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Cobalt-free lithium-rich manganese-based positive electrode material, composite positive electrode sheet and lithium ion battery

A technology for cobalt, lithium-rich manganese-based, and lithium-ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., and can solve the problems of low stability of lithium-rich manganese-based cathode materials, no commercial application value, and rapid voltage decay. , to achieve the effects of good cycle stability, slow voltage decay and high first efficiency

Active Publication Date: 2020-08-28
FARASIS TECH (GANZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lithium-rich manganese-based cathode materials based on ternary materials have attracted more and more attention due to their low price, environmental friendliness, and higher specific capacity than ternary materials, but the stability of reported lithium-rich manganese-based cathode materials Low, poor cycle, hindering its further application
The lithium-rich manganese-based lithium-ion batteries prepared in the prior art have low first effect, fast voltage decay, poor cycle performance, and no commercial application value.

Method used

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  • Cobalt-free lithium-rich manganese-based positive electrode material, composite positive electrode sheet and lithium ion battery
  • Cobalt-free lithium-rich manganese-based positive electrode material, composite positive electrode sheet and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The preparation of the composite positive pole piece comprises the steps:

[0061] (1) Weigh 0.32kg of conductive carbon black, 0.34kg of polyvinylidene fluoride and 0.01kg of dispersant into a high-speed disperser, the dispersion speed is 2000rpm, and the dispersion time is 1.5h;

[0062] (2) Continue to add 6.72kg of N-methyl-2-pyrrolidone, then add 4.95kg of cobalt-free lithium-rich manganese-based active material, the dispersion speed is 3500rpm, the dispersion time is 3.5h, and the slurry is uniformly mixed;

[0063] (3) Continue to add 4.9kg of cobalt-free lithium-rich manganese-based active materials and 0.2kg of N-methyl-2-pyrrolidone into the high-speed disperser, adjust the dispersion speed to 3500rpm, and the dispersion time to 2.5h to obtain a composite positive electrode slurry;

[0064] (4) Pump the above-mentioned composite positive electrode slurry to the coating machine through the pipeline, adjust the setting parameters to the specified thickness and c...

Embodiment 2

[0072] The preparation of the composite positive pole piece comprises the steps:

[0073] (1) Weigh 0.3kg of conductive carbon black, 0.2kg of polyvinylidene fluoride and 0.1kg of dispersant into a high-speed disperser, the dispersion speed is 2000rpm, and the dispersion time is 1.5h;

[0074] (2) Continue to add 6.72kg of N-methyl-2-pyrrolidone, then add 4.7kg of cobalt-free lithium-rich manganese-based active material, the dispersion speed is 3500rpm, the dispersion time is 3.5h, and the slurry is uniformly mixed;

[0075] (3) Continue to add 4.7kg of cobalt-free lithium-rich manganese-based active materials and 0.2kg of N-methyl-2-pyrrolidone into the high-speed disperser, adjust the dispersion speed to 3500rpm, and the dispersion time to 2.5h to obtain a composite positive electrode slurry;

[0076] (4) Pump the above-mentioned composite positive electrode slurry to the coating machine through the pipeline, adjust the setting parameters to the specified thickness and coat ...

Embodiment 3

[0084] The preparation of composite positive electrode sheet comprises the steps:

[0085] (1) Weigh 0.4kg of conductive carbon black, 0.35kg of polyvinylidene fluoride and 0.1kg of dispersant into a high-speed disperser, the dispersion speed is 2000rpm, and the dispersion time is 1.5h;

[0086] (2) Continue to add 6.72kg of N-methyl-2-pyrrolidone, then add 4.85kg of cobalt-free lithium-rich manganese-based active material, the dispersion speed is 3500rpm, the dispersion time is 3.5h, and the slurry is uniformly mixed;

[0087] (3) Continue to add 4.8 kg of cobalt-free lithium-rich manganese-based active materials and 0.2 kg of N-methyl-2-pyrrolidone into the high-speed disperser, adjust the dispersion speed to 3500 rpm, and the dispersion time to 2.5 hours to obtain a composite positive electrode slurry;

[0088] (4) Pump the above-mentioned composite positive electrode slurry to the coating machine through the pipeline, adjust the setting parameters to the specified thicknes...

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Abstract

The invention relates to the technical field of lithium batteries, and discloses a cobalt-free lithium-rich manganese-based positive electrode material, a composite positive electrode sheet and a lithium ion battery, wherein the chemical formula of the cobalt-free lithium-rich manganese-based positive electrode material is xLi2MnO3.(1-x)LiMeO2+a, x is greater than 0 and less than 1, a is greater than or equal to 0 and less than 1, and Me is selected from more than one of Mn, Ni, Al, Mg, Ti, B, F, Y and La. When the cobalt-free lithium-rich manganese-based positive electrode material is used for preparing a lithium ion battery, the preparation process is simple, the energy consumption is low, the cost is low, the industrialization is easy, and the prepared battery has the advantages of highfirst effect, good rate capability, slow voltage attenuation in the cycle process and good cycle stability, and has commercial application value.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a cobalt-free lithium-rich manganese-based positive electrode material, a composite positive electrode sheet and a lithium ion battery. Background technique [0002] Lithium-ion batteries have attracted extensive attention due to their high energy density, long cycle life, and environmental friendliness. In the past 30 years, it has been widely used in portable electronic products such as mobile phones, digital cameras, and notebook computers. With the continuous development of modern society, the requirements for the battery life of electronics and other heavy equipment (such as electric vehicles, aircraft) are also continuously improved. This puts forward higher requirements on the energy density of lithium-ion batteries, and the cathode material, which is an important part of lithium-ion batteries, has always been one of the bottlenecks. [0003] At present, the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/58H01M10/0525
CPCH01M4/485H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor P·廖钱柳李红生
Owner FARASIS TECH (GANZHOU) CO LTD
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