Core-shell polynary lithium ion battery anode material distributed in all-concentration gradient way and preparation method thereof

A full concentration gradient, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems affecting material specific capacity, structural instability, safety performance, etc., to improve safety performance and cycle performance , the effect of high cycle performance

Active Publication Date: 2015-08-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the increase of doping content, the electrochemical performance of the material is improved, but when the doping content is too high, the inactive doping elements seriously affect the specific capacity of the material.
2) The method of surface coating, such as in LiNi 0.8 co 0.1 mn 0.1 o 2 The surface is coated with a layer of LiNi 0.33 co 0.33 mn 0.33 o 2 , this method can improve the safety performance of the cathode material, but there are still problems such as poor structural stability and poor cycle performance.
3) The preparation of high-nickel-based cathode materials with a concentration gradient has also become a means to overcome the shortcomings of such materials, but the concentration-gradient materials prepared by this method still have the problem of outward diffusion of nickel ions in the core, making The material becomes structurally unstable during cycling and safety performance is compromised

Method used

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  • Core-shell polynary lithium ion battery anode material distributed in all-concentration gradient way and preparation method thereof
  • Core-shell polynary lithium ion battery anode material distributed in all-concentration gradient way and preparation method thereof
  • Core-shell polynary lithium ion battery anode material distributed in all-concentration gradient way and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 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 0.9:0.05:0.05 of nickel, cobalt, and manganese with a total concentration of 2mol / L, solution B with an element ratio of 0.6:0.2:0.2, and an element ratio of 0.62:0.19:0.19 solution C, and prepare 4mol / L sodium carbonate solution and 10mol / L ammonia water at the same time, add the prepared solution B to solution A at a flow rate of 5L / h and mix well, mix well mixed solution A, hydrogen Sodium solution and ammonia water were added to the reaction kettle at the same time at a flow rate of 10L / h, the pH value was controlled at 8.0, the reaction temperature was 40°C, and the stirring speed was 300r / min. After the solution A was added dropwise, the flow rate was 5L / h Add the solution C into the reaction kettle...

Embodiment 2

[0041] 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 an element ratio of 0.52:0.19:0.29 At the same time, prepare 4mol / L sodium hydroxide solution and 10mol / L ammonia water and disodium edetate solution, add the prepared solution B into solution A at a flow rate of 5L / h and mix well , Add the uniformly mixed solution A, sodium hydroxide solution, ammonia water and disodium ethylenediaminetetraacetic acid solution into the reaction kettle at the same time at a flow rate of 10L / h, control the pH value to 11.0, the reaction temperature is 60 ° C, the stirring speed The temperature is 12...

Embodiment 3

[0045] 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 acetate as 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 3 mol / L, solution B with an element ratio of 0.6:0.2:0.2, and an element ratio of 0.62:0.19:0.19 solution C, prepare 8mol / L sodium hydroxide solution and 12mol / L ammonia water at the same time, add the prepared solution B into solution A at a flow rate of 120L / h and mix well, and mix uniformly solution A with 250L The flow rate of / h is added to the reaction kettle, and the sodium hydroxide solution and ammonia water are simultaneously added to the reaction kettle at a flow rate of 100L / h, and the pH value is controlled to be 10. The reaction temperature is 50°C and the stirring speed is 700r / min After solution A was added dropw...

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Abstract

The invention relates to a core-shell polynary lithium ion battery anode material distributed in an all-concentration gradient way and a preparation method thereof, and belongs to the field of lithium ion battery anode materials. The structural formula of the anode material is LiaNixCoyMn1-x-yO2@LibNimConMn1-m-nO2, wherein a is more than or equal to 0.9 and less than or equal to 1.2, x is more than or equal to 0.6 and less than or equal to 0.9, y is more than or equal to 0.05 and less than or equal to 0.4, b is more than or equal to 0.9 and less than or equal to 1.2, m is more than or equal to 0.2 and less than or equal to 0.7, and n is more than or equal to 0.1 and less than or equal to 0.6. The anode material is spherical or sphere-like, and is of a core-shell structure; a core part is an all-concentration gradient part being 2-10 microns in diameter; a shell part is a protective layer part being 0.5-2 microns in thickness; the concentration of the protective layer part is an all-concentration gradient end-point concentration; and from the center of a core to the surface of a shell, the nickel content decreases gradually while the cobalt content and manganese content increase gradually. The material has the advantages of low cost, high cycle performance, high safety performance, high discharge capacity and the like. Moreover, the core-shell polynary lithium ion battery anode material is simple in process flow, and easy for realizing industrial production.

Description

technical field [0001] The invention relates to a core-shell type multi-element lithium-ion battery cathode material with full concentration gradient distribution and a preparation method thereof, belonging to the field of lithium-ion battery electrode materials. Background technique [0002] In recent years, with the intensification of energy consumption and the impact of environmental pollution and other issues, people have gradually developed new and renewable energy sources such as solar energy, wind energy, geothermal energy, and nuclear energy, and chemical power sources play an important role in the field of new energy. effect. As a new generation of secondary batteries, lithium-ion batteries have the advantages of high working voltage, high specific energy, low self-discharge rate, and no memory effect. They have great application prospects in 3C batteries, electric vehicles, military defense, etc., and become power batteries and The first choice for energy storage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 牛利高玉舟孙中辉吴同舜韩冬雪
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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