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Anode and lithium secondary battery comprising the same and method for preparation of the same

A positive electrode and positive electrode material technology, applied in the battery positive electrode and the battery field including the positive electrode, can solve the problems of poor heat dissipation performance and low overcharge safety, reduce the probability of internal short circuit of the battery, improve overcharge safety, expand Effects of application environment range

Inactive Publication Date: 2009-05-13
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of low overcharge safety and poor heat dissipation performance of the positive electrode of lithium secondary batteries in the prior art, and provide a battery positive electrode with high overcharge safety and good heat dissipation performance.

Method used

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  • Anode and lithium secondary battery comprising the same and method for preparation of the same
  • Anode and lithium secondary battery comprising the same and method for preparation of the same
  • Anode and lithium secondary battery comprising the same and method for preparation of the same

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preparation example Construction

[0039] The present invention also provides a method for preparing the positive electrode of the above-mentioned battery, the method comprising coating the slurry containing the positive electrode material on the current collector, baking, calendering, coating after coating or after baking or after calendering The current collector of the upper positive electrode material is perforated, wherein the total area of ​​the perforations is 0.5-50% of the area of ​​the current collector, and the perforations are irregular. According to the present invention, the positive electrode must be perforated after coating, that is, the positive electrode can be perforated after coating, baking or calendering. If the positive electrode is perforated before coating, the positive electrode active material will be distributed in the holes when coating the positive electrode material, which will increase the potential danger. Because the positive electrode active material is more distributed in the...

Embodiment 1

[0049] This example illustrates the positive electrode provided by the present invention, batteries including the positive electrode and their preparation methods.

[0050] (1) Preparation of positive electrode

[0051] 90 grams of polyvinylidene fluoride (Atofina Company, 761#PVDF) were dissolved in 1350 grams of N-methyl-2-pyrrolidone (NMP) solvent to prepare a binder solution, and then the previously mixed 2895 gLiCoO 2 Add 90 grams of acetylene black powder into the above solution, stir and mix evenly to prepare positive electrode slurry.

[0052] Use a pulper to coat the positive electrode slurry on both sides of an aluminum foil with a thickness of 20 microns at intervals, heat and dry under vacuum at 120°C for 1 hour, and perforate with a laser to make the shape of the perforation irregular. The front and back sides of the positive electrode are as follows: Figure 4 and Figure 5 As shown, the shaded part is the surface of the current collector coated with the positi...

Embodiment 2-4

[0061] Prepare battery positive electrode and lithium secondary battery according to the method of embodiment 1, difference is the timing of laser perforation, the ratio of the total area of ​​perforation to the current collector area and the positive active material (LiCoO2) on each positive electrode. 2 ) content is different, as shown in Table 1 below. Wherein, the front side and the back side of the positive electrode obtained in Example 2 are shown in Fig. 6 and Fig. Figure 7 Shown; The front and back of the positive pole that embodiment 3 obtains are respectively as Figure 8 and Figure 9 Shown; The positive side and the reverse side of the positive pole that embodiment 4 obtains are respectively as Figure 10 and shown in Figure 11.

[0062] Table 1

[0063]

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Abstract

A battery anode includes the set fluid and the anode material coated on the set fluid; the anode includes the anode material perforation through the set fluid and coating the set fluid, in which the said perforation total area is 0.5-50% of the set fluid area, and the said perforation is irregular. During the anode preparation process, through the perforation on the anode which perforated irregularly, the invention makes the capacity rate of the anode and cathode less than 1, to avoid the lithium dendrites formation on the cathode, therefore reducing battery internal short circuit rate, and increasing the overcharge security of the lithium secondary battery of the anode; in addition, the anode of the invention is beneficial the heat radiation of the batteries, making lithium secondary batteries normal storage and work in the high temperature environment, thereby expanding the lithium secondary batteries' application environment scope.

Description

technical field [0001] The present invention relates to a positive electrode of a battery, a battery including the positive electrode and a preparation method thereof, in particular to a positive electrode of a battery, a lithium secondary battery including the positive electrode and a preparation method thereof. Background technique [0002] Compared with traditional nickel-metal hydride and nickel-cadmium secondary batteries, lithium secondary batteries have many advantages, such as high energy density, light weight, and can be used in portable electronic products such as notebook computers; high operating voltage, low self-discharge, no memory Effect, can be charged and discharged multiple times; wide working temperature, can be used in many extreme environments; good safety performance, no gas generated during work; no environmental pollution, conducive to environmental protection, etc. [0003] A lithium secondary battery includes a positive electrode, a negative electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/64H01M4/04H01M10/40H01M10/38H01M4/13H01M4/139H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 肖峰周耀华黄保宁
Owner BYD CO LTD