A high-capacity secure 26650 lithium ion battery and its making method

A technology of lithium-ion batteries and manufacturing methods, which is applied in the directions of battery electrodes, secondary batteries, battery pack components, etc., and can solve problems such as limitations

Inactive Publication Date: 2008-09-10
上海德朗能电池有限公司
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a high-capacity and safe 26650 lithium-ion battery and its manufacturing method, which mainly solves the limitations of existing lithium-ion batteries in terms of safety and large-scale, and develops towards large-scale, with longer life and more High safety performance, more widely used environmentally friendly chemical power supply

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  • A high-capacity secure 26650 lithium ion battery and its making method
  • A high-capacity secure 26650 lithium ion battery and its making method
  • A high-capacity secure 26650 lithium ion battery and its making method

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Embodiment Construction

[0048] The present invention provides a high-capacity safe 26650 lithium-ion battery and the detailed steps of its manufacturing method are as follows:

[0049] 1. Make positive electrode solution (slurry)

[0050] First, mix PVDF and NMP to form an 8% solution, use a high-speed disperser to mix, use a revolution speed of 35 rpm, and rotate at a speed of 1500 rpm for 1 hour, add conductive carbon materials to increase the rotation speed Stir at 2000 rpm for 1 hour; add lithium iron phosphate powder, and stir at a speed above 2000 rpm for 3 hours, then add solvent NMP to adjust the viscosity of the solution; the ratio of the final solution is as follows: lithium iron phosphate: conductive carbon: PVDF: NMP = 100: 1: 3: 70, adjusted according to the characteristics of the equipment used, the positive electrode solution is configured, the viscosity is tested with a rotational viscometer, the viscosity is 13000mPaS, the particle size is measured with a particle size analyzer, the ...

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Abstract

The invention relates to the technical field of a secondary power (a chargeable battery) which can be reused, in particular to a 26650 type lithium ion battery which is safe and has high capacity and a preparation method thereof. Lithium ferrous phosphate is used as cathode material; graphite materials are adopted as anode materials; mixture of EC (ethylene carbonate), DMC (Di Methyl Carbonate), EMC (methyl ethyl carbonate) (based on volume ratio of 1: 1: 1) is used as electrolyte solution, and LiPF6 (lithium hexafluorophosphate ) with molar ration 1.0 to 1.4 mol/L is adopted as electrolyte; multi-porous PP (polypropylene) and PE (polyethylene) are used as separating membrane, and a metal tank is used as a shell, thus the 26650 type battery is made with the diameter of 26mm and the height of 65mm; the capacity of the battery can reach 3200mAh, the internal resistance is within 30mOmega, and the cycle life thereof is more than 1000 times. The 26650 type lithium ion battery mainly solves the limitation problem of the existing lithium ion battery in the respect of safe and large size, and develops towards large size, has longer service life and higher safety and belongs to an environment protection chemical power with wider application.

Description

Technical field: [0001] The invention relates to the technical field of reusable secondary power sources (rechargeable batteries), in particular to a high-capacity and safe 26650 lithium-ion battery and a manufacturing method thereof. Background technique: [0002] Lithium-ion batteries were developed and commercialized by Sony Corporation of Japan in the 1990s. Its appearance was a leap in the history of secondary battery development. Lithium-ion batteries have developed rapidly due to their light weight, high capacity, high working voltage, long service life and no pollution. Its global sales have exceeded the sum of nickel-metal hydride and nickel-cadmium batteries. In recent years, my country has made great progress in the industrialization of lithium-ion batteries. In 2003, the total output has exceeded 250 million. In 2005, it reached the production scale of 600 million. It is catching up with and surpassing the world's advanced level. [0003] In the past, electric b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/58H01M2/16H01M2/02H01M10/38H01M50/119H01M50/414
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 吴江峰陈瑶高鹏坤
Owner 上海德朗能电池有限公司
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