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Method for preparing high-density spherical ferric lithium phosphate as anode material of lithium-ion battery

A technology for lithium ion batteries and cathode materials, applied in the field of energy materials, can solve the problems of low packing density of lithium iron phosphate, hindering the practical application of materials, etc.

Inactive Publication Date: 2005-07-06
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.
So far, spherical lithium iron phosphate has not been reported in the literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepare a ferric nitrate aqueous solution with a concentration of 2 mol / liter, a phosphoric acid aqueous solution with a concentration of 2 mol / liter, and an ammonia solution with a concentration of 6 mol / liter. Use the metering pump to input ferric nitrate aqueous solution, phosphoric acid aqueous solution and ammonia solution into a reactor with a volume of 3 liters filled with deionized water in advance to react, control the flow rate of ferric nitrate aqueous solution and phosphoric acid aqueous solution to be 120 ml / hour, adjust The flow rate of the ammonia solution is to control the pH value of the reaction solution in the reactor to be 4.0±0.1. The temperature in the reactor was controlled to be 50°C. The mixed material in the reactor naturally overflows into the receiving tank. After feeding continuously for 20 hours, stop feeding, discharge the material in the reactor, and carry out solid-liquid separation with a centrifuge. Wash the solid product with deioni...

Embodiment 2

[0041] Prepare an aqueous solution of ferric chloride with a concentration of 1 mol / liter, an aqueous solution of ammonium dihydrogen phosphate with a concentration of 1 mol / liter, and an aqueous solution of sodium hydroxide with a concentration of 3 mol / liter. Use a metering pump to respectively input ferric trichloride aqueous solution, ammonium dihydrogen phosphate aqueous solution, and sodium hydroxide aqueous solution into a reactor with a capacity of 3 liters filled with deionized water in advance for reaction, and control the ferric trichloride aqueous solution and diphosphate diphosphate The flow rate of the ammonium hydrogen aqueous solution is 120 milliliters / hour, regulates the flow rate of the sodium hydroxide aqueous solution, and the pH value of the reaction solution in the control reactor is 4.0 ± 0.1. The temperature in the reactor was controlled to be 50°C. The mixed material in the reactor naturally overflows into the receiving tank. After feeding continuous...

Embodiment 3

[0043] Prepare an aqueous ferric sulfate solution with a concentration of 0.5 mol / liter, an aqueous solution of trisodium phosphate with a concentration of 1 mol / liter, and an aqueous ammonia solution with a concentration of 6 mol / liter. Use a metering pump to respectively input ferric sulfate aqueous solution, trisodium phosphate aqueous solution, and ammonia aqueous solution into a reactor with a volume of 3 liters filled with deionized water for reaction, and control the flow rate of ferric sulfate aqueous solution and trisodium phosphate aqueous solution to 120 ml / hour, adjust the flow rate of the ammonia solution, and control the pH value of the reaction solution in the reactor to 4.0±0.1. The temperature in the reactor was controlled to be 50°C. The mixed material in the reactor naturally overflows into the receiving tank. After feeding continuously for 20 hours, stop feeding, discharge the material in the reactor, and carry out solid-liquid separation with a centrifu...

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PUM

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Abstract

This invention discloses the method for preparing high-density spherical lithium ferric phosphate used as the positive material of lithium ion cell, which contains synthesizing the ferric iron salt aqueous solution, phosphorus source aqueous solution and alkali aqueous solution to form spherical or spheroid ferric phosphate precursor, uniformly mixed with lithium source, carbon source and doped metal compound after being washed and dried, high temperature heat treating at 600-900 degree centigrade for 8-48 hr under inertia or reducing atmosphere protection to obtain lithium ferric phosphate with mean grain size of 7-12 micrometer,2.0-2.2g / cm3 of tap density, high buck density of 140-155mAh / g first discharge ratio capacity at normal temperature, and high volume ratio capacity.

Description

technical field [0001] The invention belongs to the technical field of energy materials. In particular, it relates to a method for preparing a high-density spherical lithium iron phosphate as a cathode material of a lithium ion battery. 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. Currently, the most studied cathode material is LiC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/00C01D15/00C01G49/00H01M4/04H01M4/48H01M4/58H01M10/36
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 应皆荣雷敏姜长印万春荣陈克勤
Owner TSINGHUA UNIV
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