Preparation method for ternary positive electrode material of lithium battery

A cathode material, lithium battery technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of lack of lithium ion channels, affecting electrochemical performance, hindering lithium ion transmission, etc., to reduce residual alkali content, The effect of improving cycle performance and improving safety

Inactive Publication Date: 2017-05-10
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, most of the commonly used coating materials are non-chemically active and do not have lithium ion channels, which will hinder the transmission of lithium ions to a certain extent and affect their electrochemical performance.

Method used

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  • Preparation method for ternary positive electrode material of lithium battery
  • Preparation method for ternary positive electrode material of lithium battery
  • Preparation method for ternary positive electrode material of lithium battery

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preparation example Construction

[0023] The invention provides a preparation method of a lithium battery ternary positive electrode material, comprising the following steps:

[0024] 1) Configure a certain concentration of iron nitrate (Fe(NO 3 ) 3 ) solution, the molar concentration range of the ferric nitrate solution is 0.01-0.1mol / L; slowly add a certain proportion of LiNi under stirring 1-x-y co x mn y o 2 (04 with LiNi 1-x-y co x mn y o 2 The mass ratio is 0.001 to 0.1; after stirring for 30 minutes, ultrasonically, and then drop a certain concentration of (NH 4 ) 2 HPO 4 solution, the (NH 4 ) 2 HPO 4 The molar concentration range of the solution is 0.01-1mol / L; continue stirring for 4-8h.

[0025] 2) The solution obtained in step 1) is filtered, washed with deionized water, and then dried at 80-120°C for 14-24h.

[0026] 3) keeping the powder obtained after drying in step 2) in an air atmosphere at 250-400° C. for 4-6 hours, and then naturally cooling to room temperature.

[0027] In ot...

Embodiment 1

[0029] 1) Prepare 1L ferric nitrate solution with a molar concentration of 0.02mol / L, slowly add 75.5g LiNi under stirring 1 / 3 co 1 / 3 mn 1 / 3 o 2 , after stirring for 30min, sonicate, and then dropwise add molar concentration of 0.02mol / L (NH 4 ) 2 HPO 4 Solution, continue to stir for 4h.

[0030] 2) After filtering and washing with deionized water, dry at 120° C. for 20 h.

[0031] 3) The dried powder is kept at 400° C. in an air atmosphere for 4 hours, and finally cooled to room temperature naturally.

Embodiment 2

[0033] 1) Prepare 1L ferric nitrate solution with a molar concentration of 0.01mol / L, slowly add 25.17gLiNi under stirring 0.5 co 0.3 mn 0.2 o 2 , stirred for 30min and then ultrasonically, then added dropwise NH with a molar concentration of 0.02mol / L according to the stoichiometric ratio 4 h 2 PO 4 Solution, continue to stir for 5h.

[0034] 2) After filtering and washing with deionized water, dry at 100°C for 16h.

[0035] 3) The dried powder is kept at 350° C. in an air atmosphere for 6 hours, and finally cooled to room temperature naturally.

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Abstract

The invention provides a preparation method for a ternary positive electrode material of a lithium battery. The preparation method comprises the following steps of 1) configuring a ferric nitrate solution at certain concentration, stirring and slowly adding LiNi<1-x-y>Co<x>Mn<y>O<2> (x is greater than 0 and less than 1, y is greater than 0 and less than 1) at certain proportion, stirring for a certain time and then performing ultrasonic processing, and dropwise adding a (NH<4>)<2>HPO<4> solution at certain concentration based on a stoichiometric ratio, and continuing to stir for 4-8h; 2) filtering the solution obtained in the step 1), washing by deionized water and then drying at a temperature of 80-120 DEG C for 14-24h; and 3) performing heat preservation on the powder dried in the step 2) at a temperature of 250-400 DEG C in air atmosphere for 4-6h, and then naturally cooling to room temperature. The invention provides the preparation method for the ternary positive electrode material of the lithium battery by adopting amorphous iron phosphate (FePO<4>) through coating treatment, so that the structural stability is improved, and the safety and cycling performance are improved; and the method has the advantages of simple process, convenience in operation, and high product consistency.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of lithium batteries, and in particular relates to a preparation method of a lithium battery ternary cathode material. [0003] 【Background technique】 [0004] The current lithium-ion batteries mainly include lithium iron phosphate batteries, lithium manganese oxide batteries, lithium cobalt oxide batteries and ternary batteries, and ternary batteries are famous for their high energy density, good cycle life, environmental friendliness and low price. It was quickly favored by the market and applied to digital batteries, electric vehicles and other fields. However, the gas production problem of pure ternary power batteries is relatively serious. The safety of batteries has always been a great technical challenge, making it difficult for pure ternary power batteries to pass Test conditions such as acupuncture and overcharge. [0005] Surface coating is a new technology to improve the electrochemical p...

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
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 刘晓艳王海涛
Owner OPTIMUM BATTERY CO LTD
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