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Method for preparing lithium iron phosphate composite material for lithium cells

A lithium iron phosphate and composite material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as insufficient purity and insufficient carbon coating, achieve high conductivity, solve poor electrical conductivity, and increase capacity.

Active Publication Date: 2011-05-04
南通丝乡丝绸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a preparation method of lithium iron phosphate composite material for lithium batteries to solve the problem of insufficient carbon coating or insufficient purity of products in traditional preparation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) 1.26 grams of lithium hydroxide (LiOH.H 2 (2, 0.03 mole) is dissolved in 100 milliliters of deionized water and is mixed with the lithium hydroxide solution that concentration is 0.3mol / L, adds 20 milligrams of graphene oxides, after stirring and dispersing, adds 0.99 gram of phosphoric acid (H 3 PO 4 , 99%, 0.01 moles) and 2.78 grams of ferrous sulfate (FeSO 4 ·7H 2 O, 0.01 mole), form a mixed solution;

[0016] 2) Put the mixed solution in a stainless steel reaction kettle lined with a polytetrafluoroethylene tank, fill it with argon and seal it with a cover; control the temperature in the stainless steel reaction kettle at 180° C., and react for 4 hours.

[0017] 3) Cool the reaction kettle to normal temperature naturally, then pour out the reaction solution, and obtain nano-powder after filtering the reaction solution; sequentially wash the nano-powder with ethanol and deionized water and then vacuum-dry to obtain lithium iron phosphate / graphene oxide composit...

Embodiment 2

[0020] 1) 3.78 grams of lithium hydroxide (LiOH.H 2 (2, 0.09 mole) is dissolved in 100 milliliters of deionized waters and is mixed with concentration and is the lithium hydroxide solution of 0.9mol / L, adds 90 milligrams of graphene oxides, after stirring and dispersing, adds 2.97 grams of phosphoric acid (H 3 PO 4 , 99%, 0.03 moles) and 8.34 grams of ferrous sulfate (FeSO 4 ·7H 2 0,0.03 moles), form a mixed solution;

[0021] 2) Put the mixed solution in a stainless steel reaction kettle lined with a polytetrafluoroethylene tank, fill it with argon and seal it with a cover; control the temperature in the stainless steel reaction kettle at 220° C., and react for 1 hour.

[0022] 3) Cool the reaction kettle to normal temperature naturally, then pour out the reaction solution, and obtain nano-powder after filtering the reaction solution; sequentially wash the nano-powder with ethanol and deionized water and then vacuum-dry to obtain lithium iron phosphate / graphene oxide compo...

Embodiment 3

[0025] 1) Dissolving 4.14 grams of lithium nitrate (0.06 moles) in 100 milliliters of deionized water to prepare a concentration of lithium nitrate solution of 0.6mol / L, adding 60 mg of graphene oxide, stirring and dispersing, adding 1.98 grams of phosphoric acid (H 3 PO 4 , 99%, 0.02 moles) and 3.48 grams of ferrous acetate (Fe(C 2 h 3 o 2 ) 2 , 0.02 moles), forming a mixed solution;

[0026] 2) Put the mixed solution in a stainless steel reaction kettle lined with a polytetrafluoroethylene tank, fill it with argon and seal it with a cover; control the temperature in the stainless steel reaction kettle at 200° C., and react for 2 hours.

[0027] 3) Cool the reaction kettle to normal temperature naturally, then pour out the reaction solution, and obtain nano-powder after filtering the reaction solution; sequentially wash the nano-powder with ethanol and deionized water and then vacuum-dry to obtain lithium iron phosphate / graphene oxide composite Material.

[0028] 4) Pla...

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PUM

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Abstract

The invention relates to a method for preparing a lithium iron phosphate composite material for lithium cells. The products prepared by the conventional method are undesirable in carbon encapsulation uniformity and purity. The method comprises: firstly, dissolving soluble lithium compound in deionized water to prepare lithium-containing solution in which the lithium ion concentration is 0.3 to 0.9mol / L, adding graphene oxide, stirring, and after the graphene oxide is dispersed, adding phosphoric acid and ferrite to form mixed solution; secondly, filling the mixed solution in a stainless reaction kettle, reacting for 1 to 4 hours at 180 to 220 DEG C, filtering reaction liquid, washing, and drying to obtain a lithium iron phosphate / graphene oxide composite material; and finally, charging hydrogen to perform a reduction reaction to obtain the lithium iron phosphate / graphene oxide composite material. In the lithium iron phosphate / graphene oxide composite nano material obtained by the method, the composition is uniform, the conductivity of lithium iron phosphate is improved greatly, the low conductivity of the lithium iron phosphate cathode material is overcome successfully, and the capacity under large-current discharge of the cells is improved.

Description

technical field [0001] The invention belongs to the technical field of energy material preparation, and in particular relates to a preparation method of a lithium iron phosphate composite material for a lithium battery. Background technique [0002] Lithium-ion battery, as a new energy source, has attracted widespread attention due to its unique advantages since its appearance. Lithium-ion batteries have the advantages of high voltage, large specific energy, no pollution, no memory effect, and long life. They have been widely used in portable electrical devices such as mobile phones, digital cameras, and notebook computers in the past ten years. Especially with the development of the electric vehicle industry, lithium-ion batteries, as one of its high-energy power sources, will undoubtedly have a broader demand. [0003] In the composition of lithium-ion batteries, the cathode material plays a decisive role in its electrochemical performance, safety performance and even the...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 袁求理聂秋林殷好勇
Owner 南通丝乡丝绸有限公司
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