CN104167534B - A kind of method preparing cylinder 18650 lithium ion battery - Google Patents
A kind of method preparing cylinder 18650 lithium ion battery Download PDFInfo
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- CN104167534B CN104167534B CN201410383412.8A CN201410383412A CN104167534B CN 104167534 B CN104167534 B CN 104167534B CN 201410383412 A CN201410383412 A CN 201410383412A CN 104167534 B CN104167534 B CN 104167534B
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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 invention discloses a kind of method preparing cylinder 18650 lithium ion battery, battery core positive electrode is made up of following raw material by mass percentage: nickel cobalt lithium aluminate 95.5-98.8%, electrically conductive graphite 0-0.5%, conductive agent 0.5-2%, Kynoar 0.7-2.0%；Battery core negative material is made up of following raw material by mass percentage: graphite 94.5-97.5%, conductive carbon black 0-1.0%, sodium carboxymethyl cellulose 1-2%, butadiene-styrene rubber 1.5-2.5%.The preparation method of cylinder 18650 lithium ion battery that the present invention provides, there is low cost, capacity height 2800mAh, the feature of cycle performance superior (200 weeks conservation rates more than 80% of 0.5/0.5C), and the method there is the feature that efficiency is high and energy consumption is low that solvent usage amount is few, be coated with.
Description
Technical field
The invention belongs to technical field of lithium ion, relate to a kind of cylinder 18650 lithium-ion electric
The preparation method in pond.
Background technology
At present, the positive electrode of 18650-2800mAh model capacity battery core mostly uses gram volume
165mAh/g (voltage bound 4.35-2.75V), compactness 4.2g/cm3Cobalt acid lithium series
Lithium-ion electric core, because the granule-morphology of cobalt acid lithium material and molecular structure property determine its
Gram volume and compactness, existing material, in 18650 models of regulation, passes through lithium cobaltate cathode
Compacting and the allotment of gram volume can produce the cylindrical electrical core of 2800mAh capacity；And in order to
Reducing cost, part producer, in cobalt acid lithium, adds gram volume 175mAh/g, and (voltage is upper and lower
Limit 4.35-2.75V), compactness is 3.9g/cm3Ternary material can also manufacture 2800mAh
The cylindrical electrical core of capacity；But being because the restriction in model space, existing positive electrode can only be to make
With pure cobalt acid lithium or mixing ternary manufacture.And use cobalt acid lithium or cobalt acid lithium to add ternary material and make
Battery core for positive electrode has a disadvantage in that cost height, capacity low (2750mAh)),
Cycle performance poor (100 weeks conservation rates more than 80% of 0.5/0.5C).
Summary of the invention
For the deficiencies in the prior art, an object of the present invention aims to provide a kind of cylinder
18650 lithium ion batteries, it has low cost, capacity high (2800mAh), cycle performance
The feature of superior (200 weeks conservation rates more than 80% of 0.5/0.5C).
The two of the purpose of the present invention aim to provide the preparation of a kind of cylinder 18650 lithium ion battery
Method, the method has the feature that efficiency is high and energy consumption is low that solvent usage amount is few, be coated with.
Realize the purpose of the present invention to reach by adopting the following technical scheme that:
A kind of method preparing cylinder 18650 lithium ion battery, the positive electrode of battery core be by by
The following raw material composition of mass percent: nickel cobalt lithium aluminate 95.5-98.8%, electrically conductive graphite
0-0.5%, does not include other conductive agent 0.5-2% of electrically conductive graphite, Kynoar
0.7-2.0%, it is characterised in that sequentially include the following steps:
1) weigh raw material according to the formulation ratio of positive electrode and negative material, pass through double-planet
Positive electrode, negative material are fabricated to anode sizing agent and cathode size by beater respectively；Wherein,
Technological parameter: revolution 50Rpm, rotation 1700Rpm, time 3H；
2) use gap coating machine, anode sizing agent is coated on aluminium foil and makes water content < 0.12%
Positive plate, cathode size is coated on Copper Foil and makes water content < 0.4% negative plate；Wherein,
Technological parameter: temperature is set in 100-115 DEG C, speed 7-10 rice/min；
3) in humidity, < 60%RH, first by both positive and negative polarity pole piece difference in the environment of temperature 25 ± 5 DEG C
After cutting and be welded into positive pole ear, negative lug, then with up-coiler by barrier film, anode pole piece,
Cathode pole piece is wound into core, after outward appearance and short-circuit detecting are qualified, by upper insulating trip, volume
After core, lower insulating trip stacking, be placed into a diameter of 18 ± 0.4mm, height is 68 ± 0.5mm
Box hat, by inversion bonding machine, negative lug is weldingly connected with box hat, after slot rolling,
Enter baking oven, under conditions of 85 ± 10 DEG C, toast 30 ± 10H, more entirely examine short circuit, qualified products
Proceed to humidity < 2%RH, temperature 25 ± 5 DEG C glove box in, inject 5.3 ± 0.5g electrolyte,
By on Laser Welding welding positive pole ear to block, then buckle well block and send into full envelope to box hat
It is machined to 18650 standard battery cell of diameter 18mm, highly 65mm；
4) after 18650 standard battery cell being cleaned painting antirust oil, then 18650 standard battery cell are existed
In the environment of temperature 25-45 DEG C after aging 36H, on be melted on formation cabinet, after terminating,
By battery core first in the environment of temperature 40 ± 5 DEG C aging three days, then temperature 25 ± 5 DEG C
Under environment aging four days, ageing process is wrapped PET, is then become by matching machine screening battery core
Different voltage internal resistance class, by qualified battery core partial volume, finally by capacity > 2820mAh, FQC
Outward appearance entirely examine qualified after battery core, prepare according to capacity 10mAh, voltage 3mV, internal resistance 2m Ω
Group, OQC examines qualified rear shipment entirely.
The formulation Design Principle of positive electrode:
1, during the effect of nickel cobalt lithium aluminate is battery core charge and discharge process, the composition of lithium ion is produced,
Embody the material of battery core capacity；Regulation is to reserve enough ratios in 95.5-98.8% scope
Example is to conductive agent and binding agent, and less than 95.5, battery core capacity is difficult to design and reaches 2800, greatly
Big in the 98.8 easy sheddings of battery core pole piece or battery core internal resistance.
2, the effect of electrically conductive graphite be pole piece to roller during, soften pole piece.Regulation is at 0-0.5%
Scope, is to effectively pole piece toughness be improved with it more than 0, but more than 0.5 impact
The design of battery core capacity, and battery core pole piece toughness also will not increase with its dosage and change.
3, the effect of conductive agent is to play conduction electronic action in pole piece.Regulation is at 0.5-2.0%
Scope, setting value reduces the internal resistance of pole piece more than 0.5 for sufficient conductive agent, gives full play to
Active matter gram volume, is to reserve more space to active matter less than 2, and increases dosage also
It is helpless to active matter gram volume play.
4, Kynoar effect is binding agent, is attached on by positive electrode on long-pending fluid aluminium foil
Face.Specifying in 0.7-2.0% scope, design load is the binding agent in order to there be abundance more than 0.7
Material above is sticked to above aluminium foil, it is ensured that processing characteristics and the material capacity of pole piece are sent out
Wave, less than 2 in order to reserve more space to active matter, and increase dosage and be also helpless to active matter
Gram volume plays, and also can increase battery core internal resistance, affect battery core volumetric properties.
Preferably, its negative material is made up of following raw material by mass percentage: graphite
94.5-97.5%, conductive carbon black 0-1.0%, sodium carboxymethyl cellulose 1-2%, butadiene-styrene rubber
1.5-2.5%.
Preferably, in step 1) positive electrode formula in independent add that to account for positive electrode total
The oxalic acid of the 0.1-1% of amount.The alkalescence of ternary can be neutralized, reduce slurry water suction, strengthen slurry
The mobility of material, promotes the stability of coating, ensures the Capacity uniformity of battery core, grass after coating
Acid decomposes, does not affect material prescription ratio and the combination property of battery core.
Preferably, step 4) in, the technological parameter of chemical conversion is as follows: upper voltage limit: 4350mV,
Constant current: 140mA, time: 120min；Upper voltage limit: 4350mV, constant current constant voltage: 560mA,
Time: 420min, terminates electric current: 28mA.
Preferably, step 4) in, also include that the processing procedure singly filled is as follows:
The first step: constant-current constant-voltage charging, technological parameter is: upper voltage limit 4350mV, electric current
1700mA, time 300min, terminate electric current 28mA；
Second step: shelve, technological parameter is: time 5min；
3rd step: constant-current discharge, technological parameter is: lower voltage limit 2750mV, discharge current
1400mA, time 150min；
4th step: shelve, technological parameter is: time 5min；
5th step: constant-current charge, technological parameter is: upper voltage limit 4350mV, electric current 1400mA,
Time 40min
6th step: constant-current charge, technological parameter is: upper voltage limit 4350mV, electric current 560mA,
Time 20min.
Preferably, step 3) in, described block be 17.5*3.9mm containing PTC and CID
Block.
The beneficial effects of the present invention is:
1, the present invention is reformed by formula and ternary improved properties is (by promoting nickel cobalt lithium aluminate
Gram volume is to 192mAh/g (voltage bound 4.35-2.75V), compactness to 3.6g/cm3)。
Existing cobalt acid lithium or cobalt acid lithium are added the high cost of ternary, capacity low (2750mAh), circulation
The positive pole system of poor performance (100 weeks conservation rates more than 80% of 0.5/0.5C), replaces with completely
Pure ternary (nickel cobalt lithium aluminate) low cost, capacity high (2800mAh), cycle performance are superior
The positive pole system of (200 weeks conservation rates more than 80% of 0.5/0.5C), negative pole graphite (active matter
Main material) content is substantially improved 95.5% by original 93.8%, and so can be in 18650 models
Load more active component in the space that battery core is quantitative and make the battery core of more capacity, and battery core
Performance meet national requirements.Therefore, the present invention is by 18650-2800mAh model capacity lithium
The capacity of ion battery battery core is risen to by existing 0.2/0.2C dischargeable capacity 2750mAh
More than 2800mAh, cycle performance superior (200 weeks conservation rates more than 80% of 0.5/0.5C).
Because the unit price of nickel cobalt aluminum is: 180,000 yuan/ton, gram volume is: 192mAh/g；Cobalt acid
Lithium unit price is: 18.5 ten thousand yuan/ton, and gram volume is: 165mAh/g；According to the 2800mAh set,
Polynary cost is 2.62 yuan/PCS, and cobalt acid lithium cost is: 3.14 yuan/PCS.Every price is raw
Produce cost and reduce by more than 0.5 yuan.
2, in the preparation method of the present invention, the solvent usage amount of dispensing, by original 33%, reduces
To 30%, (slurry solvent content reduces the improved efficiency 3% of coating, and during coating, pole piece is easily done
Dry), coating temperature, by original average 120 DEG C, is reduced to present 115 DEG C, and energy consumption drops
Low by 4%.In step 1 in the preparation method of the present invention) positive electrode formula in independent add
Account for the oxalic acid of the 0.1-1% of positive electrode total amount, the alkalescence of ternary can be neutralized, reduce slurry
Water suction, the mobility of enhancing slurry, promote the stability of coating, ensures that the capacity of battery core is consistent
Property, oxalic acid decomposes after coating, do not affect material prescription ratio and the combination property of battery core.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is illustrated
Embodiment 1:
A kind of method preparing cylinder 18650 lithium ion battery, including be made up of positive electrode
Positive plate and the negative plate being made up of negative material.
Its positive electrode is made up of following raw material by mass percentage: nickel cobalt lithium aluminate
96.8%, electrically conductive graphite 0.30%, conductive agent 1.40%, Kynoar (PVDF) 1.50%.
Its negative material is made up of following raw material by mass percentage: graphite
95.5%, SP (conductive carbon black) 1.0%, CMC (sodium carboxymethyl cellulose) 1.5%, SBR (fourth
Benzene rubber) 2.0%.
Described conductive agent is CNT (CNT), CNC (carbon nano tube compound material) or
SP (conductive carbon black).Described electrically conductive graphite is KS-6 (crystalline flake graphite).
Prepare specifically comprising the following steps that of cylinder 18650 lithium ion battery
1) raw material is weighed according to the formulation ratio of above-mentioned positive electrode and negative material, by double
Positive electrode, negative material are fabricated to anode sizing agent and cathode size by planet beater respectively；
Wherein, technological parameter: revolution 50Rpm, rotation 1700Rpm, time 3H；
2) use gap coating machine, anode sizing agent is coated on aluminium foil and makes water content < 0.12%
Positive plate, cathode size is coated on Copper Foil and makes water content < 0.4% negative plate；Wherein,
Technological parameter: temperature is set in 100-115 DEG C, speed 7-10 rice/min；
3) in humidity, < 60%RH, first by both positive and negative polarity pole piece difference in the environment of temperature 25 ± 5 DEG C
After cutting and be welded into positive pole ear, negative lug, (the most extremely aluminium strip, negative pole is nickel strap or plating
Nickel steel band), then with up-coiler, barrier film, anode pole piece, cathode pole piece are wound into core, will
After outward appearance and short-circuit detecting are qualified, after upper insulating trip, core, lower insulating trip stacking,
It is placed into the box hat of a diameter of 18 ± 0.4mm, highly 68 ± 0.5mm, by inversion bonding machine
Negative lug is weldingly connected with box hat, after slot rolling, enters baking oven, at 85 ± 10 DEG C
Under the conditions of toast 40H, more entirely examine short circuit, qualified products proceed to humidity < 2%RH, temperature 25 ± 5 DEG C
Glove box in, inject 5.3 ± 0.5g electrolyte, by Laser Welding welding positive pole ear to cover
On cap, described block is the block containing PTC and CID of 17.5*3.9mm, then buckles well lid
Cap is machined to 18650 standard electric of diameter 18mm, highly 65mm to the full envelope of feeding on box hat
Core；
4) after 18650 standard battery cell being cleaned painting antirust oil, then 18650 standard battery cell are existed
In the environment of temperature 25-45 DEG C after aging 36H, on be melted on formation cabinet, after terminating,
By battery core first in the environment of temperature 40 ± 5 DEG C aging three days, then temperature 25 ± 5 DEG C
Under environment aging four days, ageing process is wrapped PET, is then become by matching machine screening battery core
Different voltage internal resistance class, by qualified battery core partial volume, finally by capacity > 2820mAh, FQC
Outward appearance entirely examine qualified after battery core, prepare according to capacity 10mAh, voltage 3mV, internal resistance 2m Ω
Group, OQC examines qualified rear shipment entirely.
In step 1) positive electrode formula in independent interpolation account for positive electrode total amount
The oxalic acid of 0.1-0.5%.The alkalescence of ternary can be neutralized, reduce slurry water suction, strengthen slurry
Mobility, promotes the stability of coating, ensures the Capacity uniformity of battery core, and after coating, oxalic acid is subject to
Thermal decomposition, does not affect material prescription ratio and the combination property of battery core.
Step 4) technological parameter of described chemical conversion is as follows: the technological parameter of chemical conversion is as follows: the upper limit
Voltage: 4350mV, constant current: 140mA, time: 120min；Upper voltage limit: 4350mV,
Constant current constant voltage: 560mA, time: 420min, terminate electric current: 28mA.
Step 4) the described processing procedure singly filled is as follows:
The first step: constant-current constant-voltage charging, technological parameter is: upper voltage limit 4350mV, electric current
1700mA, time 300min, terminate electric current 28mA；
Second step: shelve, technological parameter is: time 5min；
3rd step: constant-current discharge, technological parameter is: lower voltage limit 2750mV, discharge current
1400mA, time 150min；
4th step: shelve, technological parameter is: time 5min；
5th step: constant-current charge, technological parameter is: upper voltage limit 4350mV, electric current 1400mA,
Time 40min
6th step: constant-current charge, technological parameter is: upper voltage limit 4350mV, electric current 560mA,
Time 20min.
Preferably, step 3) described block is the lid containing PTC and CID of 17.5*3.9mm
Cap.
Embodiment 2:
The feature of the present embodiment is:
Its positive electrode is made up of following raw material by mass percentage: nickel cobalt lithium aluminate
98.8%, electrically conductive graphite 0%, conductive agent 0.5%, Kynoar (PVDF) 0.7%.
Its negative material is made up of following raw material by mass percentage: graphite
97.5%, SP (conductive carbon black) 0%, CMC (sodium carboxymethyl cellulose) 1%, SBR (butylbenzene rubber
Glue) 1.5%.
Other are same as in Example 1.
Embodiment 3:
The feature of the present embodiment is:
Its positive electrode is made up of following raw material by mass percentage: nickel cobalt lithium aluminate
95.5%, electrically conductive graphite 0.5%, conductive agent 2%, Kynoar (PVDF) 2.0%.
Its negative material is made up of following raw material by mass percentage: graphite
94.5%, SP (conductive carbon black) 1.0%, CMC (sodium carboxymethyl cellulose) 2%, SBR (butylbenzene
Rubber) 2.5%.
Other are same as in Example 1.
Embodiment 4:
The feature of the present embodiment is:
Its positive electrode is made up of following raw material by mass percentage: nickel cobalt lithium aluminate
95.9%, electrically conductive graphite 0.1%, conductive agent 2%, Kynoar (PVDF) 2.0%.
Its negative material is made up of following raw material by mass percentage: graphite
94.9%, SP (conductive carbon black) 0.1%, CMC (sodium carboxymethyl cellulose) 2%, SBR (butylbenzene
Rubber) 2.5%.
Other are same as in Example 1.
Comparative example 1:
The positive electrode of conventional 18650-2800mAh model capacity battery core and negative material
Concrete formula is shown in Table 1.
Table 1 conventional cathode material and the formula table of negative material
By above contrast embodiments of the invention 1 and comparative example 1, prove the present invention clearly
Embodiment 1 formula positive pole ternary (nickel cobalt lithium aluminate) content is substantially improved by original 94%
To 97.4%, reformed by formula and ternary improved properties (gram volume promotes, and compacting strengthens)
Existing cobalt acid lithium or cobalt acid lithium are added the high cost of ternary, capacity low (2750mAh), circulation
The positive pole system of poor performance (100 weeks conservation rates more than 80% of 0.5/0.5C), replaces with completely
Pure ternary (nickel cobalt lithium aluminate) low cost, capacity high (2800mAh), cycle performance are superior
The positive pole system of (200 weeks conservation rates more than 80% of 0.5/0.5C), negative pole graphite (active matter
Main material) content is substantially improved 95.5% by original 93.8%, and so can be in 18650 models
Load more active component in the space that battery core is quantitative and make the battery core of more capacity, and battery core
Performance meet national requirements.
Above-described embodiment is only currently preferred case study on implementation, it is impossible to limit the present invention with this
Scope required for protection, it is any that those skilled in the art is done on the basis of the present invention
Unsubstantiality and replace belong to the scope of protection of present invention.
Claims (6)
1. the method preparing cylinder 18650 lithium ion battery, the positive electrode of battery core be by
Following raw material composition by mass percentage: nickel cobalt lithium aluminate 95.5-98.8%, electrically conductive graphite
0-0.5%, does not include other conductive agent 0.5-2% of electrically conductive graphite, Kynoar
0.7-2.0%, it is characterised in that sequentially include the following steps:
1) weigh raw material according to the formulation ratio of positive electrode and negative material, pass through double-planet
Positive electrode, negative material are fabricated to anode sizing agent and cathode size by beater respectively；Wherein,
Technological parameter: revolution 50Rpm, rotation 1700Rpm, time 3H；
2) use gap coating machine, anode sizing agent is coated on aluminium foil and makes water content < 0.12%
Positive plate, cathode size is coated on Copper Foil and makes water content < 0.4% negative plate；Wherein,
Technological parameter: temperature is set in 100-115 DEG C, speed 7-10 rice/min；
3) in humidity, < 60%RH, first by both positive and negative polarity pole piece difference in the environment of temperature 25 ± 5 DEG C
After cutting and be welded into positive pole ear, negative lug, then with up-coiler by barrier film, anode pole piece,
Cathode pole piece is wound into core, after outward appearance and short-circuit detecting are qualified, by upper insulating trip, volume
After core, lower insulating trip stacking, be placed into a diameter of 18 ± 0.4mm, height is 68 ± 0.5mm
Box hat, by inversion bonding machine, negative lug is weldingly connected with box hat, after slot rolling,
Enter baking oven, under conditions of 85 ± 10 DEG C, toast 30 ± 10H, more entirely examine short circuit, qualified products
Proceed to humidity < 2%RH, temperature 25 ± 5 DEG C glove box in, inject 5.3 ± 0.5g electrolyte,
By on Laser Welding welding positive pole ear to block, then buckle well block and send into full envelope to box hat
It is machined to 18650 standard battery cell of diameter 18mm, highly 65mm；
4) after 18650 standard battery cell being cleaned painting antirust oil, then 18650 standard battery cell are existed
In the environment of temperature 25-45 DEG C after aging 36H, on be melted on formation cabinet, after terminating,
By battery core first in the environment of temperature 40 ± 5 DEG C aging three days, then temperature 25 ± 5 DEG C
Under environment aging four days, ageing process is wrapped PET, is then become by matching machine screening battery core
Different voltage internal resistance class, by qualified battery core partial volume, finally by capacity > 2820mAh, FQC
Outward appearance entirely examine qualified after battery core, prepare according to capacity 10mAh, voltage 3mV, internal resistance 2m Ω
Group, OQC examines qualified rear shipment entirely.
The method preparing cylinder 18650 lithium ion battery the most according to claim 1, its
It is characterised by: its negative material is made up of following raw material by mass percentage: graphite
94.5-97.5%, conductive carbon black 0-1.0%, sodium carboxymethyl cellulose 1-2%, butadiene-styrene rubber
1.5-2.5%.
The method preparing cylinder 18650 lithium ion battery the most according to claim 1, its
Be characterised by: in step 1) positive electrode formula in independent interpolation account for positive electrode total amount
The oxalic acid of 0.1-1%.
The method preparing cylinder 18650 lithium ion battery the most according to claim 1, its
It is characterised by: step 4) in, the technological parameter of chemical conversion is as follows: upper voltage limit: 4350mV,
Constant current: 140mA, time: 120min；Upper voltage limit: 4350mV, constant current constant voltage: 560mA,
Time: 420min, terminates electric current: 28mA.
The method preparing cylinder 18650 lithium ion battery the most according to claim 1, its
It is characterised by: step 4) in, also include that the processing procedure singly filled is as follows:
The first step: constant-current constant-voltage charging, technological parameter is: upper voltage limit 4350mV, electric current
1700mA, time 300min, terminate electric current 28mA；
Second step: shelve, technological parameter is: time 5min；
3rd step: constant-current discharge, technological parameter is: lower voltage limit 2750mV, discharge current
1400mA, time 150min；
4th step: shelve, technological parameter is: time 5min；
5th step: constant-current charge, technological parameter is: upper voltage limit 4350mV, electric current 1400mA,
Time 40min
6th step: constant-current charge, technological parameter is: upper voltage limit 4350mV, electric current 560mA,
Time 20min.
The method preparing cylinder 18650 lithium ion battery the most according to claim 1, its
Be characterised by: step 3) in, described block be 17.5*3.9mm containing PTC's and CID
Block.
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| CN105185986A (en) * | 2015-08-14 | 2015-12-23 | 江苏腾方新能源科技有限公司 | High-capacity cylindrical 18650 lithium-ion battery and preparation method thereof |
| CN105261796A (en) * | 2015-09-23 | 2016-01-20 | 深圳市博力康电池有限公司 | Preparation method of quickly fully-charged cylindrical power lithium-ion battery cell |
| CN105336961A (en) * | 2015-11-30 | 2016-02-17 | 四川北方硝化棉股份有限公司 | Lithium battery anode and preparation method thereof |
| CN106252569B (en) * | 2016-08-31 | 2019-03-01 | 天津市捷威动力工业有限公司 | A kind of high volume energy density extended-life lithium ion battery of high voltage and preparation method thereof |
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