CN106058245B - A kind of low-temperature lithium ion battery - Google Patents
A kind of low-temperature lithium ion battery Download PDFInfo
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- CN106058245B CN106058245B CN201610650308.XA CN201610650308A CN106058245B CN 106058245 B CN106058245 B CN 106058245B CN 201610650308 A CN201610650308 A CN 201610650308A CN 106058245 B CN106058245 B CN 106058245B
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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
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- 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
- H01M10/05—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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
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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
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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 discloses a kind of low-temperature lithium ion batteries, including anode, cathode and electrolyte；Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, and wherein doping mass percent of the iron manganese phosphate for lithium in positive active material is 5%~30%；Negative electrode active material used in cathode is graphite or carbon coating graphite material；Organic solvent used in electrolyte is the mixed system of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, propene carbonate, and the concentration of lithium ion is 0.9~1.3mol/L in electrolyte.0.3C discharge capacitance of the lithium ion battery being assembled under the conditions of -20 DEG C can reach 80% or more, and 0.3C discharge capacitance is 92% or more under the conditions of 0 DEG C；The discharge capability having under good security performance, high rate performance and cycle performance, especially low temperature environment is greatly improved, and is suitable for working under the adverse circumstances such as low temperature.
Description
Technical field
The invention belongs to technical field of lithium ion, and in particular to a kind of low-temperature lithium ion battery.
Background technique
In recent years, as the development of lithium ion battery is increasingly mature, use scope is more and more extensive, and the use of battery
Environment is relative complex changeable, therefore also higher to the performance requirement of lithium ion battery.In winter under the lower environment of relative temperature,
At a temperature of -20 DEG C even lower, need lithium ion battery that can work normally using equipment.Currently, lithium-ions battery
Cryogenic property it is relatively overproof, especially in 0 DEG C of low temperature environment below, the charging performance of power lithium-ion battery becomes different
Often difficult (precipitation of Li dendrite, inside battery may be short-circuit), the discharge performance of battery is also substantially decayed therewith, subsequent electrification
It learns performance to be all greatly reduced, therefore automobile-used lithium ion battery becomes urgently in the use research of cold district.Existing lithium
Ion battery is charged at low temperature or is run, i.e. under the conditions of low temperature environment charge and discharge, the internal resistance of battery increases battery, electric discharge electricity
Flattening bench reduce, can dischargeable capacity reduce, the efficiency for charge-discharge of battery is substantially reduced, and has certain damage to battery itself.
Currently, domestic market power battery is mainly ferric phosphate lithium cell, but the cryogenic property of LiFePO4 is its work
Bottleneck in terms of for power battery, LiFePO4 intrinsic conductivity is low, significantly limits its kinetic characteristics at low temperature,
And the energy density of ferric phosphate lithium cell is lower, is difficult to obtain breakthrough in capacity performance.Nickel-cobalt-manganese ternary material
Theoretical gram volume be 278mAh/g, operating voltage 3.65V, therefore the specific energy of nickel-cobalt-manganese ternary lithium ion battery can be done
To 180Wh/Kg, application potential is bigger.At special-purpose vehicle field (such as logistic car and sanitation cart), need specific energy is high to obtain ternary electricity
Pond is mating for it；In passenger car field, requirement to vehicle space and mileages of continuation determines the ternary battery of high-energy density
It is the direction of future development.
In the prior art, CN105529458A disclose a kind of lithium ion battery nickle cobalt lithium manganate/iron manganese phosphate for lithium it is multiple
The preparation method for closing positive electrode, is uniformly to be combined by iron manganese phosphate for lithium in nickel-cobalt-manganese ternary material surface, first by nickel
Cobalt-manganese ternary material, which is placed in the solution containing-COOH or-OH, to be dispersed；Iron manganese phosphate for lithium is placed in the solution containing-OH or-COOH
Dispersion；Two solution are mixed, and esterification catalyst is added and carries out esterification, it is compound just to obtain nickle cobalt lithium manganate/iron manganese phosphate for lithium
Pole material.Wherein, the molecular formula of nickel-cobalt-manganese ternary material is Li (NiaCobMn1-a-b)O2, wherein a < 1, b < 1, a+b < 1；The phosphorus
The molecular formula of sour manganese iron lithium can be LiMnyFe1-yPO4, 0.4≤y < 1 in formula.This method makes two kinds of materials by way of chemical bond
Material connection realization is uniformly compound, improves the safety of ternary material significantly under the premise of guaranteeing the high-energy density of ternary material
Performance；But there is no disclose the above-mentioned nickle cobalt lithium manganate/lithium of iron manganese phosphate for lithium composite positive pole as a positive electrode active material
The cryogenic property of ion battery.
Therefore, optimization is designed to the anode of lithium ion battery, cathode and electrolyte, so that researching and developing one kind can be low
The design scheme for making the chemical property of lithium ion battery get a promotion under the conditions of temperature is to solve lithium ion battery cryogenic property to lack
Sunken important channel.
Summary of the invention
The object of the present invention is to provide a kind of low-temperature lithium ion batteries, have excellent discharge performance under cryogenic.
In order to achieve the goal above, the technical scheme adopted by the invention is that:
A kind of low-temperature lithium ion battery, including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, wherein manganese phosphate
Doping mass percent of the iron lithium in positive active material is 5%~30%；
Negative electrode active material used in cathode is graphite or carbon coating graphite material；
Organic solvent used in electrolyte be ethylene carbonate (EC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC),
The mixed system of propene carbonate (PC), the concentration of lithium ion is 0.9~1.3mol/L in electrolyte.
In the positive active material, cobalt nickel lithium manganate ternary material LiNiaMnbCo1-a-bO2, wherein 0.3 < a < 0.8,
0.1 <b < 0.4, a+b < 1；Iron manganese phosphate for lithium is LiMnXFe1-XPO4, wherein 0.7 < x < 0.9.Preferably, x=0.8.
In the positive active material, gram volume > 145mAh/g of nickel-cobalt lithium manganate material；Gram of iron manganese phosphate lithium material
Capacity > 135mAh/g.
In negative electrode active material used in cathode, graphite used or the graphite material being wrapped by are artificial graphite.
Preferably, the negative electrode active material is second particle artificial graphite or carbon coating second particle artificial graphite material
Material.The second particle artificial graphite is the second particle as made of primary particle graphite bonding.
The median particle diameter D50 of the negative electrode active material is 13~23 μm.
In the carbon coating second particle artificial graphite material, surface coated carbon material is amorphous carbon material.It is described
Amorphous carbon material is soft carbon material or hard carbon material.
Organic solvent used in electrolyte consists of the following mass percentage components: ethylene carbonate 20%~40%,
Methyl ethyl carbonate 40%~60%, diethyl carbonate 10%~30%, propene carbonate 5%~10%.
Lithium salts used in electrolyte is at least one of lithium hexafluoro phosphate, LiBF4, di-oxalate lithium borate.
The preparation method of low-temperature lithium ion battery of the invention is to make above-mentioned material respectively according to conventional method in that art
Standby anode, cathode and electrolyte, are then assembled into lithium ion battery.
Low-temperature lithium ion battery of the invention, using the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping as positive-active
Substance, using graphite or carbon coating graphite material as negative electrode active material, with ethylene carbonate, methyl ethyl carbonate, diethyl carbonate,
The mixed system of propene carbonate is the organic solvent of electrolyte, 0.3C of the lithium ion battery being assembled under the conditions of -20 DEG C
Discharge capacitance can reach 80% or more, and 0.3C discharge capacitance is 92% or more under the conditions of 0 DEG C；With existing skill
Art is compared, and the discharge capability having under good security performance, high rate performance and cycle performance, especially low temperature environment obtains
Greatly promoted；The low-temperature lithium ion battery can be particularly suitable in normal use under conventional environment in adverse circumstances such as low temperature
Lower work.
Detailed description of the invention
Fig. 1 is the 0.3C low temperature discharge curve graph of low-temperature lithium ion battery of the invention under the conditions of -20 DEG C；
Fig. 2 is low-temperature lithium ion battery of the invention in 300 weeks cycle performance testing results of room temperature 1C charging/1C electric discharge
Schematic diagram.
Specific embodiment
The present invention is further illustrated With reference to embodiment.
In specific embodiment, gram volume > 145mAh/g of nickel-cobalt lithium manganate material used；Iron manganese phosphate lithium material
Gram volume > 133mAh/g.
In specific embodiment, second particle artificial graphite used is the FT-1 of Jiangxi Zi Chen Science and Technology Ltd.；Carbon
Coat the QCG-X of GT or Shanghai Shanshan Science and Technology Co., Ltd that second particle artificial graphite is Jiangxi Zi Chen Science and Technology Ltd..
Embodiment 1
The low-temperature lithium ion battery of the present embodiment, including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, wherein nickel cobalt manganese
Sour lithium ternary material is LiNiaMnbCo1-a-bO2, wherein a is 1/3, b 1/3；Iron manganese phosphate for lithium is LiMnXFe1-XPO4, wherein x
It is 0.8；Doping mass percent of the iron manganese phosphate for lithium in positive active material is 10%, remaining is nickle cobalt lithium manganate ternary material
Material；The gram volume of nickel-cobalt lithium manganate material plays: 145mAh/g；The gram volume of iron manganese phosphate lithium material used plays:
136mAh/g；
Negative electrode active material used in cathode is carbon coating second particle artificial graphite, and median particle diameter D50 is 20.5 μm, gram
Capacity plays: 350mAh/g；
Organic solvent used in electrolyte is the mixed system to consist of the following mass percentage components: ethylene carbonate
(EC) 25%, methyl ethyl carbonate (EMC) 50%, diethyl carbonate (DEC) 20%, propene carbonate (PC) 5%.Lithium in electrolyte
The concentration of ion is 1.2mol/L, and lithium salts used is lithium hexafluoro phosphate.
The low-temperature lithium ion battery of the present embodiment the preparation method comprises the following steps:
The preparation of anode sizing agent: dispersing binder Kynoar (PVDF) in N-Methyl pyrrolidone (NMP), to
PVDF sufficiently dissolves standing defoaming, and conductive agent carbon black (SP) then is added, and after being uniformly dispersed, positive active material, mixing is added
At anode sizing agent, viscosity 6000-8000mpa.s-1；
The preparation of negative electrode slurry: sodium carboxymethylcellulose (CMC) is dissolved in deionized water, and conductive agent charcoal is then added
Negative electrode active material, adjustment slurry viscosity to 2500mpa.s is added after being uniformly dispersed in black (SP)-1Afterwards, binder fourth is added
Benzene rubber (SBR), is prepared into negative electrode slurry；
By above-mentioned slurry, coated, dry, roll process prepares positive plate, negative electrode tab respectively, by gained positive plate, cathode
Piece is prepared into required size battery using Z-shaped lamination process, uses diaphragm for 20 μm of thickness of single layer PP diaphragm, after by entering
The processes such as shell, baking, fluid injection, chemical conversion, partial volume be fabricated to capacity be 5Ah battery to get low-temperature lithium ion battery.
Embodiment 2
The low-temperature lithium ion battery of the present embodiment, including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, wherein nickel cobalt manganese
Sour lithium ternary material is LiNiaMnbCo1-a-bO2, wherein a is 1/3, b 1/3；Iron manganese phosphate for lithium is LiMnXFe1-XPO4, wherein x
It is 0.8；Doping mass percent of the iron manganese phosphate for lithium in positive active material is 25%, remaining is nickle cobalt lithium manganate ternary material
Material；The gram volume of nickel-cobalt lithium manganate material plays: 145mAh/g；The gram volume of iron manganese phosphate lithium material used plays:
136mAh/g；
Negative electrode active material used in cathode is carbon coating second particle artificial graphite, and median particle diameter D50 is 20.5 μm, gram
Capacity plays: 350mAh/g；
Organic solvent used in electrolyte is the mixed system to consist of the following mass percentage components: ethylene carbonate
(EC) 25%, methyl ethyl carbonate (EMC) 50%, diethyl carbonate (DEC) 20%, propene carbonate (PC) 5%.Lithium in electrolyte
The concentration of ion is 1.2mol/L, and lithium salts used is lithium hexafluoro phosphate.
Above-mentioned material is fabricated to the laminated batteries (low-temperature lithium ion battery that the preparation method is the same as that of Example 1 that capacity is 5Ah
Preparation method) to get low-temperature lithium ion battery.
Embodiment 3
The low-temperature lithium ion battery of the present embodiment, including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, wherein nickel cobalt manganese
Sour lithium ternary material is LiNiaMnbCo1-a-bO2, wherein a is 1/3, b 1/3；Iron manganese phosphate for lithium is LiMnXFe1-XPO4, wherein x
It is 0.8；Doping mass percent of the iron manganese phosphate for lithium in positive active material is 20%, remaining is nickle cobalt lithium manganate ternary material
Material；The gram volume of nickel-cobalt lithium manganate material plays: 145mAh/g；The gram volume of iron manganese phosphate lithium material used plays:
136mAh/g；
Negative electrode active material used in cathode is carbon coating second particle artificial graphite, and median particle diameter D50 is 20.5 μm, gram
Capacity plays: 350mAh/g；
Organic solvent used in electrolyte is the mixed system to consist of the following mass percentage components: ethylene carbonate
(EC) 25%, methyl ethyl carbonate (EMC) 50%, diethyl carbonate (DEC) 20%, propene carbonate (PC) 5%.Lithium in electrolyte
The concentration of ion is 1.2mol/L, and lithium salts used is lithium hexafluoro phosphate.
Above-mentioned material is fabricated to the laminated batteries (low-temperature lithium ion battery that the preparation method is the same as that of Example 1 that capacity is 5Ah
Preparation method) to get low-temperature lithium ion battery.
Embodiment 4
The low-temperature lithium ion battery of the present embodiment, including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, wherein nickel cobalt manganese
Sour lithium ternary material is LiNiaMnbCo1-a-bO2, wherein a is 1/3, b 1/3；Iron manganese phosphate for lithium is LiMnXFe1-XPO4, wherein x
It is 0.8；Doping mass percent of the iron manganese phosphate for lithium in positive active material is 20%, remaining is nickle cobalt lithium manganate ternary material
Material；The gram volume of nickel-cobalt lithium manganate material plays: 145mAh/g；The gram volume of iron manganese phosphate lithium material used plays:
136mAh/g；
Negative electrode active material used in cathode is second particle artificial graphite, and median particle diameter D50 is 15.5 μm, gram volume hair
It waves: 340mAh/g；
Organic solvent used in electrolyte is the mixed system to consist of the following mass percentage components: ethylene carbonate
(EC) 25%, methyl ethyl carbonate (EMC) 50%, diethyl carbonate (DEC) 20%, propene carbonate (PC) 5%.Lithium in electrolyte
The concentration of ion is 1.2mol/L, and lithium salts used is lithium hexafluoro phosphate.
Above-mentioned material is fabricated to the laminated batteries (low-temperature lithium ion battery that the preparation method is the same as that of Example 1 that capacity is 5Ah
Preparation method) to get low-temperature lithium ion battery.
Embodiment 5
The low-temperature lithium ion battery of the present embodiment, including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, wherein nickel cobalt manganese
Sour lithium ternary material is LiNiaMnbCo1-a-bO2, wherein a is 1/3, b 1/3；Iron manganese phosphate for lithium is LiMnXFe1-XPO4, wherein x
It is 0.8；Doping mass percent of the iron manganese phosphate for lithium in positive active material is 5%, remaining is nickle cobalt lithium manganate ternary material
Material；The gram volume of nickel-cobalt lithium manganate material plays: 145mAh/g；The gram volume of iron manganese phosphate lithium material used plays:
136mAh/g；
Negative electrode active material used in cathode is carbon coating second particle artificial graphite, and median particle diameter D50 is 15 μm, gram appearance
Amount plays: 350mAh/g；
Organic solvent used in electrolyte is the mixed system to consist of the following mass percentage components: ethylene carbonate
(EC) 40%, methyl ethyl carbonate (EMC) 40%, diethyl carbonate (DEC) 10%, propene carbonate (PC) 10%.In electrolyte
The concentration of lithium ion is 0.9mol/L, and lithium salts used is lithium hexafluoro phosphate.
Above-mentioned material is fabricated to the laminated batteries (low-temperature lithium ion battery that the preparation method is the same as that of Example 1 that capacity is 5Ah
Preparation method) to get low-temperature lithium ion battery.
Embodiment 6
The low-temperature lithium ion battery of the present embodiment, including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, wherein nickel cobalt manganese
Sour lithium ternary material is LiNiaMnbCo1-a-bO2, wherein a is 1/3, b 1/3；Iron manganese phosphate for lithium is LiMnXFe1-XPO4, wherein x
It is 0.9；Doping mass percent of the iron manganese phosphate for lithium in positive active material is 30%, remaining is nickle cobalt lithium manganate ternary material
Material；The gram volume of nickel-cobalt lithium manganate material plays: 145mAh/g；The gram volume of iron manganese phosphate lithium material used plays:
138mAh/g；
Negative electrode active material used in cathode is carbon coating second particle artificial graphite, and median particle diameter D50 is 23 μm, gram appearance
Amount plays: 350mAh/g；
Organic solvent used in electrolyte is the mixed system to consist of the following mass percentage components: ethylene carbonate
(EC) 20%, methyl ethyl carbonate (EMC) 60%, diethyl carbonate (DEC) 12%, propene carbonate (PC) 8%.Lithium in electrolyte
The concentration of ion is 1.3mol/L, and lithium salts used is lithium hexafluoro phosphate.
Above-mentioned material is fabricated to the laminated batteries (low-temperature lithium ion battery that the preparation method is the same as that of Example 1 that capacity is 5Ah
Preparation method) to get low-temperature lithium ion battery.
Embodiment 7
The low-temperature lithium ion battery of the present embodiment, including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, wherein nickel cobalt manganese
Sour lithium ternary material is LiNiaMnbCo1-a-bO2, wherein a is 0.5, b 0.2；Iron manganese phosphate for lithium is LiMnXFe1-XPO4, wherein x
It is 0.7；Doping mass percent of the iron manganese phosphate for lithium in positive active material is 15%, remaining is nickle cobalt lithium manganate ternary material
Material；The gram volume of nickel-cobalt lithium manganate material plays: 150mAh/g；The gram volume of iron manganese phosphate lithium material used plays:
134mAh/g；
Negative electrode active material used in cathode is carbon coating second particle artificial graphite, and median particle diameter D50 is 18 μm, gram appearance
Amount plays: 350mAh/g；
Organic solvent used in electrolyte is the mixed system to consist of the following mass percentage components: ethylene carbonate
(EC) 20%, methyl ethyl carbonate (EMC) 40%, diethyl carbonate (DEC) 30%, propene carbonate (PC) 10%.In electrolyte
The concentration of lithium ion is 1.1mol/L, and lithium salts used is lithium hexafluoro phosphate.
Above-mentioned material is fabricated to the laminated batteries (low-temperature lithium ion battery that the preparation method is the same as that of Example 1 that capacity is 5Ah
Preparation method) to get low-temperature lithium ion battery.
Experimental example
Following performance test is carried out to low-temperature lithium ion battery obtained by embodiment 1-7, tests it under different temperatures environment
Discharge performance: first at normal temperature 0.5C is carried out charge and discharge 3 times, records constant volume discharge capacity, then the battery fully charged with 0.5C
Be respectively put into -20 DEG C, 0 DEG C, constant temperature for 24 hours, is then discharged to 3.0V with 0.3C in 55 DEG C of high-low temperature chambers, record discharge capacity.It should
After experiment, 2h is shelved into battery taking-up at normal temperature, then estimates battery core appearance.Test result is shown in Table 1.
0.3C low temperature discharge curve of the low-temperature lithium ion battery obtained by embodiment 1-7 under the conditions of -20 DEG C as shown in Figure 1,
It is as shown in Figure 2 in 300 weeks cycle performance testing results of room temperature 1C charging/1C electric discharge.
The Discharge test at different temperatures of low-temperature lithium ion battery obtained by table 1 embodiment
From table 1 and Fig. 1,2 as can be seen that the 0.3C of low-temperature lithium ion battery of the invention under the conditions of -20 DEG C discharges and holds
Amount conservation rate can reach 80% or more, and 0.3C discharge capacitance is 92% or more under the conditions of 0 DEG C；With prior art phase
Than having the discharge capability under good security performance, high rate performance and cycle performance, especially low temperature environment and obtaining greatly
Promotion.
Claims (3)
1. a kind of low-temperature lithium ion battery, it is characterised in that: including anode, cathode and electrolyte；
Positive active material used in anode is the cobalt nickel lithium manganate ternary material of iron manganese phosphate lithium doping, nickle cobalt lithium manganate ternary
Material is LiNiaMnbCo1-a-bO2, wherein 0.3 < a < 0.8,0.1 <b < 0.4, a+b < 1；Iron manganese phosphate for lithium is LiMnXFe1-XPO4,
Wherein 0.7 < x < 0.9, wherein doping mass percent of the iron manganese phosphate for lithium in positive active material is 10%~25%；
Negative electrode active material used in cathode is carbon coating second particle artificial graphite material, and surface coated carbon material is without fixed
Type carbon material, amorphous carbon material are soft carbon material or hard carbon material；
Organic solvent used in electrolyte is the mixture of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, propene carbonate
System, the mass percent of each component is in mixed system, ethylene carbonate 20%~25%, methyl ethyl carbonate 40%~50%,
Diethyl carbonate 20%~30%, propene carbonate 5%~10%, the concentration of lithium ion is 0.9~1.3mol/L in electrolyte.
2. low-temperature lithium ion battery according to claim 1, it is characterised in that: the median particle diameter of the negative electrode active material
D50 is 13~23 μm.
3. low-temperature lithium ion battery according to claim 1, it is characterised in that: lithium salts used in electrolyte is hexafluorophosphoric acid
At least one of lithium, LiBF4, di-oxalate lithium borate.
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| CN106410144A (en) * | 2016-11-02 | 2017-02-15 | 天津市捷威动力工业有限公司 | Lithium ion battery capable of improving low-temperature charging performance |
| CN106784646A (en) * | 2016-11-21 | 2017-05-31 | 深圳市锐拓新源科技有限公司 | A kind of preparation method of composite positive pole |
| CN107946646A (en) * | 2017-04-14 | 2018-04-20 | 云南锡业集团（控股）有限责任公司 | A kind of square low-temperature lithium ion battery and preparation method thereof |
| US11228028B2 (en) | 2017-12-27 | 2022-01-18 | Industrial Technology Research Institute | Cathode of lithium ion battery |
| CN108306015A (en) * | 2018-01-31 | 2018-07-20 | 北京国能电池科技股份有限公司 | Ternary active material, positive electrode, positive plate and preparation method thereof, lithium ion battery and preparation method thereof |
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| CN109256581B (en) * | 2018-10-23 | 2020-11-03 | 深圳市倍特力电池有限公司 | High energy density ultralow temperature lithium ion battery and negative plate |
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