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Preparation method of positive pole material (spinel type lithium nickel manganese oxide) of high-voltage lithium ion battery

A technology for lithium ion batteries and cathode materials, applied in the field of materials, can solve the problems of side reactions of electrolyte, low crystallinity of products, large particle size, etc., and achieve the effects of increasing hydrothermal temperature, prolonging hydrothermal time, and uniform particles

Active Publication Date: 2013-07-31
南京时拓能源科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The solid-phase method has a simple process and is a good way to prepare LiNi 0.5 mn 1.5 o 4 The commonly used method, the preparation process is simple, a certain proportion of solid lithium source, nickel source and manganese source are ball milled and mixed, and then calcined, but the material prepared by this method is not uniform, and the particle size is large
High calcination temperature will lead to such as NiO or Li x Ni 1?x The appearance of O impurity, and lowering the temperature will make the crystallinity of the product low
The liquid-phase method includes co-precipitation method, sol-gel method and molten salt method, etc., and the raw materials can be mixed uniformly to prepare LiNi with small particle size. 0.5 mn 1.5 o 4 material, but this method is complicated in process, the small particle size makes it have a large specific surface area, and the side reaction with the electrolyte is serious

Method used

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  • Preparation method of positive pole material (spinel type lithium nickel manganese oxide) of high-voltage lithium ion battery
  • Preparation method of positive pole material (spinel type lithium nickel manganese oxide) of high-voltage lithium ion battery
  • Preparation method of positive pole material (spinel type lithium nickel manganese oxide) of high-voltage lithium ion battery

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specific Embodiment approach 1

[0022] Specific embodiment one: this embodiment prepares lithium nickel manganese oxide material according to the following steps:

[0023] Weigh 0.021mol Li(CH 3 COO), 0.01mol Ni(CH 3 COO) 2 and 0.03mol Mn(CH 3 COO) 2 , dissolved in 50ml of deionized water, stirred evenly; then added 10ml of absolute ethanol, stirred evenly; while stirring, slowly added 50ml of 2mol / L ammonium bicarbonate solution dropwise.

[0024] The above mixture was transferred to a 200ml hydrothermal reactor, reacted at 180°C for 5h, then evaporated with stirring at 80°C, and dried to obtain a precursor.

[0025] The above precursor was placed in a muffle furnace, pre-calcined at 400°C for 4 hours, calcined at 800°C for 10 hours, and then cooled at a rate of 0.5°C / min to obtain a lithium nickel manganate material.

[0026] Such as Figure 1-3 As shown, the particle size of the lithium nickel manganese oxide material prepared in this embodiment is about 1 μm, and the specific capacity can reach 140...

specific Embodiment approach 2

[0027] Specific embodiment two: this embodiment prepares lithium nickel manganese oxide material according to the following steps:

[0028] Weigh 0.021mol Li(CH 3 COO), 0.01mol Ni(CH 3 COO) 2 , 0.03mol Mn(CH 3 COO) 2 , dissolved in 50ml of deionized water, stirred evenly; then added 10ml of absolute ethanol, stirred evenly; while stirring, slowly added 50ml of 2mol / L ammonium bicarbonate solution dropwise.

[0029] The above mixture was transferred to a 200ml hydrothermal reactor, reacted at 160°C for 3h, then evaporated with stirring at 80°C, and dried to obtain a precursor.

[0030] The above precursors were placed in a muffle furnace, pre-calcined at 400°C for 3 hours, calcined at 800°C for 12 hours, and then cooled at 0.5°C / min to obtain a lithium nickel manganese oxide material with a particle size of about 0.5 μm. When discharged at 1C and 5C, the specific capacity can reach 142mAh / g and 120mAh / g, and it has good rate performance and cycle performance.

specific Embodiment approach 3

[0031] Specific embodiment three: this embodiment prepares lithium nickel manganese oxide material according to the following steps:

[0032] Weigh 0.01mol Li(CH 3 COO), 0.005mol Ni(CH 3 COO) 2 , 0.015mol Mn(CH 3 COO) 2 , dissolved in 50ml of deionized water, stirred evenly; added 10ml of absolute ethanol, stirred evenly; while stirring, slowly added 50ml of 1mol / L ammonium bicarbonate solution dropwise.

[0033] The above mixture was transferred to a 200ml hydrothermal reactor, reacted at 180°C for 5h, then evaporated with stirring at 80°C, and dried to obtain a precursor.

[0034] The above precursors were placed in a muffle furnace, pre-calcined at 400°C for 4 hours, calcined at 800°C for 10 hours, and then cooled at 0.5°C / min to obtain a lithium nickel manganese oxide material with a particle size of about 2 μm. When discharged at 1C and 5C, the specific capacity can reach 135mAh / g and 105.5mAh / g, and it has good rate performance and cycle performance.

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Abstract

The invention relates to a preparation method of a positive pole material (spinel type lithium nickel manganese oxide) of a high-voltage lithium ion battery, which comprises the following steps: simultaneously dissolving a lithium-containing compound, a manganese-containing compound and a nickel-containing compound instead of adding a lithium source afterwards, and ensuring that the lithium compound, the nickel compound and the manganese compound are evenly mixed; and adding precipitant to generate manganese-containing precipitate, wherein the generated manganese-containing precipitate provides crystal nuclei for further precipitation in the hydrothermal process, particles having different sizes can be obtained by controlling hydrothermal conditions, the particle sizes of the products can be increased by decreasing the concentrations of the metal salts, increasing the hydrothermal temperature and prolonging the hydrothermal time, and materials having different shapes can be obtained or porous materials can be prepared by adding different additives. The method omits the steps of filtration and water washing; and the synthesis process is economic and environment-friendly. The lithium nickel manganese oxide material prepared by the invention is in a spinel structure, and is high in crystallinity and excellent in electrochemical performance; and the specific capacity can be up to 130-142mAh / g, 120-135mAh / g and 105-120mAh / g in case of 1C, 2C and 5C rate discharge.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a preparation method of a lithium-ion battery cathode material, in particular to a preparation method of a lithium-ion battery cathode material spinel-type lithium nickel manganese oxide. Background technique [0002] In response to the global energy crisis, governments of various countries are actively promoting the development of new energy vehicles, mainly electric vehicles. Power battery is an important part of electric vehicle. directly affect the performance of electric vehicles. Lithium-ion batteries have the obvious advantages of high working voltage, no memory effect, low self-discharge rate, high energy density and long cycle life. As power batteries, they have broad application prospects. [0003] Among the current mainstream cathode materials, lithium iron phosphate cannot meet the needs of power batteries due to its low temperature performance and batch stability, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 王振波薛原金彦章张音顾大明尹鸽平
Owner 南京时拓能源科技有限公司
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