Method for preparing silicon-carbon anode material for lithium ion battery
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A carbon negative electrode material, lithium-ion battery technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as lack of conductivity, large volume effect, and poor cycle performance. Achieve the effect of low cost, simple operation and improved conductivity
Active Publication Date: 2018-09-18
NORTHEASTERN UNIV
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Problems solved by technology
However, silicon has a large volume effect in the process of lithium intercalation and desorption during charge and discharge, which causes it to be stripped from the conductive medium current collector, resulting in poor cycle performance and low Coulombic efficiency.
In addition, silicon itself does not have good conductivity
Method used
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Embodiment 1
[0057] A method for preparing a silicon-carbon negative electrode material for a lithium-ion battery is carried out in the following steps:
[0058] Step 1: Preparation of sucrose-coated silica
[0059] (1) Dissolve 19.2g of sucrose in deionized water completely to obtain an aqueous solution of sucrose; add 12g of nano-silica powder to the aqueous solution of sucrose, fully stir to make it evenly dispersed in the entire system, and mix uniformly to obtain an aqueous solution of silicon dioxide and sucrose ;
[0060] Wherein, the average particle size of the nano silicon dioxide powder is 30-500nm, and the purity is 99.5wt.%.
[0061] The sucrose is edible sucrose with a purity of 97wt.%.
[0062] (2) Heating the aqueous silica sucrose solution to 70°C, evaporating the solution to dryness, putting the obtained solid in a vacuum drying oven at 60°C and 10 Pa, and drying it sufficiently to obtain a sucrose-coated silica sample;
[0063] Step 2: Preparation of carbon-coated sil...
Embodiment 2
[0076] A method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, the same as in Example 1, the difference is that:
[0077] (1) During the electrolysis process in step 4, the applied voltage is 1.7±0.1V;
[0078] Other methods are the same.
Embodiment 3
[0080] A method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, the same as in Example 1, the difference is that:
[0081] (1) During the electrolysis process in step 4, the applied voltage is 1.8±0.1V;
[0082] Other methods are the same.
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Abstract
A method for preparing a silicon-carbon anode material for a lithium ion battery belongs to the field of lithium ion batteries. The method comprises the following steps of: 1) adding SiO2 powder to anaqueous solution of sucrose for stirring and mixing, evaporating the solution to dryness, and drying the solid; 2) grinding the sucrose coated with SiO2, heating to 300-1100 degrees centigrade for sucrose cracking, and then grinding, tableting, and sintering; 3) wrapping the obtained carbon-coated SiO2 tablet with foamed nickel, attaching the fine molybdenum wire to the metal molybdenum wire as acathode, connecting the graphite rod and the stainless steel wire as an anode, and regarding the silver-silver chloride electrode as a reference electrode; 4) after heating CaCl2 to melt, inserting the cathode, the anode and the reference electrode into the molten salt, applying a voltage of 1.5 to 3.0V between the cathode and the anode, electrolyzing the constant cell pressure for 10 to 15 hours, taking the cathode after electrolysis out from the molten salt for cooling, cleaning and drying, so as to obtain a silicon-carbon anode material for a lithium ion battery. The method may be made into a silicon-carbon anode material for a lithium ion battery with excellent performance, and is environmentally friendly, low in cost and simple in operation.
Description
technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing silicon-carbon negative electrode materials for lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long service life, and no memory effect. They have become the most widely used secondary batteries and still have broad development space. The positive and negative electrode materials of lithium-ion batteries are the key materials that determine their performance. The current commercial lithium-ion battery anode material is mesocarbon microspheres (MCMB), which are made of carbon-based material graphite, and its theoretical capacity is low (372mAh / g). The theoretical capacity of silicon is as high as 4200mAh / g, the discharge voltage is low, and the safety performance is good. These advantages make silicon expected to replace carbon as the negative electrode material of the next generatio...
Claims
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