51results about How to "Improved rate cycle performance" patented technology

The invention belongs to the technical field of batteries, and specifically discloses a preparation method of a lithium manganese phosphate / carbon composite material with a nano-micro hierarchical structure, which will contain a manganese source, a lithium source, a phosphorus source, hexamethylenetetramine, ethylene glycol The raw material solution is heat-treated at 70°C to 80°C in advance, and then solvothermally obtained at 160°C to 200°C. The prepared lithium manganese phosphate material with nano-micro hierarchical structure is mixed with a polymer carbon source, dried and calcined at 500°C to 650°C in a protective atmosphere. The primary particles of the material prepared by the invention are nano-scale, have preferential growth and uniform distribution, and are beneficial to the diffusion of lithium ions in the material. The size of the secondary particles is at the micron level, which is conducive to the stability of the structure. The prepared material has a high charge and discharge capacity, excellent cycle stability, and good rate performance.

The invention relates to the technical field of lithium ion batteries, in particular to a high-power lithium ion battery positive plate and a lithium ion battery thereof. The invention discloses a high-power lithium ion battery positive plate, which comprises a current collector and cathode material, wherein the cathode material comprises positive active substances, bonding agent and conductive agent, and is characterized in that the positive active substance is formed by layered lithium cobalt oxide and layered nickel cobalt lithium manganese oxide, and the proportion by weight of lithium cobalt oxide and nickel cobalt lithium manganese oxide is 1-7:1-9. The invention further provides a lithium ion battery which contains the positive plate. The invention solves the problems of bad heavy-current discharge and poor performance high circulation generated after layered nickel cobalt lithium manganese oxide material is used on a high-power lithium ion battery owing to the weaknesses existing in the nickel cobalt lithium manganese oxide material of lower electric conductivity and tap density. The lithium ion battery disclosed by the invention has excellent heavy-current discharge performance and high circulation performance, wherein the25 C continuous discharge capacity is 88% of the 0.5C discharge capacity, and the capacity conservation rate is 85% after 20 C cell multiplying power circulates 120 cycles.

The invention discloses a porous hard-carbon lithium ion battery anode material, a preparation method thereof and a lithium ion battery. The method comprises steps as follows: hydrogenated vegetable oil powder is prepared firstly and then is subjected to low-temperature carbonizing treatment in inert gas, a precursor is prepared, the precursor is subjected to organic carbon source coating treatment with a solvent and an organic carbon source, material particles are prepared, finally, the material particles are subjected to high-temperature carbonizing treatment, and the porous hard-carbon lithium ion battery anode material is prepared. The method adopts a simple process, a synthesis path is simple and controllable, micro-control for morphology and size of the material is easy, and the prepared porous hard-carbon lithium ion battery anode material is high in reversible capacity and good in rate capability cycle performance and low-temperature performance.