Method for producing negative electrode material for lithium ion batteries
A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of lithium batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., and can solve problems such as inability to obtain capacity, large expansion rate and shrinkage rate, and short charge-discharge cycle life of lithium-ion batteries. , to achieve the effect of excellent charge-discharge cycle characteristics and large charge-discharge capacity
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Embodiment 1
[0167](Preparation of Granules (A))
[0168] Si particles (primary particle diameter: 100 nm) were prepared. 100 mL of toluene and 0.2 g of 3-aminopropyltriethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., LS-3150) as a silane coupling agent were placed in an eggplant-shaped bottle, and ultrasonic waves were applied and stirred. 2 g of Si particles were added thereto, and ultrasonic waves were irradiated for 10 minutes. Thereafter, the eggplant-shaped bottle was set in a reflux condenser and refluxed at 135° C. for 1 hour to introduce amino groups to the Si surface. The surface-treated Si particles were referred to as particles (A-1).
[0169] (Preparation of Carbon Particles (B))
[0170] Petroleum coke was pulverized to an average particle size of 5 μm. It was heat-treated in an Acheson furnace at 3000°C to obtain a BET specific surface area of 3.2m 2 / g,d 002 0.3363nm, L C 61nm, 10% particle size (D10) is 2.5 μm, 50% particle size (D50) is 5.1 μm, 90% par...
Embodiment 2
[0177] A negative electrode material was obtained by the same method as in Example 1 except that the concentration of the sulfuric acidic potassium permanganate solution was changed to 2.5% by mass. According to the observation based on SEM-EDX, Si particles must exist where carbon particles exist, and Si particles do not exist where carbon particles do not exist.
[0178] Using this negative electrode material, a lithium ion battery for evaluation was fabricated, and the charge and discharge characteristics were measured. The results are shown in Table 1.
Embodiment 3
[0180] A negative electrode material was obtained in the same manner as in Example 1 except that the concentration of the sulfuric acid acidic potassium permanganate solution was changed to 1.1% by mass. According to the observation based on SEM-EDX, Si particles must exist where carbon particles exist, and Si particles do not exist where carbon particles do not exist.
[0181] Using this negative electrode material, a lithium ion battery for evaluation was fabricated, and the charge and discharge characteristics were measured. The results are shown in Table 1.
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