CN112397766A - High-voltage lithium ion battery and preparation method thereof - Google Patents
High-voltage lithium ion battery and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high-voltage lithium ion battery and a preparation method thereof, wherein a positive electrode comprises a positive active material, and the positive active material comprises two compounds; wherein the chemical formula of the compound 1 is LixCo1‑yMeyO2；0.95≤x≤1.05，0≤y≤0.1；Me＝(Mz1Nz2)，0≤z1≤1，0≤z2 is less than or equal to 1, M and N are same or different and are independently selected from Al, Mg, Ti, Zr, Co, Ni, Mn, Y, La and Sr; the chemical formula of the compound 2 is Li2Ni1‑aDaO2(ii) a A is more than or equal to 0 and less than or equal to 0.1; d is at least one selected from Al, Mg, Ti, Zn, Fe, Co and Mn; through a high-voltage lithium cobalt oxide compound with stable structure and Li with doping coating2NiO2The compounds are mixed according to a certain proportion, and are applied to a high-voltage lithium ion battery system, the first efficiency of the negative electrode of the graphite material and silicon material mixing type is obviously improved, the lithium ion battery formed by combining the materials can obviously improve the volume energy density, and meanwhile, the cycle performance of the lithium ion battery material is improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery research, and particularly relates to a high-voltage lithium ion battery and a preparation method thereof.
Background
Since the lithium ion battery is commercialized for the first time by Sony corporation in the last 90 th century, the lithium ion battery enters the rapid development period, the lithium ion secondary battery gradually occupies most markets of the battery industry by virtue of the unique advantages of high capacity, long cycle life, no memory effect, high energy density, cleanness, no pollution and the like, and the high-voltage digital lithium ion battery is mostly applied to the 3C consumption digital field of mobile phones, notebook computers and the like at present, has absolute performance advantages and is reflected in the aspect of volume energy density. However, in recent years, the volume energy density of lithium ion batteries has rapidly reached the limit of materials, and the application of lithium ion batteries in the field of high-voltage digital batteries is directly limited.
With the portable and portable demands of consumers for mobile phones or notebooks, the high voltage lithium ion battery with high volume energy density becomes a development trend, and the volume energy density of the lithium cobaltate system is increased from 600-; for the anode material, the charge cut-off voltage of the lithium cobaltate material is continuously improved, and the gram capacity of the lithium cobaltate material is continuously increased, so that the lithium cobaltate material contributes to volume energy density; for the negative artificial graphite, the theoretical gram capacity is 372mAh/g, and the simple graphite negative material is difficult to meet the requirement of volume energy density, so more and more researchers pay attention to silicon series negative materials with high gram capacity, such as Si, SiC, SiOx materials and the like, but the negative material has the defect of low first charge and discharge efficiency.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-voltage lithium ion battery and a preparation method thereof, wherein the method utilizes Li through a chemical lithium supplementing method2NiO2High charge capacity of the material, and the material is used as a positive electrode lithium supplement material for Si, SiC and SiOxThe lithium is supplemented chemically by the materials, so that the first charging efficiency and energy density of the high-capacity cathode material can be effectively improved, and the cycle performance of the lithium ion battery material is improved, and the lithium ion battery material is applied to a high-voltage lithium ion battery.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high voltage lithium ion battery comprising a positive electrode, a negative electrode, a nonaqueous electrolytic solution, and a separator:
the positive electrode comprises a positive electrode active material, and the positive electrode active material contains two compounds; wherein the content of the first and second substances,
the chemical formula of the compound 1 is LixCo1-yMeyO2；0.95≤x≤1.05，0≤y≤0.1；Me＝(Mz1Nz2) 0. ltoreq. z 1. ltoreq.1, 0. ltoreq. z 2. ltoreq.1, M and N are identical or different and are selected independently of one another from the group consisting of Al, Mg, Ti, Zr, Co, Ni, Mn, Y, La, Sr;
the chemical formula of the compound 2 is Li2Ni1-aDaO2(ii) a A is more than or equal to 0 and less than or equal to 0.1; d is at least one selected from Al, Mg, Ti, Zn, Fe, Co and Mn;
the negative electrode includes a negative active material including a graphite material and a silicon material.
According to the present invention, the separator is a separator known in the art, for example, a separator for a commercial lithium ion battery known in the art.
According to the present invention, the graphite material is, for example, at least one of artificial graphite, natural graphite, and the like.
According to the invention, the silicon material is, for example, Si, SiC and SiOx(0<x<2) One or more of (a).
According to the invention, the silicon material accounts for 0-50 wt% of the total mass of the graphite material and the silicon material, and is not 0.
Illustratively, defining Q as the mass mixing ratio of silicon material and graphite material, Q being the mass of silicon material/(mass of graphite material + mass of silicon material), 0< Q ≦ 0.5, preferably, such as 0< Q ≦ 0.15. For example, 0.06 and 0.1.
According to the present invention, the nonaqueous electrolytic solution is a conventional electrolytic solution known in the art, and the solvent contains ethylene carbonate (abbreviated as EC), diethyl carbonate (abbreviated as DEC), propylene carbonate (abbreviated as PC), fluoroethylene carbonate (abbreviated as FEC), and the like.
Further, the chemical formula of the compound 1 is LixCo1-yMeyO2；0.95≤x≤1.05，0≤y≤0.1；Me＝(Mz1Nz2) Z1 is more than or equal to 0 and less than or equal to 1, z2 is more than or equal to 0 and less than or equal to 1, M and N are the same or different and are independently selected from Al, Mg and Ti, the content of Al is more than or equal to 1500ppm, and the sum of the contents of Mg and Ti<5000ppm。
Further, the compound 1 is prepared by a high-temperature solid phase method known in the art.
In the invention, the compound 1 has a stable structure and good cycle performance, and the normal-temperature cycle performance can meet the capacity retention rate of more than 90% for 100 times. The compound 1 has high voltage resistance, and the charge cut-off voltage of the compound is 4.4-4.5V (for a graphite cathode).
Further, the chemical formula of the compound 2 is Li2Ni1-aDaO2(ii) a A is more than or equal to 0 and less than or equal to 0.1; d is at least one selected from Al, Mg and Ti.
Further, the compound 2 is prepared by the following method:
grinding a lithium source, a nickel source and a metal D raw material in a protective atmosphere, and then sintering at a high temperature to obtain a compound 2.
Illustratively, the number of times of the high-temperature sintering is performed according to the kind of the metal D source, for example, when the kind of the metal D source is n, the number of times of the high-temperature sintering may be 1 to n times.
Wherein the lithium source is, for example, Li2O or LiOH; sources of nickel, for example NiO or Ni (OH)2。
Wherein the temperature of the high-temperature sintering is 600-800 ℃, and the time of the high-temperature sintering is 6-16 h.
Wherein the metal D source is oxide or salt compound corresponding to Al, Mg, Ti, Zn, Fe, Co, Mn, Zr, etc., such as Al2O3、MgO、ZrO2、ZrCO3And (c) a compound such as a quaternary ammonium compound.
According to the present invention, the compound 2 accounts for 0 to 50 wt% of the total mass of the compound 1 and the compound 2, and is not 0. For example, 1 wt%, 2 wt%, 5 wt%, 8 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%.
Illustratively, defining P as the mass mixing ratio of compound 1 and compound 2, where P is the mass of compound 2/(mass of compound 1 + mass of compound 2), 0< P ≦ 0.5, preferably 0< P ≦ 0.2. For example, 0.03, 0.05, 0.1, 0.2.
According to the invention, the charge cut-off voltage of the lithium ion battery system is 4.4-4.5V.
In the present invention, the chemical formula Li of the compound 1xCo1-yMeyO2The discharge capacity of the button cell assembled by the material at the charge-discharge capacity of 0.1C is 182-195mAh/g (the charge-discharge cut-off voltage is 3.0-4.5V), and the full cell discharge capacity of 0.2C g formed by the material and the negative electrode is 169-195mAh/g (the charge cut-off voltage is 4.4-4.5V).
In the present invention, the chemical formula Li of the compound 22Ni1-aDaO2The cathode of the button cell made of the material is a metal Li sheet, and the first charge capacity is more than or equal to 300mAh/g and the discharge capacity is less than or equal to 150mAh/g at the charge-discharge cut-off voltage of 3.0-4.4V and the multiplying power of 0.1C.
The invention also provides a preparation method of the high-voltage lithium ion battery, which comprises the step of assembling the positive electrode, the negative electrode, the non-aqueous electrolyte and the diaphragm into the lithium ion battery.
According to the invention, the method comprises the following steps:
mixing a positive electrode active substance with a binder, a conductive agent and a solvent to prepare positive electrode slurry, coating the positive electrode slurry on the surface of a positive electrode current collector, rolling and drying to prepare a positive electrode plate;
mixing a negative electrode active material, a binder, a conductive agent and a solvent to prepare a negative electrode slurry, coating the negative electrode slurry on the surface of a negative electrode current collector, rolling and drying to prepare a negative electrode plate;
and assembling the positive pole piece, the negative pole piece and the diaphragm into a lithium ion battery, wherein electrolyte is injected.
Illustratively, the method comprises the steps of:
subjecting LiCo to0.985Al0.009Mg0.004Ti0.002O2And Li2Ni0.995Al0.005O2The positive active material consists of 94% to 6% of the two materials by weight; next, a positive electrode active material, PVDF as a binder, and carbon nanotubes as a conductive material were mixed at a weight ratio of 97%: 1.5%: 1.5%, and the mixture was dispersed in NMP, and after stirring by double planets, a positive electrode slurry was obtained. The slurry was coated on an aluminum foil current collector having a thickness of 12 μm, followed by rolling and drying to prepare a current collector with added Li2Ni0.995Al0.005O2Compound and LiCo0.985Al0.009Mg0.004Ti0.002O2The high voltage positive electrode plate.
Mixing graphite and SiOx(0<x<2) A negative active material consisting of 94% to 6% by weight; mixing a negative electrode active material, styrene diene rubber (SBR), sodium carboxymethylcellulose and conductive carbon black in a weight ratio of 94% to 3% to 2% to 1%, dispersing the mixture in water, and mixing by double planets to obtain negative electrode slurry. Coating the slurry on a copper current collector, and then rolling and drying to prepare the copper current collectorA hybrid negative pole piece with two negative pole materials.
And assembling the prepared positive pole piece, negative pole piece and diaphragm into a lithium ion battery, and injecting a non-aqueous electrolyte.
Among them, the nonaqueous electrolytic solution used is a conventional electrolytic solution known in the art, and the solvent contains ethylene carbonate (abbreviated as EC), diethyl carbonate (abbreviated as DEC), propylene carbonate (abbreviated as PC), fluoroethylene carbonate (abbreviated as FEC), and the like.
The invention has the beneficial effects that:
the invention provides a high-voltage lithium ion battery and a preparation method thereof, and a high-voltage lithium cobaltate compound with a stable structure and doped coated Li are used2NiO2The compounds are mixed according to a certain proportion, and are applied to a high-voltage lithium ion battery system, the first efficiency of the negative electrode of the graphite material and silicon material mixing type is obviously improved, the lithium ion battery formed by combining the materials can obviously improve the volume energy density, and meanwhile, the cycle performance of the lithium ion battery material is improved.
Drawings
Fig. 1 is a cycle performance curve of the pouch full cell assembled from example 1 and comparative example 1.
Fig. 2 is a first charge-discharge curve of the assembled button cell of comparative example 2.
Detailed Description
The preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
Preparation example 1
Preparing the high-voltage anode by adopting a high-temperature solid-phase methodLiCo0.985Al0.009Mg0.004Ti0.002O2The method comprises the following specific steps:
mixing Li2CO3、Co3O4Weighing according to a stoichiometric molar ratio of 1:1, and simultaneously adding 0.004mol of MgO and 0.002mol of TiO2Performing high-speed ball milling and mixing, and taking out the mixture for later use; sintering the mixture, heating to 1000 ℃ at the heating rate of 15 ℃/min, sintering for 12h, taking out a sample, and grinding to obtain Mg and Ti co-doped LiCoO2Primary sintered product LiCoO2With Al2O3Mixing according to the mol ratio of 1:0.009, grinding the mixture at high speed for 2h, heating to 900 deg.C at the heating rate of 10 deg.C/min, and sintering for 8h to obtain LiCo0.985Al0.009Mg0.004Ti0.002O2And is marked as compound 1 for standby.
Preparation example 2
Mixing Li2O, NiO were weighed at a 1:1 stoichiometric molar ratio in N2Grinding at high speed for 3h under protection, and taking out the mixture for later use; ensuring that oxygen in the high-temperature furnace is completely removed, sintering the mixture, heating to 650 ℃ at the heating rate of 15 ℃/min, sintering for 12h, taking out a sample, and grinding to obtain Li2NiO2A primary sintered product of 200g of Li2NiO2Primary sintered product and 0.20gAl2O3Mixing, grinding the mixture at high speed for 2h, heating to 600 ℃ at a heating rate of 10 ℃/min, and sintering for 8h to obtain Li2Ni0.995Al0.005O2And is marked as compound 2 for later use.
Example 1
LiCo prepared as described above0.985Al0.009Mg0.004Ti0.002O2And Li2Ni0.995Al0.005O2The two materials are 94% to 6% of positive active material by weight. Next, a positive electrode active material, PVDF as a binder, and carbon nanotubes as a conductive material were mixed at a weight ratio of 97%: 1.5%: 1.5%, the mixture was dispersed in NMP, and stirred by double planetsAfter that, a positive electrode slurry was obtained. The slurry was coated on an aluminum foil current collector having a thickness of 12 μm, followed by rolling and drying to prepare a current collector with added Li2Ni0.995Al0.005O2Compound and LiCo0.985Al0.009Mg0.004Ti0.002O2The high voltage positive electrode plate.
Also, graphite and SiO are providedx(0<x<2) The negative active material is composed of 94% to 6% by weight. Next, a negative electrode active material, styrene diene rubber (SBR), sodium carboxymethylcellulose, and conductive carbon black were mixed in a weight ratio of 94% to 3% to 2% to 1%, and the mixture was dispersed in water and mixed by double planetary to obtain a negative electrode slurry. Coating the slurry on a copper current collector, and then rolling and drying to prepare a mixed negative plate with two negative materials for later use.
The nonaqueous electrolytic solution used is a conventional electrolytic solution known in the art, and the solvent contains ethylene carbonate (abbreviated as EC), diethyl carbonate (abbreviated as DEC), propylene carbonate (abbreviated as PC), fluoroethylene carbonate (abbreviated as FEC), and the like.
And then winding in a winding mode to obtain a winding core, packaging in an aluminum plastic bag, performing hot pressing to obtain a soft package battery cell, testing the capacity of the soft package battery cell to be 3020mAh, wherein the first charge-discharge efficiency of the soft package battery cell under full electricity (3.0-4.45V) is 92.2%, and the energy density is 742.3 Wh/L.
Examples 2 to 4
Preparation of examples 2 to 4 referring to example 1, except that LiCo0.985Al0.009Mg0.004Ti0.002O2And Li2Ni0.995Al0.005O2The weight mixing ratio of the two materials. See table 1 for details.
Examples 5 to 6
EXAMPLES 5-6 preparation methods reference is made to example 1, except that graphite and SiOx(0<x<2) The weight mixing ratio of the two materials. See table 1 for details.
The first charge-discharge efficiency and energy density of the soft-packaged cells prepared in examples 1 to 6 were tested, and the results are shown in table 1:
TABLE 1
Comparative example 1
The process steps of example 1 for making a flexible pouch cell were repeated except that the positive active material was only LiCo0.985Al0.009Mg0.004Ti0.002O2。
The capacity retention rate of the soft package battery cell per cycle was measured, the charge and discharge temperature was 25 ℃ and the voltage was 3.0 to 4.45V under the conditions of 0.7C charge and 0.7C discharge, and the soft package full batteries of example 1 and comparative example 1 were subjected to the charge and discharge cycle test, and the results are shown in fig. 1. As shown in fig. 1, the pouch full cell of example 1 exhibited significantly advantageous cycle performance as compared to the pouch full cell of comparative example 1. The normal-temperature cycle performance of the material meets the capacity retention rate of more than 90% for 100 times.
Comparative example 2
Mixing the above Li2Ni0.995Al0.005O2The conductive carbon black and the PVDF are proportioned according to the mass ratio of 70 percent to 15 percent, the PVDF is firstly dissolved in NMP to obtain glue solution with the mass concentration of 6 percent, the substances are mixed and stirred and then added with NMP slowly under the vacuum environment, the viscosity and the solid content of the slurry are adjusted slowly to be suitable for coating, the slurry is stirred for 2 hours to obtain anode slurry, the anode slurry is coated on an aluminum foil current collector with the thickness of 12 mu m, and the anode sheet used by the button cell is obtained by die cutting after vacuum baking for 5 hours at 150 ℃.
Assembling the button lithium ion battery: the positive electrode plate | separator | Li plate was assembled by using a separator as a base material separator, a thickness of 20 μm, and lithium hexafluorophosphate (LiPF) of 1.2moL/L was injected6) The electrolyte is prepared from Ethylene Carbonate (EC) and dimethyl carbonate (DMC) as organic solvents according to a volume ratio of 1: 1.
After the assembly is electrically charged, the charging and discharging are carried out according to the charging and discharging cut-off voltage of 3.0-4.4V (vs. Li/Li +) and the current is 0.1C. The first charge and discharge curve is shown in FIG. 2. from FIG. 2, it can be seen that the charge capacity is 320.4mAh/g, and the discharge capacity is 104.4 mAh/g.
Comparative example 3
LiCo prepared in preparation example 20.985Al0.009Mg0.004Ti0.002O2The conductive carbon black and the PVDF are proportioned according to the mass ratio of 70 percent to 15 percent, the PVDF is firstly dissolved in NMP to obtain glue solution with the mass concentration of 6 percent, the substances are mixed and stirred and then added with NMP slowly under the vacuum environment, the viscosity and the solid content of the slurry are adjusted slowly to be suitable for coating, the slurry is stirred for 2 hours to obtain anode slurry, the anode slurry is coated on an aluminum foil current collector with the thickness of 12 mu m, and the anode sheet used by the button cell is obtained by die cutting after vacuum baking for 5 hours at 150 ℃.
Assembling the button lithium ion battery: the positive electrode plate | separator | Li plate was assembled by using a separator as a base material separator, a thickness of 20 μm, and lithium hexafluorophosphate (LiPF) of 1.2moL/L was injected6) The electrolyte is prepared from Ethylene Carbonate (EC) and dimethyl carbonate (DMC) as organic solvents according to a volume ratio of 1: 1.
After the assembly is electrically charged, the charging and discharging are carried out according to the charging and discharging cut-off voltage of 3.0-4.5V (vs. Li/Li +) and the current is 0.1C. The charging capacity is 198mAh/g, and the discharging capacity is 188 mAh/g.
As can be seen from comparative examples 2 and 3, lithium deintercalated from compound 2 stays at the negative electrode at the time of first charge and discharge, and thus it can be illustrated that the negative electrode material can be chemically compensated for lithium by the effective active lithium provided from the positive electrode.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A high voltage lithium ion battery comprising a positive electrode, a negative electrode, a nonaqueous electrolytic solution, and a separator:
the positive electrode comprises a positive electrode active material, and the positive electrode active material contains two compounds; wherein the content of the first and second substances,
the chemical formula of the compound 1 is LixCo1-yMeyO2；0.95≤x≤1.05，0≤y≤0.1；Me＝(Mz1Nz2) 0. ltoreq. z 1. ltoreq.1, 0. ltoreq. z 2. ltoreq.1, M and N are identical or different and are selected independently of one another from the group consisting of Al, Mg, Ti, Zr, Co, Ni, Mn, Y, La, Sr;
the chemical formula of the compound 2 is Li2Ni1-aDaO2(ii) a A is more than or equal to 0 and less than or equal to 0.1; d is at least one selected from Al, Mg, Ti, Zn, Fe, Co and Mn;
the negative electrode includes a negative active material including a graphite material and a silicon material.
2. The lithium ion battery of claim 1, wherein the graphite material is, for example, at least one of artificial graphite, natural graphite, and the like; the silicon material is, for example, Si, SiC and SiOx(0<x<2) One or more of (a).
3. The lithium ion battery of claim 1 or 2, wherein the silicon material comprises 0-50 wt% of the total mass of the graphite material and the silicon material, and is not 0.
Preferably, Q is defined as the mass mixing ratio of silicon material and graphite material, Q being the mass of silicon material/(mass of graphite material + mass of silicon material), 0< Q.ltoreq.0.5, preferably, such as 0< Q.ltoreq.0.15. For example, 0.06 and 0.1.
4. A lithium ion battery according to any of claims 1-3, wherein the compound 1 has the formula LixCo1- yMeyO2；0.95≤x≤1.05，0≤y≤0.1；Me＝(Mz1Nz2) Z1 is more than or equal to 0 and less than or equal to 1, z2 is more than or equal to 0 and less than or equal to 1, M and N are the same or different and are independently selected from Al, Mg and Ti, the content of Al is more than or equal to 1500ppm, and the sum of the contents of Mg and Ti<5000ppm。
Preferably, compound 2 has the formula Li2Ni1-aDaO2(ii) a A is more than or equal to 0 and less than or equal to 0.1; d is at least one selected from Al, Mg and Ti.
5. The lithium ion battery of any of claims 1-4, wherein the compound 2 is prepared by:
grinding a lithium source, a nickel source and a metal D raw material in a protective atmosphere, and then sintering at a high temperature to obtain a compound 2.
Preferably, the number of times of the high-temperature sintering is performed according to the kind of the metal D source, for example, when the kind of the metal D source is n, the number of times of the high-temperature sintering may be 1 to n times.
Preferably, the lithium source is, for example, Li2O or LiOH; sources of nickel, for example NiO or Ni (OH)2。
Preferably, the temperature of the high-temperature sintering is 600-800 ℃, and the time of the high-temperature sintering is 6-16 h.
Preferably, the metal D source is oxide or salt compound corresponding to Al, Mg, Ti, Zn, Fe, Co, Mn, Zr and the like, such as Al2O3、MgO、ZrO2、ZrCO3And (c) a compound such as a quaternary ammonium compound.
6. The lithium ion battery of any of claims 1-5, wherein the compound 2 comprises 0-50 wt% of the total mass of compound 1 and compound 2, and is not 0.
Preferably, defining P as the mass mixing ratio of compound 1 and compound 2, P ═ mass of compound 2/(mass of compound 1 + mass of compound 2), then 0< P ≦ 0.5, preferably 0< P ≦ 0.2. For example, 0.03, 0.05, 0.1, 0.2.
7. A method of manufacturing a high voltage lithium ion battery as claimed in any of claims 1 to 6, which comprises assembling the above-mentioned positive electrode, negative electrode, nonaqueous electrolytic solution and separator into a lithium ion battery.
8. The method according to claim 7, wherein the method comprises the steps of:
mixing a positive electrode active substance with a binder, a conductive agent and a solvent to prepare positive electrode slurry, coating the positive electrode slurry on the surface of a positive electrode current collector, rolling and drying to prepare a positive electrode plate;
mixing a negative electrode active material, a binder, a conductive agent and a solvent to prepare a negative electrode slurry, coating the negative electrode slurry on the surface of a negative electrode current collector, rolling and drying to prepare a negative electrode plate;
and assembling the positive pole piece, the negative pole piece and the diaphragm into a lithium ion battery, wherein electrolyte is injected.
9. The method according to claim 7 or 8, wherein the method comprises the steps of:
subjecting LiCo to0.985Al0.009Mg0.004Ti0.002O2And Li2Ni0.995Al0.005O2The positive active material consists of 94% to 6% of the two materials by weight; next, a positive electrode active material, PVDF as a binder, and carbon nanotubes as a conductive material were mixed at a weight ratio of 97%: 1.5%: 1.5%, and the mixture was dispersed in NMP, and after stirring by double planets, a positive electrode slurry was obtained. The slurry was coated on an aluminum foil current collector having a thickness of 12 μm, followed by rolling and drying to prepare a current collector with added Li2Ni0.995Al0.005O2Compound and LiCo0.985Al0.009Mg0.004Ti0.002O2The high voltage positive electrode plate;
mixing graphite and SiOx(0<x<2) A negative active material consisting of 94% to 6% by weight; mixing a negative electrode active material, styrene diene rubber, sodium carboxymethylcellulose and conductive carbon black in a weight ratio of 94% to 3% to 2% to 1%, dispersing the mixture in water, and mixing by double planets to obtain a negative electrode slurry. Coating the slurry on a copper current collector, and then rolling and drying to prepare a mixed negative pole piece with two negative pole materials;
and assembling the prepared positive pole piece, negative pole piece and diaphragm into a lithium ion battery, and injecting a non-aqueous electrolyte.
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