CN111370687A - Preparation method of lithium ion battery - Google Patents

Preparation method of lithium ion battery Download PDF

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CN111370687A
CN111370687A CN202010201085.5A CN202010201085A CN111370687A CN 111370687 A CN111370687 A CN 111370687A CN 202010201085 A CN202010201085 A CN 202010201085A CN 111370687 A CN111370687 A CN 111370687A
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active material
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CN111370687B (en
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谈益
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Jiangsu Zhongyi Hechuang Intelligent Technology Co.,Ltd.
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谈益
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    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
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    • H—ELECTRICITY
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    • H01M4/04—Processes of manufacture in general
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    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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Abstract

The invention provides a preparation method of a lithium ion battery, wherein the lithium ion battery comprises a positive electrode and a negative electrode, and an active substance of the positive electrode is LiNi0.35Co0.25Mn0.4O2Wherein D10 is 1.3-1.4 μm, D50 is 2.4-2.5 μm, and D90 is 3.3-3.4 μm; the negative active material is natural graphite, wherein D10 is 1.8-1.9 μm, D50 is 3.1-3.2 μm, and D90 is 4.2-4.3 μm; the preparation method comprises the steps of screening the positive active substance, wherein the aperture of the screen is 2-2.2 mu m, and obtaining a first positive active substance and a second positive active substance; then mixing the first positive electrode active substance and the second positive electrode active substance according to different mass ratios to obtain a first positive electrode slurry and a second positive electrode slurry, and sequentially coating the first positive electrode slurry and the second positive electrode slurry on a current collector and drying to obtain the positive electrode; mixing a first negative electrode active substance and a second negative electrode active substance to obtain a first negative electrode slurry and a second negative electrode slurry, and sequentially coating the first negative electrode slurry and the second negative electrode slurry on a current collector and drying to obtain the negative electrode; the preparation method also comprises the steps of assembling the anode, the diaphragm and the cathode into a battery, injecting liquid and forming to obtain the battery.

Description

Preparation method of lithium ion battery
Technical Field
The invention relates to a preparation method of a lithium ion battery.
Background
The lithium ion battery has the advantages of high voltage, high specific energy, light weight, small volume, small self-discharge, long service life and the like, is one of the battery systems with the best comprehensive performance at present, and is widely applied to high-energy portable electronic equipment. In the civil field, lithium ion batteries are rapidly expanding from the 3C field (mobile electronic devices, smart phones, notebook computers, and the like) to the energy transportation field, including electric vehicles, power grid peak shaving, solar energy, wind power station power storage, and the like. The nickel-cobalt-manganese ternary positive electrode material is used as an important lithium ion battery positive electrode material, and compared with lithium cobaltate, lithium nickelate and lithium manganate, the nickel-cobalt-manganese ternary positive electrode material has wide attention in academic circles and industrial circles due to the advantages of good cycle performance, large discharge capacity, good thermal stability, low cost, relatively stable structure and the like.
Disclosure of Invention
The invention provides a preparation method of a lithium ion battery, wherein the lithium ion battery comprises a positive electrode and a negative electrode, and an active substance of the positive electrode is LiNi0.35Co0.25Mn0.4O2Wherein D10 is 1.3-1.4 μm, D50 is 2.4-2.5 μm, and D90 is 3.3-3.4 μm; the negative active material is natural graphite, wherein D10 is 1.8-1.9 μm, D50 is 3.1-3.2 μm, and D90 is 4.2-4.3 μm; the preparation method comprises the steps of screening the positive active substance, wherein the aperture of the screen is 2-2.2 mu m, and obtaining a first positive active substance and a second positive active substance; then mixing the first positive electrode active substance and the second positive electrode active substance according to different mass ratios to obtain a first positive electrode slurry and a second positive electrode slurry, and sequentially coating the first positive electrode slurry and the second positive electrode slurry on a current collector and drying to obtain the positive electrode; sieving the negative electrode active material, wherein the mesh diameter is 3.4-3.6 μm to obtain a first negative electrode active material and a second negative electrodeAn active substance; then mixing the first negative electrode active substance and the second negative electrode active substance according to different mass ratios to obtain a first negative electrode slurry and a second negative electrode slurry, and sequentially coating the first negative electrode active substance and the second negative electrode active substance on a current collector and drying to obtain the negative electrode; the preparation method also comprises the steps of assembling the anode, the diaphragm and the cathode into a battery, injecting liquid and forming to obtain the battery.
The specific scheme is as follows:
a preparation method of a lithium ion battery comprises a positive electrode and a negative electrode, wherein the positive electrode active material is LiNi0.35Co0.25Mn0.4O2Wherein D10 is 1.3-1.4 μm, D50 is 2.4-2.5 μm, and D90 is 3.3-3.4 μm; the negative active material is natural graphite, wherein D10 is 1.8-1.9 μm, D50 is 3.1-3.2 μm, and D90 is 4.2-4.3 μm; the preparation method comprises the following steps:
1) sieving the positive active material, wherein the aperture of the sieve is 2-2.2 mu m, collecting the material on the sieve to obtain a first positive active material, and collecting the material under the sieve to obtain a second positive active material;
2) sieving the negative electrode active material, wherein the aperture of the sieve is 3.4-3.6 mu m, collecting the material on the sieve to obtain a first negative electrode active material, and collecting the material under the sieve to obtain a second negative electrode active material;
3) preparing a first positive electrode active material slurry, wherein the solid content of the slurry is 60-65%, and the active material: adhesive: the conductive agent is 100:4-6: 4-6;
4) preparing a second positive electrode active material slurry, wherein the solid content of the slurry is 50-55%, and the active material: adhesive: the conductive agent is 100:4-6: 4-6;
5) preparing a first negative electrode active material slurry, wherein the solid content of the slurry is 60-65%, and the active material: adhesive: the conductive agent is 100:4-6: 4-6;
6) preparing a second negative electrode active material slurry, wherein the solid content of the slurry is 50-55%, and the active material: adhesive: the conductive agent is 100:4-6: 4-6;
7) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 70:30-85: 15; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurries to be 50-52% so as to obtain a first positive electrode slurry;
8) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 15:85-30: 70; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurries to be 50-52% so as to obtain a first positive electrode slurry;
9) according to the first negative electrode active material: mixing the second negative electrode active material at a ratio of 8:2 to 9: 1; adding a solvent into the first negative electrode active material slurry and the second negative electrode active material slurry to adjust the solid content of the slurry to be 50-52% to obtain first negative electrode slurry;
10) adding a solvent into the second active material slurry to adjust the solid content of the slurry to be 50-52% to serve as second negative electrode slurry;
11) sequentially coating first positive electrode slurry and second positive electrode slurry on a positive electrode current collector, and drying to obtain the positive electrode; sequentially coating first negative electrode slurry and second negative electrode slurry on a negative electrode current collector, and drying to obtain a negative electrode;
12) and laminating the anode, the diaphragm and the cathode, filling the laminated anode, diaphragm and cathode into a battery shell, injecting liquid and forming to obtain the battery.
Further, the coating thickness ratio of the first positive electrode slurry to the second positive electrode slurry is 6:4-7: 3; the coating thickness ratio of the first negative electrode slurry to the second negative electrode slurry is 6:4-7: 3.
Further, the electrolyte comprises ethyl carbonate and propyl carbonate as organic solvents, and vinylene carbonate and trimethyl phosphate as additives.
Further, the volume ratio of the ethyl carbonate to the propyl carbonate is 2:1-1: 2.
Further, the content of the vinylene carbonate is 2.5-3 times of that of the trimethyl phosphate.
Further, the content of the vinylene carbonate is 2.8 times of that of the trimethyl phosphate.
Further, the formation process comprises constant voltage formation in a voltage range of 3.35-3.4V.
Further, the positive electrode of the lithium ion battery is prepared by the method.
The invention has the following beneficial effects:
1) against LiNi0.35Co0.25Mn0.4O2In a battery system including a positive electrode and a graphite negative electrode, researchers have developed a specific electrode structure by limiting LiNi0.35Co0.25Mn0.4O2The particle size ranges of the positive electrode active material layer and the graphite active material layer, so that the active material layer with a specific structure is designed, the stability of the electrode active material layer can be effectively improved, and the cycle life of the battery can be prolonged.
2) Through numerous experiments, researchers find that the combination of vinylene carbonate and trimethyl phosphate can effectively improve the cycle performance of the lithium manganate battery, and the specific mechanism is not clear, but experimental data show that when two additives are used together, the cycle performance of the battery is remarkably improved and is obviously higher than that of a single-addition mode;
3) the other invention point of the invention is that the constant voltage formation under the specific voltage can effectively improve the cycle performance of the battery, and the principle of the invention is probably that the additive of the invention can make the SEI formation speed more stable under the voltage.
Detailed Description
The present invention will be described in more detail below with reference to specific examples, but the scope of the present invention is not limited to these examples.
The positive electrode active material is LiNi0.35Co0.25Mn0.4O2(ii) a The negative active material is natural graphite; the particle size distribution of the positive and negative electrodes is shown in table 1; the solvent of the electrolyte is PC + EC with the volume ratio of 1: 1; the electrolyte salt is lithium hexafluorophosphate with the concentration of 1mol/L, and the additives are vinylene carbonate and trimethyl phosphate, wherein the content of trimethyl phosphate is 1 volume percent, and the content of vinylene carbonate is 2.8 volume percent. The positive electrode solvent is NMP, the positive electrode binder is PVDF, the negative electrode solvent is deionized water, the negative electrode binder is SBR, and the conductive agent is acetylene black.
TABLE 1
Figure BDA0002419404220000041
Example 1
1) Sieving the positive active material, wherein the aperture of the sieve is 2 mu m, collecting the material on the sieve to obtain a first positive active material, and collecting the material under the sieve to obtain a second positive active material;
2) sieving the negative electrode active material, wherein the aperture of the sieve is 3.4 mu m, collecting the material on the sieve to obtain a first negative electrode active material, and collecting the material under the sieve to obtain a second negative electrode active material;
3) preparing a first positive electrode active material slurry having a solid content of 60%, wherein the active material: adhesive: the conductive agent is 100:4: 4;
4) preparing a second positive electrode active material slurry having a solid content of 50%, wherein the active material: adhesive: the conductive agent is 100:4: 4;
5) preparing a first negative electrode active material slurry having a solid content of 60%, wherein the active material: adhesive: the conductive agent is 100:4: 4;
6) preparing a second negative electrode active material slurry having a solid content of 50%, wherein the active material: adhesive: the conductive agent is 100:4: 4;
7) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 70: 30; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurry to 50% so as to obtain a first positive electrode slurry;
8) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 15: 85; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurry to 50% so as to obtain a first positive electrode slurry;
9) according to the first negative electrode active material: mixing the second negative electrode active material at a ratio of 8: 2; adding a solvent to adjust the solid content of the slurry to 50% to obtain a first cathode slurry;
10) adding a solvent into the second active material slurry to adjust the solid content of the slurry to be 50% to serve as second negative electrode slurry;
11) sequentially coating first positive electrode slurry and second positive electrode slurry on a positive electrode current collector, and drying to obtain the positive electrode; sequentially coating first negative electrode slurry and second negative electrode slurry on a negative electrode current collector, and drying to obtain a negative electrode; wherein the thickness of the positive electrode active material layer and the negative electrode active material layer is 50 μm on one side, and the coating thickness ratio of the first positive electrode slurry to the second positive electrode slurry is 6: 4; the coating thickness ratio of the first negative electrode slurry to the second negative electrode slurry is 7: 3;
12) stacking the positive electrode, the separator and the negative electrode, and filling the stacked positive electrode, separator and negative electrode into a battery shell;
13) injecting liquid;
14) charging to 3.38V at 0.05C, and then charging at constant voltage until the charging current is less than 0.01C; and then charging to 4.2V at a constant current of 0.1C, and then charging and discharging for 3 times at a constant current of 0.2C from 4.2V to 2.7V to obtain the battery.
Example 2
1) Sieving the positive active material, wherein the aperture of the sieve is 2.2 mu m, collecting the material on the sieve to obtain a first positive active material, and collecting the material under the sieve to obtain a second positive active material;
2) sieving the negative electrode active material, wherein the aperture of the sieve is 3.6 mu m, collecting the material on the sieve to obtain a first negative electrode active material, and collecting the material under the sieve to obtain a second negative electrode active material;
3) preparing a first positive electrode active material slurry having a solid content of 65%, wherein the active material: adhesive: the conductive agent is 100:6: 6;
4) preparing a second positive electrode active material slurry having a solid content of 55%, wherein the active material: adhesive: the conductive agent is 100:6: 6;
5) preparing a first negative electrode active material slurry having a solid content of 65%, wherein the active material: adhesive: the conductive agent is 100:6: 6;
6) preparing a second negative electrode active material slurry having a solid content of 55%, wherein the active material: adhesive: the conductive agent is 100:6: 6;
7) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 85: 15; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurry to 52% to obtain a first positive electrode slurry;
8) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 30: 70; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurry to 52% to obtain a first positive electrode slurry;
9) according to the first negative electrode active material: mixing the second negative electrode active material at a ratio of 9: 1; adding a solvent to adjust the solid content of the slurry to 52% to obtain first negative electrode slurry;
10) adding a solvent into the second active material slurry to adjust the solid content of the slurry to be 52 percent, and taking the slurry as second negative electrode slurry;
11) sequentially coating first positive electrode slurry and second positive electrode slurry on a positive electrode current collector, and drying to obtain the positive electrode; sequentially coating first negative electrode slurry and second negative electrode slurry on a negative electrode current collector, and drying to obtain a negative electrode; wherein the thickness of the positive electrode active material layer and the negative electrode active material layer is 50 μm on one side, and the coating thickness ratio of the first positive electrode slurry to the second positive electrode slurry is 6: 4; the coating thickness ratio of the first negative electrode slurry to the second negative electrode slurry is 7: 3;
12) stacking the positive electrode, the separator and the negative electrode, and filling the stacked positive electrode, separator and negative electrode into a battery shell;
13) injecting liquid;
14) charging to 3.38V at 0.05C, and then charging at constant voltage until the charging current is less than 0.01C; and then charging to 4.2V at a constant current of 0.1C, and then charging and discharging for 3 times at a constant current of 0.2C from 4.2V to 2.7V to obtain the battery.
Example 3
1) Sieving the positive active material, wherein the aperture of the sieve is 2.2 mu m, collecting the material on the sieve to obtain a first positive active material, and collecting the material under the sieve to obtain a second positive active material;
2) sieving the negative electrode active material, wherein the aperture of the sieve is 3.5 mu m, collecting the material on the sieve to obtain a first negative electrode active material, and collecting the material under the sieve to obtain a second negative electrode active material;
3) preparing a first positive electrode active material slurry having a solid content of 62%, wherein the active material: adhesive: the conductive agent is 100:5: 5;
4) preparing a second positive electrode active material slurry having a solid content of 52%, wherein the active material: adhesive: the conductive agent is 100:5: 5;
5) preparing a first negative electrode active material slurry having a solid content of 62%, wherein the active material: adhesive: the conductive agent is 100:5: 5;
6) preparing a second negative electrode active material slurry having a solid content of 52%, wherein the active material: adhesive: the conductive agent is 100:5: 5;
7) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 80: 30; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurry to 51% so as to obtain a first positive electrode slurry;
8) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 20: 80; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurry to 51% so as to obtain a first positive electrode slurry;
9) according to the first negative electrode active material: mixing the second negative electrode active material at a ratio of 8: 2; adding a solvent into the first negative electrode active material slurry and the second negative electrode active material slurry to adjust the solid content of the slurry to 51% to obtain a first negative electrode slurry;
10) adding a solvent into the second active material slurry to adjust the solid content of the slurry to be 51 percent, and taking the slurry as second negative electrode slurry;
11) sequentially coating first positive electrode slurry and second positive electrode slurry on a positive electrode current collector, and drying to obtain the positive electrode; sequentially coating first negative electrode slurry and second negative electrode slurry on a negative electrode current collector, and drying to obtain a negative electrode; wherein the thickness of the positive electrode active material layer and the negative electrode active material layer is 50 μm on one side, and the coating thickness ratio of the first positive electrode slurry to the second positive electrode slurry is 6: 4; the coating thickness ratio of the first negative electrode slurry to the second negative electrode slurry is 7: 3;
12) stacking the positive electrode, the separator and the negative electrode, and filling the stacked positive electrode, separator and negative electrode into a battery shell;
13) injecting liquid;
14) charging to 3.38V at 0.05C, and then charging at constant voltage until the charging current is less than 0.01C; and then charging to 4.2V at a constant current of 0.1C, and then charging and discharging for 3 times at a constant current of 0.2C from 4.2V to 2.7V to obtain the battery.
Comparative example 1
1) Sieving the positive active material, wherein the aperture of the sieve is 3 mu m, collecting the material on the sieve to obtain a first positive active material, and collecting the material under the sieve to obtain a second positive active material;
2) sieving the negative electrode active material, wherein the aperture of the sieve is 2 mu m, collecting the material on the sieve to obtain a first negative electrode active material, and collecting the material under the sieve to obtain a second negative electrode active material;
3) preparing a first positive electrode active material slurry having a solid content of 62%, wherein the active material: adhesive: the conductive agent is 100:5: 5;
4) preparing a second positive electrode active material slurry having a solid content of 52%, wherein the active material: adhesive: the conductive agent is 100:5: 5;
5) preparing a first negative electrode active material slurry having a solid content of 62%, wherein the active material: adhesive: the conductive agent is 100:5: 5;
6) preparing a second negative electrode active material slurry having a solid content of 52%, wherein the active material: adhesive: the conductive agent is 100:5: 5;
7) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 80: 30; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurry to 51% so as to obtain a first positive electrode slurry;
8) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 20: 80; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurry to 51% so as to obtain a first positive electrode slurry;
9) according to the first negative electrode active material: mixing the second negative electrode active material at a ratio of 8: 2; adding a solvent into the first negative electrode active material slurry and the second negative electrode active material slurry to adjust the solid content of the slurry to 51% to obtain a first negative electrode slurry;
10) adding a solvent into the second active material slurry to adjust the solid content of the slurry to be 51 percent, and taking the slurry as second negative electrode slurry;
11) sequentially coating first positive electrode slurry and second positive electrode slurry on a positive electrode current collector, and drying to obtain the positive electrode; sequentially coating first negative electrode slurry and second negative electrode slurry on a negative electrode current collector, and drying to obtain a negative electrode; wherein the thickness of the positive electrode active material layer and the negative electrode active material layer is 50 μm on one side, and the coating thickness ratio of the first positive electrode slurry to the second positive electrode slurry is 6: 4; the coating thickness ratio of the first negative electrode slurry to the second negative electrode slurry is 7: 3;
12) stacking the positive electrode, the separator and the negative electrode, and filling the stacked positive electrode, separator and negative electrode into a battery shell;
13) injecting liquid;
14) charging to 3.38V at 0.05C, and then charging at constant voltage until the charging current is less than 0.01C; and then charging to 4.2V at a constant current of 0.1C, and then charging and discharging for 3 times at a constant current of 0.2C from 4.2V to 2.7V to obtain the battery.
Comparative example 2
1) Preparing positive electrode slurry, wherein the solid content of the slurry is 52%, and the content of active substances: adhesive: the conductive agent is 100:5: 5;
2) preparing a negative electrode slurry, wherein the solid content of the slurry is 52%, and the active material: adhesive: the conductive agent is 100:5: 5;
3) coating anode slurry on an anode current collector, and drying to obtain the anode; coating negative electrode slurry on a negative electrode current collector, and drying to obtain the negative electrode; wherein the thickness of the positive electrode active material layer and the negative electrode active material layer is 50 μm on one side;
4) stacking the positive electrode, the separator and the negative electrode, and filling the stacked positive electrode, separator and negative electrode into a battery shell;
5) injecting liquid;
6) charging to 3.38V at 0.05C, and then charging at constant voltage until the charging current is less than 0.01C; and then charging to 4.2V at a constant current of 0.1C, and then charging and discharging for 3 times at a constant current of 0.2C from 4.2V to 2.7V to obtain the battery.
Comparative example 3
The electrolyte contained no additive, and the other processes were the same as in example 3.
Comparative example 4
The electrolyte contained no vinylene carbonate, and the other processes were the same as in example 3.
Comparative example 5
The electrolyte contained no trimethyl phosphate, and the other processes were the same as in example 3.
Comparative example 6
The electrolyte contained vinylene carbonate and trimethyl phosphate, wherein the trimethyl phosphate content was 2 vol% and the vinylene carbonate content was 2.8 vol%, and the other processes were the same as in example 3.
Comparative example 7
After the liquid injection in the step 13, the battery is charged to 4.2V at a constant current of 0.1C, and then charged and discharged for 3 times at a constant current of 0.2C from 4.2V to 2.7V, so that the battery is obtained, the constant voltage formation of 3.38V is omitted, and other processes are the same as those in the embodiment 3.
Test and results
The batteries of examples 1-3 and comparative examples 1-7 were cycled 200 times at a rate of 0.5C, and the capacity retention rates of the batteries were recorded. The results are shown in table 2, and it can be seen from table 2 that the aperture range of the mesh, the structural arrangement of the electrodes, and the selection of additives, and the constant voltage formation of a specific voltage range all have great influence on the cycle performance of the battery.
TABLE 2
Figure BDA0002419404220000091
Figure BDA0002419404220000101
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.

Claims (8)

1. A preparation method of a lithium ion battery comprises a positive electrode and a negative electrode, wherein an active substance of the positive electrode is LiNi0.35Co0.25Mn0.4O2Wherein D10 is 1.3-1.4 μm, D50 is 2.4-2.5 μm, and D90 is 3.3-3.4 μm; the negative active material is natural graphite, wherein D10 is 1.8-1.9 μm, D50 is 3.1-3.2 μm, and D90 is 4.2-4.3 μm; the preparation method comprises the following steps:
1) sieving the positive active material, wherein the aperture of the sieve is 2-2.2 mu m, collecting the material on the sieve to obtain a first positive active material, and collecting the material under the sieve to obtain a second positive active material;
2) sieving the negative electrode active material, wherein the aperture of the sieve is 3.4-3.6 mu m, collecting the material on the sieve to obtain a first negative electrode active material, and collecting the material under the sieve to obtain a second negative electrode active material;
3) preparing a first positive electrode active material slurry, wherein the solid content of the slurry is 60-65%, and the active material: adhesive: the conductive agent is 100:4-6: 4-6;
4) preparing a second positive electrode active material slurry, wherein the solid content of the slurry is 50-55%, and the active material: adhesive: the conductive agent is 100:4-6: 4-6;
5) preparing a first negative electrode active material slurry, wherein the solid content of the slurry is 60-65%, and the active material: adhesive: the conductive agent is 100:4-6: 4-6;
6) preparing a second negative electrode active material slurry, wherein the solid content of the slurry is 50-55%, and the active material: adhesive: the conductive agent is 100:4-6: 4-6;
7) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 70:30-85: 15; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurries to be 50-52% so as to obtain a first positive electrode slurry;
8) according to the first positive electrode active material: mixing the second positive electrode active material at a ratio of 15:85-30: 70; adding a solvent into the first positive electrode active material slurry and the second positive electrode active material slurry to adjust the solid content of the slurries to be 50-52% so as to obtain a first positive electrode slurry;
9) according to the first negative electrode active material: mixing the second negative electrode active material at a ratio of 8:2 to 9: 1; adding a solvent into the first negative electrode active material slurry and the second negative electrode active material slurry to adjust the solid content of the slurry to be 50-52% to obtain first negative electrode slurry;
10) adding a solvent into the second active material slurry to adjust the solid content of the slurry to be 50-52% to serve as second negative electrode slurry;
11) sequentially coating first positive electrode slurry and second positive electrode slurry on a positive electrode current collector, and drying to obtain the positive electrode; sequentially coating first negative electrode slurry and second negative electrode slurry on a negative electrode current collector, and drying to obtain a negative electrode;
12) and laminating the anode, the diaphragm and the cathode, filling the laminated anode, diaphragm and cathode into a battery shell, injecting liquid and forming to obtain the battery.
2. The production method according to the preceding claim, wherein the coating thickness ratio of the first positive electrode paste to the second positive electrode paste is 6:4 to 7: 3; the coating thickness ratio of the first negative electrode slurry to the second negative electrode slurry is 6:4-7: 3.
3. The method according to the preceding claim, wherein the electrolyte comprises ethyl carbonate and propyl carbonate as organic solvents and vinylene carbonate and trimethyl phosphate as additives.
4. The process according to the preceding claim, wherein the volume ratio of ethyl carbonate to propyl carbonate is from 2:1 to 1: 2.
5. The method according to the preceding claim, wherein the vinylene carbonate content is 2.5-3 times higher than the trimethyl phosphate content.
6. The method according to the preceding claim, wherein the vinylene carbonate content is 2.8 times higher than the trimethyl phosphate content.
7. The method of claim, wherein the formation process comprises a constant voltage formation within a voltage range of 3.35-3.4V.
8. A lithium ion battery, the positive electrode being prepared by the method of any one of claims 1 to 7.
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