Lithium ion secondary battery and cathode material prepared by same

Abstract

The invention relates to the lithium ion battery field, in particular to a high-capacity cathode material and a high energy density lithium ion secondary battery prepared by the cathode material. The cathode material comprises a cathode active material, an adhesive and a conductive agent, wherein the cathode active material is a composite material of a lithium cobalt oxide active material A and a high nickel active material B; the high nickel active material B is pretreated before mixing; and the mass ratio of the high nickel active material B to the lithium cobalt oxide active material A is between 0.82 and 9. The cathode material can not only prepare the batteries with higher capacity and energy density but also solve the problem of high temperature gas production in the batteries.

Description

technical field

[0001] The invention relates to the field of lithium-ion batteries, in particular to high-capacity cathode materials and high-energy-density lithium-ion secondary batteries prepared using the materials. Background technique

[0002] Lithium-ion secondary batteries have become one of the most widely used secondary batteries due to their advantages of high voltage and high energy density. With the continuous development of miniaturization and long standby time of portable electronic devices, the energy density, especially the volumetric energy density, of lithium-ion batteries used as power sources has been continuously improved to meet the increasing demand.

[0003] At present, the most mature positive electrode material for energy-type lithium-ion secondary batteries is lithium cobalt oxide. The positive electrode diaphragm composed of it can have a compact density of 4.1g / cc without affecting battery performance, and has excellent cycle performance. , but ...

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