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Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of lithium-ion battery electrochemical performance, MOF materials are easy to agglomerate, etc., to achieve Reduce adverse effects, not easy to agglomerate, and adapt to volume changes

Inactive Publication Date: 2020-04-28
LANZHOU UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, annealing and calcination will change the original morphology of MOF materials, making MOF materials easy to agglomerate, and then the electrochemical performance of lithium-ion batteries will be affected to a certain extent.

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

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Embodiment Construction

[0032] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0033] The lithium ion battery negative electrode material provided by the invention is prepared by the following method:

[0034] Step 1: Pretreatment of carbon cloth

[0035] Cut the carbon cloth into a circle with a radius of 0.8 cm, put it into acetone, alcohol, and deionized water in turn, ultrasonically clean it for 30 minutes, and put it in an oven at 80°C for drying.

[0036] Step 2: Synthesis of Co(CO 3 ) 0.5 (OH) 0.11 h 2 o

[0037] Add 2mmol Co(No 3 ) 2 ·6H 2 0, 5mmol urea, 5mmol NH 4 F was mixed with 35 mL of deionized water and stirred at room temperature for 20 min to obtain a hydrothermal solution. Move the above-mentioned hydrothermal solution into the liner of the hydrothermal kettle and put the above-mentioned pretreated carbon cloth. The hydrothermal condition is 100°C for 6-10h (6h, 8h, 10h). After the reacti...

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Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the steps of (1) pretreating carbon cloth; (2) synthesizingCo(CO3)0.5(OH)0.11H2O by taking Co(No3)2.6H2O, urea and NH4F as raw materials and utilizing a hydrothermal method, wherein the hydrothermal condition is 100 DEG C for 6-10 hours; and (3) synthesizingan MOF material by taking 2-methylimidazole as a raw material and utilizing a chemical vapor deposition method, wherein the growth condition is 100 DEG C for 20-60 minutes. The preparation method hasthe beneficial effects that (1) the MOF material is directly synthesized by utilizing the chemical vapor deposition method, the obtained MOF material is non-conductive but has a porous structure, andthe porous structure is beneficial to permeation of an electrolyte and transmission of lithium ions and increases active sites of a reaction, so that the electrochemical performance of a battery is improved; (2) the obtained MOF material does not need to be annealed and calcined, and the original morphology is maintained, so that the adverse effect on the battery is reduced; and (3) the carbon cloth is used as a substrate to provide a conductive channel, so that the whole negative electrode material is ensured to have a conductive function.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries (LIBs) stand out among many energy storage devices due to their advantages such as high theoretical energy density, low self-discharge, long life, and small memory effect. able equipment. [0003] So far, there are three kinds of lithium battery materials widely studied: graphite, silicon and transition metal oxides, but each has its own shortcomings. For example: the theoretical specific capacity of graphite material (372mAh g -1 ) is low, which is increasingly unable to meet the development needs of lithium-ion batteries. In contrast, transition metal oxides can achieve high theoretical specific capacities (>600mAh g -1 ). Studies have shown that transition metal oxides have good conductivity and are relatively cheap, so they h...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525C08G83/00B82Y30/00
CPCH01M4/5825H01M4/62H01M10/0525C08G83/008B82Y30/00Y02E60/10
Inventor 潘孝军吴彩霞李小鹏
Owner LANZHOU UNIVERSITY
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