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Graphite powder of lithium ionic cell cathode and preparation thereof

A lithium-ion battery, graphite powder technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high material cost, unable to replace graphite materials, immature application development of lithium-ion batteries, etc., to achieve high discharge capacity, improve The effect of material purity and low production cost

Active Publication Date: 2008-12-17
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of materials prepared by this method is high, and the application and development in lithium-ion batteries is not yet mature.
There is still no substitute for graphite materials

Method used

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  • Graphite powder of lithium ionic cell cathode and preparation thereof
  • Graphite powder of lithium ionic cell cathode and preparation thereof
  • Graphite powder of lithium ionic cell cathode and preparation thereof

Examples

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preparation example Construction

[0037] The graphite powder preparation method of lithium ion battery negative pole of the present invention comprises the following steps:

[0038] 1. Crush at least one of natural graphite, artificial graphite and other easily graphitizable carbon materials with a carbon content of 80.0-99.0% until the average particle size is in the range of 5-35 μm to obtain blocky, spherical or approximately spherical materials. Adopt the TWDJ turbine pulverizer of Zhejiang Tianyun Crushing Equipment Co., Ltd., or super whirlwind vortex mill (Jiangsu Sanwei Company LGWM-100 type), airflow vortex micronizer (Zhejiang Fengli Company's QWJ-5~30 type), Air separation pulverizer (700 type of Henan Yutong Company), double-roller pulverizer (2PGC600×750 type of Henan Xinyuan Company), jaw crusher (PEX250×1200 type of Henan Xinyuan Company).

[0039] 2. Add a coating modifier accounting for more than 0-30wt.% of graphite powder or / and a catalyst accounting for more than 0-10wt.% of graphite, and m...

Embodiment 1

[0056] Example 1: Grinding natural graphite with a carbon content of 85% to an average particle size D 50 =18μm, fully mixed with 20wt.% coal tar pitch to make a suspension, at a heating rate of 20℃ / min, under the protection of a nitrogen and hydrogen flow rate of 50L / h, preheating treatment under the condition of heating up to 1600℃ for 3h, Cool to room temperature, after breaking up, at a heating rate of 18°C / min, under the protection of nitrogen and hydrogen, flow rate 100L / h, heat up to 2600°C, keep warm for 80 hours, drop to room temperature, demagnetize and sieve to obtain nanoporous graphite powder. There are many pores on the surface of graphite powder, the nanopore diameter is 5-200nm, the porosity is 28%, and its average particle diameter is D 50 18.7μm, specific surface area 3.8m 2 / g, powder extrusion density is 1.74g / cm 3 . In this example, the nanoporous graphite negative electrode material prepared by surface coating modification and nanopore creation has un...

Embodiment 2

[0057] Embodiment 2: the natural graphite of carbon content 90% and the artificial graphite that carbon content is 87% are mixed in the ratio of 8:2, pulverized to average particle diameter D 50 =5μm, with 2wt.%Zr(OH) 4 Mix well, spray dry and granulate at 250°C, heat up to 300°C at a heating rate of 1°C / min, preheat for 30 hours, cool to room temperature, disperse, and heat at a heating rate of 10°C / min. Under the protection of nitrogen and chlorine, the flow rate is 80L / h, the temperature is raised to 3500°C for heat treatment for 12 hours, the temperature is lowered to room temperature, and the nanoporous graphite material is obtained by demagnetization and sieving. The nanopore diameter is 5-200nm, the porosity is 15%, and the average particle diameter is D 50 5.5μm, specific surface area 3.2m 2 / g, the powder extrusion density is 1.63g / cm 3 . In this embodiment, after adding catalyst, especially after high-temperature graphitization treatment and making nanopores, suc...

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Abstract

The invention discloses a graphite powder of the cathode of a lithium ion battery, and a preparation method thereof; the technical problem to be solved is that the transmission speed of a lithium ion and an electrolyte to the inside of the electrode needs to be increased. The graphite powder of the cathode of the lithium ion battery of the invention has the microscopic feature of massive, spherical and near-spherical shapes and has the characteristics of nano-porous. The preparation method thereof comprises the following steps of: grinding, adding coating modifiers or / and catalysts, mixing, dissolving, and carrying out preheating treatment and heat treatment. Compared with the prior art, the invention carries out modifying treatment to graphite material and realizes the characteristic of nano-porous by adding pore-forming agents, thus being beneficial to the transmission of the lithium ion, improving the liquid-absorbing performance of a pole piece after compaction, reducing the content of impurity in the graphite, improving the liquid-absorbing performance and the magnification performance of the graphite material, meeting the requirements of the lithium ion dynamic battery for the compatibility and the charging and discharging performance with large magnification of the electrolyte of the graphite material and having the advantages of lower production cost, simple technique and easy industrialization.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a graphite powder and a preparation method thereof. Background technique [0002] Because lithium-ion batteries have a series of significant advantages such as high working voltage, large specific energy, light weight, small size, long cycle life, no memory effect, fast charging and discharging, and no environmental pollution, they have become the most popular choice for cameras, mobile phones, and notebooks. The preferred power source for portable electronic appliances such as computers and portable measuring instruments is also an ideal power source for light high-energy power sources for electric vehicles, and has penetrated into aerospace, military and other cutting-edge technology fields. [0003] The current commercial lithium-ion battery anode materials are mainly various carbon-based materials. Graphite material has the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/38
CPCY02E60/10
Inventor 岳敏闫慧青贺雪琴张万红
Owner BTR NEW MATERIAL GRP CO LTD
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