Preparation method of porous carbon-tin nanocomposite material for lithium battery cathode

A nanocomposite material and composite material technology are applied in the field of preparation of porous carbon-tin nanocomposite materials for lithium battery negative electrodes, which can solve the problems of poor conductivity, consumption of lithium ions, restricting high capacity, etc., and achieve the effect of short preparation time.

Active Publication Date: 2014-11-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since tin dioxide, as the negative electrode material of lithium-ion batteries, will be reduced to simple tin by lithium ions in the electrode reaction, the process will consume lithium ions in the system and form Li with poor conductivity. 2 O exists around the electrode material, which restricts its high capacity

Method used

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  • Preparation method of porous carbon-tin nanocomposite material for lithium battery cathode
  • Preparation method of porous carbon-tin nanocomposite material for lithium battery cathode
  • Preparation method of porous carbon-tin nanocomposite material for lithium battery cathode

Examples

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Embodiment 1

[0027] A method for preparing a porous carbon-tin nanocomposite material for a negative electrode of a lithium battery, the principle of which is as follows figure 1 As shown, the following steps are taken:

[0028] The first step: the present invention prepares a porous carbon matrix by carbonizing waste crops at 500°C.

[0029] The second step: the porous carbon matrix is ​​dispersed in a 0.1 mol / L tin precursor solution to obtain a porous carbon-tin dioxide composite material.

[0030] The third step: heating and reacting the porous carbon-tin dioxide composite material with the sucrose solution to obtain the precursor of the carbon-coated nanocomposite material.

[0031] Step 4: Seal the precursor prepared in the previous step in a metal can under a nitrogen atmosphere, and at the same time heat the tube furnace to 900°C, and keep the furnace mouth of the tube furnace open. Use long-handled metal tongs to hold the metal can containing the precursor, and let it react brie...

Embodiment 2

[0034] A method for preparing a porous carbon-tin nanocomposite material for a lithium battery negative electrode, comprising the following steps:

[0035] The first step: the present invention prepares a porous carbon matrix by carbonizing waste crops at 700°C.

[0036] The second step: the porous carbon matrix is ​​dispersed in a 0.5 mol / L tin precursor solution to obtain a porous carbon-tin dioxide composite material.

[0037] The third step: heating and reacting the porous carbon-tin dioxide composite material with the sucrose solution to obtain the precursor of the carbon-coated nanocomposite material.

[0038] Step 4: Seal the precursor prepared in the previous step in a metal can under a nitrogen atmosphere, and at the same time heat the tube furnace to 950°C, and keep the furnace mouth of the tube furnace open. Use long-handled metal pliers to hold the metal can containing the precursor, and let it react briefly in a high-temperature tube furnace for 10 minutes, then ...

Embodiment 3

[0041] A method for preparing a porous carbon-tin nanocomposite material for a lithium battery negative electrode, comprising the following steps:

[0042] The first step: the present invention prepares a porous carbon matrix by carbonizing waste crops at 600°C.

[0043] The second step: the porous carbon matrix is ​​dispersed in a 1mol / L tin precursor solution to obtain a porous carbon-tin dioxide composite material.

[0044] The third step: heating and reacting the porous carbon-tin dioxide composite material with the glucose solution to obtain the precursor of the carbon-coated nanocomposite material.

[0045]Step 4: Seal the precursor prepared in the previous step in a metal can under a nitrogen atmosphere, and at the same time heat the tube furnace to 1000°C, and keep the furnace mouth of the tube furnace open. Use long-handled metal pliers to hold the metal can containing the precursor, and let it react briefly in a high-temperature tube furnace for 30 minutes, then qui...

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Abstract

The invention relates to a preparation method of a porous carbon-tin nanocomposite material for lithium battery cathode, and belongs to the technical field of inorganic nano materials. A matrix of porous carbon is immersed in a tin precursor solution, and then the matrix is calcined twice and subjected to in situ reduction to prepare the porous carbon-tin nanocomposite material. Compared with the prior art, the nanocomposite material prepared by the invention can be used in the field of cathode material for lithium ion batteries, and can obtain high capacity and good cycle performance.

Description

technical field [0001] The invention belongs to the technical field related to the preparation of inorganic nanomaterials, and in particular relates to a method for preparing a porous carbon-tin nanocomposite material for a negative electrode of a lithium battery. Background technique [0002] Lithium-ion batteries have become the first choice for various portable electronic products and vehicle power batteries due to their good performance and non-toxic environmental protection. With people's increasing demand for miniaturization and high power of electronic products, the research and development of high-capacity and lithium-ion batteries has become a topic of common concern in academia and industry. [0003] At present, graphite material, which is used as a negative electrode material for commercial lithium-ion batteries, has become the only commercial lithium-ion battery negative electrode material due to its low electrode potential, good cycle stability, and low cost. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1391B82Y40/00
CPCB82Y40/00H01M4/364H01M4/387H01M10/0525Y02E60/10
Inventor 朱申敏李尧张荻朱呈岭
Owner SHANGHAI JIAO TONG UNIV
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