Positive electrode active material of battery core, high-voltage high-magnification battery core and manufacturing method thereof

Abstract

The invention relates to a positive electrode active material of a battery core, a high-voltage high-magnification battery core and a manufacturing method thereof. The positive electrode active material is modified nickel cobalt lithium manganate, wherein the modified nickel cobalt lithium manganate is of a single-crystal structure, and the modified nickel cobalt lithium manganate is one or more of doped nickel cobalt lithium manganate and coated nickel cobalt lithium manganate. The battery core comprises a positive electrode, a negative electrode and a diaphragm, and the battery core adopts afull-tab winding type structure in which the diaphragm, the positive electrode, the diaphragm and the negative electrode are connected; the positive electrode comprises a positive electrode binder, apositive electrode conductive agent, a positive electrode current collector and the positive electrode active material; and the negative electrode comprises a negative electrode active material, a negative electrode conductive agent, a negative electrode binder and a negative electrode current collector. According to the invention, the rate capability of the battery core can be improved, and theheating of the battery core at a high rate is reduced, so that the overall performance of the battery core is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, and more specifically, to a positive electrode active material of a battery, a high-voltage, high-rate battery and a manufacturing method thereof. Background technique [0002] Due to its high voltage, high energy density, and long cycle life, lithium-ion batteries are currently widely used in the field of power and energy storage, but they also have a series of problems. The cut-off voltage of the currently used ternary cells is basically 4.2V, which has certain restrictions on the power density and energy density of the cells. In today's environment of pursuing energy density, the currently widely used ternary cathode materials have the characteristics of high energy density, but the general discharge current is small, which greatly affects the use range of ternary batteries. For example, if the discharge current is small, the acceleration ability of the electric vehicle will be reduced, w...

AI Technical Summary

Problems solved by technology

In today's environment of pursuing energy density, the currently widely used ternary cathode materials have the characteristics of high energy density, but the general discharge current is small, which greatly affects the use range of ternary batteries.

For example, if the discharge current is small, the acceleration capability of the electric vehicle will be reduced, affecting customer satisfaction

There are also a small number of high-rate batteries on the market, but the rate performance is generally not good enough and the cycle performance is poor.

The reason for the above problems is that most of the ternary materials used in batteries are polycrystalline structures, the modification of positive electrode materials is unreasonable, and the negative electrode materials have not been targetedly improved, etc.

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