Method for synthesizing positive material nano lithium manganese phosphate of lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., to achieve the effects of easy control of process parameters, expansion of research work, and high purity

Active Publication Date: 2013-10-02
常州孚达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using solvothermal method, using ethanol as solvent, various morphologies of LiMnPO can be obtained by simply changing the type of organic additives. 4 , which has not been reported in other patents

Method used

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  • Method for synthesizing positive material nano lithium manganese phosphate of lithium ion battery
  • Method for synthesizing positive material nano lithium manganese phosphate of lithium ion battery
  • Method for synthesizing positive material nano lithium manganese phosphate of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Dissolve 2mmol of manganese nitrate, 2.2mmol of lithium nitrate and 2mmol of phosphoric acid in 7mL of industrial alcohol, and stir to dissolve;

[0027] (2) Then pour the phosphoric acid solution directly into the lithium nitrate solution, and stir and mix evenly;

[0028] (3) Then pour the manganese nitrate solution into the mixed solution obtained in step (2), and continue to stir evenly;

[0029] (4) Take another 12 mL polyethylene glycol 400 and pour it into the mixed solution obtained in step (3), mix and stir evenly;

[0030] (5) Pour the solution obtained in step (4) into a 50mL polytetrafluoroethylene autoclave, seal, heat up to 150°C at a rate of 2°C / min, heat at a constant temperature for 12h, cool to room temperature naturally, and centrifuge the product. Wash with deionized water and ethanol, filter and dry.

Embodiment 2

[0032] (1) Dissolve 2mmol of manganese acetate, 2mmol of lithium acetate and 2mmol of phosphoric acid in 8mL of absolute ethanol, and stir to dissolve;

[0033] (2) Then, add lithium acetate solution dropwise to the phosphoric acid solution, and stir and mix evenly;

[0034] (3) Next, add the manganese acetate solution dropwise to the mixed solution obtained in step (2), and continue to stir evenly;

[0035] (4) Add octadecylamine to the mixture obtained in step (3), mix and stir uniformly, the total volume of the obtained solution is 36 mL;

[0036] (5) Pour the solution obtained in step (4) into a 50mL polytetrafluoroethylene autoclave, seal, heat up to 155°C at a rate of 3°C / min, heat at a constant temperature for 15h, cool to room temperature naturally, and centrifuge the product. Wash with deionized water and ethanol, filter and dry.

Embodiment 3

[0038] (1) Dissolve 2mmol of manganese acetate, 2.4mmol of lithium nitrate and 2mmol of phosphoric acid in 7mL of absolute ethanol, and stir to dissolve;

[0039] (2) Then add the phosphoric acid solution dropwise to the lithium nitrate solution, and stir and mix evenly;

[0040] (3) Next, pour the manganese acetate solution into the mixed solution obtained in step (2), and continue to stir evenly;

[0041] (4) Take another 14 mL of oleic acid and pour into the mixed solution obtained in step (3), mix and stir evenly;

[0042] (5) Pour the solution obtained in step (4) into a 50mL polytetrafluoroethylene autoclave, seal, heat up to 145°C at a rate of 3°C / min, and heat at a constant temperature for 10 hours; cool to room temperature naturally, and centrifuge the product. Wash with deionized water and ethanol, filter and dry.

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Abstract

The invention discloses a solvothermal synthesis method for a positive material nano lithium manganese phosphate of a lithium ion battery. The method comprises the following steps: uniformly mixing two ethanol solutions containing a lithium source and a phosphate radical source respectively; adding an ethanol solution containing a manganese source, uniformly stirring, and adding an organic additive; and finally, pouring the mixed solution into a reaction kettle, sealing, raising the temperature to be 140-150 DEG C at the speed of 1-5 DEG C per minute, and heating at a constant temperature for 6-24 hours. According to the method, nanoscale LiMnPO4 with the shape of capsules, sheets or cubes can be obtained, and the method has the advantages of low equipment investment, simple process flow, slight pollution, low energy consumption, controllable shape and small product particle size.

Description

Technical field [0001] The invention belongs to the field of electrochemical power supply material preparation, and specifically relates to a LiMnPO for lithium ion secondary batteries 4 Cathode material and its synthesis method. Background technique [0002] Lithium-ion secondary batteries have been widely used in portable devices such as mobile phones, digital cameras, and laptop computers. Layered lithium-containing transition metal oxide LiCoO that has been commercially used 2 With the problems of low safety and high price, future electrochemical energy devices need electrode materials with high energy density and high safety, and at the same time low cost and environmental friendliness. Olivine LiMPO 4 (M=Fe, Mn, Ni) cathode material has low cost and high thermal stability. LiFePO 4 The voltage to lithium is 3.45V, which remains stable even under overcharge and elevated temperature after thousands of charge / discharge cycles. And Mn 3+ / Mn 2+ Relative to Li + The electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 张汉平杨肖健梁姗姗
Owner 常州孚达新能源科技有限公司
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