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Cathode material of Li-ion battery and preparation method, battery cathode, battery thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems that the process is not easy to control, cannot take into account the overall performance of the battery, and the overall performance of the battery is reduced. Efficiency, improving comprehensive electrochemical performance, increasing the effect of charge and discharge capacity

Active Publication Date: 2007-11-21
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these processing methods, there are generally defects such as complex processing process, difficult process control, high cost, and inability to improve the overall performance of the battery, which affects mass production and industrialization.
In addition, due to the short application time of natural graphite as the negative electrode material of lithium-ion batteries, and natural graphite itself has a unique crystal and surface structure, if the negative electrode is prepared according to the conventional process and the battery is assembled, it often cannot achieve good results, resulting in the battery as a whole. Performance drop

Method used

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  • Cathode material of Li-ion battery and preparation method, battery cathode, battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The natural graphite with a crystallinity of 83% is pulverized by a rotary high-speed pulverizer at a rotation speed of 6000rpm, and then spheroidized by a low-speed impact spheroidizer at a rotation speed of 3000rpm, and then chemically purified by an air classifier to adjust the particle size. The fixed carbon content is greater than 99.9%, followed by oxidation treatment at 600°C for 3 hours, post-heat treatment in argon atmosphere for 5 hours, and the open pore density of the flat layer of carbon atoms with closed ends is 780 / μm. Weigh 180 grams of the above-mentioned graphite and mix it with 20 grams of medium-temperature petroleum pitch for 2 hours, raise the temperature to 1000° C. at a rate of 10° C. / minute under a nitrogen flow of 5 liters / minute, keep it warm for 2 hours, and then lower it to room temperature to obtain composite graphite.

[0022] Gained composite graphite is prepared electrode as follows: Weigh 95 grams of composite graphite, add 1 gram of car...

Embodiment 2

[0025] The natural graphite with a crystallinity of 96% is pulverized by a jet mill at a rotation speed of 6000rpm, and then spheroidized by an airflow vortex mill at a rotation speed of 3000rpm. The carbon content is greater than 99.9%, followed by fluoridation treatment at 500°C for 2.5 hours, and post-heat treatment in an argon atmosphere for 4.5 hours to obtain open pores with a closed-end carbon atom plane layer with a density of 500 / μm. Weigh 170 grams of pretreated graphite, mix it with 30 grams of coke for 3 hours, raise the temperature to 900° C. at a rate of 20° C. / min under an argon flow of 4 liters / minute, keep it warm for 3 hours, and then drop to room temperature. The obtained composite graphite prepared electrodes and assembled batteries according to the method of Example 1, and the measured reversible capacity was 361mAh / g, and the capacity retention rate after 500 cycles was 81%.

Embodiment 3

[0027] The natural graphite with a crystallinity of 85% is pulverized by a rod-type mechanical pulverizer at a rotation speed of 6000rpm, and then spheroidized by a superfine pulverizer at a rotation speed of 3000rpm. The fixed carbon content is greater than 99.9%, followed by hydrogenation treatment at 800°C for 3 hours, and post-heat treatment in an argon atmosphere for 5 hours to obtain an open pore density of 1500 carbon atoms / μm with a flat carbon atom layer at the closed end. Weigh 140 grams of the above-mentioned graphite Mix it with 60 grams of polyacrylonitrile for 2 hours, raise the temperature to 1200° C. at a rate of 1° C. / minute under a helium flow of 1 liter / minute, keep it warm for 0.5 hours, and then cool it down to room temperature to obtain composite graphite.

[0028] Gained composite graphite is prepared electrode by following method: take by weighing 94 grams of composite graphite, and 2 grams of carbon black, 3 grams of styrene-butadiene rubber latex SBR, ...

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Abstract

This invention discloses one lithium battery negative electrode materials and its process method, wherein, the battery negative electrode, battery, lithium battery negative material comprise sphere natural graphite and the irregular shape carbon with low crystal degree; the natural graphite core has the radius proportion of one to three micro characteristics. The process method comprises the following steps: grinding the natural graphite and shaping and purification processing; surface decoration and mixture with the carbon materials; mixture materials processing.

Description

technical field [0001] The invention relates to a high-capacity lithium-ion battery negative pole material and a preparation method thereof, and a lithium-ion battery negative pole and a lithium-ion battery using the high-capacity lithium-ion battery negative pole material. Background technique [0002] Anode materials are the key to miniaturization and high capacity of lithium-ion batteries. At present, the negative electrode material widely used in the production of lithium-ion batteries is carbon-based materials. When charging, Li + Interlayer formation of embedded graphitic structures similar to LiC 6 molecular structure. Graphite carbon anode materials have a soft structure, excellent performance of reversible lithium intercalation and desorption, good charge and discharge platform, and good safety performance, but the capacity of this type of material is limited, with a theoretical capacity of 372mAh / g. Due to the high degree of graphitization of natural graphite, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/04C01B31/02H01M10/40
CPCY02E60/122Y02E60/10
Inventor 岳敏张万红于作龙
Owner BTR NEW MATERIAL GRP CO LTD
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