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A kind of preparation method for the negative electrode material of lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of volume specific capacity decrease, poor cycle life, etc., achieve strong cycle performance and improve volume specific capacity.

Active Publication Date: 2021-05-25
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume expansion of such materials during the energy storage process is obvious, resulting in poor cycle life. Researchers often construct hollow structures to reduce the expansion effect, but hollow structures often cause the problem of volume specific capacity decline.

Method used

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  • A kind of preparation method for the negative electrode material of lithium ion battery
  • A kind of preparation method for the negative electrode material of lithium ion battery
  • A kind of preparation method for the negative electrode material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0027] A preparation method for a CoNiP negative electrode material for a lithium ion battery, the specific steps are as follows:

[0028] (1) Dissolve 100mg of nickel chloride and 600mg of polyvinylpyrrolidone in 60ml of water and ethanol (volume ratio 1:1), stir magnetically for 1 hour, then weigh 200mg of potassium cobaltcyanide and dissolve in 30ml of water. The two solutions were mixed, magnetically stirred for 1 h, aged at 50 ° C for 20 h, the precipitate was washed with ethanol, and centrifuged to obtain the organic framework material Ni / Co-PB (-PB represents the Prussian blue structure), which was dispersed in ethanol to obtain a suspension liquid;

[0029] (2) Pour 10ml of the suspension, 20ml of 1mol / L potassium hydroxide solution and 1ml of ammonia water into the hydrothermal reaction kettle for reaction, the reaction temperature is 80°C, and the reaction time is 20h. After the reaction kettle is naturally cooled, it is centrifugally cleaned. Vacuum drying to obtai...

Embodiment 2

[0034] A preparation method for a CoNiP negative electrode material for a lithium ion battery, the specific steps are as follows:

[0035] (1) Dissolve 100mg of nickel acetate and 800mg of EDTA in 70ml of water and ethanol (volume ratio 1:2), stir magnetically for 0.5h, then weigh 300mg of potassium cobaltcyanide and dissolve in 40ml of water, mix the two solutions Mix, magnetically stir for 0.5h, age at 40°C for 24h, wash the precipitate with ethanol, centrifuge to obtain the organic framework material Ni / Co-PB, and disperse it in ethanol to obtain a suspension;

[0036] (2) Pour 10ml of the suspension, 25ml of 2mol / L potassium hydroxide solution and 2ml of ammonia water into the hydrothermal reaction kettle for reaction, the reaction temperature is 80°C, and the reaction time is 20h. After the reaction kettle is naturally cooled, it is centrifugally cleaned. Vacuum drying to obtain a multi-layer hollow formwork, the number of inner walls of the hollow formwork is 2 layers, a...

Embodiment 3

[0040] A preparation method for a CoNiP negative electrode material for a lithium ion battery, the specific steps are as follows:

[0041](1) Dissolve 100 mg of nickel sulfate and 1 g of polyethylene glycol in 90 ml of water and ethanol (volume ratio 1:3), stir magnetically for 2.2 hours, then weigh 600 mg of potassium cobalt cyanide and dissolve in 50 ml of water. The two solutions were mixed, magnetically stirred for 1.8h, aged at 60°C for 17h, the precipitate was washed with ethanol, and centrifuged to obtain the organic framework material Ni / Co-PB, which was dispersed in ethanol to obtain a suspension;

[0042] (2) Pour 10ml of the suspension, 5ml of 5mol / L potassium hydroxide solution and 0.5ml of ammonia water into the hydrothermal reaction kettle for reaction, the reaction temperature is 100°C, and the reaction time is 12h. After the reaction kettle is naturally cooled, it is centrifugally cleaned. , dried in vacuum to obtain a multi-layer hollow formwork, the number of...

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Abstract

The invention discloses a method for preparing a multilayer hollow CoNiP negative electrode material for a lithium-ion battery. The method comprises first configuring a solution with water and ethanol as a solvent, nickel salt and an active agent as a solute, and then configuring potassium cobaltcyanide The aqueous solution, the two solutions were mixed, magnetically stirred and aged until the reaction was complete. The organic framework material Ni / Co‑PB was obtained by centrifugal washing and separation, dispersed in ethanol, mixed with potassium hydroxide solution and ammonia water for hydrothermal reaction, and then separated by centrifugal washing and vacuum dried to obtain a multilayer hollow template. The multilayer hollow template is calcined in the air atmosphere to obtain the multilayer hollow Ni / Co oxide, and the Ni / Co oxide is mixed with sodium hypophosphite for phosphating and calcined to obtain the CoNiP negative electrode material. The material obtained by the invention has rich pore structure, and the multilayer hollow structure can increase the cycle life and increase the volume specific capacity at the same time, and has excellent lithium storage performance when used in the negative electrode of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of material synthesis and energy, and in particular relates to a method for preparing a CoNiP material for a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, and no memory. They have been widely used in digital, energy storage, electric vehicles and other fields, and have become the most promising high-energy battery system. [0003] At present, commercial lithium-ion batteries mostly use graphite anode materials, but graphite materials have the disadvantage of low specific capacity, and its theoretical capacity is only 372mAh / g. Although metal oxide anodes have high theoretical capacity, they still suffer from low initial Coulombic efficiency, poor electrical conductivity, and poor rate performance. Therefore, the development of new high-performance anode materials is the key to the development of nex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCY02E60/10
Inventor 刘嘉铭王苏敏
Owner JIANGXI UNIV OF SCI & TECH
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