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Carbonate precursor and preparation method and application thereof

A precursor and carbonate technology, applied in chemical instruments and methods, inorganic chemistry, electrical components, etc., can solve the problems of affecting the electrochemical performance of materials, uneven lithiation of ternary precursors, and complicated operations, and achieve cost Low, smooth surface, simple process effect

Active Publication Date: 2018-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis method involved in this patent is a two-stage synthesis, that is, the primary particles with a size of 1 μm to 7 μm are synthesized first, and then the primary particles are mixed with a nucleating agent for secondary precipitation reaction. The process is cumbersome and the operation is complicated.
Moreover, the particle size distribution range of the precursor is wide, and the overall particle size distribution is greater than 1. If the particle size distribution of the precursor is too wide, the lithiation of the ternary precursor will be uneven, which will affect the electrochemical performance of the material.

Method used

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  • Carbonate precursor and preparation method and application thereof
  • Carbonate precursor and preparation method and application thereof
  • Carbonate precursor and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and manganese sulfate monohydrate are weighed in a 6:2:2 molar ratio, and are configured into solution a together with p-toluenesulfonamide, wherein the total concentration of metal ions is 1mol / L. The growth agent is 20g / L.

[0060] The mixture of sodium bicarbonate and ammonia water was selected as the precipitant, the molar ratio was 50:1, and the total concentration of the mixed precipitant was 4mol / L. Add the mixture of sodium bicarbonate and ammonia water into pure water as solution b, and the concentration sum of sodium bicarbonate and ammonia water in solution b is 0.5mol / L. Add solution a and solution b into the reaction kettle in parallel. This process is a batch reaction process. After the solid-liquid separation is completed by the solid-liquid separation device, the solid particles return to the kettle to continue the reaction until the reaction is completed. The technological conditions in the react...

Embodiment 2

[0062] Nickel chloride hexahydrate, cobalt chloride hexahydrate, and aluminum chloride hexahydrate are weighed in a molar ratio of 8.0:1.5:0.5, and they are configured together with sodium bisbenzenesulfonimide to form solution a, wherein the metal ion concentration is 1.5mol / L, the growth promoter is 15g / L. Ammonium bicarbonate was selected as the precipitating agent, and the concentration was 3mol / L ammonium bicarbonate solution. This ammonium bicarbonate solution was added to pure water to obtain solution b, and the concentration of solution b was 0.8 mol / L. Add solution a and precipitant solution b into the reaction kettle in parallel. This process is a batch reaction process. After the solid-liquid separation is completed by the solid-liquid separation device, the solid particles return to the kettle to continue the reaction until the reaction Finish. The technological conditions in the reaction process are: reaction temperature 45° C., pH 8.2, stirring speed 550 rpm. ...

Embodiment 3

[0064] The ternary precursor prepared in Example 2 was placed in a muffle furnace and calcined at 550° C. for 5 hours to fully decompose the carbonate and obtain spherical ternary oxide particles. The ternary oxide particles and lithium hydroxide were mixed at a ratio of 1:1.05, and sintered at a temperature of 800° C. for 12 hours in an oxygen atmosphere in a muffle furnace to obtain a ternary positive electrode material. The 1C cycle performance was tested in the voltage range of 2.8V-4.3V. The first charge and discharge efficiency was 85%, the first discharge capacity was 180.5mAh / g, and the capacity retention rate after 100 cycles was 95.4%.

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Abstract

The invention discloses a carbonate precursor and a preparation method and application thereof. The precursor has a molecular formula of (NixCoyMz)(CO3)1-k(OH)2k, wherein M is one of Mn, Al, Ti, Cr, V, Sn, Zr, Fe, B and a rare earth element. The preparation method comprises the following three steps: 1) mixing nickel-cobalt-manganese salt or nickel-cobalt-aluminum with a growth promoting agent toobtain a solution a; 2) mixing the solution a with a precipitating agent to form a solid precipitate; 3) washing the solid precipitate obtained after reaction, and filtering and drying to obtain the precursor. The method has the characteristics of simple process, short process, low cost and environmental protection. The precursor obtained by the process has large particles and a narrow particle size distribution range and can be applied to preparation of positive electrode material of a lithium ion battery.

Description

technical field [0001] The invention relates to a carbonate precursor and its preparation method and application. Background technique [0002] Ternary materials (such as nickel-cobalt-manganese or nickel-cobalt-aluminum) have high energy density and good stability, and can be used as positive electrode materials for new energy vehicle power lithium-ion batteries. However, at present, the median particle size of ternary cathode materials is 10-15 μm, which cannot meet the requirements of high energy density, high compaction, high voltage, and high cycle performance of high-performance lithium-ion batteries. [0003] Generally speaking, the larger the particles of the ternary cathode material, the better the compaction density and high voltage performance; the narrower the particle size distribution, the better the processing performance and the higher the electrochemical consistency of the particles. The particle size and distribution of ternary cathode materials are inheri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/58H01M10/0525
CPCC01G53/006C01P2004/03C01P2004/61H01M4/5825H01M10/0525Y02E60/10
Inventor 胡国荣杜柯彭忠东章翔
Owner CENT SOUTH UNIV
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