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Cathode material of lithium ion cell and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of low discharge capacity and unsatisfactory performance, so as to prolong cycle life, increase charge and discharge capacity, The effect of improving overall performance

Active Publication Date: 2007-09-19
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Japanese Patent No. 2000-261046 discloses a thermal oxidation method to treat graphite powder to change the surface state of graphite powder. Although the reactivity between the negative electrode material and the electrolyte is improved, the discharge capacity is lower than that of natural graphite.
U.S. Pat. No. 6403259 discloses a carbon material coated on the surface by grinding natural graphite or artificial graphite, which improves the high-temperature self-discharge performance and low-temperature performance of the negative electrode material, but the performance in other aspects is not satisfactory

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  • Cathode material of lithium ion cell and preparation method thereof

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[0031] The preparation method of the lithium ion battery negative electrode material of the present invention comprises the following steps: 1. Mechanically pulverize the graphite raw material with high crystallinity using a high-speed pulverizer and undergo shaping and spheroidization by a low-speed spheroid pulverizer and a classifier; 2. Spherical The purified graphite is subjected to chemical purification and high-temperature purification to remove impurities in the graphite material. The fixed carbon content of the purified graphite is greater than 99.9%. Heat treatment at a temperature above 800°C in an inert atmosphere; 4. Mix high-purity graphite and carbon material precursors on a mixer for 1 to 5 hours; 5. Put the mixture into a heat treatment furnace at a flow rate of 1 to 10 liters / Heating in the mixed gas flow of nitrogen, argon, helium, neon or nitrogen, argon, helium and neon, the heating rate is 1-10°C / min, the temperature is 600-1200°C and the temperature is 0...

Embodiment 1

[0036] The natural flake graphite is crushed and spheroidized, and the particle size is adjusted to make the average particle size D 50 = 16 μm, then carry out chemical purification treatment to make the fixed carbon content greater than 99.9%, after purification treatment, use 500°C oxidation treatment, and then heat treatment at 800°C temperature in an inert atmosphere to obtain an opening with a flat layer of carbon atoms at the closed end The pore density is 720 / μm. Weigh 18 grams of the above-mentioned graphite and mix it with 2 grams of medium-temperature petroleum pitch for 2 hours, raise the temperature of the above-mentioned mixture to 1000° C. at a rate of 10° C. / minute under a nitrogen flow of 5 liters / minute, keep it warm for 3 hours, and then lower it to room temperature; After that, the final heat treatment is carried out, the heating rate is 10°C / min, the heat treatment temperature is 2700°C, and the temperature is kept for 480 hours. Measure the D of the above...

Embodiment 2

[0038] The natural flake graphite is crushed and spheroidized, and the particle size is adjusted to make the average particle size D 50 = 18 μm, followed by high-temperature purification treatment to make the fixed carbon content greater than 99.9%, oxidation treatment at 600°C after purification treatment, and heat treatment at 850°C in an inert atmosphere to obtain an opening with a flat layer of carbon atoms at the closed end The pore density is 850 / μm. Weigh 18 grams of the above-mentioned graphite and mix it with 2 grams of medium-temperature coal tar pitch for 5 hours, raise the temperature to 1200°C at a rate of 8°C / min under an argon flow of 10 liters / min, keep it warm for 0.5 hours, and then lower it to room temperature; For heat treatment, the heating rate is 8°C / min, the heat treatment temperature is 3200°C, and the temperature is kept for 5 hours. Measure the D of the above-mentioned composite graphite negative electrode material 50 =18.395μm, specific surface ar...

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Abstract

This invention discloses one lithium ion battery negative electrode materials and its process method, wherein the materials comprise sphere natural graphite and artificial graphite or sphere natural graphite and cross carbon, wherein, the sphere graphite is covered with graphite or cross carbon of different crystal degree. The graphite core has the radius proportion of one to three micro characteristics. The process method comprises the following steps: making the purification process on the graphite; mixing the carbon materials front drive; processing the low temperature carbon; finally making the thermal process.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] The oil crisis in the 1960s and 1970s and the increasing population made the contradiction of resource shortage increasingly prominent. Especially today, when people pay more and more attention to environmental protection, green power sources have developed rapidly. Lithium-ion batteries are a new generation of secondary batteries following the nickel-hydrogen batteries since the 1990s. And because of its advantages such as high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect, it has become the preferred chemical power source for high-end electronic consumer products, and has penetrated into aerospace, military and other cutting-edge technology fields. With its ever-increasing demand, lithium-ion batteries are becoming the focus and focus of scientific and technolog...

Claims

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Application Information

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