Negative electrode active material for lithium secondary battery, preparation method thereof, and lithium secondary battery comprising said negative electrode active material
A negative electrode active material, silicon oxide technology, applied in secondary batteries, battery electrodes, electrode manufacturing, etc., can solve the problems of cycle characteristics deterioration, alloy structure damage, charge and discharge capacity reduction, etc., to improve battery performance, improve Electrical conductivity, increase the effect of physical contact
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Embodiment 1
[0062] SiO (average particle size 4 μm to 7 μm) was added to Fe(NO 3 )·6H 2 O middle. Subsequently, the mixture thus obtained was dried and then heat-treated to disperse the Fe catalyst on the surface of the silicon oxide particles.
[0063] Silicon oxide particles with Fe catalyst dispersed on their surfaces were placed in a chemical vapor deposition (CVD) chamber and then a composite was obtained by growing carbon nanometers on the silicon oxide particles while supplying argon (Ar) gas for five minutes. fibers, and then provide a predetermined amount of ethylene (C 2 h 4 )gas.
[0064] The amount of the grown carbon nanofibers was about 5 parts by weight based on 100 parts by weight of silicon oxide particles. It was observed that the as-prepared carbon nanofibers were inhomogeneous and had diameters ranging from 20 nm to 200 nm.
[0065] In order to remove the Fe catalyst impregnated in the composite thus prepared, the composite was immersed in a 10% hydrochloric acid...
Embodiment 2
[0070] The negative electrode active material prepared in embodiment 1, the styrene-butadiene rubber (SBR) as binding agent, the carboxymethyl cellulose (CMC) as thickener and the acetylene black as conductive agent are in weight ratio 95:2:2:1 mixed, and the mixture thus obtained was mixed with water (H 2 O) Mixing to prepare a homogeneous negative electrode slurry. One surface of the copper current collector was coated with the prepared negative electrode slurry to a thickness of 65 μm, dried and rolled. An anode was then prepared by punching into a predetermined size.
[0071] Ethylene carbonate (EC) and diethyl carbonate (DEC) were mixed at a volume ratio of 30:70, and LiPF 6 Added to the thus-prepared non-aqueous electrolyte solvent to prepare 1M LiPF 6 non-aqueous electrolyte.
[0072] In addition, a lithium foil was used as a counter electrode, that is, a positive electrode, a polyolefin separator was disposed between the two electrodes, and a coin-type lithium seco...
experiment example 1
[0076]
[0077] The surface of the negative electrode of the lithium secondary battery of Comparative Example 2 in which the negative electrode active material prepared in Comparative Example 1 was used was recognized by an SEM image, and the results are shown in figure 2 middle. figure 2 (a) and 2(b) are SEM images under high and low magnification, respectively.
[0078] Such as figure 2 As shown in , in the case where the carbon coating is not formed on the surface of the silicon oxide particles and the carbon nanofibers grown on the silicon oxide particles as in Comparative Example 2, it can be confirmed that the carbon nanofibers hardly remain , because the carbon nanofibers are detached from the silicon oxide particles.
[0079] That is, in the case of using the anode active material of Comparative Example 1, it can be understood that the fiber-type carbon is detached from the silicon oxide particles during preparation of the anode slurry or operation of the batter...
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Abstract
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