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Improvement method for low temperature electrochemical performance of LiFePO4 material

A lithium iron phosphate, electrochemical technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of poor electrolyte compatibility, complex synthesis methods, and low structural stability, and achieve compatibility Good, simple synthesis method, good practical value effect

Inactive Publication Date: 2015-07-01
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the titanium compound used in the above report has the characteristics of good lithium ion conductivity, its structural stability is not high, its compatibility with the electrolyte is poor, and its synthesis method is relatively complicated.

Method used

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  • Improvement method for low temperature electrochemical performance of LiFePO4 material
  • Improvement method for low temperature electrochemical performance of LiFePO4 material
  • Improvement method for low temperature electrochemical performance of LiFePO4 material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take Lithium Carbonate, Iron Phosphate, Titanium Dioxide as Li:Fe:P:Ti=1.13:1:1:0.15 with the element molar ratio, then weigh glucose by 8% of the total mass of lithium source compound, Iron Phosphate, Titanium Dioxide; Ethanol is used as the medium, mixed and added to the ball mill, and the slurry is obtained after ball milling for 240 minutes, wherein ethanol accounts for 80% of the total mass of the slurry; the above slurry is spray-dried to obtain a precursor mixture, and the precursor mixture is placed in a bowl Roasted in a muffle furnace under the protection of argon, kept at 400 °C for 2 h, then raised to 750 °C for 6 h, and then cooled to room temperature with the furnace to obtain a composite material (Li 4 Ti 5 o 12 ) 0.03 / LiFePO 4 ;

[0030] Assemble the 2035 type button-type simulated battery to the (Li 4 Ti 5 o 12 ) 0.03 / LiFePO 4 Materials were tested for electrochemical performance. Aluminum foil is used as the positive electrode current colle...

Embodiment 2

[0033]Li: Fe: P: Ti=1.09: 1: 1: 0.1 take by weighing lithium carbonate, iron phosphate, titanium dioxide with element molar ratio, then weigh sucrose by 15% of the total mass of lithium source compound, iron phosphate, titanium dioxide; Acetone is used as a medium, mixed and added to a ball mill, and a slurry is obtained after ball milling for 120 minutes, wherein acetone accounts for 70% of the total mass of the slurry; the above slurry is spray-dried to obtain a precursor mixture, and the precursor mixture is placed in a bowl Roasted in a muffle furnace under argon protection, kept at 350°C for 2h, then raised to 650°C for 8h, and then cooled to room temperature with the furnace to obtain a composite material (Li 4 Ti 5 o 12 ) 0.02 / LiFePO 4 ;

[0034] Assemble the 2035 type button-type simulated battery to the (Li 4 Ti 5 o 12 ) 0.02 / LiFePO 4 Materials were tested for electrochemical performance. Aluminum foil is used as the positive electrode current collector, a...

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Abstract

The invention discloses an improvement method for the low temperature electrochemical performance of an LiFePO4 material. The method includes the steps of: (1) blending a lithium source compound, iron phosphate and a titanium source compound according to the mole ratio Li:Fe:P:Ti of (1+4x / 5+y):1:1:x, wherein x is greater than 1 and smaller than 0.25, y is greater than or equal to 0 and smaller than or equal to 0.1x, and then adding a carbon source according to 3-20% of the total mass of the iron phosphate, the lithium source compound and the titanium source compound; (2) adding the raw materials into a ball mill, taking deionized water, ethanol absolute or acetone as the solvent, and carrying out wet ball-milling for 0.5-24h so as to obtain a mixed slurry; (3) drying the mixed slurry and removing the solvent to obtain a precursor mixture; and (4) firstly pretreating the precursor mixture at 300-500DEG C for 0.5-8h in inert gas protection, then conducting aftertreatment at 650-800DEG C for 0.5-10h, naturally cooling the obtained product to room temperature in inert gas protection so as to obtain the lithium titanate modified LiFePO4 material. The method provided by the invention introduces lithium titanate on LiFePO4 grain surfaces or among the grains to enhance the lithium ion conductivity of the system so as to improve the low temperature electrochemical performance of the LiFePO4 material.

Description

technical field [0001] The invention relates to a method for improving the low-temperature electrochemical performance of a lithium iron phosphate material, belonging to the technical field of electrochemical energy materials. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, small self-discharge, no memory effect, and environmental friendliness. Its application fields have expanded from mobile phones and notebooks to power tools, light electric vehicles, hybrid electric vehicles, Space and other fields. For the rapidly developing large-scale lithium-ion power batteries, the application performance requirements such as battery safety, reliability and cycle life are more stringent than those of small-scale lithium-ion batteries for 3C. The choice of electrochemical system is to improve the safety and reliability of the battery. Basics of sex and cycle life. [0003] Lithium iron phosphate (LiFePO 4 ) has t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58C01B25/45
CPCC01B25/45H01M4/36H01M4/5825Y02E60/10
Inventor 赵挺张向军樊腾飞杨容刘丙学刘冠伟王琦江丹平
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG