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Evaluation method for gram volume of graphite cathode material

A graphite negative electrode and evaluation method technology, which is applied in the direction of material electrochemical variables, can solve the problems of absolute value test failure, inability to compare different materials, and the influence of lithium-ion capacity button battery assembly conditions, etc., to improve efficiency and simplify experiments conditional effect

Inactive Publication Date: 2015-05-13
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Evaluation method for gram volume of graphite cathode material
  • Evaluation method for gram volume of graphite cathode material
  • Evaluation method for gram volume of graphite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Cyclic voltammetry test conditions: the scanning voltage range is 0V to 2V, and the scanning rate is 0.3mV / s.

[0032] Button battery assembly: commercial button battery assembly CR2430, including bottom cover, gasket, spring leaf, top cover.

[0033] Graphite negative electrode sheet: prepared by coating graphite negative electrode sample 1, sample 2, and sample 3 on copper foil.

[0034] Diaphragm: polyethylene diaphragm

[0035] Table 1

[0036]

[0037] Test results, as shown in Table 2:

[0038] Table 2

[0039] Graphite material sample

Embodiment 2

[0041] Cyclic voltammetry test conditions: the scanning voltage range is 0V to 2V, and the scanning rate is 0.2mV / s

[0042] Button battery assembly: commercial button battery assembly CR2430, including bottom cover, gasket, spring leaf, top cover.

[0043] Graphite negative electrode sheet: prepared by coating graphite negative electrode sample 1, sample 2, and sample 4 on copper foil respectively.

[0044] Diaphragm: Polypropylene diaphragm

[0045] table 3

[0046]

[0047] Test results, as shown in Table 4:

[0048] Graphite material sample

Embodiment 3

[0050] Cyclic voltammetry test conditions: the scanning voltage range is 0V to 1.5V, and the scanning rate is 0.3mV / s

[0051] Button battery assembly: commercial button battery assembly CR2430, including bottom cover, gasket, spring leaf, top cover.

[0052] Graphite negative electrode sheet: prepared by coating graphite negative electrode sample 1, sample 2, and sample 3 on copper foil.

[0053] Diaphragm: polyethylene diaphragm

[0054] table 5

[0055]

[0056] Table 6

[0057] Graphite material sample

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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...

Claims

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Application Information

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IPC IPC(8): G01N27/48
Inventor 张涛刘婧孟繁慧王欣全周江孔令丽伍绍中史杭
Owner TIANJIN LISHEN BATTERY
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