Abstract: A battery electrode composition includes a population of jagged composite particles, in which each of the jagged composite particles includes silicon and carbon. In some embodiments, 90% or more of the jagged composite particles in the population are characterized by aspect ratios of 2.3 or less and 50% or more of the jagged composite particles in the population are characterized by aspect ratios of 1.25 or more. In some embodiments, the population is characterized by a particle size distribution (PSD) as determined by laser particle size distribution analysis (LPSA) and a fiftieth-percentile volume-weighted particle size parameter D50 of the PSD is in a range of about 2.0 to about 17.0 ?m.

Abstract: A polyimide material is obtained from a first monomer and a second monomer. The first monomer includes an es-ter-containing dianhydride. The second monomer includes a diamine. The polyimide material has desirable optical, structural, thermal, mechanical properties, or combination thereof.

Abstract: The present disclosure describes methods of polyimide synthesis and polyimides made therefore. The method includes placing a tetracarboxylic compound and a solvent in a reaction vessel and adding a first amount of a diamine. The first amount of the diamine is not more than 99.5 mol % of the tetracarboxylic compound inside the reaction vessel. The method can include agitating the mixture and determining a viscosity of the mixture. The method can further include adding a second amount of the diamine. The last steps can be repeated until the viscosity increases to a target value. The target viscosity can be correlated to a peak weight-averaged molecular weight of the polyimide.

Abstract: The present disclosure describes methods of polyimide synthesis and polyimides made therefore. The method includes placing a tetracarboxylic compound and a solvent in a reaction vessel and adding a first amount of a diamine. The first amount of the diamine is not more than 99.5 mol % of the tetracarboxylic compound inside the reaction vessel. The method can include agitating the mixture and determining a viscosity of the mixture. The method can further include adding a second amount of the diamine. The last steps can be repeated until the viscosity increases to a target value. The target viscosity can be correlated to a peak weight-averaged molecular weight of the polyimide.