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Lithium ion battery pole piece with high multiplying power and production thereof

A lithium-ion battery, high-rate technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of small improvement space and restrict the high-rate and high-current discharge performance of polymer lithium-ion batteries, and achieve ultra-thin thickness. , The effect of coating uniformity is good

Active Publication Date: 2006-08-16
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The thickness of the pole pieces of conventional polymer lithium-ion batteries is 150-200 μm. The material, thickness and manufacturing process of the pole pieces restrict the insertion and extraction speed of lithium ions, which greatly restricts the high-rate and high-current discharge of polymer lithium-ion batteries. performance
The thickness of conventional pole pieces is limited by the physical and chemical properties and coating methods of traditional positive and negative electrode materials. Therefore, on the basis of traditional materials and processes, there is room for improvement in the discharge time of high-rate and high-current polymer lithium-ion batteries. very small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 80g of polyvinylidene fluoride to 900g of N-methylpyrrolidone and stir to make it fully dissolve, take 900g of lithium cobaltate, 10g of conductive graphite, and 10g of conductive carbon black into the above solution, place it in a high-speed mixer at 2000 rpm Minute speed stirring until the viscosity of the mixture reaches 8000Pa.s. The slurry was uniformly coated on a 20 μm aluminum foil with a coating thickness of 90 μm using a cast coater. Dry it in a vacuum oven at 100° C. for 8 hours, and then roll press it on a roll press to obtain a positive electrode sheet with a thickness of 50 μm.

[0021] Add 50g of polyvinylidene fluoride to 800g of N-methylpyrrolidone and stir to make it fully dissolve, then add 850g of artificial graphite and 10g of conductive carbon black to the above solution, place it in a high-speed mixer and stir at a speed of 2000 rpm Until the viscosity of the mixture reaches 6000Pa.s. The slurry was uniformly coated on a 20 μm copper foil wi...

Embodiment 2

[0023] Add 80g of polyvinylidene fluoride to 1100g of N-methylpyrrolidone and stir to make it fully dissolve, take 900g of lithium manganate, 10g of conductive graphite, and 10g of conductive carbon black into the above solution, place it in a high-speed mixer at 2000 rpm Minute speed stirring until the viscosity of the mixture reaches 8000Pa.s. The slurry was evenly coated on a 25 μm aluminum foil with a coating thickness of 100 μm using a cast coater. Dry it in a vacuum oven at 100° C. for 8 hours, and then roll press it on a roll press to obtain a positive electrode sheet with a thickness of 60 μm.

[0024] Add 50g of polyvinylidene fluoride to 1000g of N-methylpyrrolidone and stir to fully dissolve it, then add 930g of artificial graphite and 20g of carbon nanotubes into the above solution, and stir in a high-speed mixer at a speed of 4000 rpm 30min, then stir at a speed of 2000 rpm until the viscosity of the mixture reaches 5000Pa.s. The slurry was uniformly coated on a...

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PUM

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Abstract

The cell pole piece includes electrode active substance, collector, adhesive and conducting agent. The thickness of said pole piece is 40~100mum. The active substance of anode is selected from one of LiCoO2and LiMnO2 or the mixture of the both. The active substance of cathode is electrographite with grain size D50 distributed between 5~11mum. The said adhesive is polyvinylidene fluoride or Teflon. The conducting agent is selected from one of conducing carbon black, super-conduct carbon black, conductance graphite, acetylene black and carbon nano tube, or mixture of two of them above, or the mixture of more than two of them above. The weight percentage of electrode active substance, adhesive and conducting agent are 85~96%, 2~8%, 1~10% respectively.

Description

technical field [0001] The invention relates to a lithium-ion battery and a preparation method thereof, and in particular discloses a pole piece of a high-rate polymer lithium-ion battery and a preparation method thereof. Background technique [0002] As a new type of green energy developed in the early 1990s, polymer lithium-ion batteries have the characteristics of high energy density, high average output voltage, small self-discharge, excellent cycle performance, and good safety. demand, so it has achieved rapid development in just a dozen years. But at the same time, it is also exposed in the application that the specific power of the polymer lithium-ion battery is low, and its high-rate discharge performance is poor. In order to solve this problem, various research institutions have done a lot of materials and processes in lithium-ion batteries. Work. Among them, the research on the pole piece production technology is one of the key poi...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/64H01M4/48H01M4/58H01M4/62H01M4/04H01M10/40
CPCY02E60/122Y02E60/10
Inventor 黄睿杨小飞田波义张小聪王路杨兰生
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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