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High-nickel and low-cobalt ternary cathode material and preparation method thereof

A cathode material and high nickel technology, which is applied in the field of high nickel and low cobalt ternary cathode materials and their preparation, and can solve the problems of poor thermal stability, poor cycle performance and poor safety of high nickel and low cobalt ternary cathode materials. , to achieve the effect of improving thermal stability and safety performance, inhibiting cation mixing, and excellent cycle performance

Inactive Publication Date: 2018-11-06
SICHUAN FUHUA NEW ENERGY HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the invention provides a high-nickel and low-cobalt ternary positive electrode material and a preparation method thereof, which is combined with the existing lithium-ion battery positive electrode material layered high-nickel-nickel-cobalt lithium manganate (LiNi 0.5 mn 0.3 co 0.2 o 2 、LiNi 0.6 mn 0.2 co 0.2 o 2 、LiNi 0.8 mn 0.1 co 0.1 o 2 etc.), the present invention has not only effectively solved the problems of high cobalt content, high cost, and low specific capacity of current ternary positive electrode materials, but also the bulk phase doping of M ions has also solved the problem of thermal stability of high nickel and low cobalt ternary positive electrode materials. Poor performance, poor safety, and poor cycle performance

Method used

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  • High-nickel and low-cobalt ternary cathode material and preparation method thereof
  • High-nickel and low-cobalt ternary cathode material and preparation method thereof
  • High-nickel and low-cobalt ternary cathode material and preparation method thereof

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Embodiment 1

[0034] A kind of high-nickel low-cobalt ternary cathode material, chemical formula is Li[Ni 0.975 co 0.0125 mn 0.0125 ] 0.9875 sc 0.0125 o 2 , its preparation method comprises the following steps:

[0035] (1) according to the mol ratio of Ni, Co and Mn is 0.975:0.0125:0.0125, take by weighing 0.975mol nickel sulfate raw material, 0.0125mol cobalt sulfate raw material and 0.0125mol manganese acetate raw material respectively, mix, it is placed in deionized water, Heat to 55°C, stir and dissolve to obtain solution A;

[0036] (2) Dissolve 2.0 mol of sodium hydroxide in deionized water to form a sodium hydroxide solution with a concentration of 4.0 mol / L, then feed nitrogen and reduce the solution to room temperature, then add an equal volume of ammonia solution and stir Mix evenly to obtain solution B;

[0037] (3) 0.0125mol Sc(NO 3 ) 3 Dissolve in 100ml deionized water to obtain solution C with a concentration of 0.125mol / L;

[0038] (4) Slowly add solution B to solu...

Embodiment 2

[0045] A kind of high-nickel low-cobalt ternary cathode material, chemical formula is Li[Ni 0.975 co 0.0125 mn 0.0125 ] 0.975 sc 0.025 o 2 , its preparation method comprises the following steps:

[0046] (1) According to the molar ratio of Ni, Co and Mn is 0.975:0.0125:0.0125, respectively weigh 0.975mol nickel sulfate source raw material, 0.0125mol cobalt sulfate source raw material and 0.0125mol manganese sulfate source raw material, mix, place it in 500ml Heat to 50°C in deionized water, stir and dissolve to obtain solution A;

[0047] (2) Dissolve 2.0 mol of sodium hydroxide in deionized water to form a sodium hydroxide solution with a concentration of 4.0 mol / L, then pass in nitrogen gas and lower the solution to room temperature, then add an equal volume of ammonia solution, stir and mix Evenly, solution B is obtained;

[0048] (3) 0.025mol Sc(NO 3 ) 3 Dissolve in 200ml deionized water to obtain solution C with a concentration of 0.125mol / L;

[0049] (4) Slowly...

Embodiment 3

[0054] A kind of high-nickel low-cobalt ternary cathode material, chemical formula is Li[Ni 0.975 co 0.0125 mn 0.0125 ] 0.9875 Zr 0.0125 o 2 , its preparation method comprises the following steps:

[0055] (1) According to the molar ratio of Ni, Co and Mn being 0.975:0.0125:0.0125, respectively weigh 0.975mol nickel sulfate source raw material, 0.0125mol cobalt sulfate source raw material and 0.0125mol manganese acetate source raw material, mix, and place it in 500ml Heat to 55°C in deionized water, stir and dissolve to obtain solution A;

[0056] (2) Dissolve 2.0 mol of sodium hydroxide in deionized water to form a sodium hydroxide solution with a concentration of 4.0 mol / L, then feed nitrogen and reduce the solution to room temperature, then add an equal volume of ammonia solution and stir Mix evenly to obtain solution B;

[0057] (3) 0.0125mol Zr(NO 3 ) 4 Dissolve in 100ml of deionized water to obtain zirconium nitrate solution C with a concentration of 0.125mol / L;...

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Abstract

The invention discloses a high-nickel and low-cobalt ternary cathode material and a preparation method thereof. The chemical general formula of the material is Li[Ni0.975Co0.0125Mn0.0125]1-xMxO2, wherein x is mole percent and is greater than or equal to 0.01 and is smaller than or equal to 0.05; M is one or a combination of Sc, Y, Zr, Ti, Mg or Al. The preparation method comprises the following steps: preparing a precursor by adopting a co-precipitation method; then synthesizing a cathode material which contains excessive lithium and is doped with M ions by adopting a simple solid phase method; the cost of a product is low; the preparation method of the high-nickel and low-cobalt ternary cathode material has the advantages of simplicity and easiness in control, wide source of raw materialsand easiness in industrial production; the prepared material has the advantages of good crystallinity, no impurity phase, fine and evenly-distributed particles as well as high discharge capacity andexcellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a high-nickel and low-cobalt ternary cathode material and a preparation method thereof. Background technique [0002] Under the pressure of increasing global environmental pollution, the need for new energy is becoming more and more urgent. With the deepening of people's understanding of traditional fossil energy, the acceptance of new energy vehicles, especially long-range electric vehicles, is getting higher and higher. Driven by the research and development of new energy materials and related industries, in order to meet people's high requirements, lithium-ion battery cathode materials are rapidly moving towards higher quality energy density, volumetric energy density, long cycle life, high safety and lower cost. develop. Among the current wide variety of positive electrode materials, the industrialized positive electrode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘兴泉刘一町张萍何泽珍朱虹
Owner SICHUAN FUHUA NEW ENERGY HIGH TECH CO LTD
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