Battery negative electrode active material and preparation method thereof, battery negative electrode and secondary battery
A battery negative electrode and active material technology, applied in the direction of secondary batteries, active material electrodes, battery electrodes, etc., can solve the problems of low Coulombic efficiency, low ion and electronic conductivity, irreversible loss of lithium ions, etc., to achieve high energy density, good dynamic performance
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[0060] [Preparation method of negative electrode active material]
[0061] figure 1 For the preparation of the above negative electrode active material according to the present application, the above-described negative active material is prepared.
[0062] According to some embodiments, S301 is stepped to prepare silicon oxygen particles. The specific procedure for prepared can be carried out as follows.
[0063] First, in an inert gas atmosphere or decompression conditions, the mixture of the metal silicon powder and the silica powder is heated in a temperature range of 900 ° C to 1600 ° C, resulting in a silica gas, metal silicon powder, and silica powder. The molar ratio can be set in the range of 0.5 to 1.5. The gas produced by the raw material heating reaction is deposited on the adsorption plate. When the temperature of the reaction furnace is reduced to 100 ° C or lower, the deposit is taken, and the equipment such as a ball mill, a gas flow pulverizer is used for pulveriz...
Embodiment 1-1
[0086] Preparation of 1000 grams of medium value particle diameter of 5 microns and silicon oxygen ratio of 1: 1 is 1: 1.
[0087] The above silicone compound powder, metal lithium band, and biphenyl were added to a sealable glass container, and then methyl butyl ether was added and the reaction was stirred under an argon atmosphere. After the reaction was completed and dried, the resulting powder was placed under an argon atmosphere for heat treatment, and the temperature of the heating speed was raised to 850 ° C using 5 ° C per minute, and then held for 2 hours, and then naturally cooled, lithium doped silicon oxygen Compound powder. XRD map and SEM photos of this material such as Figure 4 and Figure 5 Indicated.
[0088] Using Cu-K α The line of X-ray diffraction obtained by the ray has Li in the range of 2θ = 18.78 ° ± 0.2 °. 2 SiO 3 The diffraction peak of the phase, the half-high and greater value = 0.34 of the diffraction peak, and the peak area of the diffraction peak i...
Embodiment 1-2
[0092] It is weighed with silicon oxygen particles having a median particle diameter of 5 microns and placed in a CVD furnace. The coating reaction was carbonate at 950 ° C for acetylene to obtain a silicone compound having a complete carbon film layer in which the thickness of the carbon film was 20 nm.
[0093] Next, a lithium metal doping is carried out by a thermal doping method. Specifically, the particles are mixed with a lithium-containing compound (such as lithium oxide, lithium hydride, lithium hydroxide, lithium carbonate, etc.), place the mixed powder at a argon atmosphere The heat treatment was carried out, and the temperature was warmed to 800 ° C for 3 hours using 3 ° C for 3 hours, and the lithium-containing silicon oxygen containing coated carbon film was obtained.
[0094] As shown in Table 1 below, A = 0.43, B / A = 4, C / D = 0.12, F / C = 0.4, the material does not contain Li 4 SiO 4 Phase diffraction peak.
[0095] In the present embodiment, the evaluation res...
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