Multilayer Si/Graphene Composite Anode Structure
A composite material, anode structure technology, applied in structural parts, electrode manufacturing, battery electrodes, etc., can solve the problems of not considering the weight of carbon materials, low electric capacity, etc.
Active Publication Date: 2014-12-31
黄炳照
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[0003]In the same year, Zhang et al. (Electrochem. Commun. 2012, 23, 17) used electrophoretic deposition (EPD) and radio frequency magnetic Controlled sputtering (RF magnetron sputter), sequentially prepared carbon / graphene multilayer film composite material as the anode of the battery, and carried out charge and discharge tests at a current density of 840 mA / g, and its first cycle discharge capacity can reach 3150 mAh / g, but the gram capacitance calculated by the research institute does not take into account the weight of carbon materials, so the actual capacitance is much lower than this value
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[0026] Using electron beam evaporation technology, several layers of silicon / graphene composite anode materials are continuously deposited on the surface of the copper foil current collector, while the pressure of the deposition chamber is maintained at 4-10 Pa, and the temperature of the substrate is controlled at 150-250°C , and the plating rates of graphene film and silicon film are fixed at about 1000 nm / h and 500 nm / h, respectively. In the preparation step, a graphene film is first deposited on the surface of the copper foil current collector, followed by alternate deposition of silicon, graphene, silicon, and graphene in the order, and the last film is fixed as a graphene film. The electrochemical test of this material is to assemble it with lithium metal into a coin cell, using lithium hexafluorophosphate (lithium hexafluorophosphate; LiPF 6 ) was dissolved in ethylene carbonate (EC) and dimethyl carbonate (DMC) as the electrolyte, and the charge-discharge test was perf...
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Abstract
The present invention discloses a high electrochemical performance silicon / graphene composite anode structure. The electrochemical properties of silicon in the composite anode structure can be improved by graphene thin films. The thickness of the silicon thin film and the graphene thin films is less than 50 nm to prevent the composite anode structure from any volumetric change during the charge / discharge process. The manufacturing procedure starts with the formation of a Si / graphene unit layer, which includes an amorphous phase upper silicon thin film and a lower graphene thin film, on a copper foil current collector, so as to decrease the difference of conductivity between the silicon thin film and the copper foil current collector. Finally, the deposition is concluded with the formation of a graphene thin film on the topmost surface of the silicon thin film to prevent the surface of the anode structure from oxidation.
Description
technical field [0001] The invention discloses a multilayer film silicon / graphene composite material anode structure with high electrochemical characteristics. Background technique [0002] In 2012, Ji et al. (Nano Energy 2012, 1, 164) formed a thin film of a graphene solution through suction filtration, and transferred it to a copper foil current collector. Enhanced chemical vapor deposition (plasma-enhanced chemical vapor deposition; PECVD) forms a silicon thin film. Repeating this process several times can successfully prepare a silicon / graphene multilayer film composite material as the anode of the battery. Five layers of silicon / graphene The structural sample has the best electrochemical properties. However, the charge-discharge test was performed at a current density of 50 mA / g. The discharge capacity of the five-layer silicon / graphene structure sample in the 30th cycle declined to 59.5% of the 1st cycle. [0003] In the same year, Zhang et al. (Electrochem. Commun. 2...
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Patent Timeline
Login to View More IPC IPC(8): H01M4/133H01M4/134
CPCH01M4/0423H01M4/366H01M4/386H01M4/583H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/661H01M10/0525Y02E60/10
Inventor 森达宏陈致融洪太峰穆罕默德·沙德刘如熹胡淑芬林弘正林逸樵宋健民黄炳照
Owner 黄炳照