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

A lithium-ion battery and negative electrode material technology, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of difficult control of the process, inability to take into account the overall performance of the battery, and the decline in the overall performance of the battery, so as to improve the charging and discharging Coulomb Efficiency, improving comprehensive electrochemical performance, and increasing the effect of charging and discharging capacity

Active Publication Date: 2005-11-30
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
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  • Claims
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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

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preparation example Construction

[0023]The preparation method of the lithium ion battery negative electrode material of the present invention comprises the following steps: 1. Passing the natural graphite with a crystallinity of 83-96% through a rotary high-speed pulverizer, an air-jet pulverizer, a high-pressure pulverizer or a rod-type mechanical pulverizer Pulverized, followed by spheroidization through a low-speed impact spheroidizing pulverizer, airflow vortex pulverizer, ultrafine pulverizer, ultrafine ball mill, internal classification impact pulverizer or pendulum pulverizer, and then through an airflow classifier, Jet classifier, sub-micron classifier or ultra-micron airflow classifier for shaping; 2. The spheroidized natural graphite is purified by chemical purification and high-temperature purification to remove impurities in the graphite material and make its fixed carbon content greater than 99.9% 3. After the above-mentioned graphite powder is subjected to oxidation treatment, fluorination treatm...

Embodiment 1

[0027] 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 spheroidizing pulverizer at a rotation speed of 3000rpm, and the particle size is adjusted by an air classifier. The fixed carbon content is more than 99.9%, then oxidized at 600°C for 3 hours, and post-heat treated in an argon atmosphere for 5 hours to obtain an open pore density of 780 / μm with a closed end carbon atom plane layer. 180 grams of above-mentioned graphite was weighed and mixed with 20 grams of medium-temperature petroleum pitch for 2 hours. Under a nitrogen flow of 5 liters / minute, the temperature was raised to 1000 DEG C at a rate of 10 DEG C / minute, kept for 2 hours, and then lowered to room temperature to obtain composite graphite.

[0028] The obtained composite graphite was prepared by the following method: Weigh 95 grams of composite graphite, add 1 gram of carbon black, 2.5 grams...

Embodiment 2

[0031] The natural graphite with a crystallinity of 96% is pulverized by a jet mill at a rotational speed of 6000 rpm, and then spheroidized by an air vortex mill at a rotational speed of 3000 rpm, and the particle size is adjusted by a jet classifier. The carbon content is greater than 99.9%, then fluorination treatment at 500°C for 2.5 hours, and post-heat treatment in an argon atmosphere for 4.5 hours, to obtain an open pore density of 500 / μm with a closed end carbon atom plane layer. 170 grams of pretreated graphite was weighed, mixed with 30 grams of coke for 3 hours, and heated to 900°C at a rate of 20°C / min under an argon flow of 4 liters / min, kept for 3 hours, and then lowered to room temperature. The obtained composite graphite was used to prepare an electrode and assemble a battery according to the method of Example 1. The measured reversible capacity was 361 mAh / g, and the capacity retention rate after 500 cycles was 81%.

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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 electrode material and a preparation method thereof, as well as a lithium-ion battery negative electrode and a lithium-ion battery using the high-capacity lithium-ion battery negative electrode material. Background technique [0002] Anode materials are the key to miniaturization and high capacity of lithium-ion batteries. At present, the anode material widely used in the production of lithium-ion batteries is carbon material. When charging, Li + Interlayer formation embedded in graphite structure similar to LiC 6 molecular structure. Graphite-like carbon negative electrode materials have a soft structure, excellent reversible lithium insertion and removal performance, a good charge and discharge platform, and good safety performance. However, this type of material has a limited capacity, with a theoretical capacity of 372mAh / g. Due to the high degree of graphitization of natural ...

Claims

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Application Information

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