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

Active Publication Date: 2019-08-16
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of strong corrosivity of raw materials in the existing preparation and synthesis process and great harm to human body caused by long-term use, the present invention provides a high-nickel positive electrode material for lithium seco

Method used

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

Examples

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Embodiment 1

[0025] Take D50 as Ni of 12 μm 0.80 co 0.10 mn 0.10 (OH) 2 Precursor, lithium salt adopts the mixed lithium salt that is made up of lithium carbonate and lithium hydroxide monohydrate, and wherein lithium carbonate provides lithium salt and lithium hydroxide monohydrate provides the molar ratio of lithium salt to be 1:1, but total amount of lithium (in the form of The molar ratio) is Li / (Ni+Co+Mn)=1.08. The additive is 20 nm nano-zirconia, and the proportion of zirconium element is 0.005 mol. Calcined under the atmosphere for 10 hours, then roasted at 810°C for 15 hours in an oxygen atmosphere, crushed the calcined product through a 200-mesh sieve, and carried out under the conditions of washing temperature of 25°C, washing time of 40 minutes, and washing times of 1 times water. Washed with water, and then mixed with 20nm nano-zirconia evenly, the proportion of zirconium element added is 0.001mol, and after sintering at 700°C for 8 hours in an oxygen atmosphere, Li 1.08 Ni...

Embodiment 2

[0030] Take D50 as Ni of 8 μm 0.80 co 0.10 mn 0.10 (OH) 2 Precursor, lithium salt adopts the mixed lithium salt that is made up of lithium carbonate and monohydrate lithium hydroxide, and wherein lithium carbonate provides lithium salt and monohydrate lithium hydroxide provides the mol ratio of lithium salt to be 7:3, but total amount of lithium (in the form of The molar ratio) is Li / (Ni+Co+Mn)=1.06. The additive is 20 nm nano-magnesium hydroxide, and the proportion of magnesium element is 0.001 mol. Roast under oxygen atmosphere for 10 hours, and then roast under oxygen atmosphere at 790°C for 15 hours, crush the roasted product through a 200-mesh sieve, wash with water at a temperature of 25°C, a washing time of 20 minutes, and a washing ratio of 5 times , and then mixed evenly with 20nm nano-boron oxide, the amount of boron added was 0.015mol, and after sintering at 700°C for 8 hours in an oxygen atmosphere, Li 1.06 Ni 0.80 co 0.10 mn 0.10 Mg 0.001 B 0.01 5 o 2 ....

Embodiment 3

[0034] In embodiment 2, lithium salt adopts the mixed lithium salt that is made up of lithium carbonate and lithium hydroxide monohydrate, and wherein lithium carbonate provides lithium salt and lithium hydroxide monohydrate provides the mol ratio of lithium salt to be 9:1, but total lithium The amount (by molar ratio) is Li / (Ni+Co+Mn)=1.06. The additive is 20 nm nano-cerium fluoride, and the proportion of cerium element added is 0.001 mol. After mixing evenly with a ball mill, first Low temperature 720 °C under an oxygen atmosphere for 10 hours, and then at 785 °C for 15 hours under an oxygen atmosphere, followed by water washing, mixing with additives, and secondary sintering processes were the same as in Example 2 to obtain Li 1.06 Ni 0.80 co 0.10 mn 0.10 Ce 0.001 B 0.015 o 2 , The specific discharge capacity of the material obtained at 0.2C is 195 mAh / g, and the cycle retention rate is 88% after 80 cycles.

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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.

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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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M4/485H01M4/505H01M4/525H01M10/0525H01M10/4235Y02E60/10
Inventor 张锁江李晶晶刘艳侠马立彬张延强于天恒侯奥林
Owner 郑州中科新兴产业技术研究院
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