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Method for improving capacitance of lithium secondary battery

A lithium secondary battery and capacity technology, which is applied in secondary batteries, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems that the positive electrode material and conductive agent cannot be mixed uniformly, and the battery capacity is not high, so as to improve the overall capacity, The effect of increasing battery capacity and increasing content

Inactive Publication Date: 2008-03-05
湖北盐光能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, this mixing process cannot mix the positive electrode material and the conductive agent well, resulting in a low battery capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Mixing

[0040] Accurately weigh 20 grams of PVDF baked and cooled to 50°C in a blender, then weigh 300 grams of NMP and add it to the blender to dissolve PVDF, start the blender to dissolve it, it takes about 1 hour, and then pour it into the blender Add 100 grams of NMP, continue stirring to completely dissolve PVDF, then add 20.0 grams of Super P conductive agent, and stir for 1 hour to make it evenly mixed and set aside.

[0041] Accurately weigh 1,000 grams of lithium cobalt oxide cooled to below 50°C after baking and place it in a stirrer, then add 100 grams of NMP, start the stirrer and stir for about 1 hour to make it evenly wet. Then add the adhesive and conductive agent mixed in the above steps, stir for about 5 hours, measure its viscosity to 4500mpa.s, stir in vacuum for 20 minutes, then pass through a 150-mesh sieve, and discharge.

[0042] (2) coating

[0043] Apply the slurry prepared above evenly on the aluminum foil of the current collector accord...

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PUM

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Abstract

This invention discloses a method for increasing capacity of Li-secondary batteries including: mixing a solvent, adhesive, a positive active material and a conductive agent to prepare positive slurry in the following three steps: 1, putting part of the solvent into the adhesive and mixing them fully to dissolve them completely and then adding the conductive agent and mixing them fully, 2, putting the rest solvent into a positive active material to mix them fully and the positive active material is wet uniformly, 3, fully mixing the products got from step 1 and 2 fully, which increases dispersion degree of the conductive agent in the positive active material.

Description

technical field [0001] The invention relates to the field of lithium battery manufacturing, in particular to a method for increasing the capacity of lithium secondary batteries. Background technique [0002] Lithium-ion battery is a high-performance secondary battery, which has the advantages of high working voltage, high volume and weight energy density, long life, low self-discharge rate, no memory effect and good for the environment. It is widely used in mobile communication equipment, Notebook computers, camcorders, PDAs (personal digital assistants), digital cameras, power tools, torpedoes, missiles and other fields. [0003] In recent years, with the portable electronic devices becoming lighter, higher requirements have been placed on the driving power of the electronic devices, that is, lithium-ion batteries are required to store higher energy in a smaller space. In order to adapt to this trend, scientists from all over the world are making unremitting efforts. In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40H01M4/04H01M4/58H01M4/48H01M4/62H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 李龙任灿
Owner 湖北盐光能源科技有限公司
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