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High-compaction and high-stability high-nickel cathode material and preparation method thereof, and lithium ion battery

A high-stability, positive electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of deteriorating safety performance and cycle performance of lithium-ion batteries, difficulty in preparing pole pieces, fast water absorption of pole pieces, etc., and achieve excellent rate performance and uniform coating , the effect of increasing energy density

Active Publication Date: 2019-07-12
GUIZHOU RONGBAI LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There will be more LiOH and Li on the surface of the existing high-nickel cathode material 2 CO 3 Impurities lead to high pH value of high-nickel cathode materials, the slurry is prone to "jelly" shape, difficult to prepare pole pieces, fast water absorption of pole pieces, high water content, etc., thus deteriorating the safety performance and cycle performance of lithium-ion batteries

Method used

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  • High-compaction and high-stability high-nickel cathode material and preparation method thereof, and lithium ion battery
  • High-compaction and high-stability high-nickel cathode material and preparation method thereof, and lithium ion battery
  • High-compaction and high-stability high-nickel cathode material and preparation method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Prepare large particles with a median particle size of 10 microns and small particles with a median particle size of 3 microns:

[0065] Prepare nickel-cobalt mixed sulfate solution, prepare sodium metaaluminate solution, then pump 5 mol / L ammonia solution and 5 mol / L sodium hydroxide solution into the reactor in parallel, and control the Ni: Co: Al atomic ratio to 0.815: 0.15:0.035, the metal ion concentration of the mixed solution is 2.5mol / L. Control the reaction temperature to 45°C, the pH value to 10.0, and the ammonia value to 8g / L. Co-precipitation reaction is carried out. After the particle size reaches the requirement, solid-liquid separation and drying are carried out to obtain the nickel-cobalt-aluminum hydroxide precursor;

[0066] (2) Mix the size particle precursor prepared in (1) in a weight ratio of 3:1, then add lithium hydroxide and titanium oxide, and mix evenly in a high-speed mixer, wherein the molar ratio of Ni: Co: Al: Ti is 81.0:14.8:3.4:0.8...

Embodiment 2

[0075] (1) Prepare large particles with a median particle size of 13 microns and small particles with a median particle size of 4 microns:

[0076] Prepare nickel-cobalt-manganese mixed sulfate solution, then pump 8 mol / L ammonia solution and 5 mol / L sodium hydroxide solution into the reaction kettle in parallel, control Ni: Co: Mn atomic ratio to 0.90: 0.05: 0.05, the mixed solution The concentration of metal ions is 4.0mol / L. Control the reaction temperature to 50°C, the pH value to 11.5, and the ammonia value to 8g / L. Co-precipitation reaction is carried out. After the particle size reaches the requirement, solid-liquid separation and drying are carried out to obtain the nickel-cobalt-manganese hydroxide precursor;

[0077] (2) Mix the size particle precursor prepared in (1) in a weight ratio of 4:1, then add lithium hydroxide, lithium source and metal (Ni, Co, Mn) at a molar ratio of 1.03, and mix in a high-speed mixer Uniform;

[0078] (3) Put the ingredients in (2) int...

Embodiment 3

[0086] (1) Prepare large particles with a median particle size of 18 microns and small particles with a median particle size of 3 microns:

[0087] Prepare nickel-cobalt mixed sulfate solution, prepare sodium metaaluminate solution, then pump 6 mol / L ammonia solution and 5 mol / L sodium hydroxide solution into the reactor in parallel, and control the Ni: Co: Al atomic ratio to 0.92: 0.04:0.04, the metal ion concentration of the mixed solution is 4.0mol / L. Control the reaction temperature to 55°C, the pH value to 11.5, and the ammonia value to 6.5g / L. Co-precipitation reaction is carried out. After the particle size reaches the requirement, solid-liquid separation and drying are carried out to obtain the nickel-cobalt-aluminum hydroxide precursor;

[0088] (2) Mix the size particle precursor prepared in (1) in a weight ratio of 3:1, then add lithium hydroxide and zirconium oxide, and mix evenly in a high-speed mixer, wherein the molar ratio of Ni:Co:Al:Zr is 91.5 : 3.8: 3.8: 0....

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Abstract

The invention discloses a high-compaction and high-stability high-nickel cathode material and a preparation method thereof, and a lithium ion battery. The high-nickel cathode material comprises a basematerial and a coating layer coating the surface of the base material, the base material is a compound as shown in the formula I: LinNixMyO2, wherein in the formula I, 0.98<n<=1.20, 0.50<x<1.00, 0.00<y<1.00, and 0.00<x+y<=1.00; the base material is consisted of a large-particle substrate and a small-particle substrate; and M is at least one selected from a group consisting of lithium, manganese,aluminum, molybdenum, chromium, vanadium, lanthanum, scandium, cerium, niobium, molybdenum, cobalt, magnesium, zirconium, strontium, yttrium, barium, titanium, fluorine, silicon, boron and phosphorus.The cathode material prepared by the invention has low residual alkali, uniform primary particle coating, primary particle pressure resistance and difficult breakage, so that the prepared lithium ionbattery has high energy density, lower internal resistance and excellent rate capability, safety performance and cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-pressure, high-stability, high-nickel positive electrode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, light weight, no memory effect, and high energy conversion efficiency. They are the core part of new energy electric vehicles. The positive electrode material of the battery is the core component of the power battery, and its value accounts for about 15-20% of the entire electric passenger car and about 40-50% of the battery. In 2018, sales of new energy vehicles reached 1.256 million, an increase of 61.7% over the same period of the previous year, and China's power battery shipments were 65GWh, a year-on-year increase of 46%. GGII predicts that the demand for power batteries for electric vehicles in China will Presenting a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 王碧军袁徐俊佘圣贤黄洁文孙伟丽梅文捷于建黄连友岳旭佳金国山黄波王尊志
Owner GUIZHOU RONGBAI LITHIUM BATTERY MATERIAL CO LTD
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