34results about How to "Improve lithium intercalation capacity" patented technology

The invention provides a preparation method of a hard carbon negative electrode material. The preparation method comprises steps as follows: aggregates and asphalt with a softening point being 200-280DEG C are mixed and kneaded at 300-380 DEG C, and a mixed material is obtained; the mixed material is subjected to molding and then is carbonized at 400-500 DEG C, and a precursor is obtained; the precursor is crushed and carbonized at 900-1400 DEG C, and the hard carbon negative electrode material is obtained. Compared with the prior art, the preparation method has the beneficial effects as follows: air and asphalt can be sufficiently and uniformly mixed in a mixing and kneading pot, a uniform cross-linking reaction is performed, oxygen-containing functional groups on the surface of asphaltare increased through oxidizing modification, and superior conditions are created for production of a large quantity of uniform lithium storage holes based on carbonization.

The invention relates to a power lithium-ion battery negative electrode material with a core-shell structure of an electric automobile and a preparation method thereof. The power lithium-ion battery negative electrode material comprises a graphite core and a shell, wherein the shell has a single-layer structure or a double-layer structure and is formed by one cladding or two cladding through a solid-phase cladding method; the shell with the single-layer structure is a hard-carbon and soft-carbon mixed carbide layer; the shell with the double-layer structure consists of an inner layer and an outer layer, the inner layer is a hard-carbon and soft-carbon mixed carbide layer, and the outer layer is a pure soft carbon carbide layer. The shell is prepared by the following steps: uniformly mixing and cladding the crushed hard-carbon and soft-carbon mixed coatings and isotropic graphite in a conical mixer, performing carbonization in an inert atmosphere, cooling, crushing and screening to obtain the shell formed by one cladding or a shell formed by two cladding. The compatibility of the graphite negative electrode material on an electrolyte solution is enhanced, and the problems that a lithium ion battery is poor in rate charge and discharge performance in high / low-temperature environments and a graphite structure is easily damaged in a charge and discharge process are solved.

The invention discloses a silicon-containing porous amorphous alloy negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the field of electrochemical power sources. The negative electrode material mainly comprises 10 to 60 at% of Si, 10 to 35 at% of B and 0 to 55 at% of Fe, with the balance being other elements. The preparation method comprises the following steps: adding Si-containing Fe-based amorphous alloy (an amorphous nanocrystal composite material) into dilute hydrochloric acid for corrosion so as to remove Fe; and then successively carrying out standing, pumping filtration, washing, drying, ultrasonic crushing and sieving so as to obtain the silicon-containing porous amorphous alloy material. The preparation method which prepares the silicon-containing porous amorphous alloy material by using a chemical corrosion method has the advantages of simple preparation process and low cost; and the prepared silicon-containing porous amorphous alloy material has excellent electrochemical properties like high specific capacity and a stable discharge platform when used as the negative electrode material for the lithium ion battery, and has good application prospects.

The invention relates to the field of electrochemical energy storage devices, in particular to a novel lithium ion carbon-based super capacitor. The lithium ion carbon-based super capacitor is composed of a shell, a positive electrode slice, a negative electrode slice, a diaphragm located between the positive electrode slice and the negative electrode slice and organic electrolyte. The lithium ion carbon-based super capacitor is characterized in that the positive electrode slice is mainly formed by pressing activated carbon and a single conductive agent and bonding agent mixing face on a current collector; the negative electrode slice is mainly formed by coating copper foil with graphite and a single conductive agent and bonding agent mixing face; the organic electrolyte is composed of electrolyte salt containing lithium ions and a mixed organic solvent, and a lithium slice and a diaphragm are further arranged between the shell and the negative electrode slice. The super capacitor has the advantages that compared with an existing lithium ion battery, the product is higher in power density, longer in service life and better is safety performance.