CN117949341A - Method for determining proportion of graphite carbon to amorphous carbon in anode material - Google Patents
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 229910003481 amorphous carbon Inorganic materials 0.000 title claims abstract description 81
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 78
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 55
- 239000010439 graphite Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000010405 anode material Substances 0.000 title abstract description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 33
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 33
- 238000001757 thermogravimetry curve Methods 0.000 claims abstract description 31
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 29
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 239000007773 negative electrode material Substances 0.000 claims abstract description 17
- 230000004580 weight loss Effects 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 238000002411 thermogravimetry Methods 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 13
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 11
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 26
- 239000005751 Copper oxide Substances 0.000 claims description 26
- 229910000431 copper oxide Inorganic materials 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 4
- 239000003610 charcoal Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 10
- 239000003575 carbonaceous material Substances 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007416 differential thermogravimetric analysis Methods 0.000 description 6
- 238000001069 Raman spectroscopy Methods 0.000 description 5
- 238000001237 Raman spectrum Methods 0.000 description 4
- 229910002090 carbon oxide Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 238000000634 powder X-ray diffraction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000013213 extrapolation Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OKTJSMMVPCPJKN-YPZZEJLDSA-N carbon-10 atom Chemical compound [10C] OKTJSMMVPCPJKN-YPZZEJLDSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a method for determining the proportion of graphite carbon to amorphous carbon in a negative electrode material, and relates to the technical field of negative electrode material detection. The method comprises the following steps: s1, uniformly mixing a sample to be detected and metal oxide according to a mass ratio of 1:10-20 to obtain a mixture; s2, performing thermogravimetric analysis on the mixture in a nitrogen atmosphere to obtain a thermogravimetric analysis curve of the sample; and S3, calculating the percentage content of amorphous carbon and graphite carbon in the sample to be detected according to the thermogravimetric analysis curve. According to the principle that carbon materials can react with metal oxides to generate carbon dioxide gas and metal simple substances under the nitrogen atmosphere, the invention adopts thermogravimetric analysis and test by utilizing the difference of thermal stability of graphite carbon and amorphous carbon. According to different weight loss temperatures of carbon dioxide gas generated by the reaction of graphite carbon and amorphous carbon with metal oxide under the nitrogen atmosphere and the weight loss of carbon dioxide gas at the corresponding temperature, the proportion of graphite carbon and amorphous carbon in the anode material is calculated, and the method has the characteristic of high accuracy.
Description
Technical Field
The invention relates to the technical field of negative electrode material detection, in particular to a method for measuring the proportion of graphite carbon and amorphous carbon in a negative electrode material.
Background
Graphitic carbon is a common battery negative electrode material with good conductivity and stability. In a battery, negative graphitic carbon plays a role in storing and releasing charge. The conductivity determines the output power and charge-discharge efficiency of the battery.
Amorphous carbon is a battery material of amorphous structure. Unlike graphitic carbon, amorphous carbon has no regular crystalline structure, and thus its atomic arrangement is more loose. This allows the amorphous carbon to have a larger surface area, which in turn provides more electrochemically active sites. Meanwhile, the amorphous carbon also has higher capacitance and energy storage density.
In the negative electrode material, the ratio of graphitic carbon to amorphous carbon plays an important role in battery performance. The proper ratio can improve the performance and cycle life of the battery. Currently, the commonly used testing methods mainly include Raman (Raman), X-ray powder diffraction (XRD), and the like, and the Raman and XRD determine the ratio of the graphitic carbon and amorphous carbon according to the different peak positions and the corresponding peak areas/peak intensities. However, the response and the sensitivity of the Raman test to the sample are different at different times, so that only data of the same batch have comparative value, and the data measured at different times are not well compared; and the detection depth of the two test instruments to the sample is limited, and the uniformity of the sample greatly affects the result.
The traditional determination method has more or less defects, and the development of a more efficient, simple and accurate method for testing the ratio of graphite carbon to amorphous carbon is urgent.
Disclosure of Invention
The invention aims to provide a method for measuring the proportion of graphite carbon and amorphous carbon in a negative electrode material, and the accuracy of a test result is improved.
In order to solve the problems, the invention provides the following technical scheme:
A method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material, comprising the steps of:
S1, uniformly mixing a sample to be detected and metal oxide according to a mass ratio of 1:10-20 to obtain a mixture;
s2, performing thermogravimetric analysis on the mixture in a nitrogen atmosphere to obtain a thermogravimetric analysis curve of the sample;
and S3, calculating the percentage content of amorphous carbon and graphite carbon in the sample to be detected according to the thermogravimetric analysis curve.
According to the principle that carbon materials can react with different metal oxides (such as copper oxide, iron oxide, zinc oxide and the like) to generate carbon dioxide gas and metal simple substances under the nitrogen atmosphere, the difference of different thermal stability of graphite carbon and amorphous carbon and different temperature of carbon dioxide gas generated by the reaction of the carbon materials with the metal oxides is utilized, and a thermogravimetric analysis test is adopted. The proportion of graphite carbon and amorphous carbon in the anode material is calculated according to different weight loss temperatures of carbon dioxide gas generated by the reaction of graphite carbon and amorphous carbon with metal oxide under the nitrogen atmosphere and the weight loss of carbon dioxide gas at the corresponding temperatures.
It should be noted that the particle size of the sample to be measured and the metal oxide is preferably 300-1000 mesh.
Further, the initial ranges of the thermal heavy reaction temperatures of the metal oxide, the graphite carbon and the amorphous carbon are not overlapped.
Further, the step S3 further includes: and obtaining a thermogravimetric analysis curve of pure graphite carbon and the metal oxide, and obtaining a thermogravimetric analysis curve of pure amorphous carbon and the metal oxide.
Further, the step S3 is specifically to determine a reaction initiation temperature range of amorphous carbon in a thermogravimetric analysis curve of the sample according to the reaction initiation temperature range of pure amorphous carbon and amorphous carbon in the thermogravimetric analysis curve of the metal oxide, thereby determining a carbon dioxide loss weight of amorphous carbon in the sample, and calculating a percentage content of amorphous carbon in the sample to be measured;
And determining the reaction starting temperature range of the graphite carbon in the thermogravimetric analysis curve of the sample according to the reaction starting temperature range of the graphite carbon in the thermogravimetric analysis curve of the pure graphite carbon and the metal oxide, thereby determining the carbon dioxide loss weight of the graphite carbon in the sample, and calculating the percentage content of the graphite carbon in the sample to be detected.
Further, the step S3 is to calculate the percentage content of amorphous carbon and graphite carbon in the sample to be measured according to the formula (1) and the formula (2) respectively;
wherein: m (C) represents the relative atomic mass of carbon;
M (CO2) represents the relative molecular mass of carbon dioxide;
N (MO) represents the mass percent of added metal oxide relative to carbon;
m (CO2) represents the weight loss of carbon dioxide gas generated by the reaction of amorphous carbon and metal oxide in the thermogravimetric process;
m ( Total (S) ) represents the total mass of the mixture tested;
omega ( Graphite carbon )＝1-ω( Amorphous carbon ) formula (2).
Further, in the step S2, in the thermogravimetric analysis, the flow rate of nitrogen is 10-100mL/min, the temperature raising program is 30-1000 ℃, and the temperature raising rate is 1-30 ℃/min.
Further, the metal oxide includes at least one of copper oxide, iron oxide, and zinc oxide.
Further, the metal oxide is copper oxide.
In a thermogravimetric analysis curve of amorphous carbon and copper oxide, the weight loss temperature interval of amorphous carbon is 522.10-623.51 ℃; in the thermogravimetric analysis curve of the graphite carbon and the copper oxide, the weight loss temperature range of the graphite carbon is 663.38-711.11 ℃. Thus, the weight loss of carbon dioxide generated by the reaction of amorphous carbon and metal oxide can be taken as the weight loss of carbon dioxide before 625 ℃.
Further, the step S1 further comprises drying the mixture at 60-90 ℃ for 2-4 hours, and then cooling to room temperature.
Compared with the prior art, the invention has the following technical effects:
According to the principle that carbon materials can react with different metal oxides (such as copper oxide, iron oxide, zinc oxide and the like) to generate carbon dioxide gas and metal simple substances under the nitrogen atmosphere, the difference of different thermal stability of graphite carbon and amorphous carbon and different temperature of carbon dioxide gas generated by the reaction of the carbon materials with the metal oxides is utilized, and a thermogravimetric analysis test is adopted. The proportion of graphite carbon and amorphous carbon in the anode material is calculated according to different weight loss temperatures of carbon dioxide gas generated by the reaction of graphite carbon and amorphous carbon with metal oxide under the nitrogen atmosphere and the weight loss of carbon dioxide gas at the corresponding temperatures. The method has the characteristics of simplicity and convenience in operation, high efficiency, accuracy and no requirement on uniformity of the sample.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of thermogravimetric analysis and differential thermogravimetric analysis of graphitic carbon with copper oxide;
FIG. 2 is a thermogravimetric analysis curve and a differential thermogravimetric analysis curve of amorphous carbon and copper oxide;
FIG. 3 is a thermogravimetric analysis curve and a differential thermogravimetric analysis curve of sample 1 and copper oxide in example 1;
FIG. 4 is a thermogravimetric analysis curve and a differential thermogravimetric analysis curve of sample 2 and copper oxide in example 2;
FIG. 5 is a Raman spectrum and an analysis curve of sample 2 in comparative example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the embodiments described below are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the invention. As used in the specification of the embodiments of the invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Thermogravimetric analysis test of graphitic carbon and amorphous carbon pure samples:
Samples of pure graphitic carbon and pure amorphous carbon were accurately weighed 10mg each, 140mg copper oxide was added each, and they were thoroughly mixed with a mortar. The mixed sample was placed in an oven, dried at 70 ℃ for 2 hours, and then cooled to room temperature.
And (3) placing 15mg of the dried mixed sample of the graphite carbon and the copper oxide into an alumina crucible of a thermogravimetric analyzer, and performing thermogravimetric analysis after a balance is stable to obtain a thermogravimetric analysis curve of the graphite carbon and the copper oxide. Wherein, the flow rate of carrier gas nitrogen is set to be 50mL/min, the temperature rise program is set to be 30-800 ℃ and the temperature rise rate is 10 ℃/min.
The thermogravimetric analysis operation of amorphous carbon and copper oxide is the same as that of graphitic carbon and copper oxide, and will not be described in detail.
Obtaining a thermogravimetric analysis curve and a differential thermogravimetric analysis curve of a graphite carbon and copper oxide mixed sample, as shown in figure 1; the thermogravimetric analysis curve and differential thermogravimetric analysis curve of the amorphous carbon and copper oxide mixed sample are shown in fig. 2.
From the thermogravimetric analysis curves of fig. 1 and 2, it can be seen that the graphitic carbon and copper oxide reactions are clearly distinguished from the amorphous carbon and copper oxide reactions under nitrogen atmosphere. The reaction speed of amorphous carbon and copper oxide is faster, the reaction temperature is lower, the extrapolated starting point (namely the weightless starting temperature point) of the thermal weight curve is 522.10 ℃, and the extrapolated ending point (namely the weightless ending temperature point) of the thermal weight curve is 623.51 ℃; and the initial point of extrapolation of the graphite carbon and copper oxide thermal weight curve (namely, the weight loss initial temperature point) is 663.38 ℃, and the final point of extrapolation of the thermal weight curve (namely, the weight loss final temperature point) is 711.11 ℃.
Therefore, in the thermal weight curve of the sample to be detected and the copper oxide, the weight loss of carbon dioxide before 625 ℃ can be used as the weight loss of carbon dioxide generated by the reaction of amorphous carbon and metal oxide, the percentage of amorphous carbon in the sample can be obtained after formula conversion, and the rest is the percentage of graphite carbon.
Sample 1 and sample 2 were prepared in the composition ratio of graphitic carbon and amorphous carbon of table 1, and then content measurement was performed using different detection methods.
Example 1
Accurately weighing 10mg of sample 1, adding 140mg of copper oxide, and fully mixing the two by using a mortar. The mixed sample was placed in an oven, dried at 70 ℃ for 3 hours, and then cooled to room temperature.
And taking 37.180mg of the mixed sample after a certain amount of drying treatment, placing the mixed sample into an alumina crucible of a thermogravimetric analyzer, and performing thermogravimetric analysis after a balance is stable to obtain a thermogravimetric analysis curve of the sample. Wherein the flow rate of carrier gas nitrogen is set to be 50mL/min, the temperature rise program is 30-800 ℃, and the temperature rise rate is 10 ℃/min.
The thermogravimetric analysis curve is shown in fig. 3, and the percentage of amorphous carbon and graphite carbon in the sample is calculated according to the calculation formulas (1) and (2).
ω( Graphite carbon )＝1-8.93％＝91.07％。
Example 2
Accurately weighing 10mg of sample 2, adding 140mg of copper oxide, and fully mixing the two by using a mortar. The mixed sample was placed in an oven, dried at 70 ℃ for 3 hours, and then cooled to room temperature.
And taking 26.854mg of the mixed sample after a certain amount of drying treatment, placing the mixed sample into an alumina crucible of a thermogravimetric analyzer, and performing thermogravimetric analysis after a balance is stable to obtain a thermogravimetric analysis curve of the sample. Wherein the flow rate of carrier gas nitrogen is set to be 50ml/min, the temperature rise program is 30-800 ℃, and the temperature rise rate is 10 ℃/min.
The thermogravimetric analysis curve is shown in fig. 4, and the percentage of amorphous carbon and graphite carbon in the sample is calculated according to the calculation formulas (1) and (2).
ω( Graphite carbon )＝1-22.09％＝77.91％。
Comparative example 1
Sample 2 was further taken and tested by a laser raman spectrometer, and the ratio of graphite carbon to amorphous carbon in sample 2 was obtained by a peak area method as comparative example 1. The specific operation process is as follows:
10mg of sample 2 was taken, and the appropriate sample was cut with scissors and placed in the middle of the slide on the viewing stage. And after the parameters are adjusted, the Raman spectrum is acquired, and a Raman spectrum diagram is obtained. Instrument parameter setting: the wavelength of the test was 50-4000cm -1, the laser power was 1.7mw, the grating 4800, the integration time was 80 and the power was 0.7 steps using a 532nm laser.
The obtained Raman spectrum and specific analysis are shown in FIG. 5, and the ratio of graphite carbon to amorphous carbon was obtained by the peak area method based on the peak position difference between graphite carbon and amorphous carbon (peak position of graphite carbon: 1570.89cm -1, peak position of amorphous carbon: 1330.74cm -1).
Table 1 proportions of graphitic carbon and amorphous carbon in samples 1 and 2 formulated
| Composition of the composition | Sample 1 | Sample 2 |
| Graphite carbon | 90％ | 75％ |
| Amorphous carbon | 10％ | 25％ |
TABLE 2 proportions of graphitic carbon and amorphous carbon measured in examples 1-2, comparative example 1
| Composition of the composition | Example 1 | Example 2 | Comparative example 1 |
| Graphite carbon | 91.07％ | 77.91％ | 82.61％ |
| Amorphous carbon | 8.93％ | 22.09％ | 17.39％ |
From a combination of the results in tables 1 and 2, it is apparent that the detection result obtained by detecting the method for measuring the ratio of graphite carbon to amorphous carbon in the anode material provided by the invention is more accurate.
In summary, according to the method for determining the proportion of graphite carbon to amorphous carbon in the anode material, the proportion of graphite carbon to amorphous carbon in the anode material is calculated according to different weightlessness temperatures of carbon dioxide generated by the reaction of graphite carbon and amorphous carbon with metal oxide under the nitrogen atmosphere and the weightlessness of carbon dioxide under the corresponding temperatures. The method has the characteristics of simplicity and convenience in operation, high efficiency, accuracy and no requirement on uniformity of the sample.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (9)
1. A method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material, comprising the steps of:
S1, uniformly mixing a sample to be detected and metal oxide according to a mass ratio of 1:10-20 to obtain a mixture;
s2, performing thermogravimetric analysis on the mixture in a nitrogen atmosphere to obtain a thermogravimetric analysis curve of the sample;
and S3, calculating the percentage content of amorphous carbon and graphite carbon in the sample to be detected according to the thermogravimetric analysis curve.
2. The method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material according to claim 1, wherein the initial ranges of the thermal re-reaction temperatures of the metal oxide and graphitic carbon, amorphous carbon do not overlap.
3. The method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material according to claim 2, wherein the step S3 further comprises: and obtaining a thermogravimetric analysis curve of pure graphite carbon and the metal oxide, and obtaining a thermogravimetric analysis curve of pure amorphous carbon and the metal oxide.
4. The method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material according to claim 3, wherein the step S3 is specifically to determine the reaction initiation temperature range of amorphous carbon in the thermogravimetric analysis curve of the sample according to the reaction initiation temperature range of pure amorphous carbon and amorphous carbon in the thermogravimetric analysis curve of the metal oxide, thereby determining the carbon dioxide loss weight of amorphous carbon in the sample, and calculate the percentage content of amorphous carbon in the sample to be tested;
And determining the reaction starting temperature range of the graphite carbon in the thermogravimetric analysis curve of the sample according to the reaction starting temperature range of the graphite carbon in the thermogravimetric analysis curve of the pure graphite carbon and the metal oxide, thereby determining the carbon dioxide loss weight of the graphite carbon in the sample, and calculating the percentage content of the graphite carbon in the sample to be detected.
5. The method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material according to claim 4, wherein the step S3 is to calculate the percentage contents of amorphous carbon and graphitic carbon in the sample to be measured according to the formulas (1) and (2), respectively;
wherein: m (C) represents the relative atomic mass of carbon;
M (CO2) represents the relative molecular mass of carbon dioxide;
N (MO) represents the mass percent of added metal oxide relative to carbon;
m (CO2) represents the weight loss of carbon dioxide gas generated by the reaction of amorphous carbon and metal oxide in the thermogravimetric process;
m ( Total (S) ) represents the total mass of the mixture tested;
omega ( Graphite carbon )＝1-ω( Amorphous carbon ) formula (2).
6. The method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material according to claim 1, wherein in the step S2, the flow rate of nitrogen gas in the thermogravimetric analysis is 10 to 100mL/min, the temperature-raising program is 30 to 1000 ℃ and the temperature-raising rate is 1 to 30 ℃/min.
7. The method of determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material according to claim 1, wherein the metal oxide comprises at least one of copper oxide, iron oxide, zinc oxide.
8. The method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material according to claim 7, wherein the metal oxide is copper oxide.
9. The method for determining the ratio of graphitic carbon to amorphous carbon in a negative electrode material according to claim 1, wherein the step S1 further comprises drying the mixture at 60 to 90 ℃ for 2 to 4 hours, and then cooling to room temperature.
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