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Zinc-containing nitrogen-doped porous carbon-coated zinc-based negative electrode material for lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance and low negative electrode capacity, and achieve the effects of increasing capacity, preventing mechanical disintegration, and inhibiting aggregation.

Pending Publication Date: 2022-05-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, using nitrogen-containing MOFs material ZIF-8 as the precursor of porous carbon to carbon-coat ZnO can solve the technical problems of low capacity and poor cycle performance of the existing lithium-ion battery anode

Method used

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  • Zinc-containing nitrogen-doped porous carbon-coated zinc-based negative electrode material for lithium ion battery
  • Zinc-containing nitrogen-doped porous carbon-coated zinc-based negative electrode material for lithium ion battery
  • Zinc-containing nitrogen-doped porous carbon-coated zinc-based negative electrode material for lithium ion battery

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Embodiment 1

[0024] The preparation method of ZnO (ZnO@nitrogen-doped porous carbon / Zn) negative electrode material coated with nitrogen-doped porous carbon containing zinc for a lithium ion battery proposed by the present invention comprises the following steps:

[0025] S1: Dissolve 5 mmol of zinc acetate dihydrate in 50 mL of diethylene glycol, and heat to 160° C. under reflux for 1 h under stirring. After cooling to room temperature, the suspension was centrifuged at 4000rpm for 3h, and the colloidal product in the supernatant was used as the seed for the next step of synthesis;

[0026] S2: Dissolve 3mmol of zinc acetate dihydrate in 30mL of diethylene glycol, and when heated to 140°C under 400rpm stirring condition, add a certain volume of colloidal product in the supernatant to the solution, and then continue to heat and reflux at 160°C 1h. After cooling to room temperature, the product was collected by centrifugation and washed three times with methanol solution, then dispersed in...

Embodiment 2

[0033] The preparation method of ZnO (ZnO@nitrogen-doped porous carbon / Zn) negative electrode material coated with nitrogen-doped porous carbon containing zinc for a lithium ion battery proposed by the present invention comprises the following steps:

[0034] S1: Dissolve 5 mmol of zinc acetate dihydrate in 50 mL of diethylene glycol, and heat to 160° C. under reflux for 1 h under stirring. After cooling to room temperature, the suspension was centrifuged at 4000rpm for 3h, and the colloidal product in the supernatant was used as the seed for the next step of synthesis;

[0035] S2: Dissolve 3mmol of zinc acetate dihydrate in 30mL of diethylene glycol, and when heated to 140°C under 400rpm stirring condition, add a certain volume of colloidal product in the supernatant to the solution, and then continue to heat and reflux at 160°C 1h. After cooling to room temperature, the product was collected by centrifugation and washed three times with methanol solution, then dispersed in...

Embodiment 3

[0040] The preparation method of ZnO (ZnO@nitrogen-doped porous carbon / Zn) negative electrode material coated with nitrogen-doped porous carbon containing zinc for a lithium ion battery proposed by the present invention comprises the following steps:

[0041] S1: Dissolve 5 mmol of zinc acetate dihydrate in 50 mL of diethylene glycol, and heat to 160° C. under reflux for 1 h under stirring. After cooling to room temperature, the suspension was centrifuged at 4000rpm for 3h, and the colloidal product in the supernatant was used as the seed for the next step of synthesis;

[0042] S2: Dissolve 3mmol of zinc acetate dihydrate in 30mL of diethylene glycol, and when heated to 140°C under 400rpm stirring condition, add a certain volume of colloidal product in the supernatant to the solution, and then continue to heat and reflux at 160°C 1h. After cooling to room temperature, the product was collected by centrifugation and washed three times with methanol solution, then dispersed in...

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Abstract

The invention discloses a zinc-containing nitrogen-doped porous carbon-coated zinc-based negative electrode material for a lithium ion battery, the negative electrode material has a core-shell structure with ZnO nanoparticles as a core and a carbonized ZIF-8 skeleton as a shell, and a preparation method of the negative electrode material comprises the following process steps: S1, preparing ZnO nanoparticle seeds; s2, preparing ZnO nano particles, and dispersing the ZnO nano particles in a polyvinylpyrrolidone solution; s3, a ZIF-8 coated ZnO (ZnO at ZIF-8) material is prepared; and S4, preparing the zinc-containing nitrogen-doped porous carbon coated ZnO (ZnO at nitrogen-doped porous carbon / Zn) lithium ion battery negative electrode material. The ZIF-8 carbon matrix provides a conductive network, can inhibit aggregation of ZnO particles and buffer volume expansion of ZnO in a lithium intercalation process, and can prevent mechanical disintegration of the ZnO negative electrode material, so that the cycling stability of the material is improved.

Description

technical field [0001] The invention belongs to the field of new energy materials and lithium-ion batteries, and mainly relates to a zinc-based negative electrode material coated with zinc-containing nitrogen-doped porous carbon for lithium-ion batteries. Background technique [0002] Lithium-ion batteries are one of the most popular secondary batteries for portable electronics, have the best energy density and are the preferred power source for electric and hybrid vehicles. ZnO is an attractive material as a potential replacement for conventional graphite anodes in Li-ion batteries, as ZnO (978 mAh / g) is estimated to have a better theoretical capacity than graphite (372 mAh / g). However, high-capacity anodes (e.g., Zn-based) usually suffer from severe capacity fading due to the rapid aggregation of Zn particles and the large volume expansion during Li-ion intercalation that leads to anode material pulverization and electrical separation of active materials. At present, the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62
CPCH01M4/366H01M4/485H01M4/625H01M4/628
Inventor 吴正明胡淑婉陆大班张峥
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY