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Power energy storage polymer lithium ion battery and preparation method thereof

A lithium-ion battery and power energy storage technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., to achieve the effects of reducing production costs, improving electrical conductivity, and increasing rate performance

Active Publication Date: 2014-06-25
江西格林德能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the preparation technology and process of the existing power energy storage polymer lithium-ion battery still need to be further improved and developed.

Method used

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  • Power energy storage polymer lithium ion battery and preparation method thereof
  • Power energy storage polymer lithium ion battery and preparation method thereof
  • Power energy storage polymer lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Depend on figure 1 with figure 2 As shown in: the battery produced by the method of the present invention includes a cell main body 1, a positive pole tab 2, a negative pole tab 3, a positive pole tab 4 with a sealant, a negative pole tab 5 with a sealant, and a positive pole tab Sealant 6 and negative electrode lug sealant 7. The positive electrode sheet and the negative electrode sheet are respectively made of a molecular-level ultrafine dispersed positive and negative electrode slurry; the battery is composed of two electric cores connected in parallel; each of the two electric cores contains a bipolar ear And the inside of the double-pole ear double-core is a parallel winding structure. The internal parallel winding structure of double-pole tabs and double-cores can reduce the internal resistance of the battery, improve the battery rate performance, and have high production efficiency and reduce the production cost of the battery.

[0044] In this embodiment, th...

Embodiment 2

[0067] The preparation of the power energy storage polymer lithium-ion battery in this embodiment specifically includes the following steps:

[0068] A. Preparation of positive electrode slurry and positive electrode sheet:

[0069] ① Raw materials are prepared in the following proportions by weight:

[0070] Polyvinylidene fluoride (PVDF): 3.0kg, nanocomposite conductive agent: 2.0kg, positive electrode material nickel cobalt lithium manganate Li(Ni x co y mn 1-x-y )O 2 : 5.0kg, positive electrode material lithium iron phosphate: 85.0kg.

[0071] Add 3.0kg of lithium battery binder polyvinylidene fluoride to 30Wt% solvent N-methylpyrrolidone (NMP) in the mixer, heat up and keep the solvent temperature at 60±5°C, and rotate at 2000 rpm in the mixer , the revolution speed is 45 revolutions / min, and the vacuum high-temperature stirring is carried out to obtain the first-stage binder slurry of 2000-3500Mpa s;

[0072] ② Add 2.0kg of nanocomposite conductive agent and 5.0kg ...

Embodiment 3

[0086] The preparation of the power energy storage polymer lithium-ion battery in this embodiment specifically includes the following steps:

[0087] 1. Preparation of positive electrode slurry and positive electrode sheet:

[0088] ① Raw materials are prepared in the following proportions by weight:

[0089] Polyvinylidene fluoride (PVDF): 5.0kg, nanocomposite conductive agent: 4.5kg, positive electrode material nickel cobalt lithium manganate Li(Ni x co y mn 1-x-y )O 2 : 3.0kg, positive electrode material lithium iron phosphate: 92.0kg.

[0090] Add 5.0kg of binder polyvinylidene fluoride to 15Wt% solvent N-methylpyrrolidone (NMP) in the mixer, heat up and keep the solvent temperature at 60±5°C, and rotate at 1500 revolutions / min in the mixer, revolution Vacuum high-temperature stirring at a speed of 30 rpm to obtain a first-stage binder slurry of 2000-3500Mpa s;

[0091] ②Add 4.5kg of nanocomposite conductive agent and 3.0kg of positive electrode material nickel-cobal...

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Abstract

The invention discloses a power energy storage polymer lithium ion battery. The power energy storage polymer lithium ion battery comprises a positive plate, an isolating membrane, a negative plate, electrolyte, tabs and an aluminum plastic film. The battery is formed by connecting two battery cells in parallel; the two battery cells contain double tabs, and interiors of double cores of the double tabs are connected in parallel to form a winding structure. High-viscosity molecular-scale superfine disperse lithium ion battery anode and cathode paste is prepared through three-time high-speed stirring; the anode paste comprises the following main components: polyvinylidene fluoride, a nano composite conductive agent, an anode material nickel cobalt lithium manganate and an anode material lithium iron phosphate; the cathode paste comprises the following main components: sodium carboxymethylcellulose, styrene butadiene rubber, a nano composite conductive agent and synthetic graphite. The battery is high in rate performance and has good cycle performance and low-temperature performance; by adoption of the parallel winding structure inside the double cores of the double tabs, the internal resistance of the battery can be reduced, the battery has extremely high production efficiency, and the production cost of the battery is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a preparation method of a power energy storage polymer lithium ion battery. Background technique [0002] Power energy storage polymer lithium-ion batteries have the advantages of high energy density, high voltage, high power, light weight, long cycle life, wide working range, good safety, and no memory effect. Bicycles, electric tools, power supply systems for national defense and military equipment, photovoltaic energy storage systems, energy storage peak-shifting power stations, uninterruptible power supplies, and small and medium-sized energy storage systems have broad application prospects. [0003] At present, the general power energy storage polymer lithium-ion battery mainly has three structures: (1) Lamination form, where multiple positive plates, separators, and negative plates are stacked together alternately to form a battery cell...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058H01M4/1391
CPCH01M4/1391H01M10/0525H01M10/0587H01M50/538Y02E60/10Y02P70/50
Inventor 李国敏刘小虹余兰李露骆文平李德义王敏郑小聪黄小
Owner 江西格林德能源有限公司
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