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Coated ternary precursor, preparation method thereof and positive electrode material containing coated ternary precursor

A technology of positive electrode materials and precursors, applied in the direction of electrical components, battery electrodes, electrochemical generators, etc., can solve problems such as microcracks and affect cycle performance, and achieve the effect of improving stability, improving cycle performance, and avoiding microcracks

Pending Publication Date: 2021-12-31
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect that there are many crystal defects in the crystal structure of the coated ternary precursor in the prior art, which lead to the generation of microcracks in the post-cycle process and affect the cycle performance, thereby providing a A kind of coated ternary precursor and its preparation method and positive electrode material containing it

Method used

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  • Coated ternary precursor, preparation method thereof and positive electrode material containing coated ternary precursor
  • Coated ternary precursor, preparation method thereof and positive electrode material containing coated ternary precursor
  • Coated ternary precursor, preparation method thereof and positive electrode material containing coated ternary precursor

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Embodiment 1

[0053] This embodiment provides a method for preparing a coated ternary precursor, including the following steps:

[0054] Step S1: Take the ternary precursor (molecular formula: Ni 0.62 mn 0.2 co 0.18 (OH) 2 ) into a 20wt% ammonia solution heated in a water bath, control the mass ratio of the water in the ammonia solution to the ternary precursor to 3:2, the temperature of the water bath is 35°C, stir for 30min at a speed of 300rpm, and the ternary precursor Dissolve evenly to obtain a precursor solution. Dissolve zirconium sulfate in ethanol, control the ratio of the mass of ethanol to the mass of ammonia water to be 1:1, the content of zirconium in zirconium sulfate accounts for 1000ppm of the mass of the ternary precursor, stir in a water bath at 40°C and 300rpm for 8h, and obtain the package Overlay.

[0055] Step S2: Add the coating liquid into the precursor solution, stir in a water bath at 50° C. and 300 rpm for 30 min to achieve full hydrolysis coating, and obtai...

Embodiment 2

[0062] This embodiment provides a method for preparing a coated ternary precursor, including the following steps:

[0063] Step S1: Take the ternary precursor (molecular formula: Ni 0.62 mn 0.2 co 0.18 (OH) 2 Put it into a 20wt% ammonia solution heated by a water bath, control the mass ratio of the water in the ammonia solution to the ternary precursor to 3:2, the temperature of the water bath is 35°C, stir for 30min at a speed of 300rpm, and the ternary precursor is uniform dissolved to obtain a precursor solution. Dissolve aluminum sulfate and titanium sulfate in ethanol, and control the ratio of the mass of ethanol to the mass of ammonia water to be 1:1. The content of aluminum in aluminum sulfate accounts for 1000ppm of the mass of the ternary precursor, and the content of titanium in titanium sulfate accounts for 1000ppm of the mass of the ternary precursor. The body mass was 1000 ppm, stirred in a water bath at 40° C. and 300 rpm for 8 hours to obtain a coating solut...

Embodiment 3

[0071] This embodiment provides a method for preparing a coated ternary precursor, including the following steps:

[0072] Step S1: Take the ternary precursor (molecular formula: Ni 0.85 mn 0.08 co 0.7 (OH) 2 Put it into the aqueous solution of ammonium bicarbonate heated in a water bath (the mass ratio of ammonium bicarbonate to water is 1:4), control the mass ratio of the mass of water to the ternary precursor to 8:1, and the temperature of the water bath is 55°C. Stirring at 800rpm for 60min, the ternary precursor was uniformly dissolved to obtain a precursor solution. Dissolve aluminum sulfate and titanium sulfate in ethanol, and control the ratio of the mass of ethanol to the mass of ammonia water to be 1:1. The content of aluminum in aluminum sulfate accounts for 20000ppm of the mass of the ternary precursor, and the content of titanium in titanium sulfate accounts for 20000ppm of the mass of the ternary precursor. 30,000 ppm by weight, stirred in a water bath at 50°...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a coated ternary precursor, a preparation method thereof and a positive electrode material comprising the coated ternary precursor, and the preparation method of the coated ternary precursor comprises the following steps: dissolving the ternary precursor in water in the presence of a solubilizer to obtain a precursor solution; dissolving a metal salt in an alcohol compound to obtain a coating solution; and mixing the coating solution and the precursor solution to realize wet hydrolysis coating, and then carrying out solid-liquid separation, water washing and vacuum drying to obtain a coated ternary precursor with the surface coated with metal hydroxide, so that the lattice defects and structure problems of the ternary precursor material are fundamentally improved, and the stability of the ternary precursor is greatly improved; and the occurrence of microcracks is avoided, and the obtained lithium battery has good cycle performance and relatively high specific discharge capacity.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a coated ternary precursor, a preparation method thereof, and a positive electrode material containing the same. Background technique [0002] As a new type of green power source, lithium-ion batteries have been widely used in electric vehicles, energy storage power stations and electric tools due to their high energy density, high voltage, large specific energy, long cycle life, green safety and environmental protection. . However, high-nickel layered oxide materials are considered to be one of the most competitive ternary cathode materials due to their high discharge capacity (200-220mAh / g), high energy density (>800Wh / Kg) and low cost. It has become a research hotspot in the field of cathode materials for lithium-ion batteries. [0003] However, due to the high content of nickel in the ternary cathode material, Li / Ni cations are prone to be mixed, resulting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/36H01M10/0525Y02E60/10
Inventor 任海朋崔军燕李嘉俊陈婷婷
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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