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Preparation method of cathode active material of lithium ion battery

A cathode active material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor lithium ion mobility and electronic conductivity, negative impact on material rate performance, and easy peeling. Excellent capacity and cycle performance, good stability, and the effect of inhibiting the reaction rate

Active Publication Date: 2016-11-23
广西锰华科技投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium ion mobility and electronic conductivity of these substances are often poor, and the rate performance of the material is often negatively affected.
Moreover, the shell layer constructed by the coating method, because the shell layer is completely different from the core structure, is prone to peeling off due to volume changes during charging and discharging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The chemical formula of the positive electrode active material is Li 1.42 mn 0.31 Ni 0.25 Pb 0.02 o 2 , wherein x=0.31-0.35, y=0.25-0.28, z=0.02-0.04.

[0021] Weigh the corresponding raw materials according to the molar ratio of the chemical formula, mix and co-precipitate the solution containing manganese source, nickel source and lead source with the solution containing citrate ions, and control the mixing conditions to obtain the precursor slurry; preferably, add Co-precipitation of the ammonia solution; the controlled mixing conditions are as follows: the stirring speed is 500 rpm, the reaction temperature is from room temperature to 85° C., and the reaction time is ≥ 4 hours. Preferably, the concentration of the solution containing citrate ions is 0.5mol / L; the total concentration of nickel, manganese and lead ions in the solution of nickel source, manganese source and lead source is 0.5mol / L, and the precursor slurry The solid content of the material is 50g / ...

Embodiment 2

[0028] The chemical formula of the positive electrode active material is Li 1.33 mn 0.35 Ni 0.28 Pb 0.04 o 2 .

[0029]Weigh the corresponding raw materials according to the molar ratio of the chemical formula, mix and co-precipitate the solution containing manganese source, nickel source and lead source with the solution containing citrate ions, and control the mixing conditions to obtain the precursor slurry; preferably, add Ammonia solution is used for co-precipitation; the controlled mixing conditions are as follows: the stirring speed is 1000 rpm, the reaction temperature is from room temperature to 85° C., and the reaction time is ≥ 4 hours. Preferably, the concentration of the solution containing citrate ions is 1.5mol / L; the total concentration of nickel, manganese and lead ions in the solution of nickel source, manganese source and lead source is 1mol / L, and the precursor slurry The solid content is 150g / L, and the air inlet temperature during spray drying is 280...

Embodiment 3

[0036] The chemical formula of the positive electrode active material is Li 1.39 mn 0.32 Ni 0.26 Pb 0.03 o 2 .

[0037] Weigh the corresponding raw materials according to the molar ratio of the chemical formula, mix and co-precipitate the solution containing manganese source, nickel source and lead source with the solution containing citrate ions, and control the mixing conditions to obtain the precursor slurry; preferably, add Co-precipitation of the ammonia solution; the controlled mixing conditions are as follows: the stirring speed is 750 rpm, the reaction temperature is from room temperature to 85° C., and the reaction time is ≥ 4 hours.

[0038] Preferably, the concentration of the solution containing citrate ions is 0.75mol / L; the total concentration of nickel, manganese and lead ions in the solution of nickel source, manganese source and lead source is 0.75mol / L, and the precursor slurry The solid content of the material is 100g / L, and the air inlet temperature du...

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PUM

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Abstract

The invention discloses a preparation method of a cathode active material of a lithium ion battery. According to the method, modified lithium nickel manganese oxide is used as the cathode active material, so that the cathode active material is high in chemical stability and capacity, can well cooperate with aqueous electrolyte, and can suppress the reaction rate of side reaction; due to the modification of lithium nickel manganese oxide-doped lead, a modified material is high in stability in the aqueous electrolyte, so that generation of the side reaction between the material and the electrolyte interface is suppressed, and the cathode active material is excellent in capacity and circulating performance; as a complexing agent is mixed with lithium, a lithium source solution with high concentration is obtained under the action of the complexing agent; then the lithium source solution is mixed with a cathode active material precursor of the lithium ion battery and dried, so that an obtained mixture of the precursor and the lithium source is high in uniformity.

Description

Technical field [0001] The invention relates to a method for preparing a battery, in particular to a method for preparing a cathode active material of a lithium battery. Background technique [0002] Lithium-ion batteries are green, high-energy and environmentally friendly batteries that appeared in the 1990s. They have outstanding advantages such as high energy density, environmental friendliness, no memory effect, long cycle life, and less self-discharge. They are not only used in mobile phones, notebook computers, and portable measuring instruments. It is an ideal power source for small and lightweight electronic devices, and it is also an energy storage battery for electric vehicles, electric bicycle power sources, wind energy, and solar energy that are currently being industrialized. At this stage, the upgrading of electronic products and the rapid development of electric vehicles have put forward higher requirements for the energy density of lithium-ion batteries. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 钟凤珍
Owner 广西锰华科技投资有限公司
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