High-nickel-series and full-concentration gradient lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery, full concentration gradient technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of safety and poor cycle performance of positive electrode materials of ternary nickel-cobalt manganate lithium-ion batteries

Inactive Publication Date: 2016-05-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor safety and cycle performance of the positive electrode material of the ternary nickel-cobalt lithium manganate lithium ion battery prepared by the existing preparation method, and to provide a positive electrode with a high nickel-based full concentration gradient lithium ion battery Materials and their preparation methods

Method used

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  • High-nickel-series and full-concentration gradient lithium ion battery positive electrode material and preparation method thereof
  • High-nickel-series and full-concentration gradient lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a preparation method of a high nickel-based full-concentration gradient lithium-ion battery positive electrode material, comprising the following steps:

[0037]Step 1: Prepare solution A and solution B containing nickel salt, cobalt salt and manganese salt with a total concentration of 1 to 4 mol / L respectively; the ratio of nickel, cobalt and manganese in the solution A is preferably: 0.7~ 1.0: 0-0.5: 0-0.5, more preferably 0.8-0.85: 0.075-0.2: 0.1-0.2; the ratio of nickel, cobalt and manganese in the solution B is preferably: 0.1-0.5: 0-0.5 : 0.25~1.0, more preferably 0.4~0.6: 0.2: 0.2~0.4; the nickel salt, cobalt salt and manganese salt are not particularly limited, and the nickel salt is preferably nickel sulfate, nickel hydrochloride, nickel nitrate and acetic acid One or more of nickel salts; the cobalt salt is preferably one or more of cobalt sulfate, cobalt hydrochloride, cobalt nitrate and cobalt acetate; the manganese salt ...

Embodiment 1

[0043] The raw materials used in this experiment are nickel sulfate, cobalt sulfate, and manganese sulfate as metal salts, sodium hydroxide as alkali solution, ammonia water as complexing agent, and lithium hydroxide as lithium source. First prepare solution A with a ratio of 8:1:1 of nickel, cobalt and manganese with a total concentration of 2 mol / L, solution B with a ratio of 4:2:4, and prepare 4 mol / L of sodium hydroxide at the same time solution and 10mol / L ammonia water, the prepared solution B was added to solution A at a flow rate of 5L / h and mixed evenly, and the well-mixed solution A, sodium hydroxide solution and ammonia water were added at a flow rate of 10L / h at the same time In the reaction kettle, control the pH value to 11.0, the reaction temperature is 50°C, and the stirring speed is 300r / min. After the simultaneous addition of solution A and solution B is completed, stop the dripping of the alkali solution and complexing agent at the same time, and continue sti...

Embodiment 2

[0049] The raw materials used in this experiment are nickel chloride, cobalt chloride, and manganese chloride as metal salts, lithium hydroxide as the alkali solution, ammonia water and disodium edetate as the complexing agent, and lithium carbonate as the lithium source. First prepare solution A with a ratio of 0.85:0.075:0.075 of nickel, cobalt and manganese with a total concentration of 2mol / L, solution B with an element ratio of 0.5:0.2:0.3, and prepare 4mol / L of sodium hydroxide at the same time solution and 10mol / L ammonia water and disodium edetate solution, the prepared solution B was added to the solution A at a flow rate of 5L / h and mixed uniformly, the uniformly mixed solution A, sodium hydroxide solution, Ammonia water and disodium edetate solution were added into the reaction kettle at the same time at a flow rate of 10L / h, the pH value was controlled at 12.0, the reaction temperature was 55°C, and the stirring speed was 1200r / min. After the addition is finished, ...

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Abstract

The invention provides a high-nickel-series and full-concentration gradient lithium ion battery positive electrode material and a preparation method thereof and belongs to the field of lithium ion battery positive electrode materials. The structural formula of the positive electrode material is LiNixCoyMnzO2@LiNiaCobMncO2, wherein x is more than or equal to 0.7 and smaller than or equal to 1.0, y is more than or equal to 0.1 and smaller than or equal to 0.3, z is more than or equal to 0.05 and smaller than or equal to 0.1, a is more than or equal to 0.4 and smaller than or equal to 0.5, b is more than or equal to 0.1 and smaller than or equal to 0.3 and c is more than or equal to 0.25 and smaller than or equal to 0.3; the sum of the x, the y and the z is equal to 1, and the sum of the a, the b and the c is equal to 1; the positive electrode material is spherical and has a core-shell-type structure; in a process from a core of an inner core to the surface of a shell, the contents of nickel, cobalt and manganese are distributed in linear concentration gradient; the content of the nickel is gradually reduced, and the content of the cobalt is not changed or is gradually increased; and the content of the manganese is gradually increased. The invention further provides the preparation method of the high-nickel-series and full-concentration gradient lithium ion battery positive electrode material. The positive electrode material provided by the invention has high capability, high circulating performance and high safety performance.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries, and in particular relates to a high nickel-based full concentration gradient lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the increasing global demand for energy, under the tremendous pressure of traditional energy shortage and environmental pollution, words such as green travel and zero-pollution electric vehicles have become the focus of attention, among which power batteries for electric vehicles have become the main research hotspots. The power battery used in electric vehicles requires both high power density and high energy density. However, the cathode material has always been the main bottleneck restricting the excellent performance of lithium-ion batteries. [0003] At present, the commercial lithium-ion battery cathode materials mainly include LiCoO 2 , LiNiO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 牛利孙中辉韩冬雪焦连升高玉舟吴同舜
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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