Patent ID: 11876224
Assignee: DIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC H

Claim 0:
1. A negative electrode active material comprising: a silicon-based inorganic compound (a) composed of silicon (excluding zerovalent silicon), oxygen, and carbon; and silicon (zerovalent) (b),
wherein, in a 29Si solid NMR spectrum of the silicon-based inorganic compound (a), a plurality of peaks are present in a chemical shift range of +20 ppm to −150 ppm, and an equivalent constituent ratio [Q units/(D units+T units+Q units)] as determined from the 29Si solid NMR spectrum indicating a chemical bonding state (D units [SiO2C2], T units [SiO3C], Q units [SiO4]) of the silicon (excluding zerovalent silicon) is within a range of from 0.30 to 0.80 inclusive,
and wherein the negative electrode active material is produced by the following steps:
step 1-1 of obtaining a suspension of zerovalent silicon by adding fine metallic silicon particles or pulverized fine metallic silicon particles into an organic solvent;
step 1-2 of obtaining a precursor (c) by mixing and dispersing at least a polysiloxane compound, a resin containing an aromatic hydrocarbon moiety, and the suspension of zerovalent silicon obtained in step 1-1 and then drying the mixture, wherein an amount of the zerovalent silicon in terms of solids is set to 3 to 50% by mass relative to a weight of the precursor (c), an amount of the polysiloxane compound in terms of solids is set to 15 to 85% by mass relative to the weight of the precursor (c), and an amount of the resin containing an aromatic hydrocarbon moiety in terms of solids is set to 3 to 70% by mass relative to the weight of the precursor (c), and
step 2 of obtaining a fired product (d) by firing the precursor (c) obtained in step 1-2 in an inert atmosphere at a maximum firing temperature in a temperature range of from 900° C. to 1200° C. inclusive.