary material in an efficient mixing machine for 10-60 minutes. The composite lithium ion battery positive electrode material with spinel and a layered structure has the characteristic of low cost, and also has very good high-temperature performance and rate capability.

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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