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Preparation method of single-crystal-morphology lithium ion battery ternary positive material

A lithium-ion battery, cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of reduced capacity retention, inability to obtain carbon coating, and particularly obvious impact on battery cycle performance, to overcome the problem of easy agglomeration. Effect

Active Publication Date: 2015-10-14
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the existence of gaps between the primary particles of the secondary spherical particles, when the surface coating treatment is carried out on this positive electrode material, the surface of some primary particles in the gaps of the secondary spherical particles cannot be coated with carbon; this is difficult to avoid This leads to the deterioration of the overall electronic conductivity of the secondary particles, especially the impact on the battery cycle performance. After a certain period of time, the battery made of this positive electrode material will have a large decrease in capacity retention.

Method used

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  • Preparation method of single-crystal-morphology lithium ion battery ternary positive material
  • Preparation method of single-crystal-morphology lithium ion battery ternary positive material
  • Preparation method of single-crystal-morphology lithium ion battery ternary positive material

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Embodiment 1

[0041]Preparation of cathode material:

[0042] 1) This step is exactly the same as step 1) of Comparative Example 1;

[0043] 2) Weigh 100g of the precursor obtained from step 1) and put it into a crucible, then add 0.5g of lithium fluoride (auxiliary agent), grind and mix evenly, put them together in a high-temperature muffle furnace at 900°C in an air atmosphere Sintering, the holding time is 6 hours, to obtain spherical oxide powder;

[0044] 3) Mix the product obtained in the above steps with 50.8g of lithium carbonate, grind it for 4 hours to make it evenly mixed; carry out sintering at 970°C in a muffle furnace under an air atmosphere, and the holding time is 12 hours;

[0045] 4) Ball mill and disperse the powder prepared in step 3) for 4 hours, pass through a 200-mesh sieve, put the sample in a crucible, put it into a high-temperature muffle furnace for sintering at 1000°C, and keep it for 10 hours to obtain a single crystal The morphology of the positive electrode ...

Embodiment 2

[0048] Preparation of cathode material:

[0049] 1) The cathode material precursor was synthesized by co-precipitation method, and 2 mol / L metal salt (both nitrate) mixed solution, 2 mol / L NaOH solution, and 3 mol / L ammonia solution were added dropwise into the reaction vessel. The molar ratio of nickel element, cobalt element and manganese element contained in the solution is 5:2:3 and the valence of the elements is +2. The pH value of the control system is 10.0, and the water bath is heated to 50°C; after 12 hours of reaction, filter, After washing and vacuum drying at 120 °C for 8 h, the flower cluster precursor (Ni 1 / 2 co 1 / 5 mn 3 / 10 )(OH) 2 , its D50 is about 4μm, and its BET is about 130m 2 / g;

[0050] 2) Weigh 100g of the precursor obtained from step 1) into the crucible, then add 0.5g of boron oxide (auxiliary), grind and mix evenly, put them together in a high-temperature muffle furnace and sinter at 600°C in an air atmosphere , the holding time is 10 hours, an...

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Abstract

The invention discloses a preparation method of a single-crystal-morphology lithium ion battery ternary positive material. The method comprises the following steps: (1) preparing an inflorescence-shaped ternary positive material precursor particles by clustering lamellar primary particles in a coprecipitation method, wherein the D50 of the precursor particles is 2-5micron, the BET is more than 100m<2> / g, and the valences of nickel, cobalt and manganese are +2; (2) mixing a precursor obtained by adopting the coprecipitation method with auxiliaries to obtain a mixture 1, and performing high-temperature sintering on the mixture 1 at the temperature between 600-950 DEG C so as to obtain a round-likely roundness type oxide; (3) mixing the round-likely roundness type oxide precursor obtained by the high-temperature sintering with a lithium salt so as to obtain a mixture 2, and performing sintering on the mixture 2 at the temperature between 700-1000 DEG C so as to obtain a product; and (4) dispersing the product obtained by sintering in the step (3), and performing heating treatment on the dispersed product at the temperature between 780-1000 DEG C so as to obtain the single-crystal-morphology lithium ion battery ternary positive material. The prepared positive material is made from the uniform single-crystal primary particles with good dispersibility, and the problem that the primary particles are easy to cluster in the high-temperature sintering process in a conventional method can be effectively overcome.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to a preparation method of a lithium ion battery ternary cathode material with a single crystal morphology. Background technique [0002] As a new type of green power supply, lithium-ion batteries have the advantages of high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and no environmental pollution. Therefore, they are widely used as mobile phones, notebook computers, digital cameras, etc. At the same time, lithium-ion batteries are also power sources for electric vehicles and energy storage power sources for solar renewable energy. [0003] The core link in the lithium-ion battery industry is the manufacture of battery materials. The performance of batteries depends to a large extent on the performance of cathode materials. Among them, nickel-cobalt-manganese ternary materials are one of the...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 钱柳吴振豪何金华阮丁山柳娜高旭光
Owner CONTEMPORARY AMPEREX TECH CO
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