513results about How to "Alleviate volume changes" patented technology

The invention provides a three-dimensional porous current collector serving as a metal secondary battery anode current collector; the current collector is a three-dimensional porous hollow carbon fiber current collector having both hollow fiber tubular structure and porous structure. Compared with the traditional flat current collectors, the three-dimensional porous hollow carbon fiber current collector is capable of inhibiting dendritic crystal that occurs during metal deposition / separation, the safety of a metal anode is improved greatly, improved coulombic efficiency and longer cycle life can be achieved, and voltage polarization can be decreased. A method to prepare the three-dimensional porous hollow carbon fiber bobbin current collector is simple and easy, the raw materials are low in price and easy to obtain, and the collector is suitable for large-scale production and has high practical value.

A Si—C—O composite powder is obtained by curing a reactive silane or siloxane having crosslinkable groups through heat curing or catalytic reaction into a crosslinked product and sintering the crosslinked product in an inert gas stream at a temperature of 700-1,400° C. into an inorganic state. It exhibits satisfactory cycle performance when used as the negative electrode material for non-aqueous electrolyte secondary cells.

This invention provides a negative electrode material for a rechargeable battery with a nonaqueous electrolyte, characterized in that the negative electrode material contains polycrystalline silicon particles as an active material, the particle diameter of crystallites of the polycrystalline silicon is not less than 20 nm and not more than 100 nm in terms of a crystallite size determined by the Scherrer method from the full width at half maximum of a diffraction line attributable to Si (111) around 2θ=28.4° in an x-ray diffraction pattern analysis, and the true specific gravity of the silicon particles is 2.300 to 2.320.

The invention discloses an antimony sulfide based composite material of a sodium-ion battery and a preparation method of the antimony sulfide based composite material. The preparation method comprises the following steps of dissolving antimony sulfide in a medium, adding a graphene oxide solution, enabling the graphene oxide solution to be fully and uniformly dispersed with ultrasound for 1-600 minutes, mixing the graphene oxide solution, sulfite and an acid solution, stirring the mixed solution for 5-600 minutes, carrying out solid-liquid separation and drying to obtain a precursor of an amorphous antimony sulfide and graphene oxide composite material, and roasting the precursor for 1-24 hours at 250-550 DEG C under an inertia or reduction atmosphere to obtain the antimony sulfide based composite material of the sodium-ion battery. The composite material prepared according to the method can be used for a negative electrode material of the sodium ion battery, the specific capacity reaches 680mAh g<-1> when the current density is 2Ag<-1>, and the specific capacity retention rate is over 96% after circulation of 100 times. Compared with a traditional hydrothermal method, the preparation method has the advantages of short flow, simplicity in process, relatively low energy consumption, low production cost and the like, and is easy for mass production.