Pole piece of lithium ion cell and method to manufacture cell

A lithium-ion battery and pole piece technology, which is applied in the field of lithium-ion battery pole piece and the preparation of the lithium-ion battery, can solve the problems of battery cycle performance, uneven distribution of battery capacity, unstable product quality, etc. Achieve the effect of stable cycle performance, narrow distribution range and extended service life

Active Publication Date: 2007-05-16
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although according to the needs of different types of batteries, the required thickness of the pole piece within the requirements of the process standard can be obtained by controlling the pressure, but after the above-mentioned pole piec

Method used

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  • Pole piece of lithium ion cell and method to manufacture cell

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Example Embodiment

[0012] According to the preparation method of the lithium ion battery provided by the present invention, preferably, the dried current collector containing the positive electrode active material, the conductive agent and the positive electrode binder and the current collector containing the negative electrode active material and the negative electrode binder Both are calendered. The calendering includes passing the pole piece through the gap between the two rollers of the calender, and applying pressure on the pole piece through the rollers, wherein the two rollers of the calender are adjusted before the pressure is applied. The roller gap of the wheel is 1 / 2(D 2 +D 1 )2 +9D 1 ), preferably 1 / 3(D 2 +2D 1 )≤X≤1 / 7(D 2 +6D1); where X is the roller gap between the two rollers of the calender, D 1 Is the thickness of the front pole piece from the gap between the two rollers of the calender, D 2 It is the thickness of the back pole piece through the gap between the two rollers of the ca...

Example Embodiment

[0031] Example 1

[0032] This embodiment is used to illustrate the preparation of the lithium ion secondary battery provided by the present invention.

[0033] (1) Preparation of positive electrode

[0034] 100g of LiCoO 2 , 3 grams of binder polyvinylidene fluoride, 3 grams of conductive agent acetylene black are added to 50 grams of N-methylpyrrolidone, and then stirred in a mixer to form a uniform positive electrode slurry.

[0035] The slurry was uniformly coated on both sides on an aluminum foil with a thickness of 16 microns, dried at 150° C., and cut to obtain a positive electrode piece with a size of 340×41.5×0.205 mm. After that, the pole piece was calendered on a calender. Before calendering, the roller gap X between the two rollers was adjusted to make X=0.196 mm. After calendering, a positive pole piece with a thickness of 0.145 mm was obtained. It contains 5.8 grams of active ingredient LiCoO 2 .

[0036] (2) Preparation of negative electrode

[0037] Add 100 grams o...

Example Embodiment

[0041] Example 2-5

[0042] This embodiment is used to illustrate the preparation of the lithium ion secondary battery provided by the present invention.

[0043] Prepare battery pole pieces and batteries according to the method of Example 1. The difference is that before calendering the positive pole piece, adjust the roller gap X between the two rollers so that X = 0.195 mm, 0.193 mm, and 0.190, respectively. Mm, 0.185 mm; before calendering the negative pole piece, adjust the roller gap X between the two rollers so that X = 0.198 mm, 0.195 mm, 0.192 mm, and 0.186 mm respectively. The square aluminum shell lithium ion secondary batteries 043450A3B4-B6, 043450A3B7-B8, 043450A3B10-B12, 043450A3B13-B15 with dimensions of 50×34×4.5 mm were respectively prepared.

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Abstract

The preparation method for Li-ion cell plate comprises: coating and/or filling slurry contained active material on a collector body; drying, flattening by making plate pass gap between two rollers; wherein, before flattening, adjusting roller gap of two calenders as 1/2(D2+D1) <X<=1/10(D2+9D1); where, X for roller gap, D1/D2 for plate thickness before/after flattening. This invention can control plate thickness precisely, and prolongs cell service time.

Description

technical field [0001] The invention relates to a battery pole piece and a method for preparing the battery, and more specifically relates to a lithium-ion battery pole piece and a preparation method for the lithium-ion battery. Background technique [0002] In recent years, miniaturized lithium-ion secondary batteries have become more and more perfect, and are now widely used in portable electronic and communication equipment such as small cameras, mobile phones, and notebook computers. Due to environmental and other reasons, the market for electric bicycles and electric vehicles is also developing rapidly. Lithium-ion batteries have become the preferred energy source for the aforementioned power devices due to their high discharge voltage, high energy density, and long cycle life. [0003] In the manufacture process of lithium-ion battery, the preparation method of pole sheet comprises coating and / or filling the slurry containing positive electrode active material, conduct...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M10/38H01M10/40H01M4/139H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 肖峰沈河生张才毓
Owner BYD CO LTD
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