Nickel-cobalt-manganese NCM ternary material power lithium ion battery

Abstract

The invention relates to the field of lithium ion battery, and discloses a nickel-cobalt-manganese NCM ternary material power lithium ion battery including a positive electrode and a negative electrode; a positive electrode material includes, in parts by weight, 93-95 parts of a nickel-cobalt-manganese NCM ternary material, 3.5-4.5 parts of a positive electrode conductive agent, 2-3 parts of a positive electrode adhesive, and 15-25 parts of a dissolving agent; the negative electrode material includes, in parts by weight, 94-96 parts of a negative electrode particle material, 0.9-1.2 parts of anegative electrode conductive agent, 2-2.4 parts of a thickening agent, and 2-2.4 parts of a negative electrode adhesive; the negative electrode particle material has a core-shell structure, a core material is artificial graphite, and a shell material is amorphous carbon. The positive electrode material well cooperates with the negative electrode material; the negative electrode material has small particles and has good adhesion power and uniformity on a copper foil, and the contact internal resistance is low. After the lithium ion battery is prepared, not only is the internal resistance of the battery reduced, but also the low temperature performance, the high temperature performance and the cycle performance of the battery can be improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a nickel-cobalt-manganese NCM ternary material power lithium-ion battery. Background technique [0002] With the gradual strengthening of energy and environmental awareness, new energy vehicles have made great progress in recent years. Among them, electric vehicles are one of the main directions. In the power battery of electric vehicles, lithium-ion batteries occupy a very important position. [0003] In lithium-ion power batteries, lithium manganese oxide is one of the choices of positive electrode active materials. [0004] For example, the Chinese invention patent with application number CN201310726770.X discloses a preparation method of a long-term high-temperature cycle nickel-cobalt-lithium manganese oxide NCM523 ternary material for lithium-ion batteries. The chemical formula of the long-term high-temperature cycle lithium cobalt manganese oxide NCM523 ternary mate...

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Problems solved by technology

[0005] However, there are also certain defects in the nickel-cobalt-manganese NCM ternary material lithium ion power battery of the prior art, for example, the negative electrode material is generally selected as graphite, and the cooperation between the nickel-cobalt-manganese NCM ternary material positive electrode material and the negative electrode material is not ideal; in addition Large particles of negative electrode material, poor adhesion and uniformity of negative electrode material on copper foil, which will lead to high internal resistance of the battery, poor low temperature performance, high temperature discharge performance, and poor cycle performance

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