Method for quickly evaluating cycle performance of high-nickel anode material for lithium-ion battery

Abstract

The invention provides a method for quickly evaluating the cycle performance of a high-nickel anode material for a lithium-ion battery, comprising: providing a high-nickel anode material to be testedand a standard high-nickel anode material meeting preset cycle performance requirements, and assembling the materials respectively with the same cathode and diaphragm by the same method to obtain a standard battery and a battery to be tested; performing pre-charge aging and capacity grading on the standard battery and the battery to be tested under the same condition, and charging and dischargingthe batteries by 0.01C to 1C for 1 to 3 cycles on a battery detection system; collecting charge and discharge capacity (Q) and voltage (V) data, and drawing dQ / dV-V curves of the standard battery andthe battery to be tested; extracting H2 to H3 peaks of a voltage interval 4.0 to 4.2V according to the dQ / dV-V curves, and judging the cycle performance of the standard battery and the battery to be tested according to the H2 to H3 peaks and the changes thereof.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a rapid evaluation method for the cycle performance of high-nickel positive electrode materials of lithium-ion batteries. Background technique [0002] Lithium-ion secondary battery is the most competitive battery of the new generation, known as "green energy", and is the preferred technology to solve contemporary environmental pollution and energy problems. In recent years, lithium-ion secondary batteries have achieved great success in the field of high-energy batteries, but consumers still expect batteries with higher comprehensive performance, which depends on the research and development of electrode materials and electrolyte systems. Due to the high nickel content and nickel being the main redox reaction element, the high nickel cathode material can effectively improve the specific capacity of the lithium battery cathode material. [0003] The curr...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a rapid evaluation method for the cycle performance of high-nickel positive electrode materials in lithium-ion batteries, aiming to solve the problems of long time-consuming, high energy consumption and high cost in existing methods for evaluating the cycle performance of high-nickel positive electrodes

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