High-voltage anode material for lithium ion battery and lithium ion battery comprising same

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a high-voltage anode material for a lithium ion battery. The anode material comprises a material A and a material B, wherein the material A has a core-shell structure, a core layer material is lithium cobalt oxide particles formed by primary particles, the median particle diameters D50 of the lithium cobalt oxide particles are 15-25 microns, and the structure formula of a core-shell material is LixNiyMnzPO4; the material B has a core-shell structure, the core layer material is the lithium cobalt oxide particles formed by secondary particles, and the median particle diameters D50 of the lithium cobalt oxide particles are is 3-9 microns; and the structure formula of the core-shell material is LiwAlpZrqO2, and the mass ratio of the material A to the material B is (0.1-10) to 1. Compared with the prior art, the high-voltage anode material for the lithium ion battery provided by the invention has the advantages that the large and small lithium cobalt oxide particles are combined reasonably, different core layer materials can be arranged on the surfaces of the lithium cobalt oxide particles, and the secondary particles are selected as the small lithium cobalt oxide particles, so that the cycle performance and the safety performance of the anode material under high voltage are notably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage lithium ion battery cathode material and a lithium ion battery containing the material. Background technique [0002] Lithium-ion batteries generally include: a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive and negative electrode sheets, and an electrolyte, wherein the positive electrode sheet includes a positive electrode current collector and a positive electrode material layer distributed on the positive electrode current collector, and the negative electrode sheet It includes a negative electrode current collector and a negative electrode material layer distributed on the negative electrode current collector. At present, the commonly used lithium-ion cathode material is LiCoO 2 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , LiMn 2 o 4 and LiFePO 4 Wait. [0003] The above several cathode material...

AI Technical Summary

Problems solved by technology

[0010] One of the purposes of the present invention is to: address the deficiencies in the prior art, and provide a high-voltage lithium-ion battery positive electrode material and a lithium-ion battery comprising the material, the positive electrode material can charge at a higher cut-off voltage (4.4V- 4.7V), and has high thermal stability, so that the lithium-ion battery using this positive electrode material has a higher volumetric energy density and better cycle performance, thereby overcoming the thermal stability of the positive electrode material in the prior art The performance is poor, and the structure is easy to change when used under high voltage. Even if it is coated, it cannot effectively improve the volume energy density of the battery.