CN112687859A - High-rate charge-discharge type lithium ion battery and battery slurry - Google Patents
High-rate charge-discharge type lithium ion battery and battery slurry Download PDFInfo
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Abstract
The invention provides a high-rate charge-discharge type lithium ion battery and battery slurry, wherein the battery slurry comprises anode slurry and cathode slurry; the positive plate of the lithium ion battery comprises a positive current collector and positive coatings arranged on the two side surfaces of the positive current collector, wherein the positive coatings are prepared by coating the positive slurry on the two side surfaces of the positive current collector and then drying; the negative plate of the lithium ion battery comprises a negative current collector and negative coatings arranged on the surfaces of the two sides of the negative current collector, wherein the negative coatings are prepared by coating the negative slurry on the surfaces of the two sides of the negative current collector and then drying the negative slurry. The lithium ion battery provided by the application satisfies high-rate charge and discharge and simultaneously improves the cycle performance and the service life of the battery.
Description
Technical Field
The invention belongs to the technical field of batteries, relates to a lithium ion battery, and particularly relates to a high-rate charge-discharge type lithium ion battery and battery slurry.
Background
With the continuous development of society and the continuous progress of technology level, lithium ion batteries have gained important applications in many fields, for example, electronic products such as mobile phones, watches, computers, etc. are all unable to leave lithium ion batteries. From the demand of the current market for lithium ion batteries, high-rate charge-discharge type lithium ion batteries become an important development direction of lithium ion batteries. However, the lithium metal is precipitated from the negative electrode during the rapid charging process, which is likely to cause the reduction of the battery capacity and the cycle life, so that the rapid charging technology still has major defects.
CN 111799500a discloses a lithium ion battery with high-rate charge and discharge, which comprises a battery shell, a positive electrode unit, a negative electrode unit, a diaphragm and an electrolyte; the positive electrode unit, the negative electrode unit, the diaphragm and the electrolyte are all arranged inside the battery shell; the anode unit, the cathode unit and the diaphragm are soaked in the electrolyte; the positive electrode unit consists of a plurality of positive electrode subunits, the negative electrode unit consists of a plurality of negative electrode subunits, and the diaphragm is arranged between two adjacent groups of positive electrode subunits and negative electrode subunits; the positive sub-unit comprises a positive plate, a positive lug, a positive active material and an aluminum foil, and the negative sub-unit comprises a negative plate, a negative lug, a negative active material and a copper foil. The lithium ion battery can be charged to more than 85% of electric quantity after being rapidly charged for 10 minutes, and meanwhile, 25C rate discharge can last for more than 4 minutes. However, the invention does not mention the cycle performance and the service life of the lithium ion battery, and a large space for improvement still exists.
CN 101510625a discloses an ultra-high rate lithium ion battery, which comprises a positive plate, a negative plate, a diaphragm, electrolyte, a tab and a packaging shell; the positive plate is prepared by coating the mixed slurry of the positive active material, the conductive agent and the binder on two sides of an aluminum foil, and the negative plate is prepared by coating the mixed slurry of the negative active material, the conductive agent and the binder on two sides of a copper foil; the electrolyte is a mixed solution of lithium salt and an organic solvent. The battery can continuously discharge under the condition of ultrahigh rate, the discharge rate can reach 35C-50C, and the discharge rates of 35C, 40C, 45C and 50C respectively reach 96.3%, 95.6%, 95.1% and 94.5% of 1C discharge capacity. However, the invention also does not mention the cycle performance and the service life of the lithium ion battery under the condition of quick charge and discharge.
CN 108511788A discloses a high-rate ternary system start-stop lithium ion battery and a preparation method thereof, wherein the battery comprises a positive plate, a negative plate, a diaphragm, electrolyte and an aluminum-plastic film; the positive plate comprises a positive current collector and a positive mixture layer coated on the surface of the positive current collector, and the negative plate comprises a negative current collector and a negative mixture layer coated on the surface of the negative current collector; the coating surface density of the positive electrode mixture layer is 0.96-1.60g/dm2The coating surface density of the negative electrode mixture layer is 0.5-0.8g/dm2. The battery has the characteristic of high-rate charge and discharge, can meet the requirement of 30-50C high-rate instantaneous quick charge, has 40-70C rate continuous discharge capacity, and meets the requirement of instantaneous high-power output and input of a start-stop battery. However, the invention also does not mention the cycle performance and the service life of the lithium ion battery under the condition of quick charge and discharge.
Therefore, how to provide a lithium ion battery, which can meet the requirements of high-rate charge and discharge and simultaneously improve the cycle performance and the service life of the battery, becomes a problem to be solved by technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a high-rate charge-discharge type lithium ion battery and battery slurry, wherein the lithium ion battery meets the requirement of high-rate charge-discharge and simultaneously improves the cycle performance and the service life of the battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a battery paste, comprising a positive electrode paste and a negative electrode paste;
the positive electrode slurry comprises the following components in parts by weight:
in the present invention, the amount of the lithium salt is 96 to 99 parts by weight, and may be, for example, 96 parts, 96.5 parts, 97 parts, 97.5 parts, 98 parts, 98.5 parts or 99 parts by weight, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the positive electrode conductive agent is used in an amount of 0.5 to 3 parts by weight, for example, 0.5 part, 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts by weight, but the present invention is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the positive electrode binder is used in an amount of 0.5 to 3 parts by weight, for example, 0.5 part, 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts by weight, but the positive electrode binder is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the organic solvent is used in an amount of 30 to 50 parts by weight, for example, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts or 50 parts, but the organic solvent is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the lithium salt comprises lithium cobaltate.
Preferably, the lithium salt has a particle size distribution of D50 ═ 1.5 to 7 μm, and may be, for example, D50 ═ 1.5 μm, D50 ═ 2 μm, D50 ═ 2.5 μm, D50 ═ 3 μm, D50 ═ 3.5 μm, D50 ═ 4 μm, D50 ═ 4.5 μm, D50 ═ 5 μm, D50 ═ 5.5 μm, D50 ═ 6 μm, D50 ═ 6.5 μm, or D50 ═ 7 μm, but is not limited to the values listed, and other values not listed within this range of values are also applicable.
Preferably, the positive electrode conductive agent includes Carbon Nanotubes (CNTs).
Preferably, the positive electrode binder includes polyvinylidene fluoride (PVDF).
Preferably, the organic solvent comprises N-methylpyrrolidone (NMP).
Preferably, the negative electrode slurry comprises the following components in parts by weight:
in the present invention, the graphite is used in an amount of 95 to 98 parts by weight, for example, 95 parts, 95.5 parts, 96 parts, 96.5 parts, 97 parts, 97.5 parts or 98 parts by weight, but the amount is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the negative electrode conductive agent may be used in an amount of 1.4 to 2.5 parts by weight, for example, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts or 2.5 parts, but the amount is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the thickener is used in an amount of 0.1 to 3 parts by weight, for example, 0.1 part, 0.2 part, 0.4 part, 0.6 part, 0.8 part, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts or 3 parts, but the amount is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
In the present invention, the negative electrode binder may be used in an amount of 0.1 to 3 parts by weight, for example, 0.1 part, 0.2 part, 0.4 part, 0.6 part, 0.8 part, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts or 3 parts, but the amount is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the present invention, the water is 100-130 parts by weight, for example, 100 parts, 104 parts, 108 parts, 112 parts, 116 parts, 120 parts, 124 parts, 128 parts or 130 parts, but the present invention is not limited to the recited values, and other values not recited in the range of the values are also applicable.
According to the invention, through reasonably regulating and controlling the weight parts of each component in the anode slurry and the cathode slurry, the lithium ion battery prepared by the battery slurry can meet the requirement of high-rate charge and discharge, and simultaneously the cycle performance and the service life of the battery are improved.
Preferably, the negative electrode conductive agent includes conductive carbon black (Super-P).
Preferably, the thickener comprises carboxymethyl cellulose (CMC).
Preferably, the negative electrode binder includes Styrene Butadiene Rubber (SBR).
Preferably, the graphite has a particle size distribution of D50-15 μm, for example, D50-12 μm, D50-12.5 μm, D50-13 μm, D50-13.5 μm, D50-14 μm, D50-14.5 μm or D50-15 μm, but is not limited to the values listed, and other values not listed within this range are equally applicable.
According to the invention, the specific surface area of graphite is reduced by properly increasing the particle size distribution of the graphite to 12-15 μm based on the traditional graphite particle size distribution, an irreversible SEI film with a smaller area is formed in the first charging process, the irreversible capacity loss is reduced, the electrochemical impedance is reduced, and the charge-discharge rate and the cycle performance of the lithium ion battery are further improved.
In a second aspect, the invention provides a high-rate charge-discharge type lithium ion battery, wherein a positive plate of the lithium ion battery comprises a positive current collector and positive coatings arranged on the surfaces of two sides of the positive current collector; the positive coating is prepared by coating the positive slurry on the two side surfaces of the positive current collector and drying;
the negative plate of the lithium ion battery comprises a negative current collector and negative coatings arranged on the surfaces of the two sides of the negative current collector; the negative electrode coating is prepared by coating the negative electrode slurry on the two side surfaces of the negative electrode current collector and drying.
In a second aspect of the present invention, a lithium ion battery is prepared by using the battery slurry provided in the first aspect, and the lithium ion battery has excellent cycle performance and a long service life while satisfying high-rate charge and discharge.
Preferably, the lithium ion battery has a designed negative electrode capacity in excess of 10% to 25%, for example, 10%, 11%, 13%, 15%, 17%, 19%, 21%, 23%, or 25%, but not limited to the recited values, and other values not recited in the recited range are also applicable.
In the invention, the adopted means is not particularly limited as long as the excess range of the designed capacity of the negative electrode of the lithium ion battery can reach 10-25%.
In the invention, when the excessive range of the designed capacity of the negative electrode exceeds 25%, shallow charge and discharge of the negative electrode and deep charge and discharge of the positive electrode can be caused, although the negative electrode in a full-charge state is not easy to separate lithium and is safer, the oxidation state of the positive electrode is increased, so that potential safety hazards are increased; when the excessive range of the designed capacity of the negative electrode is less than 10%, the positive electrode cannot be fully utilized, the exertion of gram capacity is influenced, lithium is easy to precipitate during charging, capacity loss is caused, and potential safety hazards are increased.
Preferably, the lithium ion battery comprises a battery shell, and a positive electrode unit, a negative electrode unit, a diaphragm and electrolyte which are arranged in the battery shell; the anode unit, the cathode unit and the diaphragm are soaked in the electrolyte; the positive electrode unit comprises at least 2 positive electrode subunits, for example, 2, 3, 4, 5 or 6 positive electrode subunits, but the positive electrode unit is not limited to the recited numerical values, and other non-recited numerical values in the numerical range are also applicable; the negative electrode unit comprises at least 2 negative electrode subunits, for example, 2, 3, 4, 5 or 6 negative electrode subunits, but not limited to the recited values, and other non-recited values within the range of values are also applicable; the diaphragm is arranged between the adjacent positive electrode subunit and the negative electrode subunit; the positive sub-unit comprises a positive plate, a positive lug and insulating gummed paper; the negative electrode subunit comprises a negative electrode sheet, a negative electrode lug and insulating gummed paper.
Preferably, the thickness ratio of the positive and negative subunits is (0.8-1.3):1, and may be, for example, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, or 1.3:1, but is not limited to the recited values, and other values not recited within the numerical range are equally applicable.
In the invention, the thicknesses of the positive electrode subunit and the negative electrode subunit are respectively the thicknesses of a positive plate pasted with the insulating gummed paper and a negative plate pasted with the insulating gummed paper, the positive plate comprises a positive current collector and positive coatings arranged on the surfaces of the two sides of the positive current collector, and the negative plate comprises a negative current collector and negative coatings arranged on the surfaces of the two sides of the negative current collector.
Preferably, the positive electrode current collector includes an aluminum foil.
Preferably, the negative electrode current collector includes a copper foil.
Preferably, the material of the diaphragm comprises polyethylene and/or polypropylene.
Preferably, the thickness of the separator is 12 to 18 μm, and may be, for example, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, 15 μm, 15.5 μm, 16 μm, 16.5 μm, 17 μm, 17.5 μm or 18 μm, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the electrolyte includes an electrolyte, an organic solvent, and an additive.
Preferably, the conductivity of the electrolyte is at least 9.48mS/cm, for example 9.48mS/cm, 9.5mS/cm, 9.6mS/cm, 9.7mS/cm, 9.8mS/cm, 9.9mS/cm or 10mS/cm, but is not limited to the values listed, and other values not listed in this range of values are equally suitable.
The specific type and proportion of the electrolyte composition are regulated and controlled to ensure that the conductivity is more than or equal to 9.48mS/cm, the conductivity of the electrolyte is more than or equal to 9.48mS/cm, the specific type and proportion of the electrolyte composition are not particularly limited, and the electrolyte disclosed in embodiment 1-3 of CN 111987362A can be selected.
Preferably, the battery case is formed by punching and cutting at least 3 layers of aluminum plastic films, such as 3 layers, 4 layers, 5 layers, 6 layers, 7 layers or 8 layers, but not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the thickness of the aluminum plastic film is 80 to 150 μm, for example, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
In the present invention, the method of assembling the battery case, the positive electrode cell, the negative electrode cell, the separator and the electrolyte into the lithium ion battery is a conventional battery assembling method, and the assembling process and conditions are not particularly limited as long as the battery can be assembled, and for example, the assembling method disclosed in embodiment 1 of CN 110690506a may be used.
Compared with the prior art, the invention has the following beneficial effects:
(1) the high-rate charge-discharge type lithium ion battery provided by the invention has an excellent quick charge function, the 6C constant current charge input rate can reach 76.1% at most, the shortest constant current charge time is only 8.7min, and the shortest total constant current and constant voltage charge time is only 32.9 min;
(2) the high-rate charge-discharge type lithium ion battery provided by the invention has a rapid discharge function, and the discharge capacity retention rate of 10C relative to 1C can reach 97.5 percent to the maximum extent;
(3) the high-rate charge-discharge type lithium ion battery provided by the invention has a long cycle function, the retention rate of the cell capacity is only reduced to 80% when the cycle reaches 1000 weeks under a 6C charge/10C discharge cycle system, and the high-rate charge-discharge type lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
Drawings
Fig. 1 is a plot of the charge/10C discharge cycle performance of lithium ion battery 6C provided in example 1.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a high-rate charge-discharge type lithium ion battery and battery slurry, wherein the slurry comprises anode slurry and cathode slurry; the lithium ion battery comprises a battery shell, and a positive electrode unit, a negative electrode unit, a diaphragm and electrolyte which are arranged in the battery shell; the battery shell is prepared by punching and cutting 3 layers of aluminum-plastic films, and the thickness of each aluminum-plastic film is 115 mu m; the anode unit, the cathode unit and the diaphragm are soaked in the electrolyte; the positive electrode unit comprises 4 positive electrode subunits, and the negative electrode unit comprises 4 negative electrode subunits; the diaphragm is arranged between the adjacent positive electrode subunit and the negative electrode subunit, the material of the diaphragm is polyethylene, and the thickness of the diaphragm is 15 micrometers; the positive electrode subunit comprises a positive plate, a positive tab and insulating gummed paper, the negative electrode subunit comprises a negative plate, a negative tab and insulating gummed paper, and the thickness ratio of the positive electrode subunit to the negative electrode subunit is 1: 1; the positive plate comprises a positive current collector aluminum foil and positive coatings arranged on the two side surfaces of the positive current collector, and the negative plate comprises a negative current collector copper foil and negative coatings arranged on the two side surfaces of the negative current collector; the anode coating is prepared by coating the anode slurry on the surfaces of the two sides of the anode current collector and then drying, and the cathode coating is prepared by coating the cathode slurry on the surfaces of the two sides of the cathode current collector and then drying.
In this embodiment, the positive electrode slurry includes the following components in parts by weight:
wherein the particle size distribution of lithium cobaltate was D50 ═ 6.5 μm.
In this embodiment, the negative electrode slurry includes the following components in parts by weight:
the particle size distribution of graphite was 13.5 μm or more, D50.
In this embodiment, the electrolyte disclosed in embodiment 1 of CN 111987362a is selected as the electrolyte, and the conductivity of the electrolyte is 9.83 mS/cm.
In this example, the method for assembling the battery case, the positive electrode cell, the negative electrode cell, the separator and the electrolyte into the lithium ion battery adopts the assembly method disclosed in example 1 in CN 110690506 a.
In this embodiment, the excess range of the designed negative electrode capacity of the lithium ion battery is 17.5%.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
The charge/10C discharge cycle performance of the lithium ion battery 6C provided in this example is shown in fig. 1.
As can be seen from fig. 1, the lithium ion battery provided in this embodiment has a long cycle function, and under a cycle regime of 6C charge/10C discharge, the cell capacity retention rate is only reduced to 80% when the cycle reaches 1000 cycles, so that the lithium ion battery has a better high-rate charge-discharge cycle performance and a longer service life.
Example 2
The embodiment provides a high-rate charge-discharge type lithium ion battery and battery slurry, wherein the slurry comprises anode slurry and cathode slurry; the lithium ion battery comprises a battery shell, and a positive electrode unit, a negative electrode unit, a diaphragm and electrolyte which are arranged in the battery shell; the battery shell is prepared by punching and cutting 5 layers of aluminum-plastic films, and the thickness of the aluminum-plastic films is 150 micrometers; the anode unit, the cathode unit and the diaphragm are soaked in the electrolyte; the positive electrode unit comprises 2 positive electrode subunits, and the negative electrode unit comprises 2 negative electrode subunits; the diaphragm is arranged between the adjacent positive electrode subunit and the negative electrode subunit, the material of the diaphragm is polypropylene, and the thickness of the diaphragm is 12 microns; the positive electrode subunit comprises a positive plate, a positive tab and insulating gummed paper, the negative electrode subunit comprises a negative plate, a negative tab and insulating gummed paper, and the thickness ratio of the positive electrode subunit to the negative electrode subunit is 0.8: 1; the positive plate comprises a positive current collector aluminum foil and positive coatings arranged on the two side surfaces of the positive current collector, and the negative plate comprises a negative current collector copper foil and negative coatings arranged on the two side surfaces of the negative current collector; the anode coating is prepared by coating the anode slurry on the surfaces of the two sides of the anode current collector and then drying, and the cathode coating is prepared by coating the cathode slurry on the surfaces of the two sides of the cathode current collector and then drying.
In this embodiment, the positive electrode slurry includes the following components in parts by weight:
wherein the particle size distribution of lithium cobaltate is D50 ═ 3.5 μm.
In this embodiment, the negative electrode slurry includes the following components in parts by weight:
the particle size distribution of graphite was 12 μm or more, as D50.
In this embodiment, the electrolyte disclosed in embodiment 3 of CN 111987362a is selected as the electrolyte, and the conductivity of the electrolyte is 9.76 mS/cm.
In this example, the method for assembling the battery case, the positive electrode cell, the negative electrode cell, the separator and the electrolyte into the lithium ion battery adopts the assembly method disclosed in example 1 in CN 110690506 a.
In this embodiment, the excess range of the designed negative electrode capacity of the lithium ion battery is 10%.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
The lithium ion battery provided by the embodiment has a long cycle function, and under a cycle system of 6C charging/10C discharging, the retention rate of the cell capacity is only reduced to 78% when the cycle reaches 1000 cycles, so that the lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
Example 3
The embodiment provides a high-rate charge-discharge type lithium ion battery and battery slurry, wherein the slurry comprises anode slurry and cathode slurry; the lithium ion battery comprises a battery shell, and a positive electrode unit, a negative electrode unit, a diaphragm and electrolyte which are arranged in the battery shell; the battery shell is prepared by punching and cutting 4 layers of aluminum-plastic films, and the thickness of the aluminum-plastic films is 80 microns; the anode unit, the cathode unit and the diaphragm are soaked in the electrolyte; the positive electrode unit comprises 5 positive electrode subunits, and the negative electrode unit comprises 5 negative electrode subunits; the diaphragm is arranged between the adjacent positive electrode subunit and the negative electrode subunit, the material of the diaphragm is polyethylene, and the thickness of the diaphragm is 18 microns; the positive electrode subunit comprises a positive plate, a positive tab and insulating gummed paper, the negative electrode subunit comprises a negative plate, a negative tab and insulating gummed paper, and the thickness ratio of the positive electrode subunit to the negative electrode subunit is 1.3: 1; the positive plate comprises a positive current collector aluminum foil and positive coatings arranged on the two side surfaces of the positive current collector, and the negative plate comprises a negative current collector copper foil and negative coatings arranged on the two side surfaces of the negative current collector; the anode coating is prepared by coating the anode slurry on the surfaces of the two sides of the anode current collector and then drying, and the cathode coating is prepared by coating the cathode slurry on the surfaces of the two sides of the cathode current collector and then drying.
In this embodiment, the positive electrode slurry includes the following components in parts by weight:
wherein the particle size distribution of lithium cobaltate is D50 ═ 7 μm.
In this embodiment, the negative electrode slurry includes the following components in parts by weight:
the particle size distribution of graphite was 15 μm or more, as D50.
In the embodiment, the electrolyte disclosed in embodiment 2 of CN 111987362a is selected as the electrolyte, and the conductivity of the electrolyte is 9.48 mS/cm.
In this example, the method for assembling the battery case, the positive electrode cell, the negative electrode cell, the separator and the electrolyte into the lithium ion battery adopts the assembly method disclosed in example 1 in CN 110690506 a.
In this embodiment, the excess range of the designed negative electrode capacity of the lithium ion battery is 25%.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
The lithium ion battery provided by the embodiment has a long cycle function, and under a cycle system of 6C charging/10C discharging, the retention rate of the cell capacity is only reduced to 75% when the cycle reaches 1000 cycles, so that the lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
Example 4
This example provides a high-rate charge-discharge lithium ion battery and a battery slurry, which are similar to those of example 1 except that the graphite particle size distribution in the negative electrode slurry of the battery slurry is changed to D50 ═ 10 μm, and therefore, the details are not repeated herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
The lithium ion battery provided by the embodiment has a long cycle function, and under a cycle system of 6C charging/10C discharging, the retention rate of the cell capacity is only reduced to 72% when the cycle reaches 1000 cycles, so that the lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
Example 5
This example provides a high-rate charge-discharge lithium ion battery and a battery slurry, which are similar to those of example 1 except that the graphite particle size distribution in the negative electrode slurry of the battery slurry is changed to D50 ═ 17 μm, and therefore, the details are not repeated herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
The lithium ion battery provided by the embodiment has a long cycle function, and under a cycle system of 6C charging/10C discharging, the retention rate of the cell capacity is only reduced to 73% when the cycle reaches 1000 cycles, so that the lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
Example 6
The present embodiment provides a high-rate charge-discharge type lithium ion battery and a battery slurry, except that the excess range of the designed capacity of the negative electrode of the lithium ion battery is changed to 8%, and other conditions are the same as those in embodiment 1, and therefore, the details are not described herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
The lithium ion battery provided by the embodiment has a long cycle function, and under a cycle system of 6C charging/10C discharging, the retention rate of the cell capacity is only reduced to 70% when the cycle reaches 1000 cycles, so that the lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
Example 7
The present embodiment provides a high-rate charge-discharge type lithium ion battery and a battery slurry, except that the excess range of the designed capacity of the negative electrode of the lithium ion battery is changed to 27%, and other conditions are the same as those in embodiment 1, and therefore, the details are not described herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
The lithium ion battery provided by the embodiment has a long cycle function, and under a cycle system of 6C charging/10C discharging, the retention rate of the cell capacity is only reduced to 71% when the cycle reaches 1000 cycles, so that the lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
Example 8
The present embodiment provides a high-rate charge-discharge type lithium ion battery and a battery slurry, except that the electrolyte of the lithium ion battery is changed to the electrolyte with a conductivity of 9.45mS/cm disclosed in embodiment 4 of CN 111987362a, and other conditions are the same as those in embodiment 1, and therefore, details are not described herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
The lithium ion battery provided by the embodiment has a long cycle function, and under a cycle system of 6C charging/10C discharging, the retention rate of the cell capacity is only reduced to 68% when the cycle reaches 1000 cycles, so that the lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
Example 9
The present embodiment provides a high-rate charge-discharge type lithium ion battery and a battery slurry, except that the weight part of graphite in the negative electrode slurry of the battery slurry is changed to 94 parts, and other conditions are the same as those in embodiment 1, and therefore, details are not described herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
Example 10
In this embodiment, except that the weight part of graphite in the negative electrode slurry of the battery slurry is changed to 99 parts, the other conditions are the same as those in embodiment 1, and thus the details are not repeated herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
Example 11
In this embodiment, except that the Super-P weight part in the negative electrode slurry of the battery slurry is changed to 1.2 parts, the other conditions are the same as those in embodiment 1, and thus the details are not repeated herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
Example 12
This embodiment provides a high-rate charge-discharge type lithium ion battery and a battery slurry, except that the Super-P weight part in the negative electrode slurry of the battery slurry is changed to 2.7 parts, and other conditions are the same as those in embodiment 1, and thus details are not described herein.
The lithium ion battery rate charge test data provided in this example are shown in table 1.
The lithium ion battery rate discharge test data provided in this example are shown in table 2.
Comparative example 1
The comparative example provides a lithium ion battery and a battery slurry, except that the weight part of lithium cobaltate in the positive electrode slurry of the battery slurry is changed to 95 parts, and other conditions are the same as those in example 1, so that the details are not repeated.
The lithium ion battery rate charge test data provided by this comparative example are shown in table 1.
The lithium ion battery rate discharge test data provided by this comparative example are shown in table 2.
Comparative example 2
The comparative example provides a lithium ion battery and a battery slurry, except that the weight part of lithium cobaltate in the positive electrode slurry of the battery slurry is changed to 99.5 parts, and other conditions are the same as those in example 1, so that the details are not repeated herein.
The lithium ion battery rate charge test data provided by this comparative example are shown in table 1.
The lithium ion battery rate discharge test data provided by this comparative example are shown in table 2.
TABLE 1
As can be seen from Table 1: the high-rate charge-discharge type lithium ion battery provided by the invention has an excellent quick charge function, the 6C constant current charge input rate can reach 76.1% at most, the minimum constant current charge time is only 8.7min, and the minimum total constant current and constant voltage charge time is only 32.9 min.
TABLE 2
As can be seen from Table 2: the high-rate charge-discharge type lithium ion battery provided by the invention has a rapid discharge function, and the maximum discharge capacity retention rate of 10C relative to 1C can reach 97.5%.
Therefore, the high-rate charge-discharge type lithium ion battery provided by the invention has an excellent quick charge function, the 6C constant current charge input rate can reach 76.1% at most, the minimum constant current charge time is only 8.7min, and the minimum total constant current and constant voltage charge time is only 32.9 min; the high-rate charge-discharge type lithium ion battery has a rapid discharge function, and the discharge capacity retention rate of 10C relative to 1C can reach 97.5 percent to the maximum extent; in addition, the high-rate charge-discharge type lithium ion battery has a long cycle function, the retention rate of the cell capacity is only reduced to 80% when the cycle reaches 1000 weeks under a 6C charge/10C discharge cycle system, and the high-rate charge-discharge type lithium ion battery has good high-rate charge-discharge cycle performance and long service life.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The battery slurry is characterized by comprising a positive electrode slurry and a negative electrode slurry;
the positive electrode slurry comprises the following components in parts by weight:
2. the battery paste of claim 1, wherein the lithium salt comprises lithium cobaltate;
preferably, the lithium salt has a particle size distribution D50 of 1.5 to 7 μm;
preferably, the positive electrode conductive agent includes carbon nanotubes;
preferably, the positive electrode binder includes polyvinylidene fluoride;
preferably, the organic solvent comprises N-methylpyrrolidone.
3. The battery paste according to claim 1 or 2, wherein the negative electrode paste comprises the following components in parts by weight:
4. the battery paste of claim 3, wherein the negative electrode conductive agent comprises conductive carbon black;
preferably, the thickener comprises carboxymethyl cellulose;
preferably, the negative electrode binder includes styrene butadiene rubber;
preferably, the particle size distribution D50 of the graphite is 12-15 μm.
5. A high-rate charge-discharge type lithium ion battery is characterized in that a positive plate of the lithium ion battery comprises a positive current collector and positive coatings arranged on the surfaces of two sides of the positive current collector; the positive electrode coating is prepared by coating the positive electrode slurry in the claim 1 or 2 on the two side surfaces of the positive electrode current collector and then drying;
the negative plate of the lithium ion battery comprises a negative current collector and negative coatings arranged on the surfaces of the two sides of the negative current collector; the negative electrode coating is prepared by coating the negative electrode slurry in the claim 3 or 4 on the two side surfaces of the negative electrode current collector and then drying.
6. The lithium ion battery of claim 5, wherein the lithium ion battery has a negative electrode design capacity in excess of 10% -25%;
preferably, the lithium ion battery comprises a battery shell, and a positive electrode unit, a negative electrode unit, a diaphragm and electrolyte which are arranged in the battery shell; the anode unit, the cathode unit and the diaphragm are soaked in the electrolyte; the positive electrode unit comprises at least 2 positive electrode subunits; the negative electrode unit comprises at least 2 negative electrode subunits; the diaphragm is arranged between the adjacent positive electrode subunit and the negative electrode subunit; the positive sub-unit comprises a positive plate, a positive lug and insulating gummed paper; the negative electrode subunit comprises a negative electrode sheet, a negative electrode lug and insulating gummed paper;
preferably, the thickness ratio of the positive electrode subunit to the negative electrode subunit is (0.8-1.3): 1.
7. The lithium ion battery of claim 5 or 6, wherein the positive current collector comprises aluminum foil;
preferably, the negative electrode current collector includes a copper foil.
8. The lithium ion battery according to claim 6 or 7, wherein the material of the separator comprises polyethylene and/or polypropylene;
preferably, the thickness of the separator is 12 to 18 μm.
9. The lithium ion battery of any one of claims 6-8, wherein the electrolyte comprises an electrolyte, an organic solvent, and an additive;
preferably, the conductivity of the electrolyte is more than or equal to 9.48 mS/cm.
10. The lithium ion battery according to any one of claims 6-9, wherein the battery shell is prepared by punching and cutting at least 3 layers of aluminum plastic films;
preferably, the thickness of the aluminum plastic film is 80-150 μm.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110931881A (en) * | 2019-12-02 | 2020-03-27 | 深圳市宜加新能源科技有限公司 | High-rate charge-discharge polymer lithium ion battery and manufacturing method thereof |
| CN111029566A (en) * | 2019-11-18 | 2020-04-17 | 淮北市锂动芯新能源科技有限公司 | Quick-charging flexible-package lithium ion battery |
| CN111224067A (en) * | 2019-11-18 | 2020-06-02 | 淮北市锂动芯新能源科技有限公司 | Flexible package lithium ion battery with high temperature and rate performance and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029566A (en) * | 2019-11-18 | 2020-04-17 | 淮北市锂动芯新能源科技有限公司 | Quick-charging flexible-package lithium ion battery |
| CN111224067A (en) * | 2019-11-18 | 2020-06-02 | 淮北市锂动芯新能源科技有限公司 | Flexible package lithium ion battery with high temperature and rate performance and preparation method thereof |
| CN110931881A (en) * | 2019-12-02 | 2020-03-27 | 深圳市宜加新能源科技有限公司 | High-rate charge-discharge polymer lithium ion battery and manufacturing method thereof |
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