Great current power lithium ion battery and method for making same

A lithium-ion battery and high-current technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problem of unsatisfactory high-current performance of lithium-ion batteries, unsatisfactory startup and acceleration climbing capabilities, and capacity density. and high energy density to achieve good cycle stability, good start-up, and low internal resistance

Active Publication Date: 2008-02-06
SHANGHAI FUYAN ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the capacity density and energy density of lithium-ion batteries are large, and the cruising distance after one charge is long; however, due to the unsatisfactory high-current performance of lithium-ion batteries, the starting, acceleration and climbing capabilities are not ideal, so the market application has been significantly restricted. limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 65wt.% positive active material LiCoO 2 , 20wt.% conductive agent acetylene black, 15wt.% binder polyvinylidene fluoride and solvent N-4-methylpyrrolidone equal to the total weight of the above-mentioned materials are mixed, and stirred at a high speed in a vacuum mixer for 10 hours to obtain Evenly distributed slurry. Then, it is coated on an aluminum foil, and the thickness is controlled to be 40 microns, and dried in a vacuum at 120° C. to obtain a coated positive electrode sheet. Similarly, the positive electrode active material was changed to the negative electrode active material CMS-G05 (Shanghai Shanshan Technology Co., Ltd.), and the coated negative electrode sheet was obtained according to the capacity corresponding to the positive electrode.

[0028] The coated positive pole piece and negative pole piece are respectively cut and rolled, and then coiled, welded, liquid injected, sealed and formed according to the production process of the power lithium-ion ba...

Embodiment 2

[0035] Change the positive electrode active material in embodiment 1 into LiMn 2 o 4 , the weight percentage is changed to 50wt.%, the amount of the conductive agent is changed to 30wt.%, the amount of the binder is changed to 20wt.%, the coating thickness is changed to 50 microns, and other conditions are unchanged, and the coated positive electrode is obtained. piece. Similarly, the amount of the conductive agent in the corresponding negative electrode was changed to 30wt.%, and the amount of the binder was changed to 20wt.%, to obtain a coated negative electrode sheet.

[0036] The coated positive pole piece and negative pole piece are respectively cut and rolled, and then coiled, welded, liquid injected, sealed and formed according to the production process of the power lithium-ion battery to obtain the power lithium-ion battery.

[0037] Compared with the power lithium ion battery prepared in Comparative Example 2, the power lithium ion battery has good rate performance...

Embodiment 3

[0043] Change the positive electrode active material in embodiment 2 into ternary positive electrode material Li[Co 1 / 3 Ni 1 / 3 mn 1 / 3 ]O 2 , the coating thickness was changed to 30 microns, and other conditions remained unchanged, and a coated positive electrode sheet was obtained. The thickness of the corresponding negative electrode is changed accordingly, and other conditions remain unchanged, and a coated negative electrode sheet is obtained.

[0044] The coated positive pole piece and negative pole piece are respectively cut and rolled, and then coiled, welded, liquid injected, sealed and formed according to the production process of the power lithium-ion battery to obtain the power lithium-ion battery.

[0045] Compared with the power lithium ion battery prepared in Comparative Example 3, the power lithium ion battery has good rate performance. See Table 1 for the capacity retention at different rates.

[0046] Table 1 The capacity retention rate of the power batter...

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Abstract

The present invention discloses a dynamic lithium ion battery with excellent ratio performance, and the plating technique of the electrode polar slice of the dynamic lithium battery. The powerful current dynamic lithium battery disclosed in the present invention is characterized in that, the coating thickness of the single layer polar slice of the battery is within 10mm to 50mm; the electrode active material selected in the battery cells is 25 to 65wt. percent; the conducting agents are 20 to 50wt. percent and the adhesives are 15 to 25wt. percent. After making the dynamic lithium ion battery with the battery polar slices made by the means of plating and as per the normal technique, the results prove that through adopting the dynamic lithium ion battery assembled by the plated electrode polar slices with the technique in the present invention, the present invention has the advantages of low internal resistance of the dynamic lithium ion battery, excellent starting and speed up as well as slope climbing abilities.

Description

technical field [0001] The invention relates to a coating method of a lithium-ion battery electrode pole piece, more specifically, the invention relates to a coating method of a power lithium-ion battery electrode pole piece. Background technique [0002] Current electric vehicles include electric vehicles such as electric bicycles, electric motorcycles, electric tricycles, and electric cars. In the electric vehicles mentioned above, rechargeable batteries currently available include Ni-Cd rechargeable batteries, lead-acid batteries, Ni-MH batteries and lithium-ion batteries. Due to the problems of low weight density and high environmental pollution, Ni-Cd rechargeable batteries have been greatly restricted, and are no longer used in civilian products. Since July 1, 2005, countries in the European Union have banned the production and sale of civilian lead-acid batteries. Therefore, rechargeable batteries that can be used for electric vehicles and have environmental friendl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/38H01M4/02H01M4/58H01M4/48H01M4/62H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 吴宇平张汉平戴兴生
Owner SHANGHAI FUYAN ENERGY TECH
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