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Novel lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of complex operation, many steps, and high cost of use, and achieve simple and convenient operation, good economy, and good energy density and the effect of rate performance

Inactive Publication Date: 2020-11-13
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although ZIF-67 has been improved in the prior art and has achieved good technical results, it is still relatively seldom used in the field of lithium-ion battery negative electrodes, and the above-mentioned improvement steps are many, the operation is complicated, and a hydrothermal reactor is required. Toxic substances such as thioacetamide (2B carcinogens) are also used in equipment with high cost

Method used

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  • Novel lithium ion battery negative electrode material and preparation method thereof
  • Novel lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 0.01mol of Co(NO 3 ) 2 ·6H 2 O was fully dissolved in 100 mL deionized water to form solution A; then 0.04 mol of 2-methylimidazole and 0.03 mol of sodium thiosulfate were fully co-dissolved in 100 mL of deionized water to form solution B. Adjust the stirring rate of the magnetic stirrer to 400rpm, slowly drop solution A into solution B to form solution C, continue to stir for 2h, then let stand for 24 hours, and remove the supernatant. The precipitate in the lower layer was repeatedly centrifuged and washed with deionized water, and then the precipitate after centrifugal washing was dried at 70°C to obtain S-doped ZIF-67, which was designated as S-ZIF-67.

[0023] Add S-ZIF-67 and graphene oxide powder into the ball mill according to the mass ratio of 1:2, adjust the parameters of the ball mill, the ball powder ratio is 15:1, the speed is 200r / min, the ball milling time is 4h, so that S -ZIF-67 and graphene oxide powder are fully mixed, then moved to a tube fur...

Embodiment 2

[0025] This example differs from Example 1 in that the ratio of S-ZIF-67 to graphene oxide powder is 1:1, and the rest are the same as Example 1.

Embodiment 3

[0027] This example differs from Example 1 in that the ratio of S-ZIF-67 to graphene oxide powder is 1:3, and the rest are the same as Example 1.

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Abstract

The invention discloses a novel lithium ion battery negative electrode material and a preparation method thereof. The design thought is as follows: S-doped ZIF-67 is synthesized by adopting a one-stepmethod, and then the S-doped ZIF-67 and graphene oxide powder are jointly carbonized under inert gas to form a ZIF-67-based nano polyhedral composite material with a carbon skeleton protective layeron the outer layer, and the ZIF-67-based nano polyhedral composite material is used for the negative electrode of the lithium ion battery. The method is simple in step, expensive reaction instrumentsare not needed, and the prepared lithium ion battery is high in energy density, good in cycle performance and excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a novel lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become one of the most concerned high-performance batteries due to their advantages such as high energy density, high working voltage, long cycle life, and first-class safety and pollution-free, and are widely used in portable electronic products. The current commercial lithium-ion battery anode materials are mainly artificial graphite and natural graphite materials. Since the theoretical specific capacity of graphite material is only 372mAh·g -1 , so it cannot meet the increasing demand for energy density of lithium-ion batteries. It is inevitable to explore a new generation of high-performance anode materials for lithium-ion batteries. [0003] Metal-organic frameworks (Metal-Orangic Frameworks, MOFs) are...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/62H01M10/0525C08G83/00
CPCH01M4/602H01M4/625H01M10/0525C08G83/008H01M2004/021H01M2004/027Y02E60/10
Inventor 仰永军覃钰
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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