Method for preparing high-nickel cathode material for lithium secondary battery

A lithium secondary battery, cathode material technology, applied in secondary batteries, secondary battery repair/maintenance, battery electrodes, etc., can solve the problems of human injury, strong corrosion of raw materials, etc., and achieve long cruising range and stable crystal structure. , the effect of reducing the amount of
CN110137488AActive Publication Date: 2019-08-16郑州中科新兴产业技术研究院 +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
郑州中科新兴产业技术研究院
Publication Date
2019-08-16

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Abstract

The invention discloses a method for preparing a high-nickel cathode material for a lithium secondary battery. The method comprises the steps of weighing and uniformly mixing a nickel-cobalt-manganesecompound, a lithium salt and an additive I; calcining the mixture in two stages at high temperature in an oxygen atmosphere; cooling, sieving, water-washing the mixture; and mixing the mixture with an additive II for secondary sintering so as to obtain the high-nickel ternary cathode material, wherein the lithium salt is a mixed lithium salt of lithium carbonate and lithium hydroxide, and the lithium carbonate and the lithium hydroxide can be mixed in any mixing ratio. The method can prepare a material having a large capacity and excellent cycle performance, can reduce the amount of highly-corrosive lithium hydroxide, improves the preparation environment of high-nickel materials, cancels out the impact of lithium hydroxide price fluctuation on the price of the high-nickel ternary material, and has a good application prospect.
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Description

technical field

[0001] The invention relates to a positive electrode material for a lithium secondary battery and a preparation method thereof, in particular to a high-nickel positive electrode material composed of a high-nickel composite oxide and a preparation method thereof.

[0002] technical background

[0003] With the rapid development of new energy vehicles, the requirements for cruising range are getting higher and higher, and there are also higher challenges for the energy density, cycle performance and safety performance of lithium-ion batteries. High-nickel cathode materials, because of their high capacity and low cost, have become the focus of attention of cathode materials and have a very broad market in the field of power batteries.

[0004] Due to the high nickel content of high-nickel-based positive electrode materials, the radius of lithium ions (0.76 Å) is relatively close to that of divalent nickel (0.69 Å), which is prone to lithium-nickel mixing, which a...

Claims

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