Method for preparing high-density spherical lithium iron phosphate and lithium iron manganese phosphate

A technology of lithium manganese iron phosphate and lithium iron phosphate, which is applied in chemical instruments and methods, manganese compounds, electrode manufacturing, etc., can solve the problems of low bulk density of lithium iron phosphate, hinder the practical application of materials, and low bulk density, and achieve protection Reduced atmosphere requirements, improved electrical conductivity, and wide range of raw material sources

Inactive Publication Date: 2005-06-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the disadvantage of low bulk density of lithium iron phosphate has been ignored and avoided by people and has not been solved, which hinders the practical application of the material.
At present, the lithium iron phosphate cathode materials reported at home and abroad are all composed of irregular flakes or granular particles, with low packing density.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Prepare ferrous sulfate, phosphoric acid, citric acid mixed aqueous solution, wherein ferrous sulfate concentration is 1.5 mol / liter, phosphoric acid concentration is 2.25 mol / liter, citric acid concentration is 0.15 mol / liter. Prepare an ammonia solution with a concentration of 10 mol / liter. Feed ferrous sulfate, phosphoric acid, citric acid mixed aqueous solution and ammonia solution into the reactor with a capacity of 3 liters filled with deionized water in advance with a metering pump to react, control ferrous sulfate, phosphoric acid, citric acid mixed aqueous solution The flow rate is 120 ml / hour, the flow rate of the ammonia solution is adjusted, and the pH value of the reaction solution in the reactor is controlled to be 5.0 ± 0.1. The temperature in the reactor was controlled to be 80°C. The mixed material in the reactor naturally overflows into the receiving tank. After continuous feeding for 30 hours, stop feeding, discharge the material in the reactor, and...

Embodiment 2

[0051] Prepare ferrous sulfate, ammonium dihydrogen phosphate, and tartaric acid mixed aqueous solution, wherein the concentration of ferrous sulfate is 0.5 mol / liter, the concentration of ammonium dihydrogen phosphate is 0.6 mol / liter, and the concentration of tartaric acid is 0.1 mol / liter. Prepare an ammonia solution with a concentration of 2 mol / liter. Ferrous sulfate, phosphoric acid, tartaric acid mixed aqueous solution and ammonia solution are input into the reactor of 3 liters of volumes that has been filled with deionized water in advance with metering pump to react respectively, and the flow rate of ferrous sulfate, phosphoric acid, tartaric mixed aqueous solution is controlled as 120 ml / hour, adjust the flow rate of the ammonia solution, and control the pH value of the reaction solution in the reactor to be 6.5±0.1. The temperature in the reactor was controlled to be 70°C. The mixed material in the reactor naturally overflows into the receiving tank. After continu...

Embodiment 3

[0053] Spherical lithium iron phosphate was prepared under the same conditions as in Example 1 with 2.25 mol / L of diammonium hydrogen phosphate instead of 2.25 mol / L of phosphoric acid. The measured average particle size of the product is 8-10μm, and the tap density is 2.05g / cm 3 . Using the lithium sheet as the negative electrode, the first discharge specific capacity of the lithium iron phosphate at room temperature was measured to be 150mAh / g.

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Abstract

This invention discloses a high-density ball ferric phosphate lithium and manganous phosphate iron lithium process method used in lithium ion battery positive electrode material in energy material process technique field. The process method comprises the following steps: to use ferric persulfate, phosphor or complex builder or manganese sulfate to process the mixture liquid; to react with the hartshorn solution to generate ball ferrous phosphate ammonium or manganese phosphate ferrous front driver; to mix it with lithium carbonate with mole proportion of one to one after washing and drying; under protection of nitrogen gas and after 600 to 900 degrees for 8 to 48 hours to get the ferric phosphate lithium or manganese phosphate ferrous.

Description

technical field [0001] The invention belongs to the technical field of energy materials. In particular, it relates to a method for preparing high-density spherical lithium iron phosphate and lithium manganese iron phosphate used for positive electrode materials of lithium ion batteries. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. It is widely used in mobile phones, notebook computers, UPS, Camcorders, various portable electric tools, electronic instruments, weapons and equipment, etc. also have good application prospects in electric vehicles, and are considered to be high-tech products that are of great significance to the national economy and people's lives in the 21st century. [0003] Cathode materials are an important part of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/00C01D15/00C01G1/02C01G45/00H01M4/04H01M4/48H01M4/58H01M10/36
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 应皆荣李维姜长印万春荣雷敏唐昌平高剑
Owner TSINGHUA UNIV
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