Anode material of lithium-ion battery and method for preparing anode material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low cycle times of amorphous silicon-based films, easy blocking of lithium ion migration channels, and poor conductivity of silicon nanowires. Achieving the effect of improved Coulombic efficiency, improved battery cycle performance, and increased concentration of conductive holes or electrons

Inactive Publication Date: 2012-07-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] However, these methods all lead to the decline of lithium battery performance due to the constraints of various factors.
For example, the number of cycles of amorphous silicon-based thin films is low under large capacity; the porous silicon structure will collapse after many cycles, and the small cavities will disappear; the conductivity of silicon nanowires is poor and the migration channels of lithium ions are easily blocked; silicon-based composite materials Si nanoparticles are easy to agglomerate and other problems

Method used

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  • Anode material of lithium-ion battery and method for preparing anode material
  • Anode material of lithium-ion battery and method for preparing anode material
  • Anode material of lithium-ion battery and method for preparing anode material

Examples

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Embodiment 1

[0040] The method for preparing lithium-ion battery negative electrode material in this embodiment mainly includes the following steps:

[0041] Step 1: Take recycled P-type high-doped solar-grade crystalline silicon scraps as electrode materials, and use the SZ-82 digital four-probe tester of Suzhou Telecom Instrument Factory to measure the resistivity to 7.1Ω·cm.

[0042] Step 2: After washing, drying and crushing P-type crystalline silicon into small particles of about 1 mm, use a star ball mill for 8 hours to obtain silicon microcrystals with a median diameter of 3.364 μm. The particle size distribution diagram is shown in figure 1 .

[0043] Step 3: Measure the XRD of the powder obtained in step 2 to obtain figure 2 , indicating that the main component of the silicon active material is crystalline silicon.

[0044] Step 4: Mix the above-mentioned doped crystalline silicon active powder with a mass fraction of 75%, 15% PVDF (polyvinylidene fluoride) and 10% acetylene bl...

Embodiment 2

[0047] The method for preparing lithium-ion battery negative electrode material in this embodiment mainly includes the following steps:

[0048] Step 1: Produce bulk solar-grade polysilicon by the improved Siemens method (closed-loop trichlorosilane hydrogen reduction method).

[0049] Step 2: adding a master alloy containing B element to the above silicon material, doping and casting an ingot under the conditions of vacuum and high temperature 1350-1500° C. to obtain a P-type crystalline silicon active material with a resistivity of 5.1Ω·cm.

[0050] Step 3: Wash, dry, and pulverize the P-type crystalline silicon obtained in Step 2 into small particles of about 1 mm, and then ball mill it with a star ball mill for 10 hours. The median diameter of the silicon crystal is 2.904 μm.

[0051] Step 4: Mix the doped crystalline silicon active powder obtained in step 3 with a mass fraction of 60%, 20% PVDF (polyvinylidene fluoride) and 20% acetylene black, and drop an appropriate amo...

Embodiment 3

[0054] The difference from Example 2 is that the doping of B is changed to doping of P. The obtained sample is marked as A3, and its capacity cycle performance is shown in Table 1.

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Abstract

The invention discloses an anode material of a lithium-ion battery and a method for preparing the anode material, belongs to the technical field of the lithium-ion batteries, and aims to solve the problems of poor volume effect caused in the electrochemical lithium de-insertion process of a high-capacity silicon anode material of the lithium-ion battery and low electric conductivity of the material. The anode material of the lithium-ion battery is high in coulombic efficiency and high in cycle performance. The anode material of the lithium-ion battery is formed by adding a carbon element and an adhesive into N-type or P-type doped crystalline silicon active powder which serves as a main material and then laminating a mixture. By adoption of the anode material of the lithium-ion battery, high capacity can be realized, and the electric contact performance of a microcrystal active lithium insertion center can be improved, so that the volume of a silicon micro crystal is slightly changed, the cycle stability is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to negative electrode materials and preparation methods of lithium ion batteries. technical background [0002] With the rising oil price and the requirements of environmental protection and energy saving, hybrid electric vehicles and electric vehicles have received more and more close attention. Lithium-ion batteries are one of the most potential power sources due to their inherent characteristics, such as high open circuit voltage, no memory effect, high specific energy, high specific power, long life, and low cost. [1] . ([1] M. Armand, J. M. Tarascon, Nature 2008, 451:652-657). The advancement of material technology is the basis for the development of the lithium-ion battery industry. The existing commercial anode materials are difficult to meet the special needs of the growing power supply. Therefore, it is urgent to develop new high-capacity electrode materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/134H01M4/1395
CPCY02E60/122Y02E60/10
Inventor 薛卫东李昱树唐瑛材
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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