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Lithium ion composite electrode material doped with citric acid and process thereof

A composite electrode and citric acid technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems that the application of electrode materials cannot be further improved, and the conductivity performance of LiFePO4 is not significantly improved, so as to improve the conductivity and charge-discharge performance. , The effect of good mixing degree and simple process

Inactive Publication Date: 2018-03-23
张彩缘
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But only adding rare earth elements, for LiFePO 4 The improvement of conductivity performance is not obvious, LiFePO 4 The application of electrode materials cannot be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First take 0.98 parts of lithium acetate (CH 3 COOLi·2H 2 O, analytically pure), 1 part of ferrous oxalate (FeC 2 o 4 ・2H 2 O, analytically pure), 1 part of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 , analytically pure) and 0.02 parts of Nd powder (analytical pure) were mixed and ground in an agate jar, and after grinding for a period of time, the yellow powder turned into porridge, accompanied by the smell of acetic acid. The material turns into light yellow powder, and the precursor powder is obtained. Take 5g of precursor powder and mix it evenly with 0.2g of citric acid (analytical pure). Under the condition of inert gas nitrogen atmosphere at 300°C, the resulting mixture powder is heat-treated for 6h, and then the temperature is raised to 500°C. After constant temperature heat treatment for 10 h, the obtained product was naturally cooled to room temperature under the protection of a nitrogen inert gas atmosphere, and a lithium ion composite electrode mate...

Embodiment 2

[0018] First take 0.97 parts of lithium acetate (CH 3 COOLi·2H 2 O, analytically pure), 1 part of ferrous oxalate (FeC 2 o 4 ・2H 2 O, analytically pure), 1 part of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 , analytically pure) and 0.03 parts of Nd powder (analytical pure) were mixed and ground in an agate jar, and after grinding for a period of time, the yellow powder turned into porridge, accompanied by the smell of acetic acid. The material turns into light yellow powder, and the precursor powder is obtained. Take 20g of precursor powder and mix it evenly with 0.8g of citric acid (analytical pure). Under the condition of inert gas and nitrogen atmosphere at 300°C, the resulting mixture powder is heat-treated for 8h, and then the temperature is raised to 500°C. After constant temperature heat treatment for 15 hours, the obtained product was naturally cooled to room temperature under the protection of a nitrogen inert gas atmosphere, and a lithium ion composite elect...

Embodiment 3

[0020] First take 0.95 parts of lithium acetate (CH 3 COOLi·2H 2 O, analytically pure), 1 part of ferrous oxalate (FeC 2 o 4 ・2H 2 O, analytically pure), 1 part of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 , analytically pure) and 0.05 parts of Nd powder (analytical pure) were mixed and ground in an agate jar, and after grinding for a period of time, the yellow powder turned into porridge, accompanied by the smell of acetic acid. The material turns into light yellow powder, and the precursor powder is obtained. Take 50g of precursor powder and mix it evenly with 2g of citric acid (analytical pure), put the mixture into a quartz glass tube sealed at one end, fill the inside with an appropriate amount of nitrogen, and then seal it with a high-temperature flame fused quartz tube at the other end. Put the sealed quartz glass tube into the water to verify the airtightness. If there are no bubbles, it can be considered that the airtightness is good. Heat the powder to 400°...

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Abstract

The invention relates to a lithium ion composite electrode material doped with citric acid and a process thereof. The process comprises the steps: firstly, taking lithium acetate (CH3COOLi.2H2O, analytically pure), ferrous oxalate (FeC2O4.2H2O, analytically pure), ammonium dihydrogen phosphate (NH4H2PO4, analytically pure), and an Nd powder according to the ratio of Li1-xNdxFePO4 and proportioning, placing in an agate pot, carrying out mixed grinding, grinding to become a pale yellow powder, then adding citric acid, mixing evenly, carrying out heat treatment for a period of time under the protection of an inert gas atmosphere and in the condition of the temperature of 300-400 DEG C firstly, and then carrying out isothermal heat treatment at the temperature of 500-550 DEG C for a period oftime, naturally cooling the obtained product to room temperature under the protection of an inert gas atmosphere, and thus obtaining the lithium ion composite electrode material powder doped with citric acid. The method has the advantages of simple process and low production cost, and the electric conduction and charge and discharge performance of the prepared electrode material powder is good.

Description

technical field [0001] The invention relates to a lithium ion electrode material and a preparation process thereof, in particular to a lithium ion electrode material doped with citric acid and a preparation method thereof, belonging to the field of battery electrode materials. Background technique [0002] At present, my country has become the largest producer and consumer of the battery industry. Earth-shaking changes have taken place in my country's battery application field, from semiconductor radios, small household appliances to communications and computers, and has rapidly expanded to new energy sources such as electricity and transportation in the 21st century. field, becoming one of the high-tech industries. The lead-acid and nickel-metal hydride batteries used before are gradually replaced by safe and efficient lithium batteries due to their short service life and easy pollution of the environment. With the demand for batteries in mobile phones, digital cameras and ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/362H01M4/5825H01M10/0525Y02E60/10
Inventor 张彩缘
Owner 张彩缘
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