Lithium iron phosphate lithium battery cathode material

A technology of lithium iron phosphate and positive electrode material, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of hindering the vigorous promotion of lithium iron phosphate, poor conductivity, low packing density, etc., to increase mutual contact and conductivity. Strong, bulk density effect

Active Publication Date: 2019-07-23
LIUZHOU HAOXIANGTE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, commonly used lithium iron phosphate cathode materials have defects of low bulk density and poor conductivity, which seriously hinder the vigorous promotion of lithium iron phosphate in practical applications.

Method used

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  • Lithium iron phosphate lithium battery cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A lithium iron phosphate lithium battery cathode material, comprising:

[0025] The positive active material is modified lithium iron phosphate doped with 0.1% titanium by mass, 0.2% magnesium by mass and 0.1% silver by mass; the preparation method of the positive active material is specifically:

[0026] 1) Using ferrous oxalate, lithium carbonate and ammonium dihydrogen phosphate as raw materials, the first lithium iron phosphate pre-synthesized by solid phase method at 673k;

[0027] 2) Divide the first lithium iron phosphate into two equal parts, put the first equal parts of the first lithium iron phosphate, magnesium oxalate and 0.1% polyvinyl alcohol by weight of the first lithium iron phosphate into agate In the ball milling jar, use ceramic grinding balls, and after ball milling for 8 hours, under the protection of nitrogen, keep the temperature at 480°C for 6 hours, and then naturally cool to room temperature to obtain the first prefabricated lithium iron phosp...

Embodiment 2

[0035] A lithium iron phosphate lithium battery cathode material, comprising:

[0036]The positive active material is modified lithium iron phosphate doped with 0.1% titanium by mass, 0.2% magnesium by mass and 0.1% silver by mass; the preparation method of the positive active material is specifically:

[0037] 1) Using ferrous oxalate, lithium carbonate and ammonium dihydrogen phosphate as raw materials, the first lithium iron phosphate pre-synthesized by solid phase method at 673k;

[0038] 2) Divide the first lithium iron phosphate into two equal parts, put the first equal parts of the first lithium iron phosphate, magnesium oxalate and 0.3% polyvinyl alcohol by weight of the first lithium iron phosphate into agate In the ball milling tank, select ceramic grinding balls, and after ball milling for 10 hours, under the protection of nitrogen, keep the temperature at 520°C for 8 hours, and then naturally cool to room temperature to obtain the first prefabricated lithium iron p...

Embodiment 3

[0046] A lithium iron phosphate lithium battery cathode material, comprising:

[0047] The positive active material is modified lithium iron phosphate doped with 0.1% titanium by mass, 0.2% magnesium by mass and 0.1% silver by mass; the preparation method of the positive active material is specifically:

[0048] 1) Using ferrous oxalate, lithium carbonate and ammonium dihydrogen phosphate as raw materials, the first lithium iron phosphate pre-synthesized by solid phase method at 673k;

[0049] 2) Divide the first lithium iron phosphate into two equal parts, put the first equal parts of the first lithium iron phosphate, magnesium oxalate and 0.2% polyvinyl alcohol by weight of the first lithium iron phosphate into agate In the ball milling tank, select ceramic grinding balls, and after ball milling for 9 hours, under the protection of nitrogen, keep the temperature at 500°C for 7 hours, and then naturally cool to room temperature to obtain the first prefabricated lithium iron p...

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Abstract

The invention discloses an anode material of a lithium iron phosphate battery. The anode material comprises an anode active material composed of, by mass, 0.1% of titanium, 0.2% of magnesium and 0.1% of silver-modified lithium iron phosphate. A preparation method of the anode active material specifically includes 1) preparing first lithium iron phosphate; 2) dividing the first lithium iron phosphate into two equal parts so as obtain first preliminary lithium iron phosphate and second preliminary lithium iron phosphate; 3), preparing to obtain second lithium iron phosphate and uniformly mixing the first preliminary lithium iron phosphate, the second preliminary lithium iron phosphate and the second lithium iron phosphate so as to obtain the anode active material. The anode material of the lithium iron phosphate battery is higher in electric conductivity and tapping density, so that power generation voltage stability of the battery is improved and service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode materials. More specifically, the present invention relates to a positive electrode material for a lithium iron phosphate lithium battery. Background technique [0002] Lithium battery is an energy storage device with high specific energy, which has the advantages of stable discharge voltage, wide operating temperature range, low self-discharge rate, cycle charge and discharge, long storage life, no memory effect and no pollution. At present, as the application fields of lithium-ion batteries become more and more extensive, different users have different requirements for lithium-ion batteries. In the field of low-temperature lithium batteries, the capacity requirements for low-temperature discharge are getting higher and higher. As an important component that affects the performance of lithium batteries, the positive active material of lithium batteries plays an important role....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 易鉴荣唐臻林荔珊
Owner LIUZHOU HAOXIANGTE SCI & TECH
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