CN107768667A - A kind of low-temperature circulating lithium iron phosphate dynamic battery and preparation method thereof - Google Patents
A kind of low-temperature circulating lithium iron phosphate dynamic battery and preparation method thereof Download PDFInfo
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- CN107768667A CN107768667A CN201710953174.3A CN201710953174A CN107768667A CN 107768667 A CN107768667 A CN 107768667A CN 201710953174 A CN201710953174 A CN 201710953174A CN 107768667 A CN107768667 A CN 107768667A
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- iron phosphate
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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
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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
- H01M10/058—Construction or manufacture
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention relates to technical field of lithium batteries, more particularly to a kind of low-temperature circulating lithium iron phosphate dynamic battery and preparation method thereof, the low-temperature circulating lithium iron phosphate dynamic battery, including positive pole, negative pole, barrier film and electrolyte, the positive pole, which includes positive pole, includes LiFePO4, and the volume average particle size distribution D50 of the LiFePO4 is 0.5~2 μm；The tap density of the LiFePO4 is 0.8~1.5g/cm3；The specific surface area of the LiFePO4 is 6~12m2/g；The negative pole includes green coke and crushes superhigh temperature graphitized material, and the particle diameter distribution D50 that the green coke crushes superhigh temperature graphitized material is 2~10 μm, and its tap density is 1.2~2g/cm3, its specific surface area is 0.5~1.5m2/ g, the present invention improve the low-temperature circulating performance of lithium battery by being modified to positive and negative pole material.
Description
Technical field
The present invention relates to technical field of lithium batteries, and in particular to a kind of low-temperature circulating lithium iron phosphate dynamic battery and its preparation
Method.
Background technology
The pure electric automobile product sold in current domestic new-energy automobile market is increasingly abundanter, but most of pure electricity
Charge-discharge performance of the electrical automobile below -20 DEG C is poor, in Northern Part of China, pure electric automobile at severe winter frequent " sitting "
Awkward problem.Research shows that, when temperature drops to -20 DEG C from 25 DEG C, the releasable electricity of automobile power cell institute can reduce
30%, the charging interval also can accordingly increase.Therefore, at low ambient temperatures, electric automobile operation generally occurs that charging is difficult, continuous
The problem of boat mileage significantly shrinks.Cryogenic property is as an important indicator for considering battery context applicability, it appears particularly heavy
Will.In use, battery polarization increases, platform reduces high current charge-discharge common batteries, prematurely reaches charge and discharge at low ambient temperatures
Piezoelectric voltage, cause battery charging and discharging capacity very few or can not put electricity directly.
The content of the invention
The problem of in order to overcome prior art to exist, an object of the present invention are to provide a kind of low-temperature circulating LiFePO4
Electrokinetic cell, it has good cyclical stability at low temperature.
The second object of the present invention is to provide a kind of preparation method of low-temperature circulating lithium iron phosphate dynamic battery.
To achieve these goals, the present invention provides a kind of low-temperature circulating lithium iron phosphate dynamic battery, including positive pole, negative
Pole, barrier film and electrolyte, the positive pole include plus plate current-collecting body and coated in the positive electrode on plus plate current-collecting body, the positive poles
Material includes positive electrode active materials, and the positive electrode active materials include LiFePO4, the volume average particle size of the LiFePO4
It is 0.5~2 μm to be distributed D50；The tap density of the LiFePO4 is 0.8~1.5g/cm3；The ratio surface of the LiFePO4
Product is 6~12m2/g；
The negative pole includes negative current collector and included coated in the negative material on negative current collector, the negative material
Negative active core-shell material, the negative active core-shell material include green coke and crush superhigh temperature graphitized material, and the green coke crushes superhigh temperature
The particle diameter distribution D50 of graphitized material is 2~10 μm, and its tap density is 1.2~2g/cm3, its specific surface area be 0.5~
1.5m2/g。
The present invention also provides a kind of preparation method of low-temperature circulating lithium iron phosphate dynamic battery, comprises the following steps：
1) positive electrode active materials, conductive agent and binding agent are well mixed in de-airing mixer, obtain positive electrode, will
In 3 addition positive electrodes of organic solvent point, after stirring, the anode sizing agent that viscosity is 6000~8000mPas is obtained,
Anode sizing agent is crossed into 100~120 mesh sieves, is then coated with least one side in plus plate current-collecting body, dry, roll, slitting, film-making,
Obtain lithium battery anode；
2) negative active core-shell material, conductive agent and binding agent are well mixed in de-airing mixer, obtain negative material, will
In 3 addition negative materials of organic solvent point, after stirring, the cathode size that viscosity is 6000~8000mPas is obtained,
Cathode size is crossed into 100~120 mesh sieves, is then coated with least one side in negative current collector, dry, roll, slitting, film-making,
Obtain lithium battery anode；
3) assembling of battery；
4) aging film forming, sealing.
Pass through above-mentioned technical proposal,
1st, the particle diameter of the invention by reducing positive electrode active materials, the specific surface area of positive electrode active materials is improved, is improved each
Contact area between material, so as to improve the electric conductivity of positive electrode, under conditions of battery high-temperature behavior is not influenceed, significantly
Improve the low temperature performance and low-temperature circulating performance of battery.
2nd, the present invention crushes superhigh temperature graphitized material as negative active core-shell material using green coke, is crushed by improving green coke
The compacted density and tap density of superhigh temperature graphitized material, its interlamellar spacing is reduced, improve space availability ratio, reach reduction internal resistance
Effect, so as to improve the low temperature charge-discharge performance of negative material and cycle performance.
3rd, the present invention by material by being pre-mixed stirring, then mediates, and finally finely dispersed method, can make different materials
Expect component mixing evenly, shorten incorporation time, improve production efficiency.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 be in the embodiment of the present invention 1 lithium battery temperature be -30 DEG C, discharge-rate be 0.5C under charge and discharge cycles
Curve map；
Embodiment
The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The end points of disclosed scope and any value are not limited to the accurate scope or value herein, these scopes or
Value should be understood to comprising the value close to these scopes or value.For number range, between the endpoint value of each scope, respectively
It can be combined with each other between the endpoint value of individual scope and single point value, and individually between point value and obtain one or more
New number range, these number ranges should be considered as specific open herein.
In order to optimize the charge-discharge performance of lithium battery at low temperature, the present invention provides a kind of lithium battery, and the lithium battery includes
Positive pole, negative pole, electrolyte, barrier film.
According to the present invention, the lithium battery anode includes plus plate current-collecting body and coated in the positive pole material on plus plate current-collecting body
Material, the positive electrode include positive electrode active materials, conductive agent, binding agent.
According to the present invention, material resistance be influence lithium battery low temperature performance an important factor for one of, pass through reduction
The particle diameter of positive electrode active materials, the specific surface area of positive electrode active materials is improved, the contact area between positive electrode can be improved,
So as to reduce the internal resistance of positive pole, the low temperature performance of positive pole is improved.In order to optimize the low temperature performance of lithium battery, it is described just
Pole active material includes LiFePO4, the particle diameter distribution D50 of the LiFePO4 is 0.5~2 μm, tap density be 0.8~
1.5g/cm3, specific surface area be 6~12m2/ g, it is further preferred that the particle diameter distribution D50 of the LiFePO4 is 0.6~1.8 μ
M, tap density is 0.85~1.26g/cm3, specific surface area 8m2/ g~10m2/g。
According to the present invention, the dosage of each material in positive electrode can be adjusted according to being actually needed, for example, at this
In a kind of embodiment being more highly preferred to of invention, in order to further improve obtained lithium iron phosphate dynamic battery at low temperature
Cycle performance, on the basis of the gross weight of anode material of lithium battery, the contents of the positive electrode active materials is 94~98 weight %,
The content of conductive agent is 1.0~3.5 weight %, the content of binding agent is 1.0~3.5 weight %.
According to the present invention, the conductive agent can be type commonly used in the art, for example, the conductive agent can select
From carbon black, electrically conductive graphite, CNT, graphene and carbon nano-fiber etc., under preferable case, the conductive agent is selected from acetylene
At least two during black, conductive black, graphite are dilute.
According to the present invention, the binding agent can be type commonly used in the art, for example, the binding agent can select
From polyvinyl alcohol, polytetrafluoroethylene (PTFE), sodium carboxymethylcellulose, TPO binding agent and Viton etc., under preferable case, institute
It is PVDF to state binding agent.
According to the present invention, in order to further optimize the low-temperature circulating performance of lithium battery, under preferable case, the lithium battery is just
The compacted density of pole is 1.5~3g/cm3, more preferably 2~2.5g/cm3。
According to the present invention, in order to further optimize the low-temperature circulating performance of lithium battery, under preferable case, the lithium battery is just
The surface density of pole is 120~150g/cm2, more preferably 130~140g/cm2。
The present invention also provides a kind of preparation method of lithium battery anode, comprises the following steps：
1), positive electrode active materials, conductive agent and binding agent are well mixed in de-airing mixer, obtain positive electrode；
2), positive electrode and Part I organic solvent are well mixed, positive pole is obtained and closes slurry lotion 1；
3), close slurry lotion 1 in positive pole to be well mixed with Part II organic solvent, obtain positive pole and close slurry lotion 2；
4), remaining organic solvent is added in positive electrode paste 2, regulation viscosity to 6000~8000mPas, crosses 100 mesh
Sieve obtain anode sizing agent；
5), by the anode sizing agent after sieving be coated on plus plate current-collecting body at least one side, dry, roll, slitting, film-making,
Obtain lithium battery anode.
In the present invention, by the way that positive electrode is pre-mixed into stirring, then mediate, last finely dispersed method, can make
Different materials component mixes evenly, improves the uniformity of positive pole, shortens incorporation time, improves production efficiency.
According to the present invention, the dosage of organic solvent and positive electrode can be adjusted according to being actually needed, preferable case
Under, the weight ratio of the positive electrode and organic solvent is 1：(0.8~1).
According to the present invention, the organic solvent can also be selected as type commonly used in the art, for example, can select
For ethylene carbonate, propene carbonate, 1-METHYLPYRROLIDONE etc., under preferable case, the organic solvent is N- methylpyrroles
Alkanone.
According to the present invention, in order to optimize the mixture homogeneity of positive electrode, in the preparation method of lithium battery anode, preferably
In the case of, on the basis of the gross weight of the organic solvent, the content of the Part I solvent is 30~50 weight %, described
The content of Part II solvent is 30~50 weight %.
According to the present invention, in order to optimize the mixture homogeneity of positive electrode, in the preparation method of lithium battery anode, preferably
In the case of, in step 1), described be mixed into is stirred, and wherein stir speed (S.S.) is 20~40r/min, and mixing time 60~
90min。
According to the present invention, in order to optimize the mixture homogeneity of positive electrode, in the preparation method of lithium battery anode, preferably
In the case of, in step 2), described be mixed into is stirred, wherein, whipping temp be 30~50 DEG C, mixing speed be 1000~
2200r/min, mixing time are 60~90min.
According to the present invention, in order to optimize the mixture homogeneity of positive electrode, in the preparation method of lithium battery anode, preferably
In the case of, in step 3), described be mixed into is stirred, whipping temp be 30~50 DEG C, mixing speed be 1800~
2400r/min, mixing time are 60~90min.
In the case of, according to the invention it is preferred to, the plus plate current-collecting body is 15~20 μm of carbon-coated aluminum foils of thickness.
The internal resistance of cathode of lithium battery is also another key factor for the performance for influenceing lithium battery low temperature discharge, passes through raising
The compacted density and tap density of negative active core-shell material, the interlamellar spacing that green coke crushes superhigh temperature graphitized material can be reduced, is carried
The space availability ratio of high negative active core-shell material, the electric conductivity of negative active core-shell material is improved, so as to improve negative pole low temperature performance.
According to the present invention, the cathode of lithium battery includes negative current collector and coated in the negative pole material on negative current collector
Material, the negative material include negative material and water, and the negative material includes negative active core-shell material, conductive agent, binding agent.
According to the present invention, the particle diameter that green coke crushes superhigh temperature graphitized material is an important factor for influenceing its space availability ratio
One of, in order to optimize the low temperature performance of lithium battery, the negative active core-shell material includes green coke and crushes superhigh temperature graphitization material
Material, the particle diameter distribution D50 that the green coke crushes superhigh temperature graphitized material are 2~10 μm, more preferably 3~8 μm.
According to the present invention, it can reduce green coke by improving tap density and compacted density and crush superhigh temperature graphitized material
Interlamellar spacing, improve the space availability ratio of negative active core-shell material, but if its tap density and compacted density are too high, then can lead
The fragility of negative pole is caused to become big, pole piece is broken when winding battery pole piece, can not only improve the low-temperature circulating of battery
Performance, even more so that the preparation of battery can not be completed.Under preferable case, the green coke crushes the jolt ramming of superhigh temperature graphitized material
Density is 1.2~2.0g/cm3, preferably 1.5~1.8g/cm3。
According to the present invention, the specific surface area that the green coke crushes superhigh temperature graphitized material is 0.5~1.5m2/ g, preferably
For 0.8-1.2m2/g
According to the present invention, the dosage of each material in negative material can be adjusted according to being actually needed, for example, at this
In a kind of embodiment being more highly preferred to of invention, in order to further improve obtained lithium iron phosphate dynamic battery at low temperature
Cycle performance, on the basis of the gross weight of lithium cell cathode material, the content of the negative active core-shell material is 92~97 weight %,
The content of conductive agent is 1~3 weight %, the content of binding agent is 2~5 weight %.
According to the present invention, the conductive agent can be type commonly used in the art, for example, the conductive agent can select
From acetylene black, conductive black, electrically conductive graphite, CNT, graphene and carbon nano-fiber etc., under preferable case, the conduction
Agent is acetylene black and/or conductive black.
According to the present invention, the binding agent can be type commonly used in the art, for example, the binding agent can select
From polyvinyl alcohol, polytetrafluoroethylene (PTFE), carboxymethyl cellulose, TPO binding agent, butadiene-styrene rubber and Viton etc., preferably feelings
Under condition, the binding agent is butadiene-styrene rubber and/or carboxymethyl cellulose.
According to the present invention, the dosage of negative material and water can be adjusted according to being actually needed, described under preferable case
The weight of negative material and water ratio is 1：(1~1.2).
According to the present invention, in order to further optimize the low-temperature circulating performance of lithium battery, under preferable case, the lithium battery is born
The compacted density of pole is 1~1.5g/cm3, more preferably 1.1~1.3g/cm3。
According to the present invention, in order to further optimize the low-temperature circulating performance of lithium battery, under preferable case, the lithium battery is born
The surface density of pole is 62~70g/cm2, more preferably 65~68g/cm2。
The present invention also provides the preparation method of described cathode of lithium battery, comprises the following steps：
1) negative active core-shell material, conductive agent and binding agent are well mixed in de-airing mixer, obtain material；
2) material and Part I water are well mixed, obtain negative pole and close slurry lotion 1；
3) negative pole is closed into slurry lotion 1 and Part II water is well mixed, obtained negative pole and close slurry lotion 2；
4) remaining water is added into negative pole to close in slurry lotion 2, regulation viscosity to 2000~4000mPas, crosses 120 purposes
Sieve obtains cathode size；
5) by the cathode size after sieving be coated on negative current collector at least one side, dry, roll, slitting, film-making, obtain
To cathode of lithium battery.
In the present invention, by the way that negative material is pre-mixed into stirring, then mediate, last finely dispersed method, can make
Different materials component mixes evenly, improves the uniformity of negative pole, shortens incorporation time, improves production efficiency.
According to the present invention, in the preparation process of cathode of lithium battery, under preferable case, using the gross weight of the water as base
Standard, the content of the Part I water is 20~40 weight %, and the content of the Part II solvent is 20~40 weight %.
It is described to be mixed into step 1) under preferable case in the preparation process of cathode of lithium battery according to the present invention
It is stirred, wherein, stir speed (S.S.) is 20~40r/min, and mixing time is 60~90min.
It is described to be mixed into step 2) under preferable case in the preparation process of cathode of lithium battery according to the present invention
It is stirred, wherein, mixing speed is 1000~1500r/min, and mixing time is 60~90min, and whipping temp is 20~50
℃。
It is described to be mixed into step 3) under preferable case in the preparation process of cathode of lithium battery according to the present invention
It is stirred, wherein, mixing speed is 1800~2200r/min, and mixing time is 60~90min, and whipping temp is 20~50
℃。
In the case of, according to the invention it is preferred to, the negative current collector is 8~12 μm of copper foils of thickness.
According to the present invention, the electrolyte is the mixed solution of electrolyte lithium salt and nonaqueous solvents, can use this area
Conventional nonaqueous electrolytic solution.For example electrolyte lithium salt is selected from lithium hexafluoro phosphate (LiPF6), lithium perchlorate, LiBF4, hexafluoro
One or more in arsenic acid lithium, lithium halide, chlorine lithium aluminate and fluorohydrocarbon base Sulfonic Lithium.The electrolyte can be that this area is conventional
The type used, such as can be dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), carbonic acid first third
Ester (MPC), dipropyl carbonate (DPC), ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), γ-fourth
At least one of lactone (γ-BL) and dimethyl carbonate (DMC) etc..In order to further optimize the low-temperature circulating of lithium battery
Can, under preferable case, the electrolyte includes ethylene carbonate, methyl ethyl carbonate, dimethyl carbonate.The migration rate of ion is
An important factor for influenceing battery low temperature performance, and electrolyte is an important factor for influenceing ion mobility, in order to optimize
The low temperature performance of lithium battery, it is further preferred that the mass ratio of ethylene carbonate, methyl ethyl carbonate, dimethyl carbonate is 1
: (0.8~1.2): (0.8~1.2), more preferably 1: 1: 1.The concentration of electrolyte is generally 1~1.3mol/L.
In order to further optimize the low-temperature circulating performance of lithium battery, under preferable case, the electrolyte also includes methane two
Sulfonic acid methylene ester, it is further preferred that on the basis of the gross weight of the electrolyte, the content of the methane-disulfonic acid methylene ester
For 0.5~3 weight %.
In the case of, according to the invention it is preferred to, the barrier film is the PE barrier films that thickness is 20~25 μm.
The present invention also provides a kind of preparation method of lithium battery, comprises the following steps：
1) preparation of positive pole, the preparation method of the positive pole are same as above；
2) preparation of negative pole, the preparation method of the negative pole are same as above；
3) electrolyte and encapsulated moulding are injected after being molded positive pole, negative pole and membrane winding；
4) aging, sealing.
According to the present invention, in the preparation process of lithium battery, under preferable case, in step 4), the aging film forming
Technique can be the conventional application method of this area, such as can be：Shelved at 60 DEG C 1 day.
According to the present invention, in the preparation process of lithium battery, under preferable case, in step 4), steel ball is beaten using vacuum
Mode sealed, under preferable case, during the sealing, the vacuum of lithium battery interior is -0.06MPa~-0.09MPa.
According to the preparation method of lithium battery provided by the invention, the coiling and molding technique, electrolyte injection technology and envelope
Filling moulding process can be with known to those skilled in the art, and the present invention will not be repeated here.
The present invention will be described in detail by way of examples below.LiFePO in following examples4Find pleasure in energy purchased from Jiangsu
Battery limited company, model N2；
Green coke crushes superhigh temperature graphitized material and is purchased from Shenzhen Bei Terui new energy materialses limited company, model
AGP-6F；
Conductive black is purchased from Switzerland Te Migao；Electrically conductive graphite is purchased from Switzerland Te Migao, model KS6；
1-METHYLPYRROLIDONE (NMP) is purchased from Nanjing Jin Long Chemical Co., Ltd.s；
Graphite is dilute to be purchased from Qingdao Hao Xin New Energy Technology Co., Ltd.s, model HX-G；
PVDF is in harmony (Shanghai) International Trading Company Ltd purchased from friend, model 5130；
Butadiene-styrene rubber (SBR) is in harmony (Shanghai) International Trading Company Ltd purchased from friend, model SN307R；
Carboxymethyl cellulose (cmc) is purchased from Hercules chemical industry (Jiangmen) Co., Ltd, model BVH8；、
LiPF6, methane-disulfonic acid methylene ester (MMDS), ethylene carbonate (EC), methyl ethyl carbonate (EMC), carbonic acid diformazan
Ester (DMC) is purchased from Guangzhou Tianci Advanced Materials Co., Ltd；
Embodiment 1
1st, the preparation of positive pole
By 95.5kg LiFePO4(D50 is 1 μm, tap density 1.02g/cm3, specific surface area 10m2/ g), 1kg leads
Electric carbon black, 1kg graphite are dilute, 2.5kg PVDF 5130 in vacuum≤- 0.08MPa vacuum drying oven, dried at 120 DEG C
300min；
By above-mentioned LiFePO4, conductive black, graphite is dilute, PVDF 5130 is added in de-airing mixer, 25r/min's
60min is stirred under rotating speed, obtains positive electrode；
Above-mentioned positive electrode and 30kg 1-METHYLPYRROLIDONEs (NMP) are stirred in de-airing mixer, obtained just
Slurry lotion 1 is closed in pole, and wherein stir speed (S.S.) is 1800r/min, and mixing time 90min, whipping temp is 40 DEG C；
Positive pole is closed into slurry lotion 1 and 30kgNMP to stir in de-airing mixer, positive pole is obtained and closes slurry lotion 2, wherein
Stir speed (S.S.) is 2200r/min, and mixing time 90min, whipping temp is 40 DEG C；
Closed to positive pole in slurry lotion 2 and add 40kgNMP, obtained the slurry that viscosity is 7200mPas, slurry is crossed into 120 mesh
Sieve, obtains anode sizing agent；
By the anode sizing agent after sieving coated in thickness be 15 μm carbon aluminium foil tow sides, then 120 DEG C drying,
Cutting obtains the positive pole that size is 2720mm × 155mm × 20 μm on cutting machine after roll-in under 1.6MPa pressure, described
The compacted density of positive pole is 2.3g/cm3, surface density 133g/cm2Positive plate.
2nd, the preparation of negative pole
95kg green cokes are crushed into superhigh temperature graphitized material, and (D50 is 5 μm, tap density 1.65g/cm3, specific surface area
For 1.0m2/ g), 1kg electrically conductive graphites (SP), 1.5kg carboxymethyl celluloses (CMC) and 2.5kg butadiene-styrene rubber (SBR) is in 30r/
60min is stirred under min rotating speed, obtains negative material；
By above-mentioned positive electrode and 36kg deionized waters, stirred in de-airing mixer, obtain negative pole and close slurry lotion
1, wherein stir speed (S.S.) is 1200r/min, and mixing time 90min, whipping temp is 40 DEG C；
Negative pole is closed into slurry lotion 1 and 36kg deionized waters to stir in de-airing mixer, negative pole is obtained and closes slurry lotion
2, wherein stir speed (S.S.) is 2000r/min, and mixing time 90min, whipping temp is 40 DEG C；
Closed to negative pole in slurry lotion 2 and add 48kg deionized waters, the slurry that viscosity is 3200mPas is obtained, by slurry mistake
120 mesh sieves, obtain cathode size；
Again by the cathode size after sieving be coated on 8 μm of copper foils of thickness tow sides, then 120 DEG C drying,
Cutting obtains the negative pole that size is 2900mm × 160mm × 8 μm on cutting machine after roll-in under 1.6MPa pressure, is pressed
Real density is 1.2g/cm3, surface density 66g/cm2Negative plate.
3rd, the assembling of battery
By LiPF6With methane-disulfonic acid methylene ester, ethylene carbonate (EC), methyl ethyl carbonate (EMC) and dimethyl carbonate
(DMC) it is configured to LiPF6Solution that concentration is 1mol/L (wherein, EC, EMC and DMC weight ratio are 1: 1: 1), wherein methane
The content of disulfonic acid methylene ester is the 2% of EC, EMC and DMC gross weight, obtains nonaqueous electrolytic solution.
Above-mentioned positive pole, the PE barrier films that thickness is 25 μm and negative pole are wound into square aluminum-shell battery with up- coiler stacking successively
IFP2714897-20, obtained electrode group is put into the battery case of one end open, injects above-mentioned nonaqueous electrolytic solution, Ran Hou
After 1 day is shelved at 60 DEG C, steel ball sealing is then played in the state of vacuum -0.08MPa, obtains lithium battery A1, its electrochemistry
Performance is as shown in table 1.
Embodiment 2
According to the method for embodiment 1, the difference is that, the preparation method of the positive pole is as follows：
By 94kg LiFePO4(D50 is 0.6 μm, tap density 0.85g/cm3, specific surface area 8m2/ g), 2kg it is conductive
Carbon black, 1kg graphite are dilute, 3kg PVDF 5130 in vacuum≤- 0.08MPa vacuum drying oven, dry 300min at 120 DEG C；
By above-mentioned LiFePO4, conductive black, graphite is dilute, PVDF 5130 is added in de-airing mixer, 40r/min's
75min is stirred under rotating speed, obtains positive electrode；
Above-mentioned positive electrode and 32kg 1-METHYLPYRROLIDONEs (NMP) are stirred in de-airing mixer, obtained just
Slurry lotion 1 is closed in pole, and wherein stir speed (S.S.) is 2200r/min, and mixing time 60min, whipping temp is 30 DEG C；
Positive pole is closed into slurry lotion 1 and 40kgNMP to stir in de-airing mixer, positive pole is obtained and closes slurry lotion 2, wherein
Stir speed (S.S.) is 2400r/min, and mixing time 60min, whipping temp is 30 DEG C；
Closed to positive pole in slurry lotion 2 and add 8kg NMP, obtained the slurry that viscosity is 8000mPas, slurry is crossed into 120 mesh
Sieve, obtains anode sizing agent.
By the anode sizing agent after sieving coated in thickness be 15 μm carbon aluminium foil tow sides, then 120 DEG C drying,
Cutting obtains the positive pole that size is 2720mm × 155mm × 20 μm on cutting machine after roll-in under 1.6MPa pressure, described
The compacted density of positive pole is 3g/cm3, surface density 150g/cm2Positive plate, obtain lithium battery A2, its chemical property such as table 1
It is shown.
Embodiment 3
According to the method for embodiment 1, the difference is that, the preparation method of the positive pole is as follows：
By 98kgLiFePO4(D50 is 1.8 μm, tap density 1.26g/cm3, specific surface area 6m2/ g), 0.5kg second
Acetylene black, 0.5kg graphite are dilute, 1kg PVDF 5130 in vacuum≤- 0.08MPa vacuum drying oven, dried at 120 DEG C
300min；
By above-mentioned LiFePO4, acetylene black, graphite is dilute, PVDF 5130 is added in de-airing mixer, in turning for 20r/min
The lower stirring 90min of speed, obtains positive electrode；
Above-mentioned positive electrode and 60kg 1-METHYLPYRROLIDONEs (NMP) are stirred in de-airing mixer, obtained just
Slurry lotion 1 is closed in pole, and wherein stir speed (S.S.) is 1000r/min, and mixing time 90min, whipping temp is 50 DEG C；
Positive pole is closed into slurry lotion 1 and 48kgNMP to stir in de-airing mixer, positive pole is obtained and closes slurry lotion 2, wherein
Stir speed (S.S.) is 1800r/min, and mixing time 90min, whipping temp is 50 DEG C；
Closed to positive pole in slurry lotion 2 and add 12kgNMP, obtained the slurry that viscosity is 6000mPas, slurry is crossed into 100 mesh
Sieve, obtains anode sizing agent.
By the anode sizing agent after sieving coated in thickness be 15 μm carbon aluminium foil tow sides, then 120 DEG C drying,
Cutting obtains the positive pole that size is 2720mm × 155mm × 20 μm on cutting machine after roll-in under 1.6MPa pressure, described
The compacted density of positive pole is 1.5g/cm3, surface density 120g/cm2Positive plate, obtain lithium battery A3, its chemical property is such as
Shown in table 1.
Embodiment 4
According to the method for embodiment 1, the difference is that, the preparation method of the positive pole is as follows：
By 94.5kg LiFePO4(D50 is 0.6 μm, tap density 0.8g/cm3, specific surface area 8m2/g)、0.5kg
Conductive black, 0.5kg graphite are dilute, 3.5kg PVDF 5130 in vacuum≤- 0.08MPa vacuum drying oven, at 120 DEG C
Dry 300min；
By above-mentioned LiFePO4, conductive black, graphite is dilute, PVDF 5130 is added in de-airing mixer, 40r/min's
75min is stirred under rotating speed, obtains positive electrode；
Above-mentioned positive electrode and 32kg 1-METHYLPYRROLIDONEs (NMP) are stirred in de-airing mixer, obtained just
Slurry lotion 1 is closed in pole, and wherein stir speed (S.S.) is 1500r/min, and mixing time 60min, whipping temp is 40 DEG C；
Positive pole is closed into slurry lotion 1 and 40kgNMP to stir in de-airing mixer, positive pole is obtained and closes slurry lotion 2, wherein
Stir speed (S.S.) is 2000r/min, and mixing time 90min, whipping temp is 40 DEG C；
Closed to positive pole in slurry lotion 2 and add 8kg NMP, obtained the slurry that viscosity is 7500mPas, slurry is crossed into 120 mesh
Sieve, obtains anode sizing agent.
By the anode sizing agent after sieving coated in thickness be 15 μm carbon aluminium foil tow sides, then 120 DEG C drying,
Cutting obtains the positive pole that size is 2720mm × 155mm × 20 μm on cutting machine after roll-in under 1.6MPa pressure, described
The compacted density of positive pole is 2g/cm3, surface density 130g/cm2Positive plate, obtain lithium battery A4, its chemical property such as table 1
It is shown.
Embodiment 5
According to the method for embodiment 1, the difference is that, the preparation method of the positive pole is as follows：
By 95kg LiFePO4(D50 is 2 μm, tap density 1.5g/cm3, specific surface area 6m2/ g), 2kg conduction charcoals
It is black, 1.5kg graphite is dilute, 1.5kg PVDF 5130 in vacuum≤- 0.08MPa vacuum drying oven, dried at 120 DEG C
300min；
By above-mentioned LiFePO4, conductive black, graphite is dilute is added in de-airing mixer, stirred under 40r/min rotating speed
75min, obtain positive electrode；
Above-mentioned positive electrode and 32kg 1-METHYLPYRROLIDONEs (NMP) are stirred in de-airing mixer, obtained just
Slurry lotion 1 is closed in pole, and wherein stir speed (S.S.) is 2000r/min, and mixing time 75min, whipping temp is 40 DEG C；
Positive pole is closed into slurry lotion 1 and 40kgNMP to stir in de-airing mixer, positive pole is obtained and closes slurry lotion 2, wherein
Stir speed (S.S.) is 2000r/min, and mixing time 75min, whipping temp is 40 DEG C；
Closed to positive pole in slurry lotion 2 and add 8kg NMP, obtained the slurry that viscosity is 6800mPas, slurry is crossed into 120 mesh
Sieve, obtains anode sizing agent.
By the anode sizing agent after sieving coated in thickness be 15 μm carbon aluminium foil tow sides, then 120 DEG C drying,
Cutting obtains the positive pole that size is 2720mm × 155mm × 20 μm on cutting machine after roll-in under 1.6MPa pressure, described
The compacted density of positive pole is 2.5g/cm3, surface density 140g/cm2Positive plate, obtain lithium battery A5, its chemical property is such as
Shown in table 1.
Embodiment 6
According to the method for embodiment 1, the difference is that, the preparation method of the negative pole is as follows：
By 92kg modified graphites material, (D50 is 3 μm, and its tap density is 1.5g/cm3, its specific surface area is 1.1m2/g)、
3kg electrically conductive graphites (SP), 5kg carboxymethyl celluloses (CMC) stir 60min under 25r/min rotating speed, obtain negative material；
By above-mentioned positive electrode and 30kg deionized waters, stirred in de-airing mixer, obtain negative pole and close slurry lotion
1, wherein stir speed (S.S.) is 1200r/min, and mixing time 75min, whipping temp is 40 DEG C；
Negative pole is closed into slurry lotion 1 and 50kg deionized waters to stir in de-airing mixer, negative pole is obtained and closes slurry lotion
2, wherein stir speed (S.S.) is 2000r/min, and mixing time 90min, whipping temp is 40 DEG C；
Closed to negative pole in slurry lotion 2 and add 20kg deionized waters, the slurry that viscosity is 2800mPas is obtained, by slurry mistake
120 mesh sieves, obtain cathode size；
Again by the cathode size after sieving be coated on 8 μm of copper foils of thickness tow sides, then 120 DEG C drying,
Cutting obtains the negative pole that size is 2900mm × 160mm × 8 μm on cutting machine after roll-in under 1.6MPa pressure, is pressed
Real density is 1.1g/cm3, surface density 65g/cm2Negative plate, obtain lithium battery A6, its chemical property is as shown in table 1.
Embodiment 7
According to the method for embodiment 1, the difference is that, the preparation method of the negative pole is as follows：
97kg green cokes are crushed into superhigh temperature graphitized material, and (D50 is 8 μm, and its tap density is 1.8g/cm3, it compares surface
Product is 0.9m2/ g), 1kg electrically conductive graphites (SP), 2kg butadiene-styrene rubber stir 60min under 25r/min rotating speed, obtain negative pole material
Material；
By above-mentioned positive electrode and 60kg deionized waters, stirred in de-airing mixer, obtain negative pole and close slurry lotion
1, wherein stir speed (S.S.) is 1400r/min, and mixing time 75min, whipping temp is 40 DEG C；
Negative pole is closed into slurry lotion 1 and 40kg deionized waters to stir in de-airing mixer, negative pole is obtained and closes slurry lotion
2, wherein stir speed (S.S.) is 2100r/min, and mixing time 75min, whipping temp is 40 DEG C；
Closed to negative pole in slurry lotion 2 and add 20kg deionized waters, the slurry that viscosity is 3600mPas is obtained, by slurry mistake
120 mesh sieves, obtain cathode size；
Again by the cathode size after sieving be coated on 8 μm of copper foils of thickness tow sides, then 120 DEG C drying,
Cutting obtains the negative pole that size is 2900mm × 160mm × 8 μm on cutting machine after roll-in under 1.6MPa pressure, is pressed
Real density is 1.3g/cm3, surface density 68g/cm2Negative plate, obtain lithium battery A7, its chemical property is as shown in table 1.
Embodiment 8
According to the method for embodiment 1, the difference is that, the preparation method of the negative pole is as follows：
95kg green cokes are crushed into superhigh temperature graphitized material, and (D50 is 2 μm, and its tap density is 1.2g/cm3, it compares surface
Product is 1.2m2/ g), 2kg carboxymethyl celluloses (CMC) and 3kg butadiene-styrene rubber (SBR) stirs under 20r/min rotating speed
60min, obtain negative material；
By above-mentioned positive electrode and 30kg deionized waters, stirred in de-airing mixer, obtain negative pole and close slurry lotion
1, wherein stir speed (S.S.) is 1000r/min, and mixing time 90min, whipping temp is 30 DEG C；
Negative pole is closed into slurry lotion 1 and 50kg deionized waters to stir in de-airing mixer, negative pole is obtained and closes slurry lotion
2, wherein stir speed (S.S.) is 1800r/min, and mixing time 90min, whipping temp is 30 DEG C；
Closed to negative pole in slurry lotion 2 and add 20kg deionized waters, the slurry that viscosity is 2000mPas is obtained, by slurry mistake
120 mesh sieves, obtain cathode size；
Again by the cathode size after sieving be coated on 8 μm of copper foils of thickness tow sides, then 120 DEG C drying,
Cutting obtains the negative pole that size is 2900mm × 160mm × 8 μm on cutting machine after roll-in under 1.6MPa pressure, is pressed
Real density is 1g/cm3, surface density 62g/cm2Negative plate, obtain lithium battery A8, its chemical property is as shown in table 1.
Embodiment 9
According to the method for embodiment 1, the difference is that, the preparation method of the negative pole is as follows：
95kg green cokes are crushed into superhigh temperature graphitized material, and (D50 is 10 μm, and its tap density is 2g/cm3, it compares surface
Product is 0.8m2/ g), 1kg electrically conductive graphites (SP), 1.5kg carboxymethyl celluloses (CMC) and 2.5kg butadiene-styrene rubber (SBR) is in 40r/
90min is stirred under min rotating speed, obtains negative material；
By above-mentioned positive electrode and 40kg deionized waters, stirred in de-airing mixer, obtain negative pole and close slurry lotion
1, wherein stir speed (S.S.) is 1500r/min, and mixing time 60min, whipping temp is 50 DEG C；
Negative pole is closed into slurry lotion 1 and 40kg deionized waters to stir in de-airing mixer, negative pole is obtained and closes slurry lotion
2, wherein stir speed (S.S.) is 2200r/min, and mixing time 60min, whipping temp is 50 DEG C；
Closed to negative pole in slurry lotion 2 and add 20kg deionized waters, the slurry that viscosity is 4000mPas is obtained, by slurry mistake
120 mesh sieves, obtain cathode size；
Again by the cathode size after sieving be coated on 8 μm of copper foils of thickness tow sides, then 120 DEG C drying,
Cutting obtains the negative pole that size is 2900mm × 160mm × 8 μm on cutting machine after roll-in under 1.6MPa pressure, is pressed
Real density is 1.5g/cm3, surface density 70g/cm2Negative plate, obtain lithium battery A9, its chemical property is as shown in table 1.
Embodiment 10
According to the method for embodiment 1, the difference is that, the collocation method of the electrolyte is as follows：
By LiPF6With methane-disulfonic acid methylene ester, ethylene carbonate (EC), methyl ethyl carbonate (EMC) and dimethyl carbonate
(DMC) it is configured to LiPF6(wherein, EC, EMC and DMC weight ratio are 1 to the solution that concentration is 1.1mol/L：0.8：0.8), its
The content of middle methane-disulfonic acid methylene ester is the 0.5% of EC, EMC and DMC gross weight, obtains nonaqueous electrolytic solution, obtains lithium battery
A10, its chemical property are as shown in table 1.
Embodiment 11
According to the method for embodiment 1, the difference is that, the collocation method of the electrolyte is as follows：
By LiPF6With methane-disulfonic acid methylene ester, ethylene carbonate (EC), methyl ethyl carbonate (EMC) and dimethyl carbonate
(DMC) it is configured to LiPF6(wherein, EC, EMC and DMC weight ratio are 1 to the solution that concentration is 1.3mol/L：1.2：1.2), its
The content of middle methane-disulfonic acid methylene ester is the 3% of EC, EMC and DMC gross weight, obtains nonaqueous electrolytic solution, obtains lithium battery
A11, its chemical property are as shown in table 1.
Comparative example 1
According to the method for embodiment 1, the difference is that, the positive electrode active materials LiFePO4Particle diameter D50 for 2.5 μm, shake
Real density is 0.72g/cm3, specific surface area 6.3m2/ g, lithium battery B1 is obtained, its chemical property is as shown in table 1.
Comparative example 2
According to the method for embodiment 1, the difference is that, the positive electrode active materials LiFePO4Particle diameter D50 for 0.2 μm, shake
Real density is 1.69g/cm3, specific surface area 15m2/ g, lithium battery B2 is obtained, its chemical property is as shown in table 1.
Comparative example 3
According to the method for embodiment 1, the difference is that, the negative active core-shell material green coke crushes superhigh temperature graphitized material
Particle diameter D50 is 1 μm, tap density 2.3g/cm3, specific surface area 1.5m2/ g, lithium battery B3 is obtained, its chemical property is such as
Shown in table 1.
Comparative example 4
According to the method for embodiment 1, the difference is that, the negative active core-shell material green coke crushes superhigh temperature graphitized material
Particle diameter D50 is 12 μm, tap density 1.2g/cm3, specific surface area 0.5m2/ g, lithium battery B4 is obtained, its chemical property is such as
Shown in table 1.
Comparative example 5
According to the method for embodiment 1, the difference is that, methane-disulfonic acid methylene ester is not contained in the electrolyte, obtains lithium
Battery B5, its chemical property are as shown in table 1.
Comparative example 6
According to the method for embodiment 1, the difference is that, the preparation method of anode sizing agent and cathode size is different, specific as follows：
1st, the preparation of positive pole
By 95.5kg LiFePO4(D50 is 1 μm, tap density 1.02g/cm3, specific surface area 10m2/ g), 1kg leads
Electric carbon black, 1kg graphite are dilute, 2.5kg PVDF 5130 in vacuum≤- 0.08MPa vacuum drying oven, dried at 120 DEG C
300min；
By above-mentioned LiFePO4, conductive black, graphite are dilute and 100kg NMP are well mixed in de-airing mixer, cross 120
Mesh sieve, obtain anode sizing agent；
The painting method of anode sizing agent is the same as embodiment 1.
2nd, the preparation of negative pole
95kg green cokes are crushed into superhigh temperature graphitized material, and (D50 is 5 μm, tap density 1.65g/cm3, specific surface area
For 1.0m2/ g), 1kg electrically conductive graphites (SP), 1.5kg carboxymethyl celluloses (CMC), 2.5kg butadiene-styrene rubber (SBR) and 120kg water
Stirred in de-airing mixer, slurry is crossed into 120 mesh sieves, obtains cathode size；
The painting method of cathode size is the same as embodiment 1.
3rd, the assembly method of battery obtains lithium battery B6, its chemical property is as shown in table 1 with embodiment 1.
Method of testing：
1st, low temperature charge-discharge performance：At -30 DEG C, charged with constant voltage charging method, limitation electric current is 0.5C, is terminated
Voltage is 3.5V, is discharged in a manner of constant-current discharge, discharge current 0.5C, and the blanking voltage of electric discharge is 2.5 volts, circulation
250 times, respectively calculate the 1st discharge capacity C1, the 250th discharge capacity C2, circulation 250 times after capability retention R.
The chemical property of each lithium battery in the embodiment 1~11 of table 1 and comparative example 1~6
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (10)
1. a kind of low-temperature circulating lithium iron phosphate dynamic battery, including positive pole, negative pole, barrier film and electrolyte, it is characterised in that described
Anode material of lithium battery includes positive electrode active materials, conductive agent, binding agent；
The positive pole includes plus plate current-collecting body and includes positive pole coated in the positive electrode on plus plate current-collecting body, the positive electrode
Active material, the positive electrode active materials include LiFePO4, and the volume average particle size distribution D50 of the LiFePO4 is 0.5
~2 μm；The tap density of the LiFePO4 is 0.8~1.5g/cm3；The specific surface area of the LiFePO4 is 6~12m2/g；
The negative pole includes negative current collector and includes negative pole coated in the negative material on negative current collector, the negative material
Active material, the negative active core-shell material include green coke and crush superhigh temperature graphitized material, and the green coke crushes superhigh temperature graphite
The particle diameter distribution D50 for changing material is 2~10 μm, and its tap density is 1.2~2g/cm3, its specific surface area is 0.5~1.5m2/g。
2. low-temperature circulating lithium iron phosphate dynamic battery according to claim 1, wherein, the particle diameter distribution of the LiFePO4
D50 is 0.6~1.8 μm；And/or
The tap density of the LiFePO4 is 0.85~1.26g/cm3；And/or
The specific surface area of the LiFePO4 is 8~10m2/g。
3. low-temperature circulating lithium iron phosphate dynamic battery according to claim 1 or 2, wherein, the green coke crushes superhigh temperature
The particle diameter distribution D50 of graphitized material is 3~8 μm；And/or
The tap density that the green coke crushes superhigh temperature graphitized material is 1.5~1.8g/cm3；And/or
The specific surface area that the green coke crushes superhigh temperature graphitized material is 0.8-1.2m2/g。
4. low-temperature circulating lithium iron phosphate dynamic battery according to claim 1, wherein, the compacted density of the positive pole is
1.5~3g/cm3, surface density is 120~150g/cm2。
5. the low-temperature circulating lithium iron phosphate dynamic battery according to claim 1 or 4, wherein, the pressure of the cathode of lithium battery
Real density is 1.1~1.3g/cm3, surface density 65-68g/cm2。
6. low-temperature circulating lithium iron phosphate dynamic battery according to claim 1, wherein, the electrolyte includes ethylene carbonate
Ester, methyl ethyl carbonate, dimethyl carbonate；
Wherein, ethylene carbonate, methyl ethyl carbonate, the mass ratio of dimethyl carbonate are 1:(0.8~1.2):(0.8~1.2).
7. low-temperature circulating lithium iron phosphate dynamic battery according to claim 6, wherein, the electrolyte also includes methane two
Sulfonic acid methylene ester, on the basis of the gross weight of the electrolyte, the content of the methane-disulfonic acid methylene ester is 0.5~3 weight
Measure %.
8. a kind of preparation method of low-temperature circulating lithium iron phosphate dynamic battery according to claim 1~7 any one, its
It is characterised by, comprises the following steps：
1) positive electrode active materials, conductive agent and binding agent are well mixed in de-airing mixer, obtain positive electrode, will be organic
In 3 addition positive electrodes of solvent point, after stirring, the anode sizing agent that viscosity is 6000~8000mPas is obtained, will just
Pole slurry crosses 100~120 mesh sieves, is then coated with least one side in plus plate current-collecting body, dry, roll, slitting, film-making, obtain
Lithium battery anode；
2) negative active core-shell material, conductive agent and binding agent are well mixed in de-airing mixer, obtain negative material, will be organic
In 3 addition negative materials of solvent point, after stirring, the cathode size that viscosity is 6000~8000mPas is obtained, will be negative
Pole slurry crosses 100~120 mesh sieves, is then coated with least one side in negative current collector, dry, roll, slitting, film-making, obtain
Lithium battery anode；
3) assembling of battery；
4) aging film forming, sealing.
9. the preparation method of low-temperature circulating lithium iron phosphate dynamic battery according to claim 8, wherein, in step 1),
The preparation method of the anode sizing agent is：A, positive electrode active materials, conductive agent and binding agent are mixed in de-airing mixer
It is even, obtain positive electrode；
B, positive electrode and Part I organic solvent are well mixed, obtain positive pole and close slurry lotion 1；
C, close slurry lotion 1 in positive pole to be well mixed with Part II organic solvent, obtain positive pole and close slurry lotion 2；
D, remaining organic solvent is added in positive electrode paste 2, regulation viscosity to 6000~8000mPas, crosses 100~120 mesh
Sieve obtain anode sizing agent；
Wherein, the weight ratio of the positive electrode and organic solvent is 1：(0.8~1)；And/or
On the basis of the gross weight of the organic solvent, the content of the Part I solvent is 30~50 weight %, described the
The content of two partial solvents is 30~50 weight %.
10. the preparation method of low-temperature circulating lithium iron phosphate dynamic battery according to claim 9, wherein, in step 1),
The preparation method of the cathode size is：
A, negative active core-shell material, conductive agent and binding agent are well mixed in de-airing mixer, obtain negative material；
B, material and Part I water are well mixed, obtain negative pole and close slurry lotion 1；
C, negative pole is closed into slurry lotion 1 and Part II water is well mixed, obtained negative pole and close slurry lotion 2；
D, remaining water is added into negative pole to close in slurry lotion 2, regulation viscosity to 2000~4000mPas, crosses sieving for 120 mesh
To cathode size；
Wherein, the weight ratio of the negative material and water is 1：(1~1.2), on the basis of the gross weight of the water, described first
The content of part water is 20~40 weight %, and the content of the Part II solvent is 20~40 weight %.
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