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Method for preparing active electrode material of lithium ion battery

An active electrode material and a technology for lithium-ion batteries, which are applied in the fields of chemical engineering and energy and chemical industry, can solve the problems of the tap density of electrode materials and the adverse effects of energy density, and achieve high current charge and discharge performance, improve energy density, and process process. simple effect

Inactive Publication Date: 2012-07-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this adversely affects the tap density and energy density of the electrode material

Method used

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  • Method for preparing active electrode material of lithium ion battery
  • Method for preparing active electrode material of lithium ion battery
  • Method for preparing active electrode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] in H 2 O solution, FeCl was added in a molar ratio of 2:1 3 and FeCl 2 4H 2 O, stir evenly, quickly add 28% ammonia water, react for 30 minutes to get 3-12nm Fe 3 o 4 Nanocrystalline grains, the preparation mass percentage content is 1.0% Fe 3 o 4 aqueous solution. Add 2.0% sucrose and 2.0% polyvinyl alcohol into the above solution, and stir evenly to form a mixed liquid solution. The above mixture solution is sprayed and granulated with a gasification spray device at a temperature of 450°C to obtain spherical particles, and these spherical particles are further annealed at 600°C in nitrogen to obtain carbon / Fe 3 o 4 Negative material. attached figure 2 Scanning electron micrographs show that these Fe 3 o 4 The nanograins assemble into a continuous porous carbon framework to form micron-sized spherical particles. The carbon / Fe 3 o 4 The negative electrode material is made into the negative electrode of the lithium-ion battery, and the electrochemical per...

Embodiment 2

[0032] in H 2 O solution, FeCl was added in a molar ratio of 2:1 3 and FeCl 2 4H 2 O, stir evenly, quickly add 28% ammonia water, react for 30 minutes to get 3-12nm Fe 3 o 4 Nanocrystalline grains, the preparation mass percentage content is 0.6% Fe 3 o 4 aqueous solution. The above solution was added with 0.1% by mass of sucrose, 0.2% of dispersed natural graphite and 3.0% of block copolymer F127, and stirred evenly to form a uniform mixture solution. The above mixture solution was subjected to spray granulation with a gasification spray device at a temperature of 400° C. to obtain spherical particles. These spherical particles were further annealed at 600 °C in nitrogen to obtain porous graphite-coated Fe 3 o 4 Negative active material. The graphite-coated Fe 3 o 4 The negative electrode material is made into the negative electrode of the lithium-ion battery, and the electrochemical test is carried out.

Embodiment 3

[0034] in H 2 O solution, FeCl was added in a molar ratio of 2:1 3 and FeCl 2 4H 2 O, stir evenly, quickly add 28% ammonia water, react for 30 minutes to get 3-12nm Fe 3 o 4 Nanocrystalline grains, the preparation mass percentage content is 2.0% Fe 3 o 4 aqueous solution. The above solution was added with 1.0% by mass of sucrose, 0.1% of carbon nanotubes and 0.5% of block copolymer P123, and stirred evenly to form a uniform mixture solution. The above mixture solution was subjected to spray granulation with a gasification spray device at a temperature of 500° C. to obtain spherical particles. These spherical particles were further annealed at 560 °C in nitrogen to obtain porous carbon nanotube interpenetrated Fe 3 o 4 Negative active material. attached Figure 4 The scanning electron microscope photos of these negative electrode active materials show that these negative electrode active materials are in the form of spherical particles interspersed with carbon nanotu...

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Abstract

The invention discloses a method for preparing an active electrode material of a lithium ion battery. The method comprises the following steps of: preparing a nano-crystal with electrochemical activity into an aqueous solution, and adding a carbon source and a surface active agent into the aqueous solution to form a uniform and stable mixture solution; and preparing the mixture solution into spherical particles under the condition that the temperature is between 200 and 900 DEG C through a spray granulation method, and performing heat treatment on the spherical particles in 400-900 DEG nitrogen gas so as to form the active electrode material of the lithium ion battery. Conductive networks are distributed in the active electrode material, and the active electrode material has a porous structure, so that the active electrode material has good lithium ion and electron transmission channels; and the lithium ion battery prepared from the active electrode material has high specific capacity, high-current charging and discharging and high cyclical stability. The method for preparing the electrode material of the lithium ion battery through a spraying method can be easily applied to mass production, and is generally used for preparing various high-performance electrode materials of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of an active electrode material of a lithium ion battery, belonging to the fields of chemical engineering and energy chemical industry. Background technique [0002] With the intensification of human energy demand and the increasingly prominent environmental problems, lithium-ion batteries have a wide range of application markets. The structure of lithium-ion batteries is mainly composed of electrodes, separators and electrolytes. Among them, the development of lithium-ion batteries largely depends on the improvement of the performance of its electrode active materials. At present, lithium-ion batteries are widely used in many aspects such as mobile phones and notebook computers, but the expansion of lithium-ion batteries to electric vehicles and hybrid vehicles has encountered important problems, and its energy density and power density need to be further improved. [0003] The negative electrode active ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58
CPCY02E60/122Y02E60/10
Inventor 魏飞贾希来卢云峰
Owner TSINGHUA UNIV
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