Battery negative electrode and lithium secondary battery having same

A lithium secondary battery and negative electrode technology, applied in the field of lithium secondary batteries, can solve the problems such as the negative electrode active material is not easy to loosen, the batching process is complicated, and the negative electrode active material is improved, so as to improve the cycle discharge capacity, improve the first charge and discharge efficiency, and improve the The effect of capacity

Inactive Publication Date: 2007-03-14
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art that the lithium secondary battery negative electrode ingredients are complex and the negative electrode active materials are easy to loose, and to provide a simple preparation process, which is not easy to loose between the negative electrode active materials and can improve the initial charge of the battery. Discharge efficiency, 1st cycle discharge capacity, and 2nd cycle discharge capacity lithium secondary battery negative electrode

Method used

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  • Battery negative electrode and lithium secondary battery having same

Examples

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preparation example Construction

[0020] The preparation method of the negative electrode material and the method of coating the negative electrode material on the current collector to form the negative electrode material layer are known to those skilled in the art. For example, the preparation method of the negative electrode material includes preparing the negative electrode active material, the binder and the optionally contained conductive agent into a negative electrode material slurry with a solvent, and the solvent can be mixed with the negative electrode active material, the binder and the optionally contained conductive agent. The agent can be added at the same time, or it can be added to the binder first to prepare the binder into a binder solution or emulsion, and then the negative electrode active material and the optional conductive agent are added to the binder solution or emulsion to prepare a negative electrode The amount of material slurry and solvent added can be flexibly adjusted according to...

Embodiment 1

[0032] This example is used to illustrate the preparation of the lithium secondary battery of the present invention.

[0033] (1) Preparation of positive electrode

[0034] 100 parts by weight of the positive electrode active material LiCoO 2 , 4 parts by weight of binder polyvinylidene fluoride (PVDF), 4 parts by weight of conductive agent acetylene black are added to 40 parts by weight of N-methylpyrrolidone (NMP), and then stirred in a vacuum mixer to form a stable and uniform dispersion Cathode material slurry. The slurry is evenly coated on a wide aluminum foil with a width of 400 mm and a thickness of 20 microns, then, after drying at 120 ° C and rolling, it is cut into 385 mm × 42 mm × 135 micron on a slitting machine. Positive sheet.

[0035] (2) Preparation of negative electrode

[0036] 100 parts by weight of negative electrode active material natural graphite, 4 parts by weight of binder polytetrafluoroethylene (PTFE), 4 parts by weight of conductive agent carbo...

Embodiment 2-13

[0040] The steps of Example 1 were repeated to prepare LP053048 square lithium secondary battery S2-13, except that the thickness of the lithium alloy layer was shown in Table 1.

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Abstract

This invention relates to lithium secondary battery cathode, which comprises integration and cathode materials layer on the integration part, wherein, the battery cathode comprises lithium alloy layer outside cathode layer; the battery has high initial discharging efficiency and first recycle discharging capacity and second one.

Description

technical field [0001] The invention relates to a lithium secondary battery negative pole and a lithium secondary battery containing the negative pole. Background technique [0002] Lithium secondary battery is a new kind of green chemical energy. Compared with traditional nickel-cadmium batteries and nickel-metal hydride batteries, it has the advantages of high voltage, long life and high energy density. Therefore, since Japan's Sony Corporation launched the first generation of lithium secondary batteries in 1990, it has been rapidly developed and widely used in various portable devices. In recent years, with the needs of energy and environment, lithium-ion batteries have been used more and more widely due to their advantages such as high voltage, light weight, no memory effect, long cycle life and no environmental pollution. [0003] Traditional lithium secondary batteries usually use graphitized carbon materials (such as natural graphite, artificial graphite) and non-gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/66H01M4/58H01M4/62H01M10/40H01M4/134H01M4/38H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 肖峰江文锋
Owner BYD CO LTD
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