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Lithium ion battery and preparation method thereof

A lithium-ion battery and conductive carbon black technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve problems such as unstable effects and increased manufacturing costs, and achieve easy control, improved low-temperature performance, and simple manufacturing processes Effect

Inactive Publication Date: 2011-11-09
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of these methods is still unstable, and it also increases the manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Prepare a set of model 423048A aluminum case lithium-ion batteries, the specific preparation and performance testing steps are as follows.

[0013] 1) Production of positive electrode sheet. The positive electrode active material lithium cobaltate, the positive electrode conductive agent conductive carbon black SP, the positive electrode binder PVDF (model RC10214) and the solvent NMP were mixed and stirred evenly to prepare the positive electrode slurry. The positive electrode slurry was coated on both sides of a 16 μm thick positive electrode current collector aluminum foil, dried and rolled to form a positive electrode sheet.

[0014] 2) Negative sheet production. Mix the negative electrode active material natural graphite and the negative electrode conductive agent conductive carbon black SP, and then uniformly disperse in the configured sodium carboxymethylcellulose (CMC) aqueous solution, and add styrene-butadiene rubber (SBR) to it as a binder, After uniform st...

Embodiment 2

[0020] Prepare a group of model 423048A aluminum shell lithium-ion batteries, the specific preparation and performance test steps are different from Example 1 in that: Step 2) In the production of the negative electrode sheet, the compacted density of the negative electrode sheet is controlled to be 1.45g / cm 3 , other steps, formula are identical with embodiment 1. The charging and discharging test results are shown in Table 1.

Embodiment 3

[0022] Prepare a group of model 423048A aluminum shell lithium-ion batteries, the specific preparation and performance test steps are different from Example 1 in that: Step 2) In the production of the negative electrode sheet, the compacted density of the negative electrode sheet is controlled to be 1.35g / cm 3 , other steps, formula are identical with embodiment 1. The charging and discharging test results are shown in Table 1.

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PUM

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Abstract

The invention discloses a preparation method for a lithium ion battery. The method comprises preparation steps for a cathode sheet: uniformly mixing and stirring a cathode active material, a cathode agglomerant and a cathode solvent to prepare cathode slurry; coating the cathode slurry on a cathode current collector, followed by drying and rolling to prepare the cathode sheet. The cathode active material is natural graphite. A cathode conductive agent is added to the cathode slurry, wherein the cathode conductive agent is conductive carbon black. A compacted density of the rolled cathode sheet is 1.35-1.45 g / cm<3>. With the present invention, the conductive carbon black SP is added to the cathode system, the compacted density of the cathode sheet is reduced, such that electric conductivity of the cathode sheet at a low temperature is effectively raised, charge-discharge performance of the lithium ion battery at a low temperature is improved. In addition, the method provided by the present invention has advantages of simple process and easy control, and is easily applicable for industrial popularization and industrial application.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They are widely used in various electronic products such as mobile phones, mobile phones, cameras, and notebook computers. Moreover, lithium-ion batteries It is also an ideal choice for future electric vehicle energy. However, the operating temperature range of lithium-ion batteries is narrow, which has become a major obstacle to the development of lithium-ion batteries, especially in low-temperature environments (5-15°C), the battery charge and discharge performance drops significantly, limiting the use of lithium-ion batteries . In the prior art, in order to stabilize the performance of the lithium-ion battery under low temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/1393H01M4/133H01M10/0525
CPCY02E60/122Y02E60/12Y02E60/10Y02P70/50
Inventor 潘启明滕鑫肖斌何伟何名龙凤
Owner SHENZHEN BAK BATTERY CO LTD
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