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Preparation method of SiO2@C core-shell compound physical lithium ion battery cathode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrochemical properties of electrode materials, complicated operation process, and non-environmental protection, and achieve excellent rate performance, environmental friendliness, low cost effect

Inactive Publication Date: 2017-06-13
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, the existing problems in the prior art are: the prior art fails to directly use the nano-silica particles with uniform size in the rice husk as the anode material of the high-capacity lithium-ion battery, and the whole operation process is complicated and the cost is high. Not environmentally friendly, poor electrochemical properties of electrode materials

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  • Preparation method of SiO2@C core-shell compound physical lithium ion battery cathode material
  • Preparation method of SiO2@C core-shell compound physical lithium ion battery cathode material
  • Preparation method of SiO2@C core-shell compound physical lithium ion battery cathode material

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preparation example Construction

[0026] Such as figure 1 As shown, the SiO provided by the embodiment of the present invention 2 The preparation method of @C core-shell composite lithium ion battery negative electrode material specifically comprises the following steps:

[0027] S101: Wash the rice husk with deionized water, and then treat it at 450° C. to 550° C. for 1 h to 2 h under nitrogen atmosphere to obtain a dry distillate of rice husk; pickle with a hydrochloric acid solution with pH=3 to 4, and then use Wash with deionized water until neutral, dry in an oven at 100°C for 12h to 24h, then cool naturally to room temperature to obtain SiO 2 Mix with C.

[0028] SiO after pickling obtained in S102:S101 2 Mixed with C in a silicon nitride tank, high energy ball milling with silicon nitride balls under different conditions to obtain SiO 2 @C core-shell composite lithium-ion battery anode material.

[0029] In said S101, the rice husk is washed with deionized water to remove the alkali metal oxide imp...

Embodiment 1

[0035] Wash the rice husk with deionized water, calcined at 500°C for 1h under the protection of nitrogen atmosphere, then use 1.0mol / L hydrochloric acid solution, acid boil at 100°C for 2h, wash with deionized water until neutral, dry and cool naturally to room temperature to obtain SiO after pickling 2 / C mixture; according to the mass ratio of ball to material 10 / 1, the mixture is placed in a silicon nitride tank, the ball milling speed is set to 800rpm, the ball milling time is 12h, and silicon nitride balls are used for high energy ball milling to obtain the electrode material SiO 2 @C-12 core-shell complex.

[0036] Prepared SiO 2 SEM image of @C core-shell complex, such as figure 2 shown.

[0037] The active electrode material (SiO 2 @C core-shell composite 80%), conductive agent (acetylene black 10%), and binder (PVDF10%) are evenly mixed, mixed and ground into a slurry using solvent NMP, and evenly coated on the current collector copper foil , after drying in a ...

Embodiment 2

[0040] Prepare the sample according to the method described in Example 1, the difference is that the high-energy ball milling step is not carried out, that is, the ball milling time is 0h, and the obtained electrode material is SiO after pickling 2 / C mixtures such as image 3 Its SEM image.

[0041] The battery is assembled according to the method of Example 1, and the battery is measured at a current density of 100mA / g, the first discharge specific capacity is 631mAh / g, and the specific capacity after 100 cycles is 462mAh / g, and the cycle performance is as follows: Figure 5 shown.

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Abstract

The invention belongs to the technical field of battery cathode material preparation and discloses a SiO2@C core-shell compound physical lithium ion battery cathode material and a preparation method thereof. The preparation method includes: using rice husks as the raw materials, crushing carbon blocks of carbonized rice husks through a high-energy ball milling method by utilizing the features of the organic carbon of the rice husks and SiO2 and the template structure naturally formed between the organic carbon of the rice husks and the SiO2, and dispersing agglomerated SiO2 nano particles; evenly wrapping the surfaces of the dispersed SiO2 nano particles with the crushed carbon powder to finally form a SiO2@C core-shell compound with an interconnected network structure. The SiO2 in the SiO2@C core-shell compound is evenly wrapped with C, the SiO2 and the C infiltrate each other to form the interconnected network structure, and the structural integrity is beneficial to charge diffusion and fast ion transportation. The SiO2@C core-shell compound physical lithium ion battery cathode material is low in cost and excellent in electrochemical performance, and the preparation method is hopefully applicable to large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of battery negative electrode materials, in particular to a SiO 2 Preparation method of @C core-shell composite lithium-ion battery anode material. Background technique [0002] With the development and popularization of portable electronic devices such as notebook computers, mobile phones, and digital cameras, and the development and application of electric vehicles, the demand and performance requirements for chemical power sources have increased dramatically. Compared with traditional nickel-hydrogen batteries and nickel-cadmium batteries, lithium-ion batteries have become the most advanced batteries so far because of their advantages such as high energy density, high and stable discharge voltage, small self-discharge, good cycle performance, good safety performance, and environmental friendliness. A promising secondary battery. [0003] For lithium-ion battery anode materials, traditiona...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M10/0525
CPCH01M4/366H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 王晓峰丰祎刘丽
Owner JILIN UNIV
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