Negative electrode active substance and production method therefor
A negative electrode active material and manufacturing method technology, applied in the direction of active material electrodes, electrode manufacturing, negative electrodes, etc., can solve the problems of reduced cycle characteristics, no consideration of structure, performance correlation, insufficient research on chemical bonds, etc., to achieve excellent charge and discharge The effect of the characteristic
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Synthetic example 1
[0147] (Synthesis Example 1: Synthesis of Condensate (m-1) of Methyltrimethoxysilane)
[0148] 1,421 parts by mass of methyltrimethoxysilane (hereinafter, abbreviated as "MTMS") was charged to a reaction container equipped with a stirrer, a thermometer, a dropping funnel, a cooling pipe, and a nitrogen gas inlet, and the temperature was raised to 60°C. Then, 0.17 parts by mass of isopropyl acid phosphate ("Phoslex A-3" manufactured by SC Organic Chemical Co., Ltd.) and 207 parts by mass were added dropwise to the reaction vessel in 5 minutes. Parts of the mixture of deionized water were stirred at 80° C. for 4 hours to carry out the hydrolysis and condensation reaction.
[0149] At a temperature of 40°C to 60°C and a reduced pressure of 40kPa to 1.3kPa (referring to the condition that the decompression condition is 40kPa when the methanol starts to be distilled and removed, and the final decompression reaches 1.3kPa. The same applies below) to the hydrolytic condensation The ...
Synthetic example 2
[0151] (Synthesis Example 2: Synthesis of polysiloxane compound (PS-1))
[0152] 150 parts by mass of isopropanol (hereinafter, abbreviated as "IPA") and 105 parts by mass of phenyltrimethoxysilane were charged into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, a cooling pipe, and a nitrogen gas inlet. (hereinafter, abbreviated as "PTMS") and 277 parts by mass of dimethyldimethoxysilane (hereinafter, abbreviated as "DMDMS"), and the temperature was raised to 80°C.
[0153] Then, spend 6 hours at the temperature to dropwise add 21 parts by mass of methyl methacrylate, 4 parts by mass of butyl methacrylate, 3 parts by mass of butyl acrylate, 2 parts by mass of A mixture of 3-methacryloxypropyltrimethoxysilane, 3 parts by mass of IPA and 0.6 parts by mass of tert-butyl peroxy-2-ethylhexanoate, after the dropwise addition, and then in The reaction was carried out at the temperature for 20 hours to obtain an organic solvent solution of a vinyl polyme...
Embodiment 1
[0162] Commercially available monomeric silicon powder (manufactured by High Purity Chemicals, with a purity of 99.9%, and an average particle diameter of 5 μm) was wet-milled in a methyl ethyl ketone (Methyl Ethyl Ketone, MEK) solvent to obtain an average particle diameter of 180 nm and a concentration of is a 17% by weight silicon (0 valence) suspension. PS-1 described in Synthesis Example 2 as a polysiloxane compound, phenol resin (IF3300, manufactured by DIC Co., Ltd.) as a carbon source resin, and the silicon (0-valent) obtained above The suspension was mixed at a composition ratio by weight of the solid content (nonvolatile matter) of each raw material (polysiloxane compound / carbon source resin / silicon (0 valence)=0.6 / 0.25 / 0.15), and uniformly stirred. In a nitrogen atmosphere, the dried precursor obtained by heating and drying was calcined at 1100° C. for 2 hours to obtain a black solid, which was pulverized by a planetary ball mill to produce a black powder active mate...
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