Anode, cathode material conductive agent for lithium-ion secondary battery and preparation method thereof

A secondary battery and negative electrode material technology, applied in the direction of conductive materials, conductive materials, battery electrodes, etc., can solve the problems of high price and low practical value of carbon nanotubes

Active Publication Date: 2006-05-10
SHENZHEN SSZK NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the large-scale application of carbon nanotubes in the industry has not yet started, resulting in the high price of carbon nanotu...

Method used

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  • Anode, cathode material conductive agent for lithium-ion secondary battery and preparation method thereof
  • Anode, cathode material conductive agent for lithium-ion secondary battery and preparation method thereof
  • Anode, cathode material conductive agent for lithium-ion secondary battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Add 2g of carbon nanotubes and 1.2g of polyvinylpyrrolidone (PVP) to 100ml of deionized water or N-methylpyrrolidone; after ultrasonic dispersion, add 4g of acetylene black, and continue to mix by ultrasonic or high-speed stirring. The obtained mother liquor was suction-filtered into a sample with a dry weight of 20%. LiCoO as cathode active material for lithium-ion secondary batteries 2 4.7g, 0.75g of sample with a dry weight of 20%, 0.15g of LA132 positive electrode binder (provided by Chengdu Yindile Power Supply Co., Ltd.), disperse in a high-speed disperser for 30 minutes, and dry the mixed solution with a hair dryer to a certain viscosity The slurry is coated on the aluminum foil with a thickness of 60-80 μm. After drying at 100°C under vacuum, punch holes to make electrode sheets of φ16. A simulated battery was assembled with Cellgard2400 as the diaphragm and LiPF6 solution as the electrolyte. It was measured that it had a discharge specific capacity of 137mAh / ...

Embodiment 2

[0020] Add 0.6g of carbon nanotubes and 1.2g of polyvinylpyrrolidone (PVP) to 150ml of deionized water or N-methylpyrrolidone; after ultrasonic dispersion, add 5.4g of acetylene black, and continue to mix by ultrasonic or high-speed stirring. The obtained mother liquor was suction-filtered into a sample with a dry weight of 6%. The preparation of the electrode sheets, the assembly and testing of the simulated battery are the same as in Example 1. It is measured that it has a discharge specific capacity of 129mAh / g when charging and discharging at 1C, which is 88% of that at 0.2C.

Embodiment 3

[0022] Add 3g of carbon nanotubes and 0.6g of polyvinylpyrrolidone (PVP) to 100ml of deionized water or N-methylpyrrolidone; ultrasonically disperse for 5 minutes, then add 3g of acetylene black, and continue to mix by ultrasonic or high-speed stirring. The obtained mother liquor was suction-filtered into a sample with a dry weight of 15%. The preparation of the electrode sheets, the assembly and testing of the simulated battery are the same as in Example 1. It is measured that it has a discharge specific capacity of 141mAh / g when charging and discharging at 1C, reaching 0.2C

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Abstract

This invention discloses one second battery anode and negative conductive agent and its process method by use of carbon nanometer tube and acetylene black compound, wherein, the method comprises the following steps: Processing the mother liquid with concentration of 0.5 to 8 percent by adding the carbon nanometer tube and acetylene black compound into dispersion agent; or after adding the dispersion agent water or organic agent to dissipate the nanometer tube to process the low concentration mother liquid with 0.5 to 8 by adding acetylene black; The mother liquid passes filter or pressing to process compound conductive agent with dry weight of 6 to 60 percent. Comparing with conductive carbon or fiber, the nanometer tube has high capacity with high charging efficiency,

Description

technical field [0001] The invention relates to a lithium ion secondary battery positive electrode, a negative electrode material conductive agent and a preparation method thereof. Background technique [0002] Lithium-ion secondary battery is a new type of high-energy secondary power supply, which has the advantages of large specific capacity, high and stable discharge voltage, good low-temperature performance, environmental friendliness, safety, long life, and weak self-discharge. The above-mentioned advantages of lithium-ion secondary batteries have attracted the favor of scientists from various countries, thus promoting the rapid development of lithium-ion secondary batteries. Since its inception, in just over ten years, lithium-ion secondary batteries have been widely used in portable electronic products such as mobile phones, notebook computers, and digital cameras; other important fields such as electric vehicles, aerospace, military, etc. Large-scale lithium-ion sec...

Claims

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Application Information

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IPC IPC(8): H01M4/62C01B31/02H01B1/00H01M4/58
CPCY02E60/10
Inventor 张庆堂瞿美臻于作龙王国平周固民
Owner SHENZHEN SSZK NEW MATERIALS CO LTD
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