Lithium-rich ternary composite material and preparation method thereof

A technology of composite materials and ternary materials, which is applied in the field of lithium-rich ternary composite materials and their preparation, can solve the problems of ternary material energy density and cycle performance that cannot meet high specific energy density, and achieve improved transmission rate and rate performance , reduce the probability of lithium precipitation, improve the effect of rate performance and safety performance

Inactive Publication Date: 2017-05-24
江苏元景锂粉工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the fact that the energy density and cycle performance of current ternary materials cannot meet the market demand for high specific energy density

Method used

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  • Lithium-rich ternary composite material and preparation method thereof
  • Lithium-rich ternary composite material and preparation method thereof
  • Lithium-rich ternary composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) First, weigh 95g of high-molecular polymer polypropylene carbonate and dissolve it in 500ml of carbon tetrachloride, then add 5g of lithium powder (particle size 0.2μm), and stir evenly to obtain lithium powder-coated colloid A; At the same time, weigh 30g of polyvinylidene fluoride and add it to 500ml of N-methylpyrrolidone, dissolve evenly and then add 40g of graphene to disperse evenly at high speed, then add 30g of lithium metaaluminate and disperse evenly to obtain metaaluminate Lithium mixture B;

[0021] 2) Then weigh 120g of LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary material (manufacturer: Henan Kelong New Energy Co., Ltd., model: KL206) is added to colloid A, stirred evenly, filtered, and vacuum dried at 80°C to obtain a ternary material / lithium powder complex, and then added to lithium metaaluminate In the mixed liquid B, stir evenly, filter, heat up to 150°C at a heating rate of 3°C / min, keep it warm for 2 hours, and naturally cool down to room temperature to...

Embodiment 2

[0023] 1) First weigh 90g of polymer polymethylsiloxane and dissolve it in 500ml of carbon tetrachloride, then add 10g of lithium powder (particle size is 0.1μm), and stir evenly to obtain lithium powder coated colloid A; At the same time, weigh 20g of polyvinylidene fluoride and add it to 500ml of N-methylpyrrolidone, dissolve evenly and then add 40g of graphene to disperse evenly at high speed, then add 40g of lithium metaaluminate and disperse evenly to obtain partial Lithium aluminate mixed solution B;

[0024] 2) Then weigh 100g of LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary material (manufacturer: Henan Kelong New Energy Co., Ltd., model: KL206) is added to colloid A, stirred evenly, filtered, and vacuum dried at 80°C to obtain a ternary material / lithium powder complex, and then added to lithium metaaluminate In the mixed solution B, stir evenly, filter, heat up to 180°C at a heating rate of 1°C / min, keep it warm for 3 hours, and cool down to room temperature naturally to obt...

Embodiment 3

[0026] 1) First weigh 99g of polymethyl acrylate polymer and dissolve it in 500ml of carbon tetrachloride, then add 1g of lithium powder (with a particle size of 0.5μm), and stir evenly to obtain lithium powder-coated colloid A; At the same time, weigh 40g of polyvinylidene fluoride and add it to 500ml of N-methylpyrrolidone, dissolve evenly and then add 30g of graphene to disperse evenly at high speed, then add 30g of lithium metaaluminate and disperse evenly to obtain metaaluminate Lithium mixture B;

[0027] 2) Then weigh 150g of LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary material (manufacturer: Henan Kelong New Energy Co., Ltd., model: KL206) is added to colloid A, stirred evenly, filtered, and vacuum dried at 80°C to obtain a ternary material / lithium powder complex, and then added to lithium metaaluminate In the mixed solution B, stir evenly, filter, raise the temperature to 180°C at a heating rate of 5°C / min, keep it warm for 1h, and naturally cool down to room temperature t...

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Abstract

The invention belongs to the field of lithium ion battery material preparation, and particularly relates to a lithium-rich ternary composite material and a preparation method thereof. The preparation method comprises the steps of firstly preparing lithium powder externally coated with a polymer, then adding the lithium powder into a ternary material, uniformly mixing the lithium powder and the ternary material, soaking in a lithium metaaluminate solution, and drying to prepare the ternary composite material with a core-shell structure. The prepared material utilizes the lithium powder coated with the ternary material for providing sufficient lithium ions during a charge-discharge process, so that the first-time efficiency and the rate capability thereof are improved; meanwhile, the lithium-ion transmission rate under the high-rate condition is improved by depending on the lithium ions in the lithium metaaluminate solution on the outermost layer; meanwhile, an outer shell layer has better compatibility with an electrolyte solution, so that the cycle performance is improved.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery materials, in particular to a lithium-rich ternary composite material and a preparation method thereof. Background technique [0002] Ternary materials are widely used in lithium-ion batteries due to their high gram capacity, simple processing technology, good rate performance and excellent low-temperature performance, and are also used in electric vehicles, digital products and other fields. However, as the market increases the energy density of lithium-ion batteries, ternary materials are required to have a higher gram capacity and a higher discharge voltage platform. Currently, the ternary materials on the market are mainly NCM and NCA. The content of nickel in the element material can increase the gram capacity of the material, but because the nickel material is extremely easy to absorb water, it is difficult to process and the cycle performance is deviated, which affects the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 黄国林王建琴
Owner 江苏元景锂粉工业有限公司
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