Negative active material for rechargeable lithium battery and rechargeable lithium battery including same
A negative electrode active material, lithium battery technology, applied in the direction of active material electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as electrode deterioration
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[0039] According to one embodiment, the ribbon-shaped structure can be milled with a ball mill for about 1 minute to about 200 hours using a dry method to prepare a negative electrode active material including about 20 atomic % or less oxygen, based on atoms in the negative electrode active material total. According to another embodiment, the structure can be wet-milled using a ball mill for about 1 minute to about 40 hours to prepare a negative active material comprising about 20 atomic % or less of oxygen, based on the total number of atoms in the negative active material . According to yet another embodiment, the structure can be milled dry or wet or a combination thereof using a paint shaker for about 1 minute to about 2 hours to prepare a negative active material comprising about 20 atomic percent or less oxygen, based on the The total number of atoms in the negative electrode active material. According to yet another embodiment, the structure can be milled dry or wet o...
Embodiment 1
[0095] A 12 μm thick and 1 mm wide ribbon-shaped structure including 68.9 wt % Si—Ti—Ni based alloy and 31.1 wt % Si was prepared by a melting and spinning method. A negative active material was then prepared by grinding the structure using a ball mill. The ball mill was Wisemix manufactured by Wisd.
[0096] First, the 12 μm thick and 1 mm wide ribbon-shaped structure comprising 68.9 wt% Si-Ti-Ni-based alloy and 31.1 wt% Si and zirconia balls with a diameter of 5 mm were placed in a mill at a weight ratio of 50:1. in the container. The ribbon-shaped structures and zirconia balls were filled up to about halfway of the grinding vessel.
[0097] Next, the grinding container was rotated at a speed of 100 rpm for 24 hours to grind the strip-shaped structure by a dry grinding method to prepare a negative electrode active material.
[0098] The negative active material includes 3.33 atomic % of oxygen atoms relative to the total number of atoms in the negative active material. T...
Embodiment 2
[0100] A negative electrode active material was prepared in a similar manner to Example 1, except that grinding was performed for 104 hours.
[0101] The negative active material includes 8.39 atomic % of oxygen atoms relative to the total number of atoms in the negative active material. The negative electrode active material has an average particle diameter (D50) of 3.446 μm and a particle size of 4.6185 μm 2 / g specific surface area.
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