Preparation method of positive electrode of lithium battery

A lithium battery and lithium ion battery technology, applied in battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve the problem of poor lithium ion mobility and electronic conductivity, negative impact on material rate performance, and easy peeling off and other issues, to achieve the effect of stable collection and conduction of electrons, inhibition of reaction rate, and good matching

Active Publication Date: 2016-11-16
深圳仲瑞动力科技有限公司
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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

[0028] Preparation of cathode active materials for lithium batteries

[0029] 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.

[0030] 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 io...

Embodiment 2

[0044] Preparation of cathode active materials for lithium batteries

[0045] 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 .

[0046] 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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Abstract

The invention discloses a preparation method of a positive electrode of a lithium battery. According to the method, modified lithium nickel manganese oxide is adopted as a positive active material, so that the chemical stability is good, the capacity is high, the positive electrode can be well matched with an aqueous electrolyte; the reaction rate of side reaction is suppressed; the resistance of the overall positive electrode can be reduced by a conductive agent; and meanwhile, a conductive path among positive active material particles is strengthened. The material of a positive current collector is selected from one of a carbon-based material, a metal or an alloy. The carbon-based material is adopted as the positive current collector for the method, so that the positive electrode can play a role in stably collecting and conducting electrons in battery charging and discharging processes, and does not participate in battery reaction; and stable performance of the battery is ensured.

Description

Technical field [0001] The invention relates to a method for preparing a battery, in particular to a method for preparing a positive electrode 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. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/36H01M4/505H01M4/525H01M4/62H01M4/66H01M10/0525
CPCH01M4/1391H01M4/364H01M4/505H01M4/525H01M4/628H01M4/663H01M10/0525Y02E60/10
Inventor 钟凤珍
Owner 深圳仲瑞动力科技有限公司
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