CN112268916A - Method for rapidly characterizing performance of binary anode material for lithium ion battery - Google Patents
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Abstract
The invention provides a method for rapidly characterizing the electrochemical capacity of a binary anode material for a lithium ion battery. The method can directly and effectively represent the actual capacity of the material by quantitatively measuring the width at half maximum. And the acquisition time of the XRD spectrum only needs dozens of minutes, so that the time consumed by electrochemical characterization can be greatly saved, and great convenience is brought to production and quality monitoring.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for rapidly characterizing the performance of a binary anode material for a lithium ion battery.
Background
With the development of lithium ion battery technology, the chemical general formula of the ternary material is LiNi1-x-yCoxMyO2The proportion of (M ═ Mn or Al) occupying the positive electrode material is increasing year by year. However, because Co is extremely toxic and expensive, enterprises and research institutes are shifting the development of positive electrode materials toward "decobalization". The cobalt-free material has the general chemical formula: LiNi1-xMxO2Wherein M is a transition group metal element other than Co. The material has a layered structure or a mixed structure of a layered structure and a spinel structure, and has large lithium ion storage capacityCapability.
The storage capacity of lithium ions can be characterized by testing the buckling capacity under different current densities, and the conventional buckling mainly adopts a positive electrode material as a cathode, lithium metal as an anode and an organic matter containing lithium salt as an electrolyte. While the different current densities may be determined by the intrinsic capacity of the material. It is stated in the industry that the current density required to charge or discharge a material from or to a fully discharged state for n hours is fixedly referred to as 1/n C. In order to obtain a better cathode interface and wettability, a charge-discharge process from a new assembly to a cycle test process is usually required to undergo a charge-discharge process from a low current charge-discharge process to a high current charge-discharge process so as to obtain an optimal characterization capacity, such as 0.1C charge 0.1C discharge, 0.2C charge 0.2C discharge, 0.5C charge 0.5C discharge, and finally 1C charge 1C discharge. It can be seen that it usually takes several days to obtain the capacity of the positive electrode material, which is very disadvantageous to real-time feedback of the material quality during the production process, and therefore it is very important to find a fast and effective capacity characterization means.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide a method for rapidly characterizing the performance of a binary positive electrode material for a lithium ion battery, and the method provided by the present invention can effectively characterize the actual capacity of the binary positive electrode material in only ten minutes.
The invention provides a method for rapidly characterizing the electrochemical capacity of a binary anode material for a lithium ion battery, which comprises the following steps:
A) obtaining the XRD diffraction pattern of the binary anode material standard sample to obtain the full width at half maximum D of each diffraction peak1；
B) Obtaining the XRD diffraction pattern of the binary anode material test sample to obtain the full width at half maximum D of each diffraction peak of the test sample2；
C) Comparing the half-height width of the binary anode material test sample with that of the standard sample, if D1-c<D2<D1+ c, the capacity performance of the binary anode material test sample is normal; if D is2>D1+ c, the capacity of the binary anode material test sample is lower; d2<D1C, the capacity of the test sample of the binary anode material is higher, wherein the capacity of the test sample is D2Capacity of standard sample D1C, c is the amplitude modulation of the full width at half maximum of the standard sample, and is between 0 and 0.1.
The invention also provides a method for rapidly characterizing the electrochemical capacity of the binary anode material for the lithium ion battery, which comprises the following steps:
a) obtaining the XRD diffraction pattern of the binary anode material standard sample to obtain the full width at half maximum D of each diffraction peak1Testing the standard capacity of the binary anode material standard sample;
b) obtaining the XRD diffraction pattern of the binary anode material test sample to obtain the full width at half maximum D of each diffraction peak of the test sample2；
c) Substituting the full width at half maximum of the test sample into a formulated function relation to obtain an electrochemical capacity pre-estimated value of the test sample; the general formula of the formulated functional relation is y ═ ax + b, wherein y is capacity, x is the full width at half maximum of the diffraction peak, a is the slope, and b is a constant.
Preferably, the chemical formula of the binary cathode material is LiNi1-xMxO2Wherein M is one or two selected from Al, Mn, Mg, Fe, Zn, Mo, Ti, Cr, Sn and Sr, and 0<x<1。
Preferably, the plane index of the diffraction peak includes one or more of (003), (104), (006), (012), (008), and (110).
Preferably, the method for testing the standard capacity of the binary positive electrode material standard sample comprises the following steps:
and manufacturing the binary anode material standard sample into a lithium ion button half cell, and measuring the standard capacity.
Preferably, the lithium ion button type half cell is formed by assembling a positive plate, a negative plate, electrolyte, a diaphragm and a shell; the positive plate is prepared from the binary positive material.
Preferably, the proposed functional relation is obtained by:
more than three standard patterns of XRD diffraction patterns and electrochemical capacities are collected, and the full width at half maximum of diffraction peaks is read. And linear fitting is carried out by taking the read full width at half maximum as an x axis and the capacity as a y axis to obtain a drawn functional relation.
Preferably, the scanning speed for obtaining the XRD diffraction pattern of the binary anode material standard sample or the XRD diffraction pattern of the binary anode material test sample is 0.2-5 degrees/min, and the scanning range is 10-80 degrees.
Compared with the prior art, the invention provides a method for rapidly characterizing the electrochemical capacity of a binary anode material for a lithium ion battery, which comprises the following steps: A) obtaining the XRD diffraction pattern of the binary anode material standard sample to obtain the full width at half maximum D of each diffraction peak1Testing the standard capacity of the binary anode material standard sample; B) obtaining the XRD diffraction pattern of the binary anode material test sample to obtain the full width at half maximum D of each diffraction peak of the test sample2(ii) a C) Comparing the half-height width of the binary anode material test sample with that of the standard sample, if D1-c<D2<D1+ c, the performance of the test sample of the binary anode material is normal; if D is2>D1+ c, the capacity of the binary anode material test sample is lower; d2<D1C, the capacity of the test sample of the binary anode material is higher, wherein the capacity of the test sample is D2Capacity of standard sample D1C, c is the amplitude modulation of the full width at half maximum of the standard sample, and is between 0 and 0.1. The binary anode material does not contain Co element and lacks the super exchange effect caused by the Co element, so Ni2+Very easy access to Li+The layer induces cation shuffling. It is worth mentioning that the mixed-discharging of cations can reduce the interplanar spacing of the Li layer, retard the diffusion of lithium ions during the charging and discharging process, and directly lead to the reduction of capacity. In addition, in the binary material, the degree of misarrangement of the cations can be reflected in the (003) and (104) planes of the layered material. (104) The crystal plane is an ordered cross arrangement crystal plane of metal cations and lithium ions, and therefore, the more the mixed arrangement is, the lower the peak intensity of the (104) crystal plane is, the wider the full width at half maximum is, and the peak position is shifted to the left. Based on this, the invention provides quantitative measurementThe width at half maximum width can directly and effectively represent the actual capacity of the material. And the acquisition time of the XRD spectrum only needs dozens of minutes, so that the time consumed by electrochemical characterization can be greatly saved, and great convenience is brought to production and quality monitoring.
Drawings
Fig. 1 is a graph showing a relationship between a full width at half maximum and a capacity of a positive electrode material prepared by example.
Detailed Description
The invention provides a method for rapidly characterizing the electrochemical capacity of a binary anode material for a lithium ion battery, which comprises the following steps:
A) obtaining the XRD diffraction pattern of the binary anode material standard sample to obtain the full width at half maximum D of each diffraction peak1；
B) Obtaining the XRD diffraction pattern of the binary anode material test sample to obtain the full width at half maximum D of each diffraction peak of the test sample2；
C) Comparing the half-height width of the binary anode material test sample with that of the standard sample, if D1-c<D2<D1+ c, the capacity performance of the binary anode material test sample is normal; if D is2>D1+ c, the capacity of the binary anode material test sample is lower; d2<D1C, the capacity of the test sample of the binary anode material is higher, wherein the capacity of the test sample is D2Capacity of standard sample D1C, c is the amplitude modulation of the full width at half maximum of the standard sample, and is between 0 and 0.1.
The test method provided by the invention is suitable for a binary anode material, and the chemical formula of the binary anode material is LiNi1-xMxO2Wherein M is one or two selected from Al, Mn, Mg, Fe, Zn, Mo, Ti, Cr, Sn and Sr, and 0<x<1。
Firstly, obtaining an XRD diffraction pattern of a binary anode material standard sample to obtain full width at half maximum D of each diffraction peak1. Wherein the index of the crystal plane of the diffraction peak comprises one or more of (003), (104), (006), (012), (008) and (110).
The scanning speed adopted for obtaining the XRD diffraction pattern of the binary anode material standard sample is 0.2-5 degrees/min, and the scanning range is 10-80 degrees.
Then, obtaining the XRD diffraction pattern of the binary anode material test sample to obtain the full width at half maximum D of each diffraction peak of the test sample2。
In the invention, the method for obtaining the XRD diffraction pattern of the binary anode material test sample is the same as the method for obtaining the XRD diffraction pattern of the binary anode material standard sample. Wherein the scanning speed is 4 DEG/min.
Finally, comparing the half-height width of the binary anode material test sample with that of the standard sample, if D1-c<D2<D1+ c, the capacity performance of the binary anode material test sample is normal; if D is2>D1+ c, the capacity of the binary anode material test sample is lower; d2<D1C, the capacity of the test sample of the binary anode material is higher, and c is the amplitude modulation of the full width at half maximum of the standard sample and is between 0 and 0.1. In the present invention, the full width at half maximum amplitude modulation is obtained by subtracting the D value of the standard sample from the D value of the sample with normal capacity performance1Thus obtaining the product. I.e. D is a value of D1C. The half-height width amplitude modulation corresponds to the capacity of the normal upper and lower limits of the sample with normal capacity performance, and the capacity of the normal upper and lower limits of the sample with normal capacity performance is set by the product quality or the execution standard of the product. The size of c has corresponding values according to different materials.
In the present invention, the volume of the test sample is D2Capacity of standard sample D1C, when volume D of the test sample2In the volume range D of the standard sample1When the volume is within + -c, the sample can be judged as a non-defective sample, that is, the volume range of the non-defective sample is D1C.
By adopting the method, the capacity of the binary anode material test sample can be determined qualitatively.
The invention also provides a method for rapidly characterizing the electrochemical capacity of the binary anode material for the lithium ion battery, which comprises the following steps:
a) obtaining a binary positive electrodeXRD diffraction pattern of standard sample of material to obtain full width at half maximum D of each diffraction peak1Testing the standard capacity of the binary anode material standard sample;
b) obtaining the XRD diffraction pattern of the binary anode material test sample to obtain the full width at half maximum D of each diffraction peak of the test sample2；
c) Substituting the full width at half maximum of the test sample into a formulated function relation to obtain an electrochemical capacity pre-estimated value of the test sample; the general formula of the formulated functional relation is y ═ ax + b, wherein y is capacity, x is the full width at half maximum of the diffraction peak, a is the slope, and b is a constant.
Firstly, obtaining an XRD diffraction pattern of a binary anode material standard sample to obtain full width at half maximum D of each diffraction peak1. Wherein the index of the crystal plane of the diffraction peak comprises one or more of (003), (104), (006), (012), (008) and (110).
The scanning speed adopted for obtaining the XRD diffraction pattern of the binary anode material standard sample is 0.2-5 degrees/min, and the scanning range is 10-80 degrees.
And then testing the standard capacity of the binary anode material standard sample, wherein the method for testing the standard capacity of the binary anode material standard sample comprises the following steps:
and manufacturing the binary anode material standard sample into a lithium ion button half cell, and measuring the standard capacity.
The lithium ion button type half cell is formed by assembling a positive plate, a negative plate, electrolyte, a diaphragm and a shell; the positive plate is prepared from the binary positive material.
The specific preparation method of the lithium ion button half cell is not particularly limited, and the method known by the person skilled in the art can be used.
Then, XRD diffraction patterns of the binary positive electrode material test samples are obtained, and full widths at half maximum D of all diffraction peaks of the test samples are obtained2。
In the invention, the method for obtaining the XRD diffraction pattern of the binary anode material test sample is the same as the method for obtaining the XRD diffraction pattern of the binary anode material standard sample. Wherein the scanning speed is 4 DEG/min.
Finally, bringing the full width at half maximum of the test sample into a formulated function relation to obtain an electrochemical capacity estimated value of the test sample; the general formula of the formulated functional relation is y ═ ax + b, wherein y is capacity, x is the full width at half maximum of the diffraction peak, a is the slope, and b is a constant.
Wherein the formulated functional relation is obtained by the following method:
the XRD diffraction patterns and electrochemical capacity of more than three standard samples are collected, and the full width at half maximum of diffraction peaks is read. And linear fitting is carried out by taking the read full width at half maximum as an x axis and the capacity as a y axis to obtain a drawn functional relation.
By adopting the method, the capacity of the binary anode material test sample can be semi-quantitatively determined.
The binary anode material does not contain Co element and lacks the super exchange effect caused by the Co element, so Ni2+Very easy access to Li+The layer induces cation shuffling. It is worth mentioning that the mixed-discharging of cations can reduce the interplanar spacing of the Li layer, retard the diffusion of lithium ions during the charging and discharging process, and directly lead to the reduction of capacity. In addition, in the binary material, the degree of misarrangement of the cations can be reflected in the (003) and (104) planes of the layered material. (104) The crystal plane is an ordered cross arrangement crystal plane of metal cations and lithium ions, and therefore, the more the mixed arrangement is, the lower the peak intensity of the (104) crystal plane is, the wider the full width at half maximum is, and the peak position is shifted to the left. Based on this, the present invention can directly and effectively characterize the actual capacity of the material by quantitatively measuring the width at half maximum. And the acquisition time of the XRD spectrum only needs dozens of minutes, so that the time consumed by electrochemical characterization can be greatly saved, and great convenience is brought to production and quality monitoring.
The electrochemical capacity of the anode material is represented by monitoring the crystal face index of the material, so that the purposes of saving test time and quickly realizing performance feedback are achieved. The method is simple and feasible, low in cost and innovative, and brings great convenience to production and quality monitoring.
For further understanding of the present invention, the method for rapidly characterizing the performance of the binary cathode material for lithium ion battery provided by the present invention is described below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1
(1) Taking a positive electrode material K with a chemical general formula of LiNi0.6Mn0.4O2And the capacity of the sample can be fed back to the standard level of the production routine batch, and the sample can be used as a standard sample. An X-ray diffractometer is used for collecting an X-ray diffraction pattern of the anode material K, the scanning speed is 4 degrees/min, and the scanning range is 10 degrees-80 degrees. And (3) making the positive electrode material K into a buckling capacitor for capacity test: adding the positive electrode material, conductive carbon black super P and a polyvinylidene fluoride (PVDF) adhesive into N-methylpyrrolidone (NMP) (the weight ratio of the lithium nickel cobalt manganese positive electrode material to the NMP is 2.1:1) according to the weight ratio of 90:05:05, fully mixing, stirring to form uniform sizing material, coating the sizing material on an aluminum foil current collector, drying and pressing to form a pole piece. Punching the pressed positive plate, weighing, baking, assembling the battery in a vacuum glove box, firstly putting the shell bottom of the button battery, putting a stainless steel spring plate on the shell bottom, dropwise adding electrolyte, then placing a negative metal lithium plate (Tianjin product, 99.9%), dropwise adding electrolyte again, then placing a PP/PE composite material diaphragm, dropwise adding electrolyte, then placing the positive plate, then covering the shell cover of the button battery, sealing, and using 1mol/L LiPF (lithium ion power) as electrolyte6/(EC: DMC ═ 1:1) solution. The experiment selects a Land test system, the charging and discharging voltage range is 3.0V-4.3V, and the capacity C of the experiment is testedK。
(2) The material was analyzed for X-ray diffraction pattern using Jade software to obtain the full width at half maximum D of the pattern after background subtraction (104)KRecorded in table one.
(3) Taking four test samples of the anode material A, B, C, D with the chemical general formula LiNi0.6Mn0.4O2. Collecting the X-ray diffraction pattern of the anode material by using an X-ray diffractometer,the scanning speed is 4-degree min, the scanning range is 10-80 degrees, and the total time is 17.5min.
(4) Analysis of the X-ray diffraction pattern of the material using Jade software to obtain the full width at half maximum D of the pattern of sample A, B, C, D after background subtraction (104)A、DB、DCAnd DDRecorded in table 1.
(5) Comparison Dk. + -. 0.02 and DA、DB、DCAnd DDThe size of (2). 0.02 corresponds to LiNi0.6Mn0.4O2The half-width amplitude modulation of the positive electrode material depends on the product quality. As can be seen from Table 1, DA、DBAnd DCAre all greater than Dk+0.02 may determine A, B that the capacity of C is abnormal, below the standard range. DDBetween DkAnd +/-0.02, judging that the capacity is normal.
(6) To verify the feasibility of the above scheme, four positive electrode materials A, B, C, D were made into a power button for capacity testing: adding the positive electrode material, conductive carbon black super P and a polyvinylidene fluoride (PVDF) adhesive into N-methylpyrrolidone (NMP) (the weight ratio of the lithium nickel cobalt manganese positive electrode material to the NMP is 2.1:1) according to the weight ratio of 90:05:05, fully mixing, stirring to form uniform sizing material, coating the sizing material on an aluminum foil current collector, drying and pressing to form a pole piece. Punching the pressed positive plate, weighing, baking, assembling the battery in a vacuum glove box, firstly placing the shell bottom of the button battery, placing a stainless steel elastic sheet on the shell bottom, dropwise adding electrolyte, then placing a negative metal lithium plate (Tianjin product, 99.9%), dropwise adding the electrolyte again, then placing a PP/PE composite material diaphragm, dropwise adding the electrolyte, then placing the positive plate, then covering a shell cover of the button battery, and sealing, wherein the used electrolyte is 1mol/L LiPF6/(EC: DMC 1:1) solution. The Land test system is selected in the experiment, and the charging and discharging voltage range is 3.0V-4.3V. Capacity C of four positive electrode materials A, B, C, DA、CB、CCAnd CDAs shown in table two, the capacity C of the positive electrode material K was determined by the sumKBy comparison, it can be seen that the capacity is the same as the full width at half maximum, where A, B and C do not meet the standard, and D isWithin the standard range.
(7) The half width D of the four anode materials A, B, C, DA、DB、DCAnd DDThe value x was substituted by y-222.9 x +221 (a functional relation equation was prepared by taking the XRD diffraction pattern and electrochemical capacity of 5 standard samples and reading the full width at half maximum of the crystal plane of the diffraction peak 104. by using the read full width at half maximum as the x-axis and the capacity as the y-axis and performing linear fitting), and the capacity C 'was obtained'A、C’B、C’CAnd C'D. The calculated capacity is very close to the actual capacity by comparing with the measured capacity of the corresponding anode material, and the scheme is found to be effective in measurement. Referring to fig. 1, fig. 1 is a graph showing a relationship between a full width at half maximum and a capacity of a positive electrode material prepared by an example.
Table 1: full width at half maximum of positive electrode material prepared by example 1
Table 2: measured capacity of the positive electrode material prepared by example 1
Table 3: capacity obtained by function fitting of the positive electrode material prepared in example 1
Example 2
(1) Taking a positive electrode material S with a chemical general formula of LiNi0.95Mn0.5O2And its capacity can be fed back to the standard level for producing a conventional batch. An X-ray diffractometer is used for collecting an X-ray diffraction pattern of the anode material S, the scanning speed is 4 degrees/min, and the scanning range is 10 degrees-80 degrees. And (3) making the positive electrode material K into a buckling capacitor for capacity test: the positive electrode materialAdding the conductive carbon black super P and a polyvinylidene fluoride (PVDF) adhesive into N-methyl pyrrolidone (NMP) (the weight ratio of the lithium nickel cobalt manganese positive electrode material to the NMP is 2.1:1) according to the weight ratio of 90:05:05, fully mixing, stirring to form a uniform sizing material, coating the uniform sizing material on an aluminum foil current collector, drying and pressing to form a pole piece. Punching the pressed positive plate, weighing, baking, assembling the battery in a vacuum glove box, firstly placing the shell bottom of the button battery, placing a stainless steel elastic sheet on the shell bottom, dropwise adding electrolyte, then placing a negative metal lithium plate (Tianjin product, 99.9%), dropwise adding the electrolyte again, then placing a PP/PE composite material diaphragm, dropwise adding the electrolyte, then placing the positive plate, then covering a shell cover of the button battery, and sealing, wherein the used electrolyte is 1mol/L LiPF6/(EC: DMC 1:1) solution. The experiment selects a Land test system, the charging and discharging voltage range is 3.0V-4.3V, and the capacity C of the experiment is testedS。
(2) The material was analyzed for X-ray diffraction pattern using Jade software to obtain the full width at half maximum D of the pattern after background subtraction (104)S。
(3) Taking four anode materials A, B, C, D with chemical general formula LiNi0.95Mn0.5O2. And an X-ray diffraction pattern of the anode material is acquired by using an X-ray diffractometer, the scanning speed is 4 degrees/min, the scanning range is 10 degrees-80 degrees, and the total time is 17.5min.
(4) Analysis of the X-ray diffraction pattern of the material using Jade software to obtain the full width at half maximum D of the pattern of sample A, B, C, D after background subtraction (104)A、DB、DCAnd DD。
(5) Comparison DS0.02 (empirical value, obtained by subtracting the standard Ds from the D value of the lower capacity limit material) and DA、DB、DCAnd DDThe size of (2). The range value of 0.02 is an empirical value and is obtained by subtracting the standard Ds from the D value of a normal sample with the capacity at the upper and lower limits, and the capacity at the upper and lower limits is set by the company quality. As can be seen from Table 1, DA、DBAnd DCAre all greater than DS+0.02 may determine A, B that the capacity of C is abnormal, below the standard range. DDBetween DsAnd +/-0.02, judging that the capacity is normal.
From the two examples, whether the performance of the material is qualified or not can be quickly and rapidly judged by acquiring XRD diffraction pattern information of a sample and analyzing the half height width of the crystal face of the sample, so that the time required for judging the qualified material by adopting electrochemical capacity is greatly reduced, and great convenience is brought to actual production.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method for rapidly characterizing the electrochemical capacity of a binary anode material for a lithium ion battery is characterized by comprising the following steps:
A) obtaining the XRD diffraction pattern of the binary anode material standard sample to obtain the full width at half maximum D of each diffraction peak1；
B) Obtaining the XRD diffraction pattern of the binary anode material test sample to obtain the full width at half maximum D of each diffraction peak of the test sample2；
C) Comparing the half-height width of the binary anode material test sample with that of the standard sample, if D1-c<D2<D1+ c, the capacity performance of the binary anode material test sample is normal; if D is2>D1+ c, the capacity of the binary anode material test sample is lower; d2<D1C, the capacity of the test sample of the binary anode material is higher, wherein the capacity of the test sample is D2Capacity of standard sample D1C, c is the amplitude modulation of the full width at half maximum of the standard sample, and is between 0 and 0.1.
2. A method for rapidly characterizing the electrochemical capacity of a binary anode material for a lithium ion battery is characterized by comprising the following steps:
a) obtaining the XRD diffraction pattern of the binary anode material standard sample to obtain the full width at half maximum D of each diffraction peak1Testing the standard capacity of the binary anode material standard sample;
b) obtaining the XRD diffraction pattern of the binary anode material test sample to obtain the full width at half maximum D of each diffraction peak of the test sample2；
c) Substituting the full width at half maximum of the test sample into a formulated function relation to obtain an electrochemical capacity pre-estimated value of the test sample; the general formula of the formulated functional relation is y ═ ax + b, wherein y is capacity, x is the full width at half maximum of the diffraction peak, a is the slope, and b is a constant.
3. The method of claim 1 or 2, wherein the binary positive electrode material has the formula LiNi1- xMxO2Wherein M is one or two selected from Al, Mn, Mg, Fe, Zn, Mo, Ti, Cr, Sn and Sr, and 0<x<1。
4. The method of claim 1 or 2, wherein the plane index of the diffraction peak comprises one or more of (003), (104), (006), (012), (008), and (110).
5. The method of claim 2, wherein the method of testing the standard capacity of the standard sample of binary positive electrode material is:
and manufacturing the binary anode material standard sample into a lithium ion button half cell, and measuring the standard capacity.
6. The method according to claim 5, wherein the lithium-ion button half-cell is assembled by a positive plate, a negative plate, an electrolyte, a diaphragm and a shell; the positive plate is prepared from the binary positive material.
7. The method of claim 2, wherein the proposed functional relationship is derived by:
collecting more than three standard sample XRD diffraction patterns and electrochemical capacity, and reading the full width at half maximum of diffraction peak; and linear fitting is carried out by taking the read full width at half maximum as an x axis and the capacity as a y axis to obtain a drawn functional relation.
8. The method according to claim 1 or 2, wherein the XRD diffraction pattern of the standard sample of the binary positive electrode material or the XRD diffraction pattern of the test sample of the binary positive electrode material is obtained at a scanning speed of 0.2 ° to 5 °/min in a scanning range of 10 ° to 80 °.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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