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Battery cathode and preparation method thereof, lithium ion battery using the cathode

A lithium ion and negative electrode technology, which is applied to the battery negative electrode and the preparation method thereof and the battery field using the negative electrode, can solve the problems of poor safety performance and the like, and achieve the effect of high safety performance

Active Publication Date: 2009-03-04
嘉善凝溪建设有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem of poor safety performance of lithium-ion secondary batteries in short-circuit conditions in the prior art, and provide a negative electrode capable of improving the safety performance of lithium-ion secondary batteries in short-circuit conditions and a preparation method thereof

Method used

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  • Battery cathode and preparation method thereof, lithium ion battery using the cathode

Examples

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preparation example Construction

[0023] The preparation method of the negative electrode of the present invention comprises coating and / or filling the slurry A containing the negative electrode active material, the binder and the solvent on the current collector, drying, calendering or non-calendering, and forming a collector with the negative electrode material. The electric body, wherein, the method also includes coating the slurry B containing the negative electrode active material, the binder, the thermally conductive material and the solvent on the current collector with the negative electrode material, drying, calendering or non-calendering, and the negative electrode material A thermally conductive film layer is formed on it; the thermal conductivity of the thermally conductive material is above 50 W / (m·K), preferably 200-500 W / (m·K).

[0024] The thermally conductive material can be any material with a thermal conductivity of 50 W / (m·K) or more, for example, a metal material. Preferably, the thermally ...

Embodiment 1

[0042] This example illustrates the battery negative electrode of the present invention, the lithium ion battery using the negative electrode and their preparation methods.

[0043] (1) Preparation of negative electrode

[0044] Add 10 kg of negative electrode active material natural graphite (Showa, Japan, SLMG-AO) and 400 g of binder polytetrafluoroethylene into 4 kg of N-methylpyrrolidone, and then stir in a vacuum mixer to form a stable and uniform slurry a. The slurry A was evenly coated on a copper foil, dried at 120° C. for 0.5 hour, and then rolled to form a current collector with the negative electrode material.

[0045] 300 grams of negative electrode active material natural graphite (Showa Japan, SLMG-AO) and 6 grams of aluminum powder (thermal conductivity is 240 watts / (meter Kelvin), and the average particle diameter is 0.5 micron) are mixed uniformly to obtain a mixture, and the mixture Add 900 grams of N-methylpyrrolidone, then add 30 grams of polytetrafluoroe...

Embodiment 2

[0051] Prepare the battery according to the method of Example 1, the difference is that the negative electrode is prepared as follows:

[0052] Add 10 kg of negative electrode active material natural graphite (Showa, Japan, SLMG-AO) and 400 g of binder polytetrafluoroethylene into 4 kg of N-methylpyrrolidone, and then stir in a vacuum mixer to form a stable and uniform slurry a. The slurry A was evenly coated on a copper foil, dried at 120° C. for 0.5 hour, and then rolled to form a current collector with the negative electrode material.

[0053] 300 grams of negative electrode active material natural graphite (Showa Japan, SLMG-AO) and 9 grams of copper powder (thermal conductivity is 400 watts / (meter Kelvin), and the average particle diameter is 5 microns) are mixed uniformly to obtain a mixture, and the mixture Add 900 grams of N-methylpyrrolidone, then add 15 grams of polytetrafluoroethylene, mix uniformly to obtain slurry B, apply the slurry B to the current collector wi...

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Abstract

The invention provides a negative electrode of a lithium ion secondary battery, comprising an electricity collector, negative electrode materials coated on or filled in the electricity collector and a layer of heat conduction films positioned on the negative electrode materials. The negative electrode material comprises active materials and adhesive; the layer of heat conduction films consists of active materials of the negative electrode, adhesive and heat conducting materials with thermal conductivity of more than 50 w / (m question mark k). In addition, the invention also provides a method for preparing the negative electrodes and the lithium ion battery with the negative electrode. The batteries with the negative electrodes prepared by the invention have high safety performance when a short circuit occurs.

Description

technical field [0001] The invention relates to a battery negative pole, a preparation method thereof and a battery using the negative pole, in particular to a battery negative pole, a preparation method thereof and a lithium ion battery using the negative pole. Background technique [0002] Lithium-ion secondary batteries generally comprise a battery case and a pole core and a non-aqueous electrolyte sealed in the battery case; the pole core comprises a positive pole, a negative pole and a diaphragm positioned between the positive pole and the negative pole; the positive pole comprises a positive electrode collector An electric body and a positive electrode material coated thereon; the positive electrode material includes a positive electrode active material, a binder and a conductive agent selectively contained; the negative electrode includes a negative electrode current collector and a negative electrode material coated thereon; the The anode material includes an anode a...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/62H01M4/04H01M10/40
CPCY02E60/122Y02E60/10
Inventor 司雷渠冰
Owner 嘉善凝溪建设有限公司
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