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Method for preparing cathode materials of power lithium ion secondary batteries

A secondary battery and negative electrode material technology, applied in the direction of electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of complex manufacturing process, less cycle times, environmental pollution, etc., and achieve complete pyrolysis, no shrinkage pores, and a state of fusion uniform effect

Inactive Publication Date: 2009-11-04
KENLI SANHE NEW MATERIAL TECH
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Problems solved by technology

At present, the manufacturing process of traditional lithium-ion secondary battery negative electrode materials is complicated, which has certain pollution to the environment. The lithium-ion secondary battery negative electrode materials produced have low capacity and low cycle times, which cannot meet the market's demand for power lithium-ion secondary battery negative electrode materials. There is an urgent need for a better preparation process to produce high-quality anode materials for lithium-ion secondary batteries to meet market demand.

Method used

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  • Method for preparing cathode materials of power lithium ion secondary batteries

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Embodiment approach

[0012] The preparation method is as follows: use qualified phenolic resin, wash with water, and dry at 50°C to obtain qualified raw materials, add the processed raw materials and additives into the carbonization furnace in a ratio of 50:1, vacuumize, and press 3-5 ℃ / min heating to 600-800℃, keep the temperature for 3-5 hours, then cool down to room temperature naturally, use a pulverizer to pulverize the obtained solid matter to 35um and finer sections, and classify the 5-30um powder with a classifier, The powder is added with a coating agent at a ratio of 1:100 and then stirred in a stirred tank for 2-3 hours. The temperature of the tank is controlled at 90-100°C. After that, the resulting mixture is placed in an oven and heated at a heating rate of 5-10°C / min. to 300°C, keep the temperature constant for 2-3 hours, then heat the material to 700°C in a vacuum state at a heating rate of 10-15°C / min, and keep the temperature constant for 2-3 hours. ℃ / min heating rate to 2800 ℃, ...

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Abstract

The invention relates to a method for preparing cathode materials of power lithium ion secondary batteries, which is mainly used for preparing the cathode materials of the power lithium ion secondary batteries. The preparation method mainly comprises the following steps: adopting phenol-formaldehyde resin as a raw material, adding a certain proportion of additive, placing the mixture into a carbonization furnace for carbonization in the vacuum state at the temperature of between 600 and 800 DEG C, using a crushing and classifying machine to crush and classify the obtained pyrolytic carbon after carbonization, using a certain proportion of coating agent to coat the obtained materials with the particle diameter of between 5 and 30 mu m, crosslinking the coating agent on the surface of the pyrolytic carbon at the temperature of 300 DEG C to form a coated shell, and preparing the cathode materials of the power lithium ion secondary batteries after performing carbonization on the coated materials at the temperature of 700 DEG C and high-temperature graphitization on the coated materials at the temperature of 2,800 DEG C, wherein the reversible capacity of the cathode materials of the power lithium ion secondary batteries reaches 600 mAh / g, the cycle index reaches 600 times, and the cycle efficiency reaches 96 percent.

Description

1. Technical field: [0001] The invention belongs to a preparation method in the field of chemical industry, and is mainly used for the preparation of a negative electrode material of a power lithium ion secondary battery. 2. Background technology: [0002] The anode material of the power lithium-ion secondary battery is a high-tech product, and its main function is to provide the anode material for the power lithium-ion secondary battery. At present, the manufacturing process of traditional lithium-ion secondary battery negative electrode materials is complicated, which has certain pollution to the environment. The lithium-ion secondary battery negative electrode materials produced have low capacity and low cycle times, which cannot meet the market's demand for power lithium-ion secondary battery negative electrode materials. There is an urgent need for a better preparation process to produce high-quality negative electrode materials for lithium-ion secondary batteries to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/38C01B31/04
CPCY02E60/12Y02E60/10
Inventor 梁延民冷亮曹会民伊常亮李新红
Owner KENLI SANHE NEW MATERIAL TECH
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