Method for preparing lithium ion secondary battery positive electrode material LiNi0.5Co0.2Mn0.3O2 by adding high-polymer saccharides as forming media

A technology for forming media and secondary batteries, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problem of high cost of manufacturing plants, and achieve the effects of low requirements, excellent cycle performance and low-cost raw materials

Inactive Publication Date: 2015-04-29
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of by adding macromolecule sugar as forming medium to prepare lithium-ion secondary bat

Method used

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  • Method for preparing lithium ion secondary battery positive electrode material LiNi0.5Co0.2Mn0.3O2 by adding high-polymer saccharides as forming media
  • Method for preparing lithium ion secondary battery positive electrode material LiNi0.5Co0.2Mn0.3O2 by adding high-polymer saccharides as forming media

Examples

Experimental program
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Embodiment 1

[0041] Select nickel sulfate, cobalt sulfate and manganese sulfate as raw materials, configure them into a 2.5moL / L solution, add them into a four-necked flask and let it cool. Configure 15% ammonia water and 4moL / L sodium hydroxide. The ratio of ammonia water to the total molar amount of nickel, cobalt and manganese in nickel sulfate, cobalt sulfate and manganese sulfate solution is 0.3:1.

[0042] The prepared ammonia water was dripped into the solution with a constant pressure funnel, and complexed for 50 minutes. Sodium hydroxide was then added dropwise to control the pH of the solution to be about 12.

[0043] Prepare a soluble starch solution according to 0.5% of the molar amount of nickel, cobalt and manganese, and add it to the reaction solution. After aging for 15 hours, the filtered precursor was vacuum dried for 5 hours.

[0044] The dried precursor is mixed with lithium carbonate according to a certain ratio, and mixed by wet mechanical ball milling. Drying, ca...

Embodiment 2

[0048] Select nickel sulfate, cobalt sulfate and manganese sulfate as raw materials, configure a 2moL / L solution, and add it to a four-necked flask. Configure 15% ammonia water and 3moL / L sodium hydroxide. The ratio of ammonia water to the total molar amount of nickel, cobalt and manganese in nickel sulfate, cobalt sulfate and manganese sulfate solution is 0.8:1.

[0049] The prepared ammonia water was dripped into the solution with a constant pressure funnel, and complexed for 50 minutes. Sodium hydroxide was then added dropwise to control the pH of the solution to be about 12.

[0050] Potato starch solution is prepared according to 0.2% of the molar amount of nickel, cobalt and manganese, and added to the reaction solution. After aging for 15 hours, the filtered precursor was vacuum dried for 5 hours.

[0051] The dried precursor is mixed with lithium hydroxide according to a certain ratio, and mixed by wet mechanical ball milling. Drying, calcining with oxygen, the sin...

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Abstract

The invention relates to a method for preparing a LiNi0.5Co0.2Mn0.3O2 positive electrode material with good sphericity degree by adding saccharides to promote the forming of a lithium ion secondary battery LiNi0.5Co0.2Mn0.3O2 precursor. According to the adopted technical scheme, the method comprises the following steps: dissolving NCM salts into water to prepare an NCM salt solution, sequentially adding ammonia water and sodium hydroxide solution into the NCM salt solution by taking ammonia water as a complexing agent and sodium hydroxide as a precipitator under the conditions of nitrogen atmosphere and water bath of 30-70DEG C, stirring during reaction, adding carbonhydrate, filtering a reaction solution obtained in the last step, to obtain an NCM precursor, performing microwave drying, and then drying for 5 hours in a vacuum drying oven; mixing the precursor and lithium salt at proper ratio, and adding the obtained mixture into a wet-process mechanical ball mill for ball-milling and mixing; and performing high-temperature sintering on the mixture, obtained from the last step, at the temperature of 700-850DEG C, and grinding the sintered materials and screening with a 325-mesh sieve, to obtain a final product.

Description

technical field [0001] The invention mainly relates to a method for promoting the formation of nickel-cobalt-lithium-manganese-oxide precursors of lithium-ion secondary batteries by adding sugars, and then preparing nickel-cobalt-lithium-manganate cathode materials with better sphericity, which belongs to the key materials and technologies of lithium-ion batteries field. Background technique [0002] Due to the pressure of environmental pollution and energy shortage, countries are forced to find new energy sources and develop new means of transportation. At the same time, with the development of information technology, the urgent need of aerospace technology and modern weapons has led to the miniaturization of electronic instruments and equipment, and new electronic instruments and equipment are constantly coming out, such as notebook computers, digital cameras and mobile phones. The emergence of these products has accelerated the growth of demand for small discrete mobile ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博薛娟娟
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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