High-sphericility, compact-surface and low-impurity Ni-Co-Mn ternary material precursor and preparation method and application thereof

A technology of ternary materials and precursors, which is applied in the field of high-nickel nickel-cobalt-manganese ternary materials with high surface density, can solve the problem of high sulfur content, achieve low impurity content, good surface compactness, and particle size distribution narrow effect

Active Publication Date: 2018-10-02
安徽同心新材料科技有限公司
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Problems solved by technology

For example, the Chinese patent application number is 201711219583.7, and the name of the invention is a preparation method of a low-sodium content sulfur-nickel-cobalt-manganese three-element mixed hydroxide. The preparation method of the sulfur-nickel-cobalt-manganese three-element mixed hydroxide in this application, The method comprises the following steps: (1) preparation of raw materials; (2) pretreatment of raw materials; (3) preparation of dilute alkali; (4) co-precipitation; (5) aging; (6) washing; (7) drying, wherein aging The good slurry should be clarified naturally first, drain the supernatant, and then add dilute sodium hydroxide solution with a concentration of 0.5-1% to adjust the slurry. After mixing the slurry for 2±0.5 hours, use a centrifuge to filter the slurry. After drying, wash with dilute sodium hydroxide solution and deionized water respectively, and finally dry to obtain the low-sodium sulfur-nickel-cobalt-manganese three-element mixed hydroxide, but the sulfur-nickel-cobalt-manganese three-element mixed hydroxide prepared in this application Elemental mixed hydroxides are still high in sulfur

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  • High-sphericility, compact-surface and low-impurity Ni-Co-Mn ternary material precursor and preparation method and application thereof
  • High-sphericility, compact-surface and low-impurity Ni-Co-Mn ternary material precursor and preparation method and application thereof

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Embodiment 1

[0039] The molar ratio Ni / Co / Mn is 80:10:10 and takes by weighing 150.0g of nickel chloride, 17.8g of cobalt chloride, and 9.9g of manganese chloride, and dissolves nickel chloride, cobalt chloride, and manganese chloride in the Prepare a mixed solution with a total metal ion concentration of 1.8mol / L in ionized water; 4 + The molar ratio is 1.0, and 59.1mL of concentrated ammonia water with a mass fraction of 25% is added to the mixed solution; the temperature of the reaction system is controlled at 65°C, and the prepared solution and the prepared precipitant 6mol / L NaOH solution, 2.0mol / L The ammonium chloride solution of L (contain normal hexane in the ammonium salt solution used, and the total content of normal hexane is 1% of the total mass of the ammonium salt solution added) and flow into the reactor under agitation, the reactor will The pH value of the reaction system is controlled at 11.5; after the pH value of the reaction system is stable, the reaction is continued...

Embodiment 2

[0043] The molar ratio Ni / Co / Mn is 60:20:20 and takes by weighing 150.0g of nickel chloride, 50.1g of cobalt chloride, and 26.5g of manganese chloride, and dissolves nickel chloride, cobalt chloride, and manganese chloride in the Prepare a mixed solution with a total metal ion concentration of 2mol / L in ionized water; 4 + The molar ratio is 1.0, and 78.76mL of ammonia water with a mass fraction of 25% is added to the mixed solution; the temperature of the reaction system is controlled at 70°C, and the prepared solution and the prepared precipitant 6mol / L KOH solution, 3.0mol / L Ammonium chloride solution (containing toluene in the ammonium salt solution used, and the total content of toluene in the ammonium salt solution is 0.5% of the total mass of the ammonium salt solution added) and flows into the reactor under stirring, and the reactor The pH value in the solution was controlled at 11.4; after the pH value of the reaction system was stable, the reaction was continued for ...

Embodiment 3

[0045] Weigh 150.0g of nickel nitrate, 18.8g of cobalt nitrate, and 8.7g of manganese nitrate with a molar ratio of Ni / Co / Mn of 80:10:10, and dissolve nickel nitrate, cobalt nitrate, and manganese nitrate in deionized water to prepare a total metal A mixed solution with an ion concentration of 1.5mol / L; according to the sum of moles of metal elements and NH 4 + The molar ratio is 2.0, and 24.1mL of ammonia water with a mass fraction of 25% is added to the mixed solution; the temperature of the reaction system is controlled at 62°C, and the prepared solution and the prepared precipitant 6mol / L NaOH solution, 2.5mol / L Ammonium nitrate solution (containing ethylbenzene in the ammonium salt solution used, and the total content of ethylbenzene in the ammonium salt solution is 0.01% of the total mass of the ammonium salt solution added) and flows into the reactor under stirring, and the reaction The pH value in the kettle is controlled at 11.2; after the pH value of the reaction sy...

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Abstract

The invention discloses a high-sphericility, compact-surface and low-impurity Ni-Co-Mn ternary material precursor and preparation method and application thereof, and belongs to the technical field oflithium ion battery preparation. The preparation method comprises the following steps of dissolving a nickel source, a cobalt source and a manganese source compound in deionized water to prepare a solution with certain concentration; mixing the prepared solution and concentrated ammonia water, and combining with a precipitant and an ammonium salt solution to enter a reaction kettle for reaction; washing, re-pulping and re-washing the obtained precursor paste, and adding a certain amount of alkali solution during the re-pulping process; and performing spray drying, thereby obtaining the Ni-Co-Mn ternary material precursor. With the adoption of the method, the prepared Ni-Co-Mn ternary material precursor can be good in crystallinity, high in product sphericility, compact in surface and extremely low in impurity content in a product and can be used for a lithium ion battery positive electrode material-lithium nickel cobalt manganate with more excellent performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery preparation, and in particular relates to the preparation of a high-nickel-based nickel-cobalt-manganese ternary material precursor with high sphericity and dense surface through a metal ion co-precipitation process in a liquid phase system for sulfur reduction and impurity removal preparation The method can prepare lithium nickel cobalt manganese oxide with high electrochemical activity, a positive electrode material mainly based on the nickel cobalt lithium manganese oxide, and a secondary battery containing the positive electrode material. Background technique [0002] Lithium-ion batteries are favored because of their advantages such as high voltage, high energy density, long cycle life, and less environmental pollution. As the most critical material in lithium-ion batteries, the development of cathode materials is also the most worthy of attention. The ternary precursor is the mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 郭书成张素芳
Owner 安徽同心新材料科技有限公司
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