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Composite lithium ion battery positive electrode material, preparation method thereof and lithium ion battery

A technology for lithium ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as structural damage, reduce gas generation, improve energy density and cycle performance, and reduce lithium carbonate content.

Active Publication Date: 2019-05-24
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 method for preparing a composite lithium ion battery cathode material, and the preparation method includes the following steps:

[0050] (1) The nickel source, the cobalt source and the manganese source are made into a mixed solution and then the precursor is prepared by the co-precipitation method. The lithium source and the precursor are sintered to obtain the core layer material, the median diameter D50 is 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, solid-liquid separation to obtain a white precipitate, prepare the white precipitate and deionized water into a suspension, stir at high speed And adding a 30% hydrogen peroxide solution slowly to the suspension under a water bath at 40°C until the suspension is clear, and continue to stir after the reaction until the hydrogen peroxide is completely decomposed ...

Embodiment 2

[0056] This embodiment provides a method for preparing a composite lithium ion battery cathode material, and the preparation method includes the following steps:

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

[0058] (2) Mix the titanium isopropoxide solution with 10% dilute ammonia water, keep the pH of the mixed solution at 7, solid-liquid separation to obtain a white precipitate, prepare the white precipitate and deionized water into a suspension, stir at high speed and Add a 30% hydrogen peroxide solution slowly to the suspension under a 40°C water bath until the suspension is clear, and continue to stir after the reaction until the hydrogen peroxide is completely decomposed t...

Embodiment 3

[0063] This embodiment provides a method for preparing a composite lithium ion battery cathode material, and the preparation method includes the following steps:

[0064] (1) The nickel source, the cobalt source and the manganese source are made into a mixed solution and then the precursor is prepared by the co-precipitation method. The lithium source and the precursor are sintered to obtain the inner core layer material, the median diameter D50 is 11 μm, and the Li The molar ratio of Ni:Co:Mn element 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, and obtain a white precipitate by solid-liquid separation. The white precipitate and deionized water are prepared into a suspension, and stirred at high speed and 40%. Add a 30% hydrogen peroxide solution slowly to the suspension under a water bath at °C until the suspension is clear, and continue stirring after the reaction until the hydrogen peroxide is ...

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Abstract

The invention provides a composite lithium ion battery positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material comprises a core layer and acoating layer. The general formula of the material of the core layer is LiNixCoyMnzO2, wherein x ranges from 0.5 to 0.9, y ranges from 0.05 to 0.2, and z ranges from 0.05 to 0.3. The general formulaof the material of the coating layer is Li2Mn0.5Ti0.5O2F. The positive electrode material can be applied to a high-capacity lithium ion battery, so that the energy density and the cycle performance ofthe lithium ion battery are improved.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery positive electrode material, in particular to a composite lithium ion battery positive electrode material and a preparation method thereof, and a lithium ion battery. Background technique [0002] As the popularity of electric vehicles continues to increase, higher requirements are placed on the energy density and safety of power-type lithium-ion batteries. According to the goals proposed in the National Energy Conservation and New Energy Automobile Industry Development Plan, the energy density of power-type lithium-ion batteries should reach 300Wh / kg by 2020, and the key to solving the energy density of power-type lithium-ion batteries lies in the breakthrough of battery materials. Especially the breakthrough of cathode materials. [0003] At present, most power batteries at home and abroad use ternary cathode materials. Different ratios of NCM materials have d...

Claims

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Application Information

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Patent Type & Authority Applications(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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