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Method for evaluating graphite and /or graphitized carbon material electrochemical performance

A graphitized carbon and electrochemical technology, applied in the direction of material electrochemical variables, can solve the problems of long experimental period, high cost, and difficulty in meeting the inspection requirements of battery manufacturers for incoming materials, so as to reduce production costs, save manpower and Material resources, the effect of reducing the cost of testing and inspection

Inactive Publication Date: 2008-02-20
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the data obtained by this method is reliable, it has the disadvantages of long experimental period and high cost.
For example, for the cycle life performance test, under normal circumstances, it takes half a month to one month. Such a long test period is difficult to meet the incoming inspection requirements of battery manufacturers.

Method used

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  • Method for evaluating graphite and /or graphitized carbon material electrochemical performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example is used to illustrate the method for evaluating the electrochemical performance of graphite and / or graphitized carbon materials provided by the present invention.

[0030] Instrument: D / MAX2200PC X-ray powder diffractometer produced by Rigaku Corporation;

[0031] Instrument configuration and test conditions: Copper X-ray source, wavelength λ=1.54056 angstroms, Cu / Kα1, the power used for Cu target is 40 kV, 20 mA; graphite monochromator is used; the scan rate of goniometer is 6 degrees / minutes, the scanning range is 2θ=10°-80°, the scanning method is θ / 2θ linkage scanning; the scanning step is 0.02 degrees / step; the divergence slit of the optical path is 1°, the anti-scattering slit is 10 mm Change the slit to automatic adjustment of the instrument, and the receiving slit is 0.3 mm;

[0032] Instrument data processing software: MDI-JADE (5.0);

[0033] Graphite and / or graphitized carbon material samples: domestic natural graphite samples, number I;

[00...

Embodiment 2-6

[0040] The present examples 2-6 are used to illustrate the determination method for evaluating the electrochemical performance of graphite and / or graphitized carbon materials provided by the present invention.

[0041]Carry out XRD diffraction test to graphite and / or graphitized carbon material sample II, III, IV, V and VI shown in table 1 respectively according to the test method described in embodiment 1, and according to the method described in embodiment 1 to graphite and / or the electrochemical properties of graphitized carbon material samples, the difference is that sample I is replaced by domestic series of graphite and / or graphitized carbon material samples II, III, IV, V and VI, and the diffraction pattern of the sample is as follows As shown in B, C, D, E, and F in Figure 1, the 002 interplanar spacing value d of the sample 002 , 002 and 100 crystal plane FWHM 002 and FWHM 100 , the degree of graphitization G% value, the crystal layer stacking thickness Lc value, th...

Embodiment 7-12

[0046] The following examples are used to verify the effectiveness of the method of the present invention.

[0047] 1. Electrochemical specific capacity of graphite and / or graphitized carbon materials. Test the electrochemical specific capacity of graphite and / or graphitized carbon materials according to the following steps:

[0048] A metal lithium sheet with a thickness of 0.06 mm, a diameter of 16 mm, and a weight of 0.0064 g is used as the negative electrode active material, and the modified polypropylene diaphragm is used as the diaphragm, and 1 mol / liter of LiPF 6 The solution is an electrolyte, and 0.05 grams of the same graphite or graphitized carbon material as the above-mentioned samples I, II, III, IV, V and VI are used as the positive electrode active material to make 2016 button batteries S1-S6.

[0049] The electrochemical specific capacity was determined according to the following steps: the battery was left on hold for 60 minutes, and then converted to a volta...

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Abstract

The utility model provides an evaluation method of the electrochemical performance of graphite or graphitized carbon material as the cathode material of quadric lithium-ion battery. The method comprises gathering the crystal parameter values of graphite or graphitized carbon material, setting the circumscription of the crystal parameter values of graphite or graphitized carbon material and comparing the gathered crystal parameter values with the preset circumscription of the crystal parameter values. If the gathered crystal parameter values are in the preset circumscription of the crystal parameter values, the electrochemical performance of the graphite or graphitized carbon material meets battery requirement. The crystal parameter values of graphite or graphitized carbon material are the interplanar spacing value and diffraction peak width value or the graphitization degree value and accumulation thickness value of crystal deck and / or size value of crystal. The electrochemical performance is the electrochemical specific volume of the graphite or graphitized carbon material and the cycle life. The method provided by the utility model can judge the electrochemical performance of graphite or graphitized carbon material in short time.

Description

technical field [0001] The present invention relates to a method for evaluating the electrochemical properties of graphite and / or graphitized carbon materials, in particular to a method for evaluating the electrochemical properties of graphite and / or graphitized carbon materials used as negative electrode materials for secondary lithium ion batteries for mobile phones Methods. Background technique [0002] Graphite and / or graphitized carbon materials have typical layered structure characteristics. In the graphite layer, the carbon atoms are arranged in a hexagonal shape and extend to the two-dimensional direction. Each carbon atom between layers and its adjacent three carbon atoms are sp 2 The hybrid strong σ bond structure exists, and the structure is quite stable; between graphite layers, carbon-carbon is only combined by weak Van der Waals force (Van der Waals), and the interlayer spacing is about 0.34 nanometers. The binding force between them is weak and the space is l...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 李永胜
Owner BYD CO LTD
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