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Preparation method of hollow-structured electrode material of lithium ion battery

A technology of lithium-ion batteries and hollow structures, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of further improvement in electrochemical performance, slow diffusion of lithium ions, unfavorable electrochemical performance, etc., to achieve favorable Effects of electron transport, multiple reactive active sites, and excellent electrochemical performance

Active Publication Date: 2017-08-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although ternary materials have many advantages compared with existing cathode materials, they still need to be further improved in terms of electrochemical performance.
In lithium-ion batteries, due to the low conductivity of lithium ions, the diffusion rate of lithium ions is slow during charging and discharging, which is not conducive to the improvement of electrochemical performance.

Method used

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  • Preparation method of hollow-structured electrode material of lithium ion battery
  • Preparation method of hollow-structured electrode material of lithium ion battery
  • Preparation method of hollow-structured electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: Ternary LiNi 0.8 co 0.1 mn 0.1 o 2 Preparation of hollow microtubes

[0059] The target product of this embodiment is LiNi 0.8 co 0.1 mn 0.1 o 2 , the precipitating agent used is oxalic acid solution, wherein the crystallinity of cobalt oxalate is lower than that of nickel oxalate and manganese oxalate. Therefore, the preparation method is as follows:

[0060] At room temperature, 5 mL of 1 M cobalt acetate solution was added dropwise to 150 mL of 1 M oxalic acid solution, and stirring was continued for 30 min after the addition was completed to fully form a cobalt oxalate precipitate to obtain suspension A. Then 40mL of nickel acetate solution with a concentration of 1M and 5mL of manganese acetate solution with a concentration of 1M were fully mixed, and then added dropwise to the above suspension A while stirring, and continued to stir for 8 hours after the dropwise addition to obtain suspension B. . Suspension B was centrifuged to obtain a pr...

Embodiment 2

[0065] Embodiment 2: Ternary LiNi 0.7 co 0.1 mn 0.2 o 2 Preparation of hollow microtubes

[0066] At room temperature, 20 mL of 0.1 M cobalt chloride solution was added dropwise to 600 mL of 0.1 M oxalic acid solution, and stirring was continued for 2.5 h after the dropwise addition to fully form a cobalt oxalate precipitate to obtain suspension A. Then 140 mL of nickel chloride solution with a concentration of 0.1M and 40 mL of manganese chloride solution with a concentration of 0.1M were fully mixed, and then added dropwise to the above suspension A while stirring, and stirred for 8 hours to obtain suspension B. Suspension B was centrifuged to obtain a precipitate, which was washed with deionized water and ethanol in sequence, and then dried at 80° C. for 12 h to obtain a precursor powder. Figure 7 It is the FESEM image of the precursor powder under different magnifications ( Figure 7 (a) and (b)) and TEM images ( Figure 7 (c)), it can be seen that the obtained prec...

Embodiment 3

[0070] Embodiment 3: Ternary LiNi 0.6 co 0.2 mn 0.2 o 2 Preparation of hollow microtubes

[0071] At room temperature, 60mL of 0.2M cobalt sulfate solution was added to 150mL of 0.4M oxalic acid solution, and stirred for 3 hours to fully form cobalt oxalate precipitate, and suspension A was obtained. Then 20mL of nickel sulfate solution with a concentration of 0.2M and 20mL of manganese sulfate solution with a concentration of 0.2M were fully mixed and added to the above suspension A, and stirred for 8 hours to obtain suspension B. Suspension B was centrifuged, separated to obtain a precipitate, washed with deionized water and ethanol in sequence, and then dried at 50° C. for 20 h to obtain a precursor powder. Figure 12 It is the FESEM image of the precursor powder under different magnifications ( Figure 12 (a) and (b)) and TEM images ( Figure 12 (c)), it can be seen that the obtained precursor is a hollow micron tubular structure.

[0072] The precursor powder and l...

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Abstract

The invention discloses a preparation method of a hollow-structured electrode material of a lithium ion battery. The preparation method is characterized by comprising the steps of enabling a salt solution of one kind metal element in a target product to be reacted with a precipitator to form a precipitate with low degree of crystallinity; then adding salt solutions of other metal elements to form precipitates with low degree of crystallinity and coating the surface of the precipitate with low degree of crystallinity to form a core-shell structure; enabling the inner layer of the core-shell structure to be diffused to the outer layer gradually so as to form a hollow-structured precursor with uniformly distributed elements; and performing calcining on the precursor to obtain the hollow-structured positive electrode material or negative electrode material of the lithium ion battery. By virtue of the hollow structure of the prepared electrode material, electron transport and lithium ion diffusion can be facilitated, and volumetric strain in a charging-discharging process can be buffered; and meanwhile, the electrode material has relatively large specific surface area, so that the contact area between the active material and an electrolyte can be improved, and the material obtains excellent electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a chemical power electrode material, in particular to a preparation method of a hollow structure lithium ion battery electrode material. Background technique [0002] In recent years, lithium-ion batteries have developed rapidly due to their advantages of high operating voltage, high energy density, long cycle life, wide operating temperature range, safety and no memory effect. Especially with the research and development of electric vehicles, lithium-ion batteries provide new power sources for them. However, due to the lack of resources, high price and high toxicity of the current commercial cathode material lithium cobalt oxide, there is an urgent need to replace lithium cobalt oxide with a new type of cathode material with no cobalt or less cobalt. Although lithium manganate cathode material is rich in resources, cheap and environmentally friendly, the development of lithium manganate is limited due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/52H01M4/48H01M10/0525
CPCH01M4/483H01M4/485H01M4/505H01M4/523H01M4/525H01M10/0525Y02E60/10
Inventor 张卫新陈飞杨则恒程凤如黄梦秋邵宗明
Owner HEFEI UNIV OF TECH
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