Method for preparing lithium ion battery active cathode material doped with composite carbon

A technology for lithium-ion batteries and negative electrode active materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of inability to break through compaction and compaction density, and achieve high specific capacity, low rebound, and long cycle life Effect

Active Publication Date: 2011-07-06
NINGBO HONGYUAN CARBON IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, batteries with high capacity and high volumetric energy are the key issues to be urgently solved. However, since the average thickness rebound of most electrode films using carbon negative electrode materials is above 20um, the maximum compaction density cannot exceed 1.70g / cm3
Unable to break through the bottleneck of low compaction and small rebound, which seriously hinders the development goal of power batteries requiring small volume and high capacity

Method used

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  • Method for preparing lithium ion battery active cathode material doped with composite carbon
  • Method for preparing lithium ion battery active cathode material doped with composite carbon
  • Method for preparing lithium ion battery active cathode material doped with composite carbon

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Embodiment Construction

[0036] Below in conjunction with embodiment the present invention is described in further detail.

[0037] Comparative implementation example 1

[0038] (1) Purify petroleum coke, pitch coke, and coal tar pitch coke to remove useless impurities;

[0039] (2) Add petroleum coke, pitch coke, and coal tar pitch coke materials in a ratio of 50:30:20 to 20-40% of medium-temperature asphalt, and take the coke weight as the basis, stir for 10-50 minutes, press it through a hydraulic press, and then press it at 1200-2000 Roasting at 1400°C for 1 to 2 days to obtain the basic material;

[0040] (3) Add 20-40% of the obtained base material into medium-temperature asphalt as an impregnating agent, and take the weight of the base material as a basis, carry out the first high-pressure dip-baking coating, the atmospheric pressure is 8-10kPa, and the soaking time is 7-9 hours. Then carry out the first high-temperature graphitization at a temperature of 2400-2600°C for 7-15 days to obtain t...

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Abstract

The invention discloses a method for preparing a lithium ion battery active cathode material doped with composite carbon, comprising the steps of: according to a patent number of 200710069679.X, preparing carbon powder M, doping spheroidized natural graphite, proportioning in a weight ratio of (65-75):(25-35), mixing and stirring, doping 15-30% of asphalt, carrying out high-pressure (an atmospheric pressure of 12-25kPa) soaking and baking for 7-9 hours, permeating, cladding and molding, carrying out high temperature graphitization at 2000-3200 DEG C for 7-15 days, and cooling and discharging to obtain composite graphite particles which are active cathode materials formed by combining synthetic graphite and natural graphite through an adhesive. The preparation method provided by the invention is simple in process, mature and stable, and resources are abundant; the lithium ion battery active cathode material prepared by utilizing the method has the characteristics of high specific capacity, high compacted density and low thickness rebound and is applicable to cylinders, soft packages, aluminum shells and high rate power batteries.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing active negative electrode materials of doped composite carbon F4-4 series lithium ion batteries. Background technique [0002] With the rapid development of small-portable-mobility of electronic and electrical products, and the urgent requirement for the development of zero-emission electric vehicles, the pollution-free green new high-energy chemical power supply has become a hot spot in the development of countries all over the world. Lithium-ion batteries have the characteristics of high platform voltage, high specific energy, regardless of memory effect, small self-discharge, and long life. They are the preferred new energy sources for the above-mentioned application fields. The negative electrode active material used in lithium-ion batteries is carbon materials. Carbon materials that can be used in lithium-ion batteries include: petroleum coke, arti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 顾向宏
Owner NINGBO HONGYUAN CARBON IND
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