A kind of preparation method of lithium ion battery

A lithium-ion battery and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor lithium ion mobility and electronic conductivity, negative impact on material rate performance, and easy peeling, etc., to achieve Excellent anti-overcharge performance, inhibition of reaction rate, good flame retardancy

Active Publication Date: 2018-12-21
深圳仲瑞动力科技有限公司
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  • Description
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  • 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

[0040] Preparation of cathode active materials for lithium batteries

[0041] Using citrate co-precipitation-spray drying-high temperature roasting method, 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.

[0042]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 ion...

Embodiment 2

[0065] Preparation of cathode active materials for lithium batteries

[0066] Using citrate co-precipitation-spray drying-high temperature roasting method, the chemical formula of the positive electrode active material is Li 1.33 mn 0.35 Ni 0.28 Pb 0.04 o 2 .

[0067] 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, mang...

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PUM

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Abstract

The invention discloses a preparation method of a lithium ion battery. The lithium ion battery adopts modified lithium nickel manganese oxide as a positive active material which has good chemical stability and high capacity, can be well matched with an aqueous electrolyte, and inhibits the reaction rate of a side reaction, and is used with the electrolyte which comprises ionic liquid, additives, organic solvent, a flame retardant and lithium salt, so that the defect of narrow operating temperature range when the traditional organic solvent is used as the electrolyte of the lithium ion battery is overcome; the overcharge protecting performance of the lithium ion battery is excellent and other electrochemical properties of the battery are further not affected; the lithium ion battery is stable in electrochemical properties and good in flame retardancy when the battery is used at high temperature; according to the preparation method, the discharge capacities of the lithium ion battery at different discharge rates are obtained through the average first charged efficiency of the lithium ion battery at the different discharge rates and the charge capacity of the lithium ion battery, therefore, the formation time and capacity grading time of the lithium ion battery are greatly lowered.

Description

technical field [0001] The invention relates to a method for preparing a battery, in particular to a method for preparing a lithium ion 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. [0003] With the continuous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/56H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/56H01M10/0525Y02E60/10
Inventor 钟凤珍
Owner 深圳仲瑞动力科技有限公司
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