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Lithium ion battery negative electrode composite film material and preparation method thereof

A lithium-ion battery and composite thin film technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that hinder the development of industrialization, high irreversible capacity, and poor cycle stability, and achieve a good collector contact interface and high magnification , good stability

Active Publication Date: 2016-01-06
徐州新南湖科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its high capacity tends to decay rapidly during cycling. To address this problem, researchers have taken a series of measures to improve the size and structure of the material, such as nano-izing or coating the material. However, There are still bottleneck problems in tin oxide anode materials: high irreversible capacity for the first time and poor cycle stability, which are also the main factors hindering its development to industrialization

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: Soak the copper foil cleaned by ultrasonic waves in acetic acid for 3 hours to remove surface oxides, and move into ceramic targets containing ZnO and SnO 2 On the substrate base of the vacuum chamber of the radio frequency magnetron sputtering equipment, vacuumize to a pressure of 5×10 -4 Pa, feed argon as the sputtering gas, adjust the gas flow to 20sccm, adjust the working pressure to 0.75Pa, carry out the sputtering deposition of the ZnO intermediate layer, the sputtering power is 40W, the deposition time is 5min, and then rotate the substrate base to SnO 2 target site, for SnO 2 Thin film deposition, the electron beam current is 80mA, the deposition time is 20min, and the ZnO / SnO prepared on the copper current collector substrate is obtained. 2 Composite films such as figure 1 is the surface microstructure morphology of Cu foil. Cut the obtained composite film into 0.8×0.8cm 2 The electrode sheet to LiPF 6 As the electrolyte, the lithium sheet is u...

Embodiment 2

[0028] Embodiment 2: Put the ultrasonically cleaned copper foil into dilute hydrochloric acid and soak for 5 minutes to remove surface oxides, move it into the vacuum chamber substrate base of the radio frequency magnetron sputtering equipment with ceramic target ZnO, and evacuate to pressure 5×10 -4 Pa, feed argon as the sputtering gas, adjust the gas flow rate to 20sccm, adjust the working pressure to 0.75Pa, carry out the sputtering deposition of the ZnO interlayer, the sputtering power is 40W, the deposition temperature is 300 ° C, the deposition time is 5min, and then After cooling to room temperature, take it out and move it into the deposition chamber of the electron beam evaporator for evaporation of SnO 2 Thin film, the adjustment voltage is 6kV, the electron beam current is 150mA, and the room temperature is deposited for 30min to obtain the ZnO / SnO prepared on the copper current collector substrate. 2 composite film, figure 2 ZnO, glass / ZnO deposited by sputterin...

Embodiment 3

[0029] Example 3: Soak the ultrasonically cleaned copper foil in dilute hydrochloric acid for 5 minutes to remove surface oxides, and move into metal-containing copper targets, ceramic targets ZnO and SnO 2 On the substrate base of the vacuum chamber of the DC / RF magnetron sputtering equipment, vacuumize to a pressure of 5×10 -4 Pa, feed argon as the sputtering gas, adjust the gas flow rate to 20sccm, adjust the working pressure to 1.5Pa, firstly carry out the sputtering of the copper film buffer layer, the sputtering time is 3 minutes, and then carry out the sputtering deposition of the ZnO intermediate layer , the sputtering power was 40W, the deposition time was 5min, and then the substrate pedestal was rotated to the SnO 2 target site, for SnO 2 Thin film deposition, the sputtering power is 80W, the deposition time is 20min, and the Cu / ZnO / SnO prepared on the copper current collector substrate is obtained 2 Composite film. Cut the obtained composite film into 0.8×0.8cm ...

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Abstract

The invention discloses a lithium ion battery negative electrode composite film material and a preparation method thereof. The negative electrode thin film is a ZnO / SnO2 composite film. Current collector copper foil or copper foil where a metal copper film is deposited is used as a substrate. Firstly, the substrate is soaked with weak acid to remove surface oxide, and then the substrate is placed into a vacuum cavity of vacuum coating equipment for ZnO transition layer film deposition and SnO2 active layer film deposition to obtain the final ZnO / SnO2 composite film. The obtained film is used as the lithium ion battery negative electrode material to form a lithium ion battery, an electrochemical test shows that the ZnO / SnO2 composite film makes better interface contact with a current collector compared with a SnO2 film, and the active film with no transition layer ZnO is more likely to be disengaged from the current collector and loses efficiency in the charging and discharging process compared with the SnO2 film. The lithium ion battery with the ZnO / SnO2 composite film as the negative electrode is high in first-discharging specific capacity, good in stability and high in rate performance.

Description

technical field [0001] The invention belongs to the technical field of thin-film lithium-ion batteries, and in particular relates to a negative-electrode thin-film of lithium-ion batteries and a preparation method thereof. Background technique [0002] With the increasing consumption and exhaustion of conventional energy sources, the development and utilization of new clean energy sources will inevitably involve energy storage and conversion, which promotes the development of chemical energy storage power sources. Starting from small electronic products, it expands to power batteries for electric vehicles and energy storage devices for energy such as wind energy and solar energy. However, the current commercial application of lithium-ion battery anode carbon materials is basically close to its theoretical capacity limit (372mAh / g), which is not conducive to the development of large-capacity, high-speed, long-life chemical energy storage power supplies. In order to meet the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M10/0525
CPCH01M4/362H01M4/483H01M10/0525Y02E60/10
Inventor 黄延伟王洪波孔哲
Owner 徐州新南湖科技有限公司
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