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Preparation method of high-rate battery

A high-rate, high-power battery technology, applied in the manufacture of electrolyte batteries, lithium batteries, secondary batteries, etc., can solve problems such as voltage, and achieve the effects of simple preparation conditions, superior performance, and low production conditions

Active Publication Date: 2021-03-09
湖南美尼科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of high rate discharge or low temperature discharge, there will still be a phenomenon of voltage groove

Method used

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  • Preparation method of high-rate battery

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preparation example Construction

[0038] Such as Figure 1-7 As shown, the specific embodiment of the present invention is a method for preparing a high-rate battery, and the specific manufacturing steps are as follows:

[0039] The first step is to prepare positive electrode slurry: weigh 90-95% positive electrode conductive material, 1.0-2.5% positive electrode binder, 1.5-4.5% positive electrode conductive agent, 0.1-3% pore regulator according to mass percentage, and weigh the above After the raw materials are added, an auxiliary solvent is added, and the mixture is mixed by a vacuum mixer to obtain a positive electrode slurry. The positive electrode binder is mainly homopolymerized or copolymerized PVDF through suspension polymerization and emulsion polymerization, and PTFE. The auxiliary solvent for the positive electrode is NMP or DMAC, etc., wherein NMP is N-methylpyrrolidone.

[0040] The second step is to prepare negative electrode slurry: weigh 90-96% negative electrode conductive material, 0.5-2....

Embodiment 1

[0060] The ratio of the number of parts of the positive electrode formula is: LCO:PVDF:SP:aluminum chloride=96:2:2:0.5

[0061] The proportion ratio of the negative electrode formula is: artificial graphite: SP: CMC: SBR: aluminum chloride = 95:1.5:1.5:2:0.5

[0062] (Because the pore regulator aluminum chloride will be removed in subsequent operations, this embodiment is calculated based on 100 parts of other substances in the positive and negative electrode formulations)

[0063] The slurry is prepared according to the well-known positive and negative electrode slurry preparation methods in the industry. Aluminum chloride can be dry-mixed with positive and negative electrode active materials, and can also be mixed with positive and negative electrode glue to make pulp. After the performance of the slurry meets the discharge conditions, it is demagnetized and pumped to the coating head for coating. The temperature of the positive electrode coating drying zone is between 60-1...

Embodiment 2

[0069] The ratio of the number of parts of the positive electrode formula is: NMC:PVDF:SP=94:2:4;

[0070] The proportion ratio of the negative electrode formula is: artificial graphite: SP: CMC: SBR: aluminum chloride = 93:3.5:1.5:2:0.5; (considering that the pore regulator aluminum chloride will be removed in subsequent operations, so this The embodiment is designed according to 100 parts of other substances of the positive and negative electrode formulations.)

[0071] The slurry is prepared according to the well-known positive and negative electrode slurry preparation methods in the industry. Aluminum chloride can be dry-mixed with the negative electrode active material, or can be mixed with the negative electrode glue and then made into pulp. After the slurry performance meets the discharge conditions, it will be demagnetized and pumped to the coating head for coating. The temperature of the positive electrode coating drying zone is between 60-120°C, and the negative ele...

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Abstract

The invention discloses a preparation method of a high-rate battery, which comprises the following steps: preparing positive electrode slurry, namely weighing a positive electrode conductive material,a positive electrode binder, a positive electrode conductive agent and a pore regulator in proportion, adding an auxiliary solvent, and mixing by a vacuum mixer to obtain the positive electrode slurry; preparing negative electrode slurry, namely weighing a negative electrode conductive material, a negative electrode conductive agent, a thickening agent, a negative electrode binder and a pore regulator in proportion, adding an auxiliary solvent, and mixing by virtue of a vacuum stirrer, so as to obtain the negative electrode slurry; preparing an electrolyte, namely weighing lithium salt, a solvent and an additive in proportion; and manufacturing a battery cell, namely preparing the lithium battery cell according to a specified design process flow; The preparation method has the advantagesof simple preparation conditions, no need of an ultrahigh temperature environment, low requirements on production conditions, and low production cost; and meanwhile, the lithium battery cell with thegap is prepared, the high-rate charging and discharging performance is excellent, and the high retention rate can be maintained during high-rate charging and discharging.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for preparing a high-rate battery. Background technique [0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and uses a non-aqueous electrolyte solution. In 1912, the lithium metal battery was first proposed and studied by Gilbert N. Lewis. In the 1970s, M.S.Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become the mainstream. [0003] Among them, the improvement of rate performance is a relatively common topic in the development of batteries. Conventional methods can be roughly divided into selecting rate-type positive and negative electrode materials, ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0587H01M10/052H01M10/0525
CPCH01M10/058H01M10/0587H01M10/052H01M10/0525Y02E60/10Y02P70/50
Inventor 卢灿生陈邦义
Owner 湖南美尼科技有限公司
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