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A kind of preparation method of porous rod-shaped cobalt-based lithium ion battery cathode material

A lithium-ion battery, rod-shaped structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of further improvement of electrochemical performance, slow diffusion of lithium ions, and low conductivity of lithium ions. Beneficial for electron transport, excellent electrochemical performance, and simple process

Active Publication Date: 2016-05-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although ternary or lithium-rich 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, ternary and lithium-rich materials have low lithium ion conductivity, and the lithium ion diffusion rate is slow during charge and discharge, which is not conducive to the improvement of electrochemical performance.

Method used

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  • A kind of preparation method of porous rod-shaped cobalt-based lithium ion battery cathode material
  • A kind of preparation method of porous rod-shaped cobalt-based lithium ion battery cathode material
  • A kind of preparation method of porous rod-shaped cobalt-based lithium ion battery cathode material

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Embodiment 1

[0032] Embodiment 1: Ternary LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Preparation of porous microrods

[0033] At room temperature, 2mL of 1M cobalt acetate solution was added dropwise to 30mL of 1M oxalic acid solution, and stirring was continued for 30 minutes after the dropwise addition was completed, so that cobalt oxalate precipitate was fully formed, and suspension A was obtained. Then 3mL of 1M cobalt acetate solution, 5mL of 1M nickel acetate solution and 5mL of 1M manganese acetate solution were fully mixed and added dropwise to the above suspension A while stirring, and after the dropwise addition was completed, the stirring reaction was continued for 6h, and then stood and aged for 12h to obtain Suspension B. The suspension B was centrifuged and separated to obtain a precipitate, which was washed with deionized water and ethanol in sequence, and then dried at 50°C for 12 hours to obtain a precursor powder. The precursor powder and lithium oxalate were fully mixed according t...

Embodiment 2

[0038] Embodiment 2: Ternary LiNi 0.5 co 0.2 mn 0.3 o 2 Preparation of porous microrods

[0039] At room temperature, add 450mL of 0.05M oxalic acid solution dropwise to 12mL of 0.05M cobalt nitrate solution, and continue stirring for 30min after the dropwise addition to fully form cobalt oxalate precipitate to obtain suspension A. Then fully mix 48mL of 0.05M cobalt nitrate solution, 150mL of 0.05M nickel nitrate solution and 90mL of 0.05M manganese nitrate solution and add dropwise to the above suspension A while stirring. After aging for 10 h, suspension B was obtained. The suspension B was centrifuged, separated to obtain a precipitate, washed with deionized water and ethanol in sequence, and then dried at 80° C. for 8 h to obtain a precursor powder. The precursor powder and lithium carbonate were fully mixed according to the molar ratio of 1:1.05, then calcined at 500°C in air for 4h, and then calcined at 700°C for 24h to obtain the target product LiNi 0.5 co 0.2 m...

Embodiment 3

[0040] Embodiment 3: Ternary LiNi 0.6 co 0.2 mn 0.2 o 2 Preparation of porous microrods

[0041] At room temperature, add 9mL of 0.2M cobalt acetate solution dropwise into 120mL of 0.2M ammonium oxalate solution, and continue stirring for 30 minutes after the dropwise addition to fully form cobalt oxalate precipitates to obtain suspension A. Then mix 6mL of 0.2M cobalt acetate solution, 45mL of 0.2M nickel acetate solution and 15mL of 0.2M manganese acetate solution and add them dropwise to the suspension A while stirring. After aging for 8h, suspension B was obtained. 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. The precursor powder and lithium hydroxide were fully mixed according to the molar ratio of 1:1.07, then calcined at 450°C in air for 8h, and then calcined at 750°C for 22h to obtain the target product LiNi 0.6 co 0.2 mn 0.2 ...

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Abstract

The invention discloses a preparation method of a positive pole material of a cobalt-based lithium ion battery with a porous rod-like structure. The preparation method is characterized by comprising the following steps: stirring one part of soluble cobalt salt solution and excess soluble oxalic acid solution for reaction, forming a cobalt oxalate precipitate, then fully mixing the remaining part of soluble cobalt salt solution, soluble nickel salt solution and soluble manganese salt solution, then adding drop by drop, performing complete reaction, then aging, centrifugating, washing, drying, further fully mixing with a lithium salt, calcining to obtain a target product, namely ternary LiNiaCo1-a-bMnbO2 porous microrods or lithium-rich xLi2MnO3.(1-x)LiNiaCo1-a-bMnbO2 porous microrods, wherein x is more than 0 and less than 1, a is more than 0 and less than 1, b is more than 0 and less than 1, and the sum of a and b is more than 0 and less than 1. The rod-like structure of the positive pole material prepared by the preparation method disclosed by the invention is conductive to electronic transmission and diffusion of lithium ions, and the relatively large specific surface area can enable the material to have excellent electrochemical properties.

Description

technical field [0001] The present invention relates to a method for preparing a positive electrode material of a chemical power source, in particular to a method for preparing a positive electrode material of a cobalt-based lithium ion battery with a porous rod structure, specifically a synthesis of ternary and lithium-rich series materials for lithium ion batteries method. 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 new cathode materials without cobalt or less co...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨则恒陆剑波张卫新张伟波马国谷和云
Owner HEFEI UNIV OF TECH