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A composite lithium-ion battery positive electrode material and its preparation method and a lithium-ion battery

A positive electrode material and ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as structural damage, achieve the effects of reducing gas generation, improving energy density and cycle performance, and reducing lithium carbonate content

Active Publication Date: 2022-05-20
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiMn 2 o 4 Mn at the end of discharge exists in the electrolyte 3+ Disproportionation and dissolution reaction, at the same time, a first-order phase transition from cubic to tetragonal will occur, destroying the structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment provides a preparation method of a composite lithium-ion battery cathode material, the preparation method comprising the following steps:

[0050] (1) The nickel source, cobalt source and manganese source are made into a mixed solution, and then the precursor is prepared by co-precipitation method, and the lithium source and the precursor are sintered to obtain the core layer material, with a median particle size D50 of 7 μm, where Li : The molar ratio of Ni:Co:Mn elements is 1.1:5:2:3;

[0051] (2) Mix the tetrabutyl titanate solution with 5% dilute ammonia water, keep the pH of the mixed solution at 7, separate the solid and liquid to obtain a white precipitate, configure the white precipitate and deionized water into a suspension, and stir at a high speed And slowly add 30% hydrogen peroxide solution to the suspension in a water bath at 40°C until the suspension is clear, and continue stirring after the reaction until the hydrogen peroxide is complete...

Embodiment 2

[0056] This embodiment provides a preparation method of a composite lithium-ion battery cathode material, the preparation method comprising the following steps:

[0057] (1) The nickel source, cobalt source and manganese source are made into a mixed solution, and then the precursor is prepared by co-precipitation method, and the lithium source is sintered with the precursor to obtain the core layer material, with a median particle size D50 of 9 μm, where Li : The molar ratio of Ni:Co:Mn elements is 1.1:6:2:2;

[0058] (2) Mix titanium isopropoxide solution with 10% dilute ammonia water, keep the pH of the mixed solution at 7, separate the solid and liquid to obtain a white precipitate, configure the white precipitate and deionized water into a suspension, stir at high speed and Slowly add 30% hydrogen peroxide solution to the suspension in a water bath at 40°C until the suspension is clear, and continue stirring after the reaction until the hydrogen peroxide is completely deco...

Embodiment 3

[0063] This embodiment provides a preparation method of a composite lithium-ion battery cathode material, the preparation method comprising the following steps:

[0064] (1) The nickel source, cobalt source and manganese source are made into a mixed solution, and then the precursor is prepared by co-precipitation method, and the lithium source and the precursor are sintered to obtain the core layer material, with a median particle size D50 of 11 μm, where Li : The molar ratio of Ni:Co:Mn is 1.2:8:1:1;

[0065](2) Mix the titanyl sulfate solution with 15% dilute ammonia water, keep the pH of the mixed solution at 7, separate the solid and liquid to obtain a white precipitate, configure the white precipitate and deionized water into a suspension, stir at high speed and 40 Slowly add 30% hydrogen peroxide solution to the suspension in a water bath at ℃ until the suspension is clear, and continue stirring after the reaction until the hydrogen peroxide is completely decomposed to o...

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Abstract

The invention provides a composite lithium-ion battery positive electrode material and a preparation method thereof and a lithium-ion battery. The positive electrode material includes an inner core layer and a cladding layer, and the general formula of the material of the inner core layer is LiNi x co y mn z o 2 , wherein x is 0.5 to 0.9, y is 0.05 to 0.2, z is 0.05 to 0.3, and the general formula of the cladding layer material is Li 2 mn 0.5 Ti 0.5 o 2 F. The positive electrode material can be applied to large-capacity lithium-ion batteries, so that the energy density and cycle performance of the lithium-ion batteries are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery cathode material, in particular to a composite lithium ion battery cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] With the increasing popularity of electric vehicles, there are higher requirements for the energy density and safety of power lithium-ion batteries. According to the goal proposed in the national energy-saving and new energy vehicle industry development plan, the energy density of power lithium-ion batteries should reach 300Wh / kg in 2020, and the key to solving the energy density of power lithium-ion batteries lies in the breakthrough of battery materials. Especially breakthroughs in cathode materials. [0003] At present, most power batteries at home and abroad use ternary cathode materials. Different proportions of NCM materials have different advantages and can be selected according t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 谭强强周运成
Owner LANGFANG GREEN IND TECH CENT
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