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Monocrystal lithium-rich manganese-based multi-component positive electrode material and preparation method

A lithium-rich manganese-based, cathode material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low tap density, limiting the practical application of lithium-rich manganese-based multi-component materials, and unfavorable electrode sheet rolling and preparation. , to achieve the effect of easy control, suitable for large-scale production and good product consistency

Inactive Publication Date: 2017-07-04
ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventionally synthesized lithium-rich manganese-based materials are generally secondary particles formed by the aggregation of small primary particles. More than 2.0 g / cm 3 )
This greatly limits the practical application of lithium-rich manganese-based multicomponent materials in power lithium-ion batteries

Method used

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  • Monocrystal lithium-rich manganese-based multi-component positive electrode material and preparation method
  • Monocrystal lithium-rich manganese-based multi-component positive electrode material and preparation method
  • Monocrystal lithium-rich manganese-based multi-component positive electrode material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Prepare sample 0.5Li 2 MnO 3 ·0.5LiNi 0.33 Mn 0.33 Co 0.33 O 2 . Dissolve nickel sulfate, manganese sulfate and cobalt sulfate in deionized water according to the stoichiometric ratio to form solution A with a metal ion concentration of 0.5 mol / L; configure a mixed solution B of sodium carbonate and sodium bicarbonate, in which sodium carbonate and carbonic acid The molar ratio of sodium hydrogen is 1:1, and the concentration of carbonate ions is 0.5mol / L; the solutions A and B are added dropwise to the beaker with a constant flow pump and continuously stirred at 50°C. The pH value is adjusted by ammonia water and maintained at 7.5. After the reaction is complete, the precipitate is aged for 6 hours at 50°C; the obtained precipitate is filtered and washed with deionized water several times, and dried in an oven at 100°C to obtain a carbonate precursor; weigh 1.05 times the stoichiometric ratio of hydroxide Lithium and carbonate precursors were crushed and ball milled for...

Embodiment 2

[0024] Prepare sample 0.5Li 2 MnO 3 ·0.5LiNi 0.45 Mn 0.45 Mg 0.1 O 2 . Weigh nickel acetate, manganese acetate and magnesium acetate according to the stoichiometric ratio and dissolve them in deionized water to form a solution A with a metal ion concentration of 2.0 mol / L; configure a mixed solution B of sodium carbonate and sodium bicarbonate, in which sodium carbonate and carbonic acid The molar ratio of sodium hydrogen is 3:1, and the concentration of carbonate ion is 2.0mol / L; the solutions A and B are added dropwise to the beaker with a constant flow pump and continuously stirred at 40°C. The pH value is adjusted and maintained at 8.0 with ammonia water. After the reaction is complete, the precipitate is aged for 24 hours at 40°C; the obtained precipitate is filtered and washed with deionized water several times, and dried in an oven at 100°C to obtain a carbonate precursor; weigh 1.1 times the stoichiometric ratio of lithium nitrate Crushing and ball milling with carbonat...

Embodiment 3

[0026] Prepare sample 0.4Li 2 MnO 3 ·0.6LiNi 0.32 Mn 0.32 Co 0.32 Al 0.03 O 2 . Weigh nickel nitrate, manganese nitrate, cobalt nitrate and aluminum nitrate according to the stoichiometric ratio and dissolve them in deionized water to form solution A with a metal ion concentration of 1.5 mol / L; configure a mixed solution B of sodium carbonate and sodium bicarbonate, in which carbonic acid The molar ratio of sodium to sodium bicarbonate is 2:1, and the concentration of carbonate ions is 1.5mol / L; use a constant flow pump to drop solutions A and B into the beaker and stir continuously at 55°C. Use ammonia to adjust the pH and maintain At 8.0, after the reaction is complete, the precipitate is aged for 10 hours at 55°C; the obtained precipitate is filtered and washed with deionized water several times, and dried in an oven at 100°C to obtain a carbonate precursor; the stoichiometric ratio is 1.08 times Lithium carbonate and carbonate precursor are crushed and ball milled for 1.0h,...

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Abstract

The invention relates to a monocrystal lithium-rich manganese-based multi-component positive electrode material and a preparation method. The molecular formula of the material is xLi<2>MnO<3>.(1-x)LiMO<2>, wherein x is greater than 0 and less than 1; and M is one or more of Mn, Ni, Co, Mg or Al. The preparation method comprises the following steps of 1) weighing soluble nickel salt, soluble cobalt salt, soluble manganese salt, soluble magnesium salt and soluble aluminum salt based on stoichiometric ratio of elements and dissolving into deionized water to form a solution A with metal ion concentration of 0.2-4mol / L; 2) configuring a mixed water solution B of sodium carbonate and sodium bicarbonate, wherein the concentration of carbanion is 0.2-4mol / L; 3) dropwise adding the solution A and the solution B to a beaker and stirring constantly to obtain precipitate, and performing aging on the precipitate for 4-24h; 4) performing filtering, washing and drying on the obtained precipitate to obtain a carbonate precursor; and 5) performing smashing and ball grinding on the carbonate precursor and then mixing with a lithium-containing compound, and carrying out calcining in two sections in an oxygen-rich atmosphere to obtain the monocrystal lithium-rich manganese-based multi-component positive electrode material with relatively high tap density. The preparation process is simple and industrialization can be achieved easily; and the prepared material is stable in crystal structure, high in volume ratio and energy density, and long in cycle life.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and specifically relates to a single crystal lithium-rich manganese-based multi-element cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 And its preparation method. Background technique [0002] With the rapid development of electric vehicles, the requirements for the energy density of lithium-ion power batteries are getting higher and higher. As an important part of the cathode material, it is the bottleneck that limits the increase in the energy density of lithium-ion batteries. Therefore, in order to increase the energy density of lithium-ion power batteries, the core is to develop new cathode materials with high discharge capacity. The most common commercial cathode material is LiCoO 2 、 LiMn 2 O 4 , LiFePO 4 , Li-Ni-Co-O and Li-Ni-Mn-Co-O materials, the actual discharge capacity of these materials does not exceed 200mAh / g, which is difficult to meet the needs of large-capacity bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCH01M4/485Y02E60/10
Inventor 王萌陈蕴博陈林
Owner ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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