Positive electrode piece of lithium-ion power battery and preparation method thereof

A power battery and positive electrode technology, which is applied in the field of lithium ion power battery positive electrode and its preparation, can solve the problems of large internal resistance of the electrode and poor bonding between the positive electrode material and the current collector, etc. Tightly integrated, precisely controlled effects

Inactive Publication Date: 2014-01-15
万向电动汽车有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of poor adhesion between the positive electrode material and the current collector and the large internal resistance of the pole piece in the prior art, and provide a lithium ion battery with a tight bond between the positive electrode material and the current collector and small internal resistance of the pole piece. Power battery positive plate

Method used

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  • Positive electrode piece of lithium-ion power battery and preparation method thereof
  • Positive electrode piece of lithium-ion power battery and preparation method thereof
  • Positive electrode piece of lithium-ion power battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Preparation of carbon layer: Put 20 μm aluminum foil current collector into magnetron sputtering equipment, use 99.995% graphite target as carbon source, and vacuumize to 5×10 -3 Below Pa, pass O 2 Ar+O with volume percentage of 10% 2 Mix gas, keep the gas flow rate at 0.2Pa, adjust the sputtering current to 0.45A, bias voltage -50V, and sputter for 2000s to form a 1μm carbon layer.

[0031] (2) Preparation of cathode material slurry: 65 parts by weight of LiFePO 4 , 20 parts by weight of LiNiPO 4 , 8 parts by weight of superconducting carbon and 2 parts by weight of carbon nanotubes were baked at 100°C for 16 hours for later use, and 5 parts by weight of polyvinylidene fluoride was added to 80-100 parts by weight of N-methylpyrrolidone, and stirred After 12 hours, add 8 parts by weight of superconducting carbon and 2 parts by weight of carbon nanotubes, stir for 2 hours, and then add a total of 65 parts by weight of LiFePO in two equal amounts. 4 and 20 part...

Embodiment 2

[0047] (1) Preparation of the carbon layer: Put a 30 μm aluminum foil current collector into the magnetron sputtering equipment, use 99.995% graphite target as the carbon source, and evacuate to 5×10 -3 Below Pa, pass O 2 Ar+O with volume percentage of 10% 2 Mix gas, keep the gas flow at 0.2Pa, adjust the sputtering current to 0.6A, bias -50V, sputter for 6000s, and form a 3μm carbon layer;

[0048] (2) Preparation of cathode material slurry: 10 parts by weight of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , 10 parts by weight LiMn 2 o 4 , 36 parts by weight LiCoPO 4 , 20 parts by weight LiNiPO 4 , 20 parts by weight LiMnPO 4 , 2 parts by weight of conductive graphite, and 1 part by weight of conductive carbon black were baked at 120°C for 8 hours for later use, then 1 part by weight of polyvinylidene fluoride was added to 80-100 parts by weight of N-methylpyrrolidone, and stirred for 1 hour Then add 2 parts by weight of conductive graphite, 1 part by weight of conductive car...

Embodiment 3

[0062] (1) Preparation of the carbon layer: Put a 15 μm aluminum foil current collector into the magnetron sputtering equipment, use 99.995% graphite target as the carbon source, and evacuate to 5×10 -3 Below Pa, pass O 2 Ar+O with volume percentage of 10% 2 Mix gas, keep the gas flow at 0.2Pa, adjust the sputtering current to 0.2A, bias -50V, sputter for 200s, and form a 10nm carbon layer;

[0063] (2) Preparation of cathode material slurry: first, 5 parts by weight of LiAlO 2 , 10 parts by weight LiMgO 2 , 10 parts by weight of LiFe 1 / 3 co 1 / 3 mn 1 / 3 PO 4 , 5 parts by weight Li 2 AlO 3 , 5 parts by weight Li 2 NiO 3 , 5 parts by weight Li 2 MgO 3 , 5 parts by weight Li 2 CoO 3 , 25 parts by weight 0.4Li 2 MnO 3 0.6LiMnO 2 , 10 parts by weight of conductive carbon black and 10 parts by weight of flake graphite were baked at 80°C for 24 hours for later use, and 10 parts by weight of polyvinylidene fluoride was added to 80-100 parts by weight of N-met...

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Abstract

The invention relates to a lithium ion battery and particularly relates to a positive electrode piece of a lithium-ion power battery and a preparation method of the electrode piece. The positive electrode piece comprises a current collector and a positive electrode material, wherein a carbon layer is arranged between the current collector and the positive material and is formed by adopting a magnetron sputtering method, using a graphite target as a carbon source under an inert atmosphere and carrying out sputtering on the surface of the current collector; the carbon layer is 10nm-3mum in thickness. The preparation method comprises the following steps: (1) preparing the carbon layer; (2) preparing slurry of the positive electrode material; (3) coating a positive electrode; (4) rolling the positive electrode. The positive electrode piece has the advantages that the positive electrode material and a current body are bonded closely, so that the resistance of the electrode piece is small.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a positive electrode sheet of a lithium ion power battery and a preparation method thereof. Background technique [0002] At present, due to the increasing shortage of oil resources and increasingly serious environmental pollution, energy and the environment have become the focus of social attention. People's demand for large-capacity and high-power batteries is becoming more and more urgent, especially for automotive power batteries The higher it is, and to meet the requirements of vehicles, the cycle, rate, and safety performance of the battery are particularly important. Using roll coating or spraying technology to coat the carbon layer on the current collector and then coating the positive electrode material on the carbon layer is an improvement. One of the effective ways for battery cycle and rate performance. However, the use of existing roller coating and spray coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13H01M4/139
CPCH01M4/0404H01M4/131H01M4/1391H01M4/667Y02E60/10
Inventor 周伟瑛赵勇黄铭钢董峰
Owner 万向电动汽车有限公司
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