CN109346726B - High-temperature manganese lithium battery anode - Google Patents
High-temperature manganese lithium battery anode Download PDFInfo
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- CN109346726B CN109346726B CN201811340632.7A CN201811340632A CN109346726B CN 109346726 B CN109346726 B CN 109346726B CN 201811340632 A CN201811340632 A CN 201811340632A CN 109346726 B CN109346726 B CN 109346726B
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
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- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- 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
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- 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
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a high-temperature manganese lithium battery anode which comprises an anode current collector and anode slurry coated on the anode current collector, wherein the anode slurry comprises an anode active substance, a conductive agent, a binder and a solvent, and the anode active substance comprises lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1: (0.5-2): (0.2-0.8): (0.01-0.05). According to the invention, a small amount of porous carbon is added into the positive electrode material, so that on one hand, gas generated in the reaction process of the battery can be adsorbed, and the corrosion of the gas to an electrode plate is reduced, thereby improving the cycling stability of the battery at high temperature; on the other hand, the dissolution of manganese can be blocked, so that the cycling stability of the lithium battery at high temperature is improved.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a high-temperature manganese lithium battery anode.
Background
The lithium ion battery has the advantages of high open-circuit voltage, large energy density, long service life, no memory effect, no pollution, small self-discharge and the like, is a battery system with the best comprehensive performance at present, and is also a battery system with the widest applicable range. Through the rapid development of over ten years, the lithium ion battery industry chain is mature in China, the technical performance, the maturity and the industrialization reach a considerable scale, the lithium ion battery industry chain is the first choice for new energy and batteries in the electric automobile industry in a future period, and the lithium ion battery industry chain has absolute popularization and application advantages and huge development space. It is well known that the performance of lithium ion batteries depends mainly on the structure and performance of the lithium ion battery material. The lithium ion battery material mainly comprises a positive electrode material, a negative electrode material, a diaphragm and electrolyte, wherein the positive electrode material directly determines the performances of the lithium ion battery such as energy density, service life and the like, and is a key influence factor of the performance of the lithium ion battery.
As the anode material of the power lithium ion battery, ternary oxide series materials containing cobalt and nickel, phosphate series materials such as lithium iron phosphate and the like and spinel lithium manganate materials become alternative common materials by respective advantages. The spinel lithium manganate material has the outstanding advantages of high energy density, high power density, high working voltage, low cost and the like, and is a power type lithium ion battery anode material with the most application prospect. However, due to the JahnTeller effect, the manganese-oxygen octahedron structure in the spinel type lithium manganate material is unstable in the charge-discharge cycle process, and in addition, the dissolution of divalent manganese causes the material capacity to be attenuated quickly, and the cycle stability is not good. When the temperature rises, the properties of the material are further deteriorated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-temperature manganese lithium battery anode which has good cycling stability at high temperature.
In order to solve the technical problem, the invention provides a high-temperature manganese lithium battery anode which comprises an anode current collector and anode slurry coated on the anode current collector, wherein the anode slurry comprises an anode active substance, a conductive agent, a binder and a solvent, and the anode active substance comprises lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1: (0.5-2): (0.2-0.8): (0.01-0.05).
The inventor of the invention finds that the lithium manganate, the nickel cobalt lithium manganate 532, the lithium vanadium phosphate and the active carbon are compounded according to a specific proportion, so that the synergistic effect among materials can be optimal, the structural change of the materials in the charging and discharging processes can be slowed down due to the structural difference and the surface energy difference of different materials, and the dissolution of manganese ions in the charging and discharging processes is reduced, so that the stability of the materials is improved, and on the other hand, gas generated in the charging and discharging processes of the lithium battery can be adsorbed on the surface of an electrode plate, so that the service life of the electrode is influenced; on the other hand, the dissolution of manganese can be blocked, so that the cycling stability of the lithium battery at high temperature is improved.
In order to further improve the cycling stability of the lithium battery anode at high temperature, the anode active substance is prepared from lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1: (1-1.5): (0.4-0.65): (0.015-0.03); more preferably 1: (1.2-1.35): (0.5-0.6): (0.02 to 0.025), for example, 1:1:0.65: 0.015; 1:1.5:0.4: 0.03; 1:1.2:0.5: 0.002; 1:1.35:0.6: 0.025; 1:1.28:0.55: 0.03; 1:1.25:0.53:0.02.
The inventor of the invention finds that the tap density of each substance in the positive active material has a remarkable influence on the high-temperature cycle performance of the lithium battery positive electrode, the cycle stability of the lithium battery positive electrode at high temperature can be remarkably improved by adjusting the tap density of each substance in the positive active material, and preferably, the tap density of lithium manganate is 2.8-4.3 g/cm3(ii) a More preferably 3 to 3.8g/cm3(for example, it may be 2.8g/cm3；3g/cm3；3.2g/cm3；3.5g/cm3；3.8g/cm3；4g/cm3；4.2g/cm3；4.3g/cm3）；
The tap density of the nickel cobalt lithium manganate 532 is 2.9-3.5 g/cm3(ii) a More preferably 3 to 3.5g/cm3(for example, it may be 2.9g/cm3；3g/cm3；3.2g/cm3；3.5g/cm3；）；
The tap density of the lithium vanadium phosphate and the lithium vanadium phosphate is 2.9-3.8 g/cm3(ii) a More preferably 3.2 to 3.6 g/cm3(for example, it may be 2.9g/cm3；3.2g/cm3；3.5g/cm3；3.6g/cm3；3.8g/cm3）；
The particle size and the specific surface area of the porous carbon are another important factor influencing the cycle performance of the battery under the high-temperature condition, the smaller particle size can enable the activated carbon to be in full contact with a manganese-containing active material to inhibit the dissolution of manganese, the higher specific surface area can fully absorb gas released by the battery, and under the preferable condition, the specific surface area of the porous carbon is 525-638 m2(ii)/g; more preferably, the particle size of the porous carbon is 300-325 meshes.
The positive electrode of the invention comprises the following components: 96.5 wt% of a positive electrode active material, 1.5 wt% of a conductive agent, and 2 wt% of a binder.
The preparation steps of the positive electrode are as follows:
(1) weighing lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio to obtain a positive electrode mixture, adding the positive electrode mixture, a conductive agent and the binder into a vacuum stirrer, and stirring for 45min at the rotating speed of 20r/min to obtain positive electrode powder;
(2) uniformly stirring the positive electrode powder and NMP in a vacuum stirrer to obtain a positive electrode slurry paste body 1, wherein the stirring speed is 1500r/min, and the stirring time is 60 min;
(3) uniformly stirring the positive electrode slurry mixing paste body 1 and NMP in a vacuum stirrer to obtain a positive electrode slurry mixing paste body 2, wherein the stirring speed is 2000r/min, and the stirring time is 90 min;
(4) adding NMP into the positive electrode slurry-mixing paste body 2 to obtain slurry with the viscosity of 6600mPa & s, and sieving the slurry with a 120-mesh sieve to obtain positive electrode slurry;
(5) and coating the screened positive electrode slurry on the front side and the back side of a copper foil with the thickness of 20 mu m, and then drying and rolling at 120 ℃ to obtain the high-temperature manganese lithium battery positive electrode.
The conductive agent in the present invention may be known to those skilled in the art, and when the conductive agent is formed by mixing conductive graphite and carbon nanotubes in an amount of 1: (1-2), the cycle stability of the lithium battery positive electrode at high temperature can be further improved.
The binder of the present invention can be known to those skilled in the art, and when the binder is sodium carboxymethylcellulose and PVDF in a weight ratio of 1: (1.5-2), the cycling stability of the lithium battery anode at high temperature can be further improved.
The lithium battery anode is suitable for being combined with various conventional lithium battery cathodes to prepare a lithium battery with good cycling stability at high temperature. When the negative active material is artificial graphite, mesocarbon microbeads and porous carbon, the ratio of (0.5-0.8) to 1: (0.1-0.3), the cycle performance of the lithium battery is best.
Through the technical scheme, the invention has the following technical effects:
according to the invention, the lithium manganate, the nickel cobalt lithium manganate 532, the lithium vanadium phosphate and the activated carbon are compounded according to a specific proportion, so that the synergistic effect among materials can be optimized, the structural change of the materials in the charging and discharging processes can be slowed down due to the structural difference and the surface energy difference of different materials, and the dissolution of manganese ions in the charging and discharging processes is reduced, so that the stability of the materials is improved; on the other hand, the dissolution of manganese can be blocked, so that the cycling stability of the lithium battery at high temperature is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The high-temperature manganese lithium battery positive electrode consists of a positive electrode current collector copper foil and positive electrode slurry coated on the positive electrode current collector, wherein the positive electrode slurry consists of 96.5 wt% of positive electrode active substances, 1.5 wt% of conductive agents (comprising conductive graphite and carbon nano tubes in a weight ratio of 1: 1.5), 2 wt% of binders (sodium carboxymethylcellulose and PVDF in a weight ratio of 1: 1.8) and solvents;
the positive active material comprises lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1:1.28:0.55: 0.03;
the tap density of the lithium manganate is 3.5g/cm3(ii) a The tap density of the nickel cobalt lithium manganate 532 is 3.2g/cm3(ii) a The tap density of the lithium vanadium phosphate is 3.2g/cm3(ii) a The specific surface area of the porous carbon sheet is 630m2Per g, granuleThe diameter is 325 meshes.
The preparation steps of the positive electrode are as follows:
(1) weighing lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio to obtain a positive electrode mixture, adding the positive electrode mixture, a conductive agent and the binder into a vacuum stirrer, and stirring for 45min at the rotating speed of 20r/min to obtain positive electrode powder;
(2) uniformly stirring the positive electrode powder and NMP in a vacuum stirrer to obtain a positive electrode slurry paste body 1, wherein the stirring speed is 1500r/min, and the stirring time is 60 min;
(3) uniformly stirring the positive electrode slurry mixing paste body 1 and NMP in a vacuum stirrer to obtain a positive electrode slurry mixing paste body 2, wherein the stirring speed is 2000r/min, and the stirring time is 90 min;
(4) adding NMP into the positive electrode slurry-mixing paste body 2 to obtain slurry with the viscosity of 6600mPa & s, and sieving the slurry with a 120-mesh sieve to obtain positive electrode slurry;
(5) and coating the screened positive electrode slurry on the front side and the back side of a copper foil with the thickness of 20 mu m, and then drying and rolling at 120 ℃ to obtain the high-temperature manganese lithium battery positive electrode.
The embodiment also provides a lithium battery which comprises a positive electrode, a diaphragm, a negative electrode and electrolyte, wherein the positive electrode is prepared according to the method.
The composition of the negative electrode was: the negative electrode consists of 95 wt% of mesocarbon microbeads, 1 wt% of conductive graphite and 4 wt% of binder (carboxymethyl cellulose);
the negative active material is composed of artificial graphite, mesocarbon microbeads and porous carbon according to the weight ratio of 0.6:1: 0.15.
The preparation method of the negative electrode comprises the following steps:
uniformly stirring the cathode material and deionized water in a vacuum stirrer at the stirring speed of 1200r/min for 90min at the stirring temperature of 40 ℃ to obtain slurry with the viscosity of 3200mPa & s, and sieving the slurry with a 120-mesh sieve to obtain cathode slurry; coating the screened negative electrode slurry on the front and back surfaces of a copper foil with the thickness of 8 mu m, drying at 120 ℃, and rolling under the pressure of 1.6MPa to obtain the anode materialTo a compacted density of 1.2g/cm3Areal density of 68g/cm2The negative electrode sheet of (1).
Assembly of a battery
LiPF6 was formulated with methylene methanedisulfonate, Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC) and dimethyl carbonate (DMC) into a solution having a concentration of 1mol/L of LiPF6 (wherein the weight ratio of EC, EMC and DMC was 1: 1), wherein the content of methylene methanedisulfonate was 2% of the total weight of EC, EMC and DMC, to obtain a nonaqueous electrolytic solution.
The positive electrode, a PE separator having a thickness of 25 μm and a negative electrode were sequentially stacked and wound by a winder to form an aluminum prismatic can battery IFP2714897-20, the obtained electrode assembly was placed in a can case having an open end, the nonaqueous electrolytic solution was poured into the can case, the can case was left at 60 ℃ for 1 day, and then the can case was sealed with steel balls under a vacuum of-0.08 MPa, and the electrochemical properties of the can case were as shown in Table 1.
Example 2
The high-temperature manganese lithium battery positive electrode consists of a positive electrode current collector copper foil and positive electrode slurry coated on the positive electrode current collector, wherein the positive electrode slurry consists of 96.5 wt% of positive electrode active substances, 1.5 wt% of conductive agents (comprising conductive graphite and carbon nano tubes in a weight ratio of 1: 1.5), 2 wt% of binders (sodium carboxymethylcellulose and PVDF in a weight ratio of 1: 2) and solvents;
the positive active material comprises lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1:1.25:0.53: 0.02;
the tap density of the lithium manganate is 4g/cm3(ii) a The tap density of the nickel cobalt lithium manganate 532 is 3.5g/cm3(ii) a The tap density of the lithium vanadium phosphate is 2.9g/cm3(ii) a The specific surface area of the porous carbon sheet is 585 m2(ii)/g, particle size 325 mesh.
The procedure for preparing the positive electrode was the same as in example 1.
A lithium battery comprises a positive electrode, a diaphragm, a negative electrode and electrolyte, wherein the positive electrode is the high-temperature manganese lithium battery positive electrode; the method of preparing the negative electrode and the method of assembling the battery were the same as in example 1.
Example 3
The high-temperature manganese lithium battery positive electrode consists of a positive electrode current collector copper foil and positive electrode slurry coated on the positive electrode current collector, wherein the positive electrode slurry consists of 96.5 wt% of positive electrode active substances, 1.5 wt% of conductive agents (comprising conductive graphite and carbon nano tubes in a weight ratio of 1: 1.5), 2 wt% of binders (sodium carboxymethylcellulose and styrene-butadiene latex in a weight ratio of 1: 1.5) and solvents;
the positive active material comprises lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1:1.35:0.6: 0.025;
the tap density of the lithium manganate is 3.8g/cm3(ii) a The tap density of the nickel cobalt lithium manganate 532 is 2.9g/cm3(ii) a The tap density of the lithium vanadium phosphate is 2.9g/cm3(ii) a The specific surface area of the porous carbon sheet is 535m2(g) the particle size is 300 meshes.
The preparation method of the positive electrode is the same as that of example 1.
A lithium battery comprises a positive electrode, a diaphragm, a negative electrode and electrolyte, wherein the positive electrode is the high-temperature manganese lithium battery positive electrode; the method of preparing the negative electrode and the method of assembling the battery were the same as in example 1.
Example 4
The high-temperature manganese lithium battery positive electrode consists of a positive electrode current collector copper foil and positive electrode slurry coated on the positive electrode current collector, wherein the positive electrode slurry consists of 96.5 wt% of positive electrode active substances, 11.5 wt% of conductive agents (comprising conductive graphite and carbon nano tubes in a weight ratio of 1: 1), 2 wt% of binders (sodium carboxymethylcellulose and styrene-butadiene latex in a weight ratio of 1: 1.8) and a solvent;
the positive active material is composed of lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1:1.2:0.5: 0.002;
the tap density of the lithium manganate is 2.8g/cm3(ii) a The tap density of the nickel cobalt lithium manganate 532 is 3.5g/cm3(ii) a The tap density of the lithium vanadium phosphate is 3.0g/cm3(ii) a The porous carbon sheetHas a specific surface area of 535m2(g) the particle size is 300 meshes.
The preparation method of the positive electrode is the same as that of example 1.
A lithium battery comprises a positive electrode, a diaphragm, a negative electrode and electrolyte, wherein the positive electrode is the high-temperature manganese lithium battery positive electrode; the method of preparing the negative electrode and the method of assembling the battery were the same as in example 1.
Example 5
The high-temperature manganese lithium battery positive electrode consists of a positive electrode current collector copper foil and positive electrode slurry coated on the positive electrode current collector, wherein the positive electrode slurry consists of 96.5 wt% of positive electrode active substances, 1.5 wt% of conductive agents (comprising conductive graphite and carbon nano tubes in a weight ratio of 1: 2), 2 wt% of binders (sodium carboxymethylcellulose and styrene-butadiene latex in a weight ratio of 1: 1.8) and solvents;
the positive active material is composed of lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1:1.5:0.4: 0.03;
the tap density of the lithium manganate is 3.2g/cm3(ii) a The tap density of the nickel cobalt lithium manganate 532 is 3.2g/cm3(ii) a The tap density of the lithium vanadium phosphate is 3.8g/cm3(ii) a The specific surface area of the porous carbon sheet is 535m2(g) the particle size is 300 meshes.
The preparation method of the positive electrode is the same as that of example 1.
A lithium battery comprises a positive electrode, a diaphragm, a negative electrode and electrolyte, wherein the positive electrode is the high-temperature manganese lithium battery positive electrode; the method of preparing the negative electrode and the method of assembling the battery were the same as in example 1.
Comparative example 1
The process of example 1 was followed except that: the positive active material comprises lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1:0.2:1: 0.02.
Comparative example 2
The process of example 1 was followed except that: the positive active material comprises lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate and porous carbon according to the weight ratio of 1:2.5:0.1: 0.02.
Comparative example 3
The procedure of example 1 was repeated, except that the tap density of lithium manganate was 2.5g/cm3(ii) a The tap density of the nickel cobalt lithium manganate 532 is 4g/cm3(ii) a The tap density of the lithium vanadium phosphate is 2.5g/cm3。
Comparative example 4
The procedure of example 1 was repeated, except that the tap density of lithium manganate was 4.5g/cm3(ii) a The tap density of the nickel cobalt lithium manganate 532 is 2.1g/cm3(ii) a The tap density of the lithium vanadium phosphate is 4g/cm3。
Comparative example 5
The process of example 1 was followed except that: the positive electrode active material does not contain active carbon.
Comparative example 6
The process of example 1 was followed except that: the positive active material is lithium manganate.
Examples of the experiments
At 85 ℃, the materials are charged in a constant voltage charging mode, the limiting current is 0.5C, the end voltage is 3.5V, the materials are discharged in a constant current discharging mode, the discharging current is 0.5C, the cut-off voltage of the discharging is 2.5V, the cycle is 450 times, the capacity retention ratio R after the cycle is 450 times is calculated, and the experimental results are shown in table 1.
Table 1:
| capacity retention rate R/%) | |
| Example 1 | 81.3 |
| Example 2 | 79.2 |
| Example 3 | 76.3 |
| Example 4 | 75.2 |
| Example 5 | 72.1 |
| Comparative example 1 | 61.3 |
| Comparative example 2 | 62.1 |
| Comparative example 3 | 64.7 |
| Comparative example 4 | 65.2 |
| Comparative example 5 | 58.6 |
| Comparative example 6 | 59.2 |
The above description is only for the purpose of describing some embodiments of the present invention, and is not intended to limit the scope of the present invention, and one skilled in the art can make improvements or modifications to the above embodiments according to the present invention, but all fall within the scope of the present invention.
Claims (7)
1. The utility model provides a high temperature type manganese system lithium cell positive pole, comprises anodal mass flow body and the anodal thick liquids of coating on anodal mass flow body, anodal thick liquids comprises anodal active material, conductive agent, binder and solvent, its characterized in that, anodal active material is 1 by lithium manganate, nickel cobalt lithium manganate 532, lithium vanadium phosphate, porous carbon according to the weight ratio: (0.5-2): (0.2-0.8): (0.01-0.05);
the tap density of the lithium manganate is 2.8-4.3 g/cm3；
The tap density of the nickel cobalt lithium manganate 532 is 2.9-3.5 g/cm3；
The tap density of the lithium vanadium phosphate is 2.9-3.8 g/cm3；
The specific surface area of the porous carbon is 525-638 m2/g；
The conductive agent is prepared from conductive graphite and carbon nanotubes in a weight ratio of 1: (1-2);
the binder is sodium carboxymethylcellulose and PVDF in a weight ratio of 1: (1.5-2).
2. A high temperature type manganese lithium battery positive electrode according to claim 1, wherein said positive electrode active material is selected from lithium manganate, lithium nickel cobalt manganate 532, lithium vanadium phosphate, porous carbon in a weight ratio of 1: (1-1.5): (0.4-0.65): (0.015-0.03).
3. A high temperature type manganese lithium battery positive electrode according to claim 2, wherein said positive electrode active material is selected from lithium manganate, lithium nickel cobalt manganate 532, lithium vanadium phosphate, porous carbon in a weight ratio of 1: (1.2-1.35): (0.5-0.6): (0.02-0.025).
4. A high temperature type manganese lithium battery positive electrode according to any one of claims 1 to 3, wherein said lithium manganate has a tap density of 3 to 3.8g/cm3。
5. A high temperature type manganese lithium battery positive electrode according to claim 4, wherein the tap density of Ni-Co-Mn acid lithium 532 is 3 to 3.5g/cm3。
6. A high temperature type manganese-based lithium battery positive electrode according to claim 5, wherein said lithium vanadium phosphate has a tap density of 3.2 to 3.6 g/cm3。
7. A high temperature type manganese-based lithium battery positive electrode according to claim 6, wherein said porous carbon has a particle size of 300 to 325 mesh.
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| CN111785975A (en) * | 2020-07-31 | 2020-10-16 | 蜂巢能源科技有限公司 | Current collector, preparation method and application thereof, cathode and lithium ion battery |
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| CN103050681A (en) * | 2012-12-22 | 2013-04-17 | 彩虹集团公司 | Preparation method of high-compaction spherical ternary cathode material |
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