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A kind of composite negative electrode material, negative electrode, lithium ion battery and preparation method

A negative electrode material and negative electrode technology, applied in the field of electrochemical materials, can solve the problems of poor initial charge and discharge capacity and cycle performance, and achieve the effects of reducing local current density, alleviating continuous growth, and high specific surface area

Active Publication Date: 2021-10-22
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of poor initial charge-discharge capacity and cycle performance of negative electrode materials in existing lithium-ion batteries, the invention provides a composite negative electrode material, negative electrode, lithium-ion battery and a preparation method

Method used

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  • A kind of composite negative electrode material, negative electrode, lithium ion battery and preparation method
  • A kind of composite negative electrode material, negative electrode, lithium ion battery and preparation method
  • A kind of composite negative electrode material, negative electrode, lithium ion battery and preparation method

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Embodiment 1

[0029] A preparation method of composite negative electrode material:

[0030] Step 1. Cut the commercial melamine foam resin into a shape of 5cm×5cm×3cm, put it into a tube furnace, and carbonize it at 1200°C for 2h under the protection of nitrogen atmosphere, wash it with absolute ethanol after cooling, and dry it at 60°C , and then cut to obtain a foamed carbon matrix of 5cm×5cm×0.1cm;

[0031] Step 2: Put the metal lithium foil into the crucible, heat to 250°C to completely melt the metal lithium foil to obtain molten lithium; immerse the foamed carbon matrix in the molten lithium for 2 minutes, take it out and let it cool naturally to obtain the composite Negative material.

[0032] figure 1 Be the SEM figure of described melamine foam resin, figure 2 It is the SEM picture of carbonized foamed carbon matrix. It can be seen from the figure that the prepared foamed carbon matrix has a high open porosity, the open porosity can reach 99%, and the distribution of pores is ...

Embodiment 2

[0039] A preparation method of composite negative electrode material:

[0040] Step 1. Cut the commercial melamine foam resin into a shape of 5cm×5cm×3cm, put it into a tube furnace, and carbonize it at 1000°C for 4h under the protection of nitrogen atmosphere, wash it with absolute ethanol after cooling, and dry it at 60°C , and then cut to obtain a foamed carbon matrix of 5cm×5cm×0.1cm;

[0041] Step 2: Put the metal lithium foil into the crucible, heat to 180°C to completely melt the metal lithium foil to obtain molten lithium; immerse the foamed carbon matrix in the molten lithium for 4 minutes, take it out and let it cool naturally to obtain the composite Negative material.

Embodiment 3

[0043] A preparation method of composite negative electrode material:

[0044] Step 1. Cut the commercial melamine foam resin into a shape of 5cm×5cm×3cm, put it into a tube furnace, and carbonize it at 1300°C for 3h under the protection of nitrogen atmosphere, wash it with absolute ethanol after cooling, and dry it at 60°C , and then cut to obtain a foamed carbon matrix of 5cm×5cm×0.1cm;

[0045] Step 2: Put the metal lithium foil into the crucible, heat to 500°C to completely melt the metal lithium foil to obtain molten lithium; immerse the foamed carbon matrix in the molten lithium for 6 minutes, take it out and let it cool naturally to obtain the composite Negative material.

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Abstract

The invention specifically discloses a composite negative electrode material, a negative electrode, a lithium ion battery and a preparation method. In the preparation method, the carbonized foamed resin of melamine or its derivatives is used as a matrix, and then the matrix is ​​dipped into molten lithium to obtain a composite negative electrode material. Nitrogen-containing functional groups are uniformly distributed in the carbon foam matrix provided by the present invention, which has strong binding energy to lithium, and can homogenize the flow of lithium ions in the process of lithium ion deposition, which is beneficial to the uniform deposition of metal lithium and avoids the formation of lithium dendrites At the same time, the carbon foam matrix with a three-dimensional network structure also has a high specific surface area, which is conducive to reducing the local current density and further improving the deposition uniformity of lithium metal in the matrix. The hollow structure of the carbon foam matrix As an ion transport channel, it provides a carrier and disperses the aggregation of lithium ions / electrons during lithium deposition, which is beneficial to alleviate the continuous growth of lithium dendrites, thereby achieving the effect of inhibiting lithium dendrites and buffering volume expansion.

Description

technical field [0001] The invention relates to the technical field of electrochemical materials, in particular to a composite negative electrode material, a negative electrode, a lithium ion battery and a preparation method. Background technique [0002] Compared with the current commercial graphite anode, lithium metal has extremely high capacity (3860mA / g) and low potential (-3.040V vs. standard hydrogen electrode). Therefore, metal lithium anode is considered as the key anode material for next-generation high energy density. Batteries constructed with metallic lithium as the negative electrode can greatly increase the cruising range of new energy vehicles. [0003] Then, lithium batteries are very easy to form lithium metal dendrites and cause changes in battery volume during charging and discharging. Existing studies have found that when lithium metal foil is used as the negative electrode of lithium batteries, as the number of cycles increases, lithium dendrites grad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/382H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 王秋君张迪王波李文李昭进孙会兰
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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