3results about How to "Solve capacity fading" patented technology

The present application relates to the technical field of battery negative electrode material, in particular to an irregular spherical porous carbon and a preparation method and application thereof, and a silicon-carbon composite material and a preparation method and application thereof. The present application emulsifies and compiles liquid phenolic resin under the condition of oil-soluble and water-soluble compound emulsifier, and crosslinks and solidifies, meanwhile, an ultrasonic auxiliary mode is adopted, under the joint action of ultrasonic disturbance and different interfacial tension, the shape of the obtained resin is changed, the spherical resin is adjusted to irregular spherical resin, after pyrolysis and gas activation, irregular porous spherical carbon is obtained. Compared with the spherical carbon, under the premise of maintaining the strength of the spherical carbon, the irregular spherical carbon can increase the contact area between the carbon particles and the binder, the carbon particles and the binder are not easy to separate, and the cycle stability of the battery (especially the lithium ion battery) is improved.

The invention discloses an acid-base amphoteric iron-sulfur hybrid flow battery and a preparation method thereof, belonging to the technical field of flow batteries. The flow battery comprises a positive electrode chamber and a negative electrode chamber, an intermediate chamber is arranged between the positive electrode chamber and the negative electrode chamber, an anion exchange membrane is arranged between the positive electrode chamber and the intermediate chamber, and a cation exchange membrane is arranged between the intermediate chamber and the negative electrode chamber; the positive electrode chamber comprises a positive electrode active material and a positive electrode electrolyte, the negative electrode chamber comprises a negative electrode active material and a negative electrode electrolyte; the intermediate chamber comprises an intermediate chamber electrolyte; the positive electrode redox couple of the iron-sulfur hybrid flow battery is Fe 3+ / Fe 2+ ; The negative electrode redox couple of the iron-sulfur hybrid flow battery is S 2 2‑ / S 4 2‑ The three-chamber design of the present invention can place the positive electrode electrolyte and the negative electrode electrolyte in an acid-base environment that is most conducive to the electrochemical reaction and chemical stability of the active material, thereby providing a high electrolyte concentration, a fast electrochemical reaction rate and a high electrolyte stability.

The invention provides a silicon negative electrode material, a preparation method of the silicon negative electrode material, a negative electrode plate, a preparation method of the negative electrode plate and an all-solid-state battery, the silicon negative electrode material comprises silicon particles and a coating layer, the surface of the silicon particles is coated with the coating layer, the coating layer is a polybiphenyl oxadiazole layer, and the coating layer is provided with a plurality of pores. By utilizing the silicon negative electrode material, the stress and volume change generated in the electrochemical cycle process of the silicon particles can be relieved, the problem of capacity fading caused by electrode crushing in the cycle of the silicon negative electrode is solved, and the service life of the battery is prolonged.