Positive pole piece and preparation method thereof and battery

A positive electrode plate and positive electrode activity technology, applied in the field of positive electrode plate and its preparation, can solve problems such as cracks in the positive electrode plate of a battery, and achieve the effects of good electrical conductivity, improved bonding strength, and improved rate performance.

Inactive Publication Date: 2013-06-19
SHENZHEN OCEANSUN BATTERY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem of cracking of the positive electrode sheet of the battery in the prior art, the present invention provides a positive electrode sheet, the cracking phenomenon of the positive electrode sheet is alleviated during use, and the position of the expansion and cracking of the positive electrode sheet is electronically conductive due to the network conduction. The existence of the layer is still unblocked, and the rate discharge performance and cycle performance of the battery are significantly improved

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  • Positive pole piece and preparation method thereof and battery
  • Positive pole piece and preparation method thereof and battery
  • Positive pole piece and preparation method thereof and battery

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preparation example Construction

[0024] At the same time, the present invention also discloses a method for preparing the above-mentioned positive electrode sheet, including:

[0025] S1. Uniformly mix the linear conductive material, polyvinylpyrrolidone, polyvinylidene fluoride, and a solvent to obtain a network conductive layer slurry, wherein the network conductive layer slurry has a viscosity of 200-1000Pa·s;

[0026] S2. Coating the network conductive layer slurry on the positive electrode current collector and baking to form a network conductive layer with a thickness of 2-10 μm on the positive electrode current collector;

[0027] S3, forming a positive electrode active layer on the surface of the network conductive layer.

[0028] Wherein, the linear conductive material, polyvinylpyrrolidone, polyvinylidene fluoride and solvent are mixed at a mass ratio of 10-70:5-10:5-20:900-980.

[0029] After forming the above-mentioned conductive network layer slurry, the conductive network layer slurry is coated...

Embodiment 1

[0047] This embodiment is used to illustrate the positive electrode sheet disclosed in the present invention and its preparation method.

[0048] Network conductive layer slurry preparation:

[0049] Mix CNT, PVP, binder PVDF, and solvent NMP uniformly at a mass ratio of 6:1:2:91, with a viscosity of 200-1000Pa·s, and coat the above slurry on the current collector with a coating thickness of 4-5μm , baked to obtain a current collector coated with a network conductive layer.

[0050] Positive pole piece preparation:

[0051] Weigh 97 grams of lithium cobaltate active material, 1 gram of CNT, and 3 grams of binder PVDF, mix them, add 200 grams of NMP and stir to obtain the active material slurry, and coat it on the aluminum current collector treated with the coating slurry , a drying temperature of 95° C., and a coating speed of 6 m / min to obtain a positive electrode sheet.

[0052] Battery production:

[0053] Prepare the negative pole piece according to the following metho...

Embodiment 2

[0055] This embodiment is used to illustrate the positive electrode sheet disclosed in the present invention and its preparation method.

[0056] Network conductive layer slurry preparation:

[0057] Mix metal silver wire (diameter 1.0 μm, length 50 μm), PVP, binder PVDF, and solvent NMP in a mass ratio of 1:1:1:97, with a viscosity of 200-1000 Pa s, and coat the above slurry on the set On the fluid, the coating thickness is 2-10 μm, and baked to obtain a current collector coated with a network conductive layer.

[0058] Positive pole piece preparation:

[0059] Weigh 97 grams of lithium cobaltate active material, 1 gram of carbon fiber VGCF, and 3 grams of binder PVDF to mix, add 200 grams of NMP and stir to obtain active material slurry, which is coated on the aluminum current collector treated with coating slurry above, the drying temperature is 95°C, the coating speed is 6m / min, and the positive electrode sheet is obtained.

[0060] Battery production:

[0061] Prepare...

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Abstract

The invention provides a positive pole piece which is characterized by comprising a positive pole current collector, a network conductive layer and a positive pole active layer in a sequential stacking mode. The network active layer comprises linear conductive material, polyvinylpyrrolidone (PVP) and polyvinylidene fluoride (PVDF). The linear conductive material is selected from one or more of carbon nano-tubes, carbon fibers, steel fibers, silver wires, platinum wires and conductive polymeric material. Meanwhile, the invention further discloses a preparation method of the positive pole piece and an alloy positive pole battery adopting the positive pole piece. In the using process of the disclosed positive pole piece, cracks caused by expansion of the alloy positive pole are obviously reduced, and the cycle performance and the rate discharge performance of the battery after the cracks appear are improved.

Description

technical field [0001] The invention relates to a positive pole piece, a preparation method thereof, and a battery using the positive pole piece. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, and high output power, and are widely used in electronics, transportation, energy and other fields. With the development of the new energy industry and the development of batteries with high energy density and high output power, alloy anodes have become the development direction of a new generation of high-capacity batteries because of their high capacity, high discharge platform, and excellent safety performance. However, alloy materials are generally accompanied by huge volume changes during the formation process, and the materials generate large stresses, which lead to cracks on the surface of electrode materials and cracks in current collectors, especially the positive electrode current collector aluminum foil (5...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/0525
CPCY02E60/10
Inventor 王涛
Owner SHENZHEN OCEANSUN BATTERY
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