Negative electrode active material, negative electrode comprising same negative electrode active material, and secondary battery comprising same negative electrode
A negative electrode active material, content technology, applied in the direction of secondary batteries, active material electrodes, negative electrodes, etc., can solve the side reaction between silicon particles and electrolyte, battery life and stability have not been effectively improved, and it is not easy to control volume expansion etc. to achieve the effect of improving discharge capacity and initial efficiency
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[0056] A method for preparing a negative electrode active material according to another embodiment of the present invention may include the steps of: preparing a silicon core having a silicon core containing SiO disposed on its surface x (0
[0057] In the preparation has disposed on its surface containing SiO x (0
[0058] When forming a coating layer containing LiF on an oxide layer to form a plurality of nanoparticles, the coating layer may be formed by the following method.
[0059] The coating can be formed by a method in which a silicon core having ...
Embodiment 1
[0083] Embodiment 1: the preparation of battery
[0084] (1) Preparation of negative electrode active material
[0085] The 4.1g maximum particle size (D max ) of 45 μm and 0.08 g of LiF were added to 30 g of isopropanol to prepare a mixed solution. After that, the mixture was pulverized using beads made of zirconia (average particle diameter: 0.3 mm) at a bead rotation speed of 1,200 rpm for 30 hours. At this time, the average particle size (D 50 ) of 100nm, formed on the surface of silicon SiO 2 The thickness is 10nm, and set in SiO 2 The thickness of the LiF on is 0.1nm to 10nm.
[0086] Subsequently, 20g average particle size (D 50 ) of 15 μm and spherical natural graphite of 0.8 and 3.3 g of solid-phase pitch were added to the mixed solution and dispersed to prepare a slurry.
[0087]The slurry and ethanol / water (volume ratio=1:9) were mixed at a volume ratio of 1:10 to prepare a dispersion for spray drying. The dispersion was spray dried by a mini spray dryer (ma...
Embodiment 2
[0092] Embodiment 2: the preparation of battery
[0093] (1) Preparation of negative electrode active material
[0094] The 4.1g maximum particle size (D max ) of 45 μm and 2.05 g of LiF were added to 30 g of isopropanol to prepare a mixed solution. After that, the mixture was pulverized using beads made of zirconia (average particle diameter: 0.3 mm) at a bead rotation speed of 1200 rpm for 30 hours. At this time, the average particle size (D 50 ) of 100nm, formed on the surface of silicon SiO 2 The thickness is 10nm, and set in SiO 2 The thickness of the LiF on is 0.1nm to 30nm.
[0095] Subsequently, 20g average particle size (D 50 ) of 15 μm and spherical natural graphite of 0.8 and 3.3 g of solid-phase pitch were added to the mixed solution and dispersed to prepare a slurry.
[0096] The slurry and ethanol / water (volume ratio=1:9) were mixed at a volume ratio of 1:10 to prepare a dispersion for spray drying. The dispersion was spray dried by a mini spray dryer (ma...
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