CN102646813A - Manufacturing method of lithium titanate lithium ion battery - Google Patents
Manufacturing method of lithium titanate lithium ion battery Download PDFInfo
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- CN102646813A CN102646813A CN2012100868833A CN201210086883A CN102646813A CN 102646813 A CN102646813 A CN 102646813A CN 2012100868833 A CN2012100868833 A CN 2012100868833A CN 201210086883 A CN201210086883 A CN 201210086883A CN 102646813 A CN102646813 A CN 102646813A
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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
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- 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 invention relates to a manufacturing method of a lithium titanate lithium ion battery, and according to the method, the manufacturing cost is obviously reduced on the premise of guaranteeing battery performance. The manufacturing method comprises the following steps of: anode stuff preparation, and cathode stuff preparation which is obtained by taking dry powder of cathode stuff as the total weight, preparing 90-95 parts of lithium titanate, 3-6 parts of mixture of VGCF (Vapor Grown Carbon Fiber) and carbon black SUPER-P and 2-5 parts of water base cement LA-132, adding the substances into deionized water together, and stirring in vacuum; and then the battery is obtained through the steps of positive plate and negative plate preparation, battery core preparation, battery forming and the like. According to the method, the deionized water is used as a cathode solvent, at the same time a key technical difficulty in guaranteeing the battery performance when anion water is used as a solvent is solved, and the manufacturing cost of the battery is greatly reduced. Ballooning in a cyclic process of the battery is completely solved. The technical targets of low cost and high performance of the lithium ion battery are realized.
Description
Technical field
The present invention relates to a kind of manufacture method of lithium ion battery, specifically, relate to a kind of use lithium titanate be negative active core-shell material lithium ion battery manufacture method.
Background technology
Present commercial lithium ion battery negative material is embedding lithium material with carbon element mostly; Because the current potential of the current potential of carbon electrode and lithium metal is very approaching behind the embedding lithium; When over-charging of battery; Carbon electrodes is prone to the precipitating metal lithium, and it and electrolyte reaction produce combustible gas mixture, thereby cause very big potential safety hazard for battery, particularly electrokinetic cell.Simultaneously, also there is the common imbedding problem of electrolyte in graphite electrode, and this also will influence the cyclical stability of electrode.Therefore, seek than carbon negative pole under positive slightly current potential, embed lithium, cheap and easy to get, safe and reliable novel negative material is necessary.Wherein electronegative potential transition metal oxide and composite oxides have caused people's extensive attention, lithium titanate (Li as the negative material of lithium ion battery
4Ti
5O
12) be one of material of wherein extensively being paid close attention to.
Compare the Li of spinel-type with material with carbon element
4Ti
5O
12Have remarkable advantages: 1, it is zero strain material, good cycle; 2, discharging voltage balance, and electrolyte is unlikely decomposes, and improves the lithium battery security performance; 3, compare with carbon cathode material, lithium titanate has high lithium ion diffusion coefficient and (is 2*10-8cm
2/ s), but high power charging-discharging etc.4, the electromotive force of lithium titanate is difficult for producing the lithium dendrite arm than the height of pure metal lithium, for the safety that ensures lithium battery provides the foundation.5, cycle performance is excellent, and lithium titanate lithium ion battery cycle performance can reach more than 20000 times.
Not enough below present commercial lithium titanate lithium ion battery exists:
1, energy density is low, and volumetric specific energy and specific energy are carbon negative electrode lithium ion battery 1/2, so the battery cost of manufacture is higher.Reason mainly is because the lithium titanate anode material particle diameter is a nanoscale, and the quantity of solvent of using in the configuration cathode size process is more, and solvent is the NMP organic solvent, and the NMP market price causes the battery manufacturing cost higher at 20 yuan/KG.
2, battery easy inflatable in cyclic process, reason possibly be that the remaining steam of environment is heated or chemical reaction causes.Domestic a lot of producer is from the problem of chemical synthesis technology solution lithium titanate lithium ion battery aerogenesis formation process, but effect is not fine, and that particularly on the flexible package liquid lithium ionic cell, embodies is more obvious.
Thereby above-mentioned two hang-ups are technical bottlenecks of lithium titanate lithium ion battery industrialization.
Summary of the invention
The object of the present invention is to provide a kind of lithium titanate lithium ion battery manufacture method, this method has significantly reduced cost of manufacture under the prerequisite that guarantees battery performance.
Technical scheme of the present invention is: a kind of manufacture method of lithium titanate lithium ion battery, and step comprises:
(1) preparation of anode sizing agent: the dry powder with anode sizing agent is total weight; Join the positive active material of getting 75～95 parts, 2～5 parts anodal conductive agent, 2～5 parts anodal binding agent; Adopt the three-dimensional hybrid mixer to stir positive active material and anodal conductive agent, anodal binding agent dry powder earlier, join in the nmp solvent together again and obtain anode sizing agent through vacuum stirring;
(2) preparation of cathode size: the dry powder with cathode size is total weight; Join the lithium titanate of getting 90～95 parts, 3～6 parts VGCF and the mix products of carbon black SUPER-P, 2～5 parts water-base cement LA-132; Join together in the deionized water again, obtain cathode size through vacuum stirring:
(3) positive/negative plate preparation: the positive pole slurry that will configure applies on the aluminium foil; Process positive plate after the oven dry: the slurry that configures is coated on the aluminium foil; Process negative plate after the oven dry; Back vacuum bakeout 10-15h under 115-128 ℃ temperature is accomplished in negative pole coating, carries out hydrofuge in the bake process and operates;
(4) preparation of battery: with the coated positive and negative plate of step (3), carry out the roll-in compacting, it is folded mutually to interlock through cross cutting, oven dry, positive and negative plate, forms battery;
(5) battery moulding: aluminium, copper nickel plating lug are welded together to form positive and negative lug with positive and negative plate respectively, again through aluminum plastic film encapsulation, baking, fluid injection, bleed seal, change into, wear out, secondary pumping seals, detect and obtain battery.
Beneficial effect: negative pole solvent of the present invention adopts deionized water, and having solved employing anion water level solvent through raw material screening and technology controlling and process simultaneously is a key technology difficult problem that guarantees battery industryization, greatly reduces the cost of manufacture of battery.
Further improvement of the present invention is:
The described positive active material of described step (1) comprises one or more in cobalt acid lithium, ternary material, LiFePO4, the LiMn2O4; Anodal conductive agent is the mix products of VGCF and carbon black SUPER-P, and anodal binding agent is PVDF commonly used.
Anodal dry powder and NMP mass ratio are 6: 4 described in the described step (1).
The mass ratio of negative pole dry powder and deionized water is 3: 7 described in the described step (2).This all is the charge ratio of comparative optimization, can be convenient to mix, and also practices thrift dry time and energy consumption simultaneously.
Operations such as described roll-in, lamination, battery moulding, aluminum plastic film encapsulation require humidity to be controlled at below 10%, and temperature is controlled at 20 ± 5 ℃.Further avoid residue moisture and oxidized in the battery manufacturing process.
The negative pole excess coefficient of said battery: negative pole design capacity/anodal design capacity is set between 1.2～1.3.
With vacuum bakeout 12h under 120 ℃ the temperature, every separated 1h changed nitrogen one time in the bake process after the negative pole coating was accomplished in the described step (3).The optimal way of hydrofuge operation just also can be modes such as other inert gas replacement of employing when hydrofuge is operated certainly, perhaps adopts the strong solid of moisture absorption ability to put into baking oven etc.
The aging technique of described step (5) is characterised in that, after changing into by common process, makes battery high temperature ageing 72h under 70～80 ℃ of conditions, after aging at normal temperatures 7 days.
The density of the coating described in the described step (4) after the positive plate roll-in compacting is 2.0g/cm
3The density of institute's coating is 1.9g/cm after the said negative plate roll-in compacting
3Carry out compressing tablet after the coating, make it reach certain density, help the performance of battery capacity and the lifting of battery performance.
The nonaqueous electrolyte that injects in the described step (5) comprises wherein one or more of organic solvent ethene carbonic ether (EC), propylene carbonate (PC), carbonic acid diethyl ester (DEC), dimethyl carbonate (DMC), methyl ethyl carbonate (EMC) fat; Electrolyte lithium salt is LiPF
6
Adding mass content in the above-mentioned nonaqueous electrolyte is the additive of this nonaqueous electrolyte 0.2～10%, and this additive is VC, MgO, BaO, Al
2O
3In one or more.
This additive has effectively been eliminated the interior constant power and water of battery and has been separated the destruction of the acid of liquid reaction generation to cycle performance of battery, has solved the ballooning of battery in cyclic process.
Specifically be exactly: there is trace water in inside battery, trace water meeting and LiPF
6Reacting generates HF gas and nonconducting LiF, and the existence of HF can destroy the SEI film again and make inner pressure of battery increase, in addition trace water also can and Li
+Reduction reaction takes place, and generates LiOH and H
2, make inner pressure of battery raise VC, MgO, BaO, Al
2O
3Adding, VC can and H
2Reduction reaction takes place can effectively be suppressed owing to H
2The inner pressure of battery that causes raises, MgO, BaO, Al
2O
3Can react with HF, thereby reduce the destruction of HF the SEI film.Solved the key technology point that adopts water to make solvent as cathode size.
Therefore, the distinctive process control that the present invention adopts, the selection of specified raw material, adopt distinctive aging technique, thoroughly solved the ballooning two big technical barriers in the high and cyclic process of the cost of lithium ion battery.The lithium titanate lithium ion battery cycle performance that adopts this technology to make can reach more than 20000 times.Realized that lithium ion battery is low-cost, high performance technical goal.
Description of drawings
Fig. 1 is the discharge curve comparison diagram of the prior art battery of battery of the present invention and equal design parameter.
Embodiment
Through several groups of preferred embodiments below describing in detail, better show technical scheme of the present invention and technique effect.
Embodiment 1
(1) preparation of anode sizing agent: the dry powder with anode sizing agent is total weight; Join the cobalt acid lithium of getting 92 parts, 3 parts VGCF and carbon black SUPER-P by 1: 1 mixture, 3 parts PVDF (Kynoar-hexafluoropropylene); Mixture, PVDF with cobalt acid lithium, VGCF and carbon black SUPER-P stirs with the three-dimensional hybrid mixer earlier; Join in the nmp solvent together again and obtain anode sizing agent, the mass ratio of dry powder and solvent 1: 1 through vacuum stirring;
(2) preparation of cathode size: the dry powder with cathode size is total weight; Join the lithium titanate of getting 93.5 parts (model: TLB), 4 parts VGCF and carbon black SUPER-P be by 1: 1 mixture, 2.5 parts LA-132 water-base cement; Join together in the deionized water, wherein solid content is 35% to obtain cathode size through vacuum stirring again;
(3) positive/negative plate preparation: the positive pole slurry that will configure is coated on the aluminium foil of 20um, processes positive plate after the oven dry; The slurry that configures is coated on the aluminium foil of 20um, processes negative plate after the oven dry, with the temperature vacuum bakeout 12h of 120 degree, every separated 1h changed nitrogen one time in the bake process after the negative pole coating was accomplished.
(4) preparation of battery: with the coated positive and negative plate of step (3), carry out the roll-in compacting, it is folded mutually to interlock through cross cutting, oven dry, positive and negative plate, forms battery;
(5) battery moulding: aluminium, copper nickel plating lug are welded together to form positive and negative lug with positive and negative plate respectively, again through aluminum plastic film encapsulation, baking, fluid injection, bleed seal, change into, wear out, secondary pumping seals, detect and obtain battery; Aging specifically is battery high temperature ageing 72h under 75 ℃ of conditions, after aging 7 days at normal temperatures.
Operations such as (6) roll-in, lamination, battery moulding, aluminum plastic film encapsulation require humidity to be controlled at below 10%, and temperature is controlled at 20 ± 3 ℃.
Negative pole excess coefficient in the making: negative pole design capacity/anodal design capacity is set in 1.3.
The nonaqueous electrolyte that fluid injection is injected in the step (5) comprises organic solvent ethene carbonic ether (EC), carbonic acid diethyl ester (DEC), methyl ethyl carbonate (EMC) fat, and its volume ratio is 5: 4: 3, and electrolyte lithium salt is LiPPF
6
Adding mass content in the above-mentioned nonaqueous electrolyte is the additive of this nonaqueous electrolyte 0.3%, and this additive is VC, MgO, and its weight ratio is 5: 1.This additive has effectively been eliminated the interior constant power and water of battery and has been separated the destruction of the acid of liquid reaction generation to cycle performance of battery, has solved the ballooning of battery in cyclic process.
Embodiment 2
(1) preparation of anode sizing agent: the dry powder with anode sizing agent is total weight; Join the cobalt acid lithium of getting 92 parts, 3 parts VGCF and carbon black SUPER-P by 1: 1 mixture, 3 parts PVDF; Mixture, PVDF with cobalt acid lithium, VGCF and carbon black SUPER-P stirs with the three-dimensional hybrid mixer earlier; Join in the nmp solvent together again and obtain anode sizing agent, the weight ratio of dry powder and solvent 1: 1 through vacuum stirring;
(2) preparation of cathode size: the dry powder with cathode size is total weight; 7), 3.0 parts LA-132 water-base cement join the lithium titanate of getting 95.0 parts, 2 parts the mixture (VGCF: carbon black SUPER-P=3: of VGCF and carbon black SUPER-P; Join together in the deionized water, wherein solid content is 30% to obtain cathode size through vacuum stirring again;
(3) positive/negative plate preparation: the positive pole slurry that will configure is coated on the aluminium foil of 25um, processes positive plate after the oven dry; The slurry that configures is coated on the aluminium foil of 25um, processes negative plate after the oven dry, with the temperature vacuum bakeout 15h of 128 degree, every separated 1.2h changed nitrogen one time in the bake process after the negative pole coating was accomplished.
(4) preparation of battery: with the coated positive and negative plate of step (3), carry out the roll-in compacting, it is folded mutually to interlock through cross cutting, oven dry, positive and negative plate, forms battery;
(5) battery moulding: aluminium, copper nickel plating lug are welded together to form positive and negative lug with positive and negative plate respectively, again through aluminum plastic film encapsulation, baking, fluid injection, bleed seal, change into, wear out, secondary pumping seals, detect and obtain battery; Aging specifically is battery high temperature ageing 72h under 72 ± 2 ℃ of conditions, after aging 7 days at normal temperatures.
Operations such as (6) roll-in, lamination, battery moulding, aluminum plastic film encapsulation require humidity to be controlled at below 10%, and temperature is controlled at 20 ± 5 ℃.
Negative pole excess coefficient in the making: negative pole design capacity/anodal design capacity is set in 1.2.
The nonaqueous electrolyte that fluid injection is injected in the step (5) comprises organic solvent ethene carbonic ether (EC), carbonic acid diethyl ester (DEC), methyl ethyl carbonate (EMC) fat, and its volume ratio is 1: 1: 1, and electrolyte lithium salt is LiPF
6
Adding mass content in the above-mentioned nonaqueous electrolyte is the additive of this nonaqueous electrolyte 0.5%, and this additive is VC, MgO, BaO, and its weight ratio is 4: 2: 2.
Embodiment 3
(1) preparation of anode sizing agent: the dry powder with anode sizing agent is total weight; 9), 5 parts PVDF join the LiFePO4 of getting 85 parts, 10 parts the mix products (VGCF: carbon black SUPER-P=1: of VGCF and carbon black SUPER-P; Earlier the three is stirred with the three-dimensional hybrid mixer; Join in the nmp solvent together again and obtain anode sizing agent, the weight ratio of dry powder and solvent 6: 4 through vacuum stirring;
(2) preparation of cathode size: the dry powder with cathode size is total weight; 9), 4 parts LA-132 water-base cement join the lithium titanate of getting 90.0 parts, 6 parts the mix products (VGCF: carbon black SUPER-P=1: of VGCF and carbon black SUPER-P; Join together in the deionized water, wherein solid content is 30% to obtain cathode size through vacuum stirring;
(3) positive/negative plate preparation: the positive pole slurry that will configure is coated on the aluminium foil of 25um, processes positive plate after the oven dry; The slurry that configures is coated on the aluminium foil of 25um, processes negative plate after the oven dry, with the temperature vacuum bakeout 12h of 120 degree, every separated 1h changed nitrogen one time in the bake process after the negative pole coating was accomplished.
(4) preparation of battery: with the coated positive and negative plate of step (3), carry out the roll-in compacting, it is folded mutually to interlock through cross cutting, oven dry, positive and negative plate, forms battery;
(5) battery moulding: aluminium, copper nickel plating lug are welded together to form positive and negative lug with positive and negative plate respectively, again through aluminum plastic film encapsulation, baking, fluid injection, bleed seal, change into, wear out, secondary pumping seals, detect and obtain battery; Aging comprising: battery is high temperature ageing 72h under 70-80 ℃ of condition, after aging 7 days at normal temperatures.
Operations such as (6) roll-in, lamination, battery moulding, aluminum plastic film encapsulation require humidity to be controlled at below 10%, and temperature is controlled at 20 ± 5 ℃.
Negative pole excess coefficient in the making: negative pole design capacity/anodal design capacity is set in 1.2.
The nonaqueous electrolyte that fluid injection is injected in the step (5) comprises organic solvent ethene carbonic ether (EC), carbonic acid diethyl ester (DEC), methyl ethyl carbonate (EMC) fat, and its volume ratio is 3: 2: 2, and electrolyte lithium salt is LiPF
6
Adding mass content in the above-mentioned nonaqueous electrolyte is the additive of this nonaqueous electrolyte 0.9%, and this additive is VC, BaO, Al
2O
3, its weight ratio is 3: 2: 3; This additive has effectively been eliminated the interior constant power and water of battery and has been separated the destruction of the acid of liquid reaction generation to cycle performance of battery, has solved the ballooning of battery in cyclic process.
Comparative Examples 1
(1) preparation of anode sizing agent: positive active material adopts LiFePO4; Dry powder with anode sizing agent is total weight; Join the positive active material of getting 90 parts, 5 parts anodal conductive agent, 5 parts anodal binding agent; Earlier adopt the three-dimensional hybrid mixer to stir positive active material and anodal conductive agent, anodal binding agent dry powder, join in the nmp solvent together and obtain anode sizing agent through vacuum stirring, dry powder and weight of solvent were than 6: 4; Wherein anodal conductive agent is that carbon black SUPER-P, anodal binding agent are PVDF (Kynoar-hexafluoropropylene) commonly used.
(2) preparation of cathode size: the dry powder with cathode size is total weight; Join the negative electrode active material of getting 90.0 parts, 6 parts cathode conductive agent, 4 parts negative pole aqueous binders; Join together in the deionized water, wherein solid content is 25.0% to obtain cathode size through vacuum stirring again; Wherein negative electrode active material is that lithium titanate, cathode conductive agent are that carbon black SUPER-P, negative pole binding agent are the LA-132 water-base cement.
(3) positive/negative plate is made: the positive pole slurry that will configure is coated on the aluminium foil of 25um, processes positive plate after the oven dry; The slurry that configures is coated on the aluminium foil of 25um, processes negative plate after the oven dry, with the temperature vacuum bakeout 12h of 120 degree, every separated 1h changed nitrogen one time in the bake process after the negative pole coating was accomplished.
(4) preparation of battery: with the coated positive and negative plate of step (3), carry out the roll-in compacting, it is folded mutually to interlock through cross cutting, oven dry, positive and negative plate, forms battery;
(5) battery moulding: aluminium, copper nickel plating lug are welded together to form positive and negative lug with positive and negative plate respectively, again through aluminum plastic film encapsulation, baking, fluid injection, bleed seal, change into, wear out, secondary pumping seals, detect and obtain battery.
Operations such as (6) roll-in, lamination, battery moulding, aluminum plastic film encapsulation require humidity to be controlled at below 10%, and temperature is controlled at 20 ± 5 ℃.
Negative pole excess coefficient in the making: negative pole design capacity/anodal design capacity is set in 1.2.
The nonaqueous electrolyte that fluid injection is injected in the step (5) comprises organic solvent ethene carbonic ether (EC), carbonic acid diethyl ester (DEC), methyl ethyl carbonate (EMC) fat, and its volume ratio is 1: 1: 1, and electrolyte lithium salt is LiPF
6
The power lithium-ion battery that above-mentioned comparative example 1, embodiment 1, embodiment 2, embodiment 3, Comparative Examples 1 are made carries out following contrast test respectively, and experimental data is seen shown in the table 1:
Table 1
| Comparative Examples 1 | Implement 1 | Implement 2 | Implement 3 | |
| 1 all capability retentions (%) | 100 | 100 | 100 | 100 |
| 1000 all capability retentions (%) | 88.3 | 99.2 | 98.3 | 99.5 |
| 5000 all capability retentions (%) | 69.2 | 95.2 | 94.3 | 96.0 |
| 10000 all capability retentions (%) | / | 90.2 | 88.4 | 92.1 |
| 20000 all capability retentions (%) | / | 80.3 | 78.5 | 82.3 |
| Cyclic process has or not aerogenesis | Aerogenesis | Do not have | Do not have | Do not have |
Can find out embodiment 1,2 anodal identical and be different from the positive pole of embodiment 3, but battery performance no significant difference by above-mentioned data; From embodiment and Comparative Examples data can find out, use the technology of the present invention can be with deionization water level negative pole solvent, the lithium ion battery that obtained performance is good; But only the battery of additive could guarantee no ballooning in nonaqueous electrolyte, guarantees the discharge performance and the useful life of battery.
The battery of embodiments of the invention 3 and equivalent technology specification and parameter, lithium titanate is as shown in Figure 1 as the contrast of the discharge curve of the battery of the prior art of negative active core-shell material.
Both discharge key data contrasts are as shown in table 2:
Table 2
| Discharging current (mA) | Termination capacity (mAh) | Average internal resistance (m Ω) | Middle threshold voltage (V) |
| 1400 | 1619.423 | 40.9 | 2.353 |
| 1400 | 2880.3 | 20.2 | 2.444 |
Can find out by above discharge curve, aerogenesis in the too sour lithium ion battery discharge process that the employing prior art is made, the guiding discharge curve abnormality, discharge platform is low, and capacity is low; And discharge capacity of lithium ion battery, platform, the internal resistance of adopting the inventive method to make are all normal.
Claims (10)
1. the manufacture method of the negative plate of a lithium titanate lithium ion battery, step comprises:
(1) preparation of cathode size: the dry powder with cathode size is total weight; Join the lithium titanate of getting 90～95 parts, 3～6 parts VGCF and the mix products of carbon black SUPER-P, 2～5 parts water-base cement LA-132; Join together in the deionized water again, obtain cathode size through vacuum stirring;
(2) negative plate preparation: the slurry that configures is coated on the aluminium foil, processes negative plate after the oven dry, with vacuum bakeout 10-15h under 115-128 ℃ the temperature, carry out the hydrofuge operation in the bake process after the negative pole coating is accomplished.
2. the manufacture method of a lithium titanate lithium ion battery, step comprises:
(1) preparation of anode sizing agent: the dry powder with anode sizing agent is total weight; Join the positive active material of getting 75～95 parts, 2～5 parts anodal conductive agent, 2～5 parts anodal binding agent; Adopt the three-dimensional hybrid mixer to stir positive active material and anodal conductive agent, anodal binding agent dry powder earlier, join in the nmp solvent together again and obtain anode sizing agent through vacuum stirring;
(2) preparation of cathode size: the dry powder with cathode size is total weight; Join the lithium titanate of getting 90～95 parts, 3～6 parts VGCF and the mix products of carbon black SUPER-P, 2～5 parts water-base cement LA-132; Join together in the deionized water again, obtain cathode size through vacuum stirring;
(3) positive/negative plate preparation: the positive pole slurry that will configure applies on the aluminium foil, processes positive plate after the oven dry; The slurry that configures is coated on the aluminium foil, processes negative plate after the oven dry, back vacuum bakeout 10-15h under 115-128 ℃ temperature is accomplished in negative pole coating, carries out hydrofuge in the bake process and operates;
(4) preparation of battery: with the coated positive and negative plate of step (3), carry out the roll-in compacting, it is folded mutually to interlock through cross cutting, oven dry, positive and negative plate, forms battery;
(5) battery moulding: aluminium, copper nickel plating lug are welded together to form positive and negative lug with positive and negative plate respectively, again through aluminum plastic film encapsulation, baking, fluid injection, bleed seal, change into, wear out, secondary pumping seals, detect and obtain battery.
3. manufacture method according to claim 2 is characterized in that: the positive active material that uses in the described step (1) comprises one or more in cobalt acid lithium, ternary material, LiFePO4, the LiMn2O4; Anodal conductive agent is the mix products of VGCF and carbon black SUPER-P, and anodal binding agent is PVDF.
4. manufacture method according to claim 2 is characterized in that: anodal dry powder described in the described step (1) and NMP mass ratio are 6: 4.
5. manufacture method according to claim 2 is characterized in that: the mass ratio of negative pole dry powder and deionized water is 3: 7 described in the described step (2).
6. manufacture method according to claim 2 is characterized in that: operations such as described roll-in, lamination, battery moulding, aluminum plastic film encapsulation require humidity to be controlled at below 10%, and temperature is controlled at 20 ± 5 ℃.
7. manufacture method according to claim 2 is characterized in that: the negative pole excess coefficient of said battery: negative pole design capacity/anodal design capacity is set between 1.2～1.3;
The density of the coating described in the described step (4) after the positive plate roll-in compacting is 2.0g/cm
3The density of institute's coating is 1.9g/cm after the said negative plate roll-in compacting
3
8. manufacture method according to claim 2 is characterized in that: back vacuum bakeout 12h under 120 ℃ temperature is accomplished in the negative pole coating in the described step (3), and every separated 1h changes nitrogen one time in the bake process.
9. manufacture method according to claim 2 is characterized in that: the aging technique of described step (5) is that battery is high temperature ageing 72h under 70～80 ℃ of conditions after changing into by common process, after aging at normal temperatures 7 days.
10. manufacture method according to claim 2; It is characterized in that: the nonaqueous electrolyte that injects in the described step (5) comprises wherein one or more of organic solvent ethene carbonic ether (EC), propylene carbonate (PC), carbonic acid diethyl ester (DEC), dimethyl carbonate (DMC), methyl ethyl carbonate (EMC) fat, and electrolyte lithium salt is LiPF
6
Adding mass content in the nonaqueous electrolyte is the additive of this nonaqueous electrolyte 0.2～10%, and this additive is VC, MgO, BaO, Al
2O
3In one or more.
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| CN105098252A (en) * | 2014-05-06 | 2015-11-25 | 深圳市沃特玛电池有限公司 | Method for manufacturing high-rate and high-temperature lithium titanate polymer lithium ion battery |
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| CN106328926B (en) * | 2016-10-18 | 2020-03-27 | 湖南锂顺能源科技有限公司 | High-safety long-life ternary material battery |
| CN106328926A (en) * | 2016-10-18 | 2017-01-11 | 湖南锂顺能源科技有限公司 | High-security long-life ternary material battery |
| CN106981685A (en) * | 2016-12-11 | 2017-07-25 | 长兴天晟能源科技有限公司 | A kind of lithium ion cell electrode piece baking process containing aqueous binders |
| CN108417921A (en) * | 2018-02-09 | 2018-08-17 | 浙江衡远新能源科技有限公司 | A kind of preparation method and battery of high energy density cells |
| CN108511788A (en) * | 2018-03-29 | 2018-09-07 | 东莞市智盈新能源有限公司 | A kind of high magnification ternary system start and stop lithium ion battery and preparation method thereof |
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| CN109378412A (en) * | 2018-10-22 | 2019-02-22 | 北京环宇东方聚能科技有限公司 | A kind of polymer Li-ion battery and its manufacturing method |
| CN110364720A (en) * | 2019-07-26 | 2019-10-22 | 南京海泰纳米材料有限公司 | Positive electrode active materials and preparation method thereof, anode pole piece and preparation method based on positive electrode active materials preparation |
| CN110364720B (en) * | 2019-07-26 | 2021-02-05 | 南京海泰纳米材料有限公司 | Positive active material, positive pole piece and preparation method thereof |
| CN110620211A (en) * | 2019-08-01 | 2019-12-27 | 东莞市易利特新能源有限公司 | High-energy-density lithium ion battery and preparation method thereof |
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