Evaluation method for gram volume of graphite cathode material

Abstract

The invention discloses an evaluation method for gram volume of a graphite cathode material. The method comprises the following steps: firstly, testing a button half cell made from a graphite cathode through cyclic voltammetry, and then, judging relative size of gram volume of different graphite cathodes by comparing voltage at a lithium deintercalation peak position in a first cyclic voltammetry curve. The higher the electric potential at the lithium deintercalation peak position, the lower the gram volume of graphite cathode. As a relative value comparison method, the evaluation method can compare and evaluate advantages and disadvantages of gram volume of different graphite cathodes more conveniently in comparison with the conventional method for testing the gram volume of graphite by relative values, and can better adapt to the demand of rapid evaluation in actual production research and development.

Description

technical field [0001] The invention belongs to the technical field of evaluation of graphite negative electrode materials, in particular to an evaluation method for the gram capacity of graphite negative electrode materials. Background technique [0002] With the deterioration of the global environment year by year, clean energy has attracted the attention of all countries. In recent years, countries have been vigorously promoting electric vehicles. As an important energy solution for electric vehicles, lithium-ion batteries have also become the focus of various research institutions and companies. The various materials involved in lithium-ion batteries have been greatly developed. Scientific researchers from various countries are constantly updating the performance indicators of materials, and the updating speed of new products of various material companies is also accelerating. For battery manufacturers, how to efficiently evaluate materials within a limited time and s...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a small battery test tooling equipment to solve the problem that the traditional method for measuring the gram capacity of graphite negative materials exists, and the measurement is extremely vulnerable to the weighing process and the pole piece production process (slurry preparation, coating, etc.) The delithiation capacity is easily affected by the assembly conditions of the coin cell, resulting in the failure of the absolute value test, which makes it impossible to compare different materials.

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