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Composite electrode material and preparation method thereof

A composite electrode and ferrous oxalate dihydrate technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex preparation process and high cost, and achieve the effect of simple preparation process, good uniformity and easy operation

Active Publication Date: 2015-11-11
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation methods of lithium iron phosphate mainly include solid phase method, liquid phase method, sol-gel method, microwave method, etc., liquid phase method, sol-gel method, microwave method, etc. are suitable for laboratory sample preparation, research and development, It is not suitable for large-scale industrial production. The solid-phase method has the advantages of simple operation and easy process control. It is suitable for large-scale production and is conducive to industrial development and promotion. However, most of them have complicated preparation processes and high costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Mix lithium dihydrogen phosphate, ferrous oxalate dihydrate, lithium carbonate, vanadium pentoxide, titanium dioxide, and manganese acetate in a molar ratio of 1:1:0:0:0:0, and then 10g according to the ratio / mol lithium dihydrogen phosphate adds phloroglucinol as a carbon source;

[0033] (2) Use a three-dimensional high-speed vibrating ball mill to grind and mix the raw materials. The material of the ball mill tank is polytetrafluoroethylene, and the grinding balls made of agate are selected. The amount of balls in the ball mill tank is one-third of the total volume of the tank. The raw material The total amount accounts for one-third of the total volume of the tank, the ball milling time is 1.5 hours, and the shimmy frequency is 1000 rpm;

[0034] (3) Put the ball-milled material into a dual-temperature zone rotary furnace and sinter in a nitrogen atmosphere. Before sintering, pass nitrogen gas for 30 minutes. The nitrogen flow rate is 0.14L / min. During the sint...

Embodiment 2

[0037] (1) Mix lithium dihydrogen phosphate, ferrous oxalate dihydrate, lithium carbonate, vanadium pentoxide, titanium dioxide, and manganese acetate in a molar ratio of 1:1:0.01:0:0:0, and then 10g according to the ratio / mol lithium dihydrogen phosphate adds phloroglucinol as a carbon source;

[0038] (2) Use a three-dimensional high-speed vibrating ball mill to grind and mix the raw materials. The material of the ball mill tank is polytetrafluoroethylene, and the grinding balls made of agate are selected. The amount of balls in the ball mill tank is one-third of the total volume of the tank. The raw material The total amount accounts for one-third of the total volume of the tank, the ball milling time is 1.5 hours, and the shimmy frequency is 1000 rpm;

[0039] (3) Put the ball-milled material into a dual-temperature zone rotary furnace and sinter in a nitrogen atmosphere. Before sintering, pass nitrogen gas for 30 minutes. The nitrogen flow rate is 0.14L / min. During the s...

Embodiment 3

[0042] (1) Mix lithium dihydrogen phosphate, ferrous oxalate dihydrate, lithium carbonate, vanadium pentoxide, titanium dioxide, and manganese acetate in a molar ratio of 1:1:0.02:0:0:0, and then 10g according to the ratio / mol lithium dihydrogen phosphate adds phloroglucinol as a carbon source;

[0043] (2) Use a three-dimensional high-speed vibrating ball mill to grind and mix the raw materials. The material of the ball mill tank is polytetrafluoroethylene, and the grinding balls made of agate are selected. The amount of balls in the ball mill tank is one-third of the total volume of the tank. The raw material The total amount accounts for one-third of the total volume of the tank, the ball milling time is 1.5 hours, and the shimmy frequency is 1000 rpm;

[0044] (3) Put the ball-milled material into a dual-temperature zone rotary furnace and sinter in a nitrogen atmosphere. Before sintering, pass nitrogen gas for 30 minutes. The nitrogen flow rate is 0.14L / min. During the s...

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Abstract

The invention provides a preparation method of a composite electrode material. The method comprises the step as follows: with lithium dihydrogen phosphate, ferrous oxalate dehydrate, lithium carbonate, vanadium pentoxide, titanium dioxide and manganese acetate as raw materials, and phenol substances such as phloroglucinol as carbon sources, the high-performance composite electrode material is prepared through a technology of combining solid-state doping and high-temperature sintering. The preparation method provided by the invention is easy to operate, short in production cycle, low in equipment requirements and beneficial to industrialized development, popularization and application; the preparation process is simple and convenient; and the prepared lithium iron phosphate composite electrode material has the advantages of excellent electrochemical property, high stability, high cycle performance and the like, and is mainly applied to various lithium ion batteries for energy storage devices, electric tools, light electric vehicles, small devices, small electric appliances, mobile power supply and the like.

Description

technical field [0001] The invention belongs to the field of electrode manufacture, and relates to a composite electrode material and a preparation method thereof, in particular to a lithium iron phosphate composite electrode material and a preparation method thereof. Background technique [0002] High-performance lithium iron phosphate composite electrode material is a new type of lithium-ion battery cathode material. The new cathode material concentrates LiCoO 2 , LiNiO 2 , LiMn 2 o 4 The respective advantages of cathode materials and their derivatives: no precious elements, extremely rich resources; moderate working voltage (3.4V); good platform characteristics, extremely stable voltage, comparable to regulated power supplies; theoretical capacity 170mAh / g; structure Stable, excellent safety performance, O and P are firmly combined with strong covalent bonds, making it difficult for the material to be decomposed by oxygen evolution; high temperature performance and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/62H01M4/625Y02E60/10
Inventor 何蕊刘振法张利辉李娜
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI