Lithium ion battery with high-rate charge-discharge performance

Abstract

The invention discloses a lithium ion battery with high-rate charge-discharge performance. According to the lithium ion battery, high-rate lithium cobalt oxide is taken as an anode, high-rate intermediate carbon microspheres are taken as a cathode, and graphene is taken as a conductive additive. Cathode and anode material systems with the high-rate properties are adopted, the surface density and the compaction density of pole pieces of the anode and the cathode are controlled, high conductivity of the pole pieces is guaranteed, and the high-current charge-discharge performance of the battery is improved. The graphene with the high conductivity is taken as the conductive additive, the defect that the proportion of active materials for the anode and the cathode is reduced due to heavy addition of a conventional conductive additive is overcome, and the volume energy density of the battery is increased. An electrolyte containing a PC (polycarbonate) solvent with a high solidifying point and high electric conductivity is adopted, so that the heat dissipation problem of the battery under the high-current charge and discharge condition is effectively solved, and the cyclic stability of the battery is further guaranteed. The lithium ion battery is simple in process, and the performance of the prepared lithium battery is excellent.

Description

technical field

[0001] The invention relates to a lithium ion battery with high rate charge and discharge performance, belonging to the field of lithium ion batteries. Background technique

[0002] Since Japan's Sony Corporation took the lead in developing and commercializing lithium-ion batteries in 1990, lithium-ion batteries have developed rapidly. Nowadays, lithium-ion batteries have been widely used in various fields of civil and military use. With the continuous advancement of science and technology, people have put forward more and higher requirements for the performance of batteries: the miniaturization and personalized development of electronic devices require batteries to have smaller volume and higher specific energy output; aerospace energy requirements Batteries have cycle life, better low-temperature charge-discharge performance and higher safety performance; electric vehicles require batteries with large capacity, low cost, high stability and safety performan...

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