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Positive electrode of ternary material battery, preparation method thereof, and lithium ion battery

A material battery and positive electrode technology, applied in the field of ternary material battery positive electrode and its preparation, can solve problems such as unusable

Active Publication Date: 2021-03-26
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NCM811 cathode material can meet the requirements of high energy density power batteries, but its safety, cycle life and processing performance are greatly challenged, which makes this material unable to be used in lithium-ion power batteries of electric vehicles

Method used

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Examples

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preparation example Construction

[0026] The embodiment of the present invention also provides a method for preparing the positive electrode of the above-mentioned ternary material battery, which includes:

[0027] S1. After reacting the mixed solution of nickel salt and magnesium salt with sodium hydroxide, the first precursor is obtained.

[0028] Preferably, a mixed solution with a total concentration of nickel salt and magnesium salt of 0.5-2 mol / L, preferably 2 mol / L, is mixed with a sodium hydroxide solution of equal concentration to carry out the precipitation reaction. The equal concentration here means that the concentration of sodium hydroxide in the sodium hydroxide solution is equal to the total concentration of nickel salt and magnesium salt in the mixed solution, which is convenient for precipitation reaction to occur. Wherein, it should be noted that the solvents of the solutions mentioned in the present invention are preferably deionized water without any other impurities, unless otherwise spec...

Embodiment 1

[0056] A positive electrode of a ternary material battery, the molecular expression of its chemical composition is:

[0057] Li 0.95 Na 0.05 [Ni 0.78 Mg 0.02 ][Co 0.08 Al 0.02 ]Mn 0.1 o 2

[0058] The positive electrode of the ternary material battery is made by the following method:

[0059] S1. Prepare 0.78mol nickel acetate and 0.02mol magnesium acetate into a mixed solution with a total concentration of 2.0mol, add an equal concentration of sodium hydroxide solution and mix under stirring; adjust the pH value to 10 with concentrated ammonia water, and let it stand for 1h. Suction filtration, washing with deionized water for 3 times, and washing with a mixed solution of deionized water and absolute ethanol (1:1, V / V) for 2 to 3 times to obtain the first precursor.

[0060] S2. Prepare 0.08mol cobalt acetate and 0.02mol aluminum acetate into a mixed solution with a total concentration of 2.0mol, add an equal concentration of sodium hydroxide solution and mix under s...

Embodiment 2

[0067] A positive electrode of a ternary material battery, the molecular expression of its chemical composition is:

[0068] Li 0.92 Na 0.08 [Ni 0.75 Mg 0.05 ][Co 0.08 Al 0.02 ]Mn 0.1 o 2

[0069] The positive electrode of the ternary material battery is made by the following method:

[0070] S1. 0.75 mol of nickel nitrate and 0.05 mol of magnesium nitrate are prepared into a mixed solution with a total concentration of 1.0 mol, and the sodium hydroxide solution of the same concentration is added and mixed under stirring; the pH value is adjusted to 13 with concentrated ammonia water, and the mixture is allowed to stand for 3 hours. Suction filtration, washing with deionized water for 3 times, and washing with a mixed solution of deionized water and absolute ethanol (1:1, V / V) for 2 to 3 times to obtain the first precursor.

[0071] S2. 0.08mol cobalt nitrate and 0.02mol aluminum nitrate are prepared into a mixed solution with a total concentration of 1.0mol, and the ...

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Abstract

The invention provides a ternary material battery cathode and a preparation method thereof, and relates to the technical field of lithium ion batteries. On the basis of traditional NCM811, the ternarymaterial battery cathode uses sodium ions, magnesium ions and aluminum ions to carry out equivalent element doping. By the sodium ions, the magnesium ions and the aluminum ions, the crystal structureof the material is stabilized, structure collapse of material crystal lattices in a high-proportion lithium removing state during high-voltage charging is inhibited, moreover, side effects between nickel ions and cobalt ions which have high valence and electrolyte can be suppressed, and the circulating performance of the material is enhanced; and meanwhile, the ionic conductivity of the materialis enhanced, and the rate discharge performance of the material is improved. By the preparation method, directional doping of components is realized, because valence states and atomic radiuses are thesame or similar, isomorphous substitution can be realized, and the circumstance that effects are affected due to cation mixing in a substituting process is avoided. A lithium ion battery comprises the ternary material battery cathode, and has excellent high-energy density.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and in particular to a positive electrode of a ternary material battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries developed rapidly in the 1990s, and are widely used in small portable electronic communication products and electric vehicles. The manufacture of battery materials is the core link in the lithium battery industry. Battery materials are divided into positive electrode materials, negative electrode materials, separators, electrolytes, etc. Cathode material is one of the key materials for manufacturing lithium-ion batteries, accounting for more than 25% of the battery cost, and its performance directly affects various performance indicators of the battery, occupying a core position in lithium-ion batteries. [0003] However, all the positive electrode materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 郭孝东向伟吴振国钟本和
Owner SICHUAN UNIV
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