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Method of preparing nanoscale lithium iron phosphate / carbon composite anode material

A lithium iron phosphate and cathode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of lithium iron phosphate without cost advantage and high cost, achieve high cycle and rate performance, reduce production costs, and maximize The effect of capacity

Inactive Publication Date: 2014-01-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diversified raw materials and slightly complicated production process make lithium iron phosphate have no cost advantage in the market. The current market price of lithium iron phosphate is 100,000-170,000 / ton, which is 3-4 times that of lithium manganate, and the cost is high. become another obstacle on the road of its industrial development

Method used

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  • Method of preparing nanoscale lithium iron phosphate / carbon composite anode material
  • Method of preparing nanoscale lithium iron phosphate / carbon composite anode material
  • Method of preparing nanoscale lithium iron phosphate / carbon composite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 2.0786g (0.02mol) lithium dihydrogen phosphate (LiH 2 PO 4 ), 2.3168g (0.02mol) ferrous carbonate (FeCO 3 ,), 1g (0.0051mol) glucose (C 6 h 12 o 6 ·H 2 O), mix in an agate tank, add 80g of agate balls to make the ball milling body, 15ml of ethanol as the ball milling medium, 300rpm ball milling for 12h, the resulting mixed slurry is vacuum dried at 80°C for 2h to get the ball milling precursor, and the ball milling precursor is in an argon atmosphere , In a tube furnace, heat preservation at 250 degrees for 4 hours, and heat preservation at 700 degrees for 3 hours, to obtain nano-scale lithium iron phosphate / carbon composite cathode materials.

Embodiment 2

[0026] Weigh 0.7388g (0.01mol) lithium carbonate (Li 2 CO 3 ), 2.3006g (0.02mol) ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), 2.3168g (0.02mol) ferrous carbonate (FeCO 3 ), 1.141g (0.0033mol) sucrose (C 12 h 22 o 11 ), mixed in an agate jar, added 130g agate balls as ball milling body, 16ml ethanol as ball milling medium, 200rpm ball milling for 24h, 80°C vacuum drying for 2h to get ball milling precursor, ball milling precursor in argon atmosphere, tube furnace , heat preservation at 300 degrees for 2 hours, and heat preservation at 650 degrees for 4 hours to obtain nano-scale lithium iron phosphate / carbon composite cathode materials.

Embodiment 3

[0028] Weigh 1.32g (0.02mol) lithium acetate (CH 3 COOLi), 2.6411g (0.02mol) diamine hydrogen phosphate ((NH 4 ) 2 HPO 4 ), 2.3168g (0.02mol) ferrous carbonate (FeCO 3 ), 1.3641g (0.0071mol) citric acid (C 6 h 8 o 7 ), mixed in an agate jar, added 92g agate balls as ball milling body, 21ml ethanol as ball milling medium, 250rpm ball milling for 20h, 80°C vacuum drying for 2h to get the ball milling precursor, the ball milling precursor was in an argon atmosphere, in a tube furnace , heat preservation at 350 degrees for 2 hours, heat preservation at 600 degrees for 4 hours, and obtain nano-scale lithium iron phosphate / carbon composite cathode material.

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Abstract

The invention relates to a method of preparing a nanoscale lithium iron phosphate / carbon composite anode material. A lithium source, a phosphorus source and ferrous carbonate are mixed with a carbon source according to a stoichiometric ratio to form a mixture A; the mixture A is subjected to high-energy wet ball-milling and dried to obtain a precursor B; the precursor B is pre-burned and sintered in a protective atmosphere to obtain the nanoscale lithium iron phosphate / carbon composite anode material. By means of the method, the ferrous carbonate low in price is successfully used as an iron source for replacing iron trioxide or ferrous oxalate frequently used in a traditional solid phase method, so that nanoscale pure-phase lithium iron phosphate is prepared, and the production cost per ton of the lithium iron phosphate is lowered by 18-37 percent points. The obtained compound is fine in particle with the grain size ranging from 20nm to 200nm, and has good electrical conductivity. The capacity is maintained higher than 150 mAh / g after 100 times of 0.1C circulation and higher than 100 mAh / g at the time of 5C discharge, and therefore the nanoscale lithium iron phosphate / carbon composite anode material is an ideal anode material for a lithium ion battery.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a lithium ion battery, in particular to a method for preparing a nanoscale lithium iron phosphate / carbon composite positive electrode material by using cheap ferrous carbonate as an iron source. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) is a very promising cathode material for lithium-ion batteries, and the traditional lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) and other positive electrode materials, lithium iron phosphate does not contain precious elements, no environmental pollution; good platform characteristics, stable voltage; large theoretical capacity (170mAh / g); stable structure, excellent high temperature performance and thermal stability, safer, is The preferred cathode material for large-capacity and high-power lithium-ion batteries. Its industrialization and popularization are of great significance for improving b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 张建新丁昭郡姚斌路婷婷冯小钰
Owner SHANDONG UNIV
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