Method for preparing novel lithium ion battery cathode materials

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high preparation cost, large irreversible loss, low charge and discharge capacity, etc., and achieve excellent processing performance, good appearance, and large satisfaction. The effect of large-scale production applications

Inactive Publication Date: 2015-04-01
山东兴丰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As anode materials for lithium-ion batteries, carbon materials still have disadvantages such as low charge-discharge capacity, large irreversible loss in the first cycle, co-intercalation of solvent molecules, and high preparation costs. These are also key issues that need to be solved in current research on lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Heat the carbon fiber spinnable pitch with a softening point of 250°C to 280°C to melt it into a fluid liquid, adjust the spinneret of the melt spinning machine to obtain pitch fiber precursors with a diameter of 20±1μm, and place the precursors in In the air, the temperature was raised to 260°C at a heating rate of 2°C / min, and oxidized for 4 hours. Under the protection of an inert gas, the pre-oxidized precursor was heated to 900°C at a heating rate of 10°C / min, and kept at high temperature. 2 hours, then cooled to room temperature. Then the carbonized precursor is subjected to high-temperature graphitization. Pass the graphitized carbon fiber filaments through a pulverizer to obtain short carbon fiber filaments with a length of 30 μm and length / diameter = 1:0.5. The graphitized carbon fibers are cut to obtain carbon fiber filaments with a length between 2 mm. Stir and mix the carbon fiber short filaments: carbon fiber long filaments at a ratio of 1:0.3 evenly to ob...

Embodiment 2

[0034] Heat the carbon fiber spinnable pitch with a softening point of 150°C to 180°C to melt it into a fluid liquid, adjust the spinneret of the melt spinning machine, and collect pitch fiber precursors with a diameter of 5±1 μm, and place the precursors in the In the air, the temperature was raised to 170°C at a heating rate of 1.5°C / min, and the oxidation treatment was carried out for 22 hours. 1 hour, then cooled to room temperature. Then the carbonized precursor is subjected to high-temperature graphitization. Pass the graphitized carbon fiber filaments through a pulverizer to obtain short carbon fiber filaments with a length of 20 μm and length / diameter = 1:0.4. The graphitized carbon fibers are cut to obtain carbon fiber filaments with a length of 2.5 mm. Stir and mix the carbon fiber short filaments: carbon fiber long filaments at a ratio of 1:0.4 evenly to obtain the lithium ion battery negative electrode material prepared in this example.

[0035] The performance ...

Embodiment 3

[0037] Heat the carbon fiber spinnable pitch with a softening point of 200°C to 230°C to melt it into a fluid liquid, adjust the spinneret of the melt spinning machine, and collect pitch fiber precursors with a diameter of 10±1μm, and place the precursors in In the air, the temperature was raised to 220°C at a heating rate of 4°C / min, and oxidized for 5 hours. Under the protection of an inert gas, the pre-oxidized precursor was heated to 950°C at a heating rate of 10°C / min, and kept at high temperature. 3 hours, then cooled to room temperature. Then the carbonized precursor is subjected to high-temperature graphitization. Pass the graphitized carbon fiber filaments through a pulverizer to obtain short carbon fiber filaments with a length of 25 μm and length / diameter = 1:0.5. The graphitized carbon fibers are cut to obtain carbon fiber filaments with a length between 3 mm. The ratio of carbon fiber short filaments: carbon fiber filaments = 1:0.5 was stirred and mixed evenly t...

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PUM

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Abstract

The invention discloses a method for preparing novel lithium ion battery cathode materials. The lithium ion battery cathode materials are made of carbon fiber filaments and carbon fiber short silk in a combined mode at a certain proportion, wherein the carbon fiber filaments and the carbon fiber short silk are different in length / diameter ratio. Carbon fiber spinnable pitch is used as raw materials, and after being carbonized and graphitized, obtained carbon fibers are close to graphite in material texture and better than the graphite in structure; as the carbon fibers are provided with multiple micro-pore structures, absorption and keeping of electrolytes can be guaranteed, rapid entering and rapid exiting of lithium ions are achieved, and the lithium ion battery cathode materials have the excellent circulation performance and are ideal cathode materials. As the size of the carbon fiber filaments and the size of the carbon fiber short silk are controlled and the proportion between the carbon fiber filaments and the carbon fiber short silk is optimized, the prepared cathode materials are excellent in processing performance, good in pole piece appearance and capable of meeting the requirement of lithium ion battery large-scale production application.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery. Specifically, the negative electrode material of the invention is formed by compounding carbon fiber filaments and short filaments with different length / diameter ratios in a certain ratio. Background technique [0002] Since the early 1990s, Japan's Sony Energy Technology Corporation first successfully developed lithium-ion batteries using carbon negative electrodes, lithium-ion batteries have rapidly occupied the civilian secondary battery market at an average annual rate of 15%, and have become the first choice for portable electronic devices. power supply. The rapid development of lithium-ion batteries is mainly due to the contribution of electrode materials, especially the progress of negative electrode materials. Lithium-ion battery anode materials are required to have the following characteristics: ① as low as possible electrode potential; ② ...

Claims

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Application Information

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IPC IPC(8): H01M4/583
CPCH01M4/583Y02E60/10
Inventor 田东
Owner 山东兴丰新能源科技有限公司
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