CN110890595A - Preparation method of ultralow-temperature lithium ion battery for electronic cigarette - Google Patents
Preparation method of ultralow-temperature lithium ion battery for electronic cigarette Download PDFInfo
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- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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Abstract
The invention discloses a preparation method of an ultralow-temperature soft-packaged lithium ion battery for electronic cigarettes, which comprises the following specific preparation processes: winding the prepared positive pole piece, negative pole piece and isolating film together by a winding machine to form a winding core, wherein the used PE film with the diaphragm thickness of 20um has the porosity of 48%; and placing the obtained roll core into an aluminum plastic film, injecting electrolyte into the battery cell after baking, and then carrying out formation, secondary sealing and capacity grading on the prepared battery cell to obtain the lithium ion battery. The positive electrode adopts the graphene modified lithium cobaltate material, the graphene can be uniformly dispersed among particles of the lithium cobaltate positive electrode material, and the graphene on the surface of the lithium cobaltate positive electrode plays a role in fixing O atoms on the surface of the material, so that the structure of the material is stabilized, the decomposition of electrolyte on the surface of the lithium cobaltate positive electrode is inhibited, and the cycle performance, especially the low-temperature cycle performance, of the material is improved.
Description
Technical Field
The invention belongs to the field of lithium ion battery preparation, and relates to a preparation method of an ultralow temperature electronic cigarette lithium ion battery.
Background
Since the nineties of the last century, the lithium ion battery has the advantages of high energy density, long cycle life, no memory effect and the like, and is continuously popularized and applied in the fields of 3C digital products, energy storage power stations, new energy vehicles, aerospace and the like, so that the lithium ion battery becomes a storage battery with the widest application prospect at present. However, the lithium ion battery has its own defects, the battery discharge capacity under low temperature conditions is obviously reduced compared with the normal temperature environment, and especially the battery capacity under ultralow temperature (-40 ℃) environment cannot be basically released, because under low temperature environment, the electrolyte tends to condense, the conductivity is reduced, the internal resistance of the battery is increased, lithium ions are difficult to be inserted into the negative electrode during charging, and metal lithium deposition is formed on the surface, so that the battery cannot be used, and in severe cases, potential safety hazards are also formed, so that safety problems such as combustion and explosion are caused.
Disclosure of Invention
The invention aims to provide an ultralow-temperature soft-packaged lithium ion battery for electronic cigarettes and a preparation method thereof, wherein the capacity of the battery manufactured by the method in a-40-DEG environment is more than 90% of the capacity released at 25 ℃ at normal temperature, and the low-temperature performance is particularly excellent.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of an ultralow-temperature flexible-package lithium ion battery for electronic cigarettes comprises the following specific preparation processes:
firstly, adding a composite lithium cobaltate material, carbon nanotube conductive slurry, conductive carbon black and polyvinylidene fluoride into a stirrer, simultaneously adding a solvent into the stirrer, mixing the materials by the stirrer to obtain anode slurry, uniformly coating the prepared anode slurry on an aluminum foil with the thickness of 14 mu m, and rolling and slitting the aluminum foil to obtain an anode sheet;
preferably, the composite lithium cobaltate material: carbon nanotube conductive paste: conductive carbon black polyvinylidene fluoride 97.1: 1:0.5: 1.4;
the composite lithium cobaltate material is prepared by the following steps:
step 1: adding graphene, polyvinylpyrrolidone and polyvinylidene fluoride into a solvent N-methyl pyrrolidone, and uniformly mixing to form slurry containing graphene; the number of layers of the graphene is 1, the graphene accounts for 5 wt% of the slurry, the polyvinylpyrrolidone accounts for 0.3 wt% of the slurry, and the polyvinylidene fluoride accounts for 0.4 wt% of the slurry;
step 2: mixing the slurry containing graphene with lithium cobaltate, then adding the mixture into a solvent N-methyl pyrrolidone, and mixing for 3 hours in an environment within 45 ℃ to obtain a mixture; the weight ratio of the graphene slurry to the lithium cobaltate is 3:1, the solid content of the mixture is 65%, and the viscosity is 3000 mpa.s;
and step 3: drying the mixture, grinding the mixture into powder with the average particle size of 12 microns to obtain the graphene modified lithium cobaltate cathode material;
secondly, adding artificial graphite, Super-p, CMC and SBR into a stirrer, adding deionized water into the stirrer, mixing the materials by the stirrer to obtain negative electrode slurry, uniformly coating the prepared negative electrode slurry on copper foil with the thickness of 8 mu m, and rolling and slitting the copper foil to obtain a negative electrode sheet;
preferably, the artificial graphite: super-p: the mass ratio of CMC to SBR is 95.1:1:1.5: 2.4;
the artificial graphite is obtained by optimally screening negative electrode particles, the proportion of the negative electrode particles with the particle size of 10-12 microns is 60% -80%, 10% -20% of the negative electrode particles with the particle size of 3-5 microns are doped, and 10% -20% of the negative electrode particles with the particle size of 25-28 microns are doped;
thirdly, winding the pole pieces and the isolating film prepared in the first step and the second step together by a winding machine to form a winding core, wherein the used PE film with the diaphragm thickness of 20um and the porosity of 48 percent;
fourthly, placing the winding core obtained in the third step into an aluminum plastic film, packaging to form a battery cell, baking the battery cell at 85 ℃, and then injecting electrolyte into the battery cell;
the adopted electrolyte consists of a solvent, lithium salt and an additive;
wherein the solvent consists of 20 to 30 weight percent of ethylene carbonate EC, 5 to 15 weight percent of dimethyl carbonate DMC, 15 to 25 weight percent of ethyl methyl carbonate EMC and 25 to 35 weight percent of dibutyl carbonate DBC;
the additive consists of 3 to 5 weight percent of vinylene carbonate VC and 3 to 5 weight percent of 1-ethyl-3-methylimidazole lithium tetrafluoroborate EMIMBF 4;
the lithium salt is a mixture of lithium hexafluorophosphate LiPF6, lithium bis (oxalato) borate LiBOB and lithium difluoro (oxalato) borate LiODFB, and the weight ratio of the lithium salt is 10-15%, wherein the volume mass ratio of the lithium hexafluorophosphate to the lithium bis (oxalato) borate to the lithium difluoro (oxalato) borate is 5:1: 1;
and fifthly, performing formation, secondary sealing and capacity grading on the prepared battery core to obtain the lithium ion battery.
The invention has the beneficial effects that:
1. the positive electrode adopts the graphene modified lithium cobaltate material, the graphene can be uniformly dispersed among particles of the lithium cobaltate positive electrode material, and the graphene on the surface of the lithium cobaltate positive electrode plays a role in fixing O atoms on the surface of the material, so that the structure of the material is stabilized, the decomposition of electrolyte on the surface of the lithium cobaltate positive electrode is inhibited, and the cycle performance, especially the low-temperature cycle performance, of the material is improved.
2. According to the negative electrode disclosed by the invention, through optimizing and screening the graphite particle size, the lithium ion intercalation rate of the negative electrode can be improved by a small particle size, the tap density of the negative electrode material can be ensured by a large particle size, and the low-temperature discharge performance can be improved.
3. The invention adopts the diaphragm with high porosity, improves the transmission rate of lithium ions in the diaphragm, and thus improves the quick charging performance of the battery.
4. The electrolyte is prepared by reasonably proportioning the three electrolyte lithium salts, so that the problems of poor thermal stability and high temperature decomposition of single lithium hexafluorophosphate can be solved, a good SEI film can be formed, and meanwhile, the invention reduces the condensation tendency of the electrolyte and improves the interface properties of the surfaces of the positive electrode and the negative electrode and the electrolyte by optimizing the proportioning components of the electrolyte, thereby realizing the charging and discharging performances of the lithium ion battery in a low-temperature environment of-40 ℃.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A preparation method of an ultralow-temperature flexible-package lithium ion battery for electronic cigarettes comprises the following specific preparation processes:
(1) adding a composite lithium cobaltate material, carbon nanotube conductive slurry, conductive carbon black and polyvinylidene fluoride into N-methyl pyrrolidone, wherein the composite lithium cobaltate material comprises the following components in percentage by weight: carbon nanotube conductive paste: conducting carbon black, namely polyvinylidene fluoride (97.1: 0.5: 1.4), stirring in a vacuum stirrer to form uniform anode slurry, uniformly coating the prepared slurry on an aluminum foil with the thickness of 14 mu m, and rolling and slitting to obtain an anode sheet;
the preparation method of the composite lithium cobaltate material comprises the following steps:
step 1: adding graphene, polyvinylpyrrolidone and polyvinylidene fluoride into a solvent N-methyl pyrrolidone, and uniformly mixing to form slurry containing graphene; wherein the number of layers of the graphene is 1, the graphene accounts for 5 wt% of the slurry, the polyvinylpyrrolidone accounts for 0.3 wt% of the slurry, and the polyvinylidene fluoride accounts for 0.4 wt% of the slurry;
step 2: mixing the slurry containing graphene with lithium cobaltate, then adding the mixture into a solvent N-methyl pyrrolidone, and mixing for 3 hours in an environment within 45 ℃ to obtain a mixture; wherein the weight ratio of the graphene slurry to the lithium cobaltate is 3:1, the solid content of the mixture is 65%, and the viscosity is 3000 mpa.s;
and step 3: drying the mixture, grinding the mixture into powder with the average particle size of 12 mu m to obtain a composite lithium cobaltate material;
(2) adding artificial graphite, conductive carbon black SP, carboxymethyl cellulose CMC and styrene butadiene rubber SBR into deionized water to obtain negative electrode slurry, uniformly coating the prepared slurry on a copper foil with the thickness of 8um, and rolling and slitting to obtain a negative electrode sheet, wherein the artificial graphite comprises the following components in percentage by weight: super-p: the mass ratio of CMC to SBR is 95.1:1:1.5:2.4, the artificial graphite is optimally screened for negative electrode particles, the negative electrode particles with the particle size of 10-12 microns account for 60 percent, 20 percent of the negative electrode particles with the particle size of 3-5 microns are doped, and 20 percent of the negative electrode particles with the particle size of 25-28 microns are doped;
(3) winding the pole pieces and the isolating film prepared in the first step and the second step together by a winding machine to form a winding core, wherein the used PE film with the diaphragm thickness of 20um has the porosity of 48%;
(4) placing the coiled core obtained in the third step into an aluminum-plastic film, packaging to form a battery cell, baking the battery cell at 85 ℃, and then injecting electrolyte into the battery cell;
the adopted electrolyte consists of a solvent, lithium salt and an additive;
the electrolyte solvent comprises 20% by weight of ethylene carbonate, 5% by weight of dimethyl carbonate, 15% by weight of ethyl methyl carbonate and 25% by weight of dibutyl carbonate
The additive consists of vinylene carbonate 3 wt% and 1-ethyl-3-methylimidazolium lithium tetrafluoroborate 5 wt%
The lithium salt is a mixture of lithium hexafluorophosphate LiPF6, lithium bis (oxalato) borate LiBOB and lithium difluoro (oxalato) borate LiODFB, and the weight ratio of the lithium salt is 10%, wherein the volume mass ratio of the lithium hexafluorophosphate to the lithium bis (oxalato) borate LiBOB to the lithium difluoro (oxalato) borate is 5:1: 1.
And fifthly, performing formation, secondary sealing and capacity grading on the prepared battery core to obtain the lithium ion battery.
Example 2:
a preparation method of an ultralow-temperature flexible-package electronic cigarette lithium ion battery is the same as that in example 1, but the artificial graphite of a negative electrode is used for optimally screening negative electrode particles, wherein the proportion of the negative electrode particles with the particle size of 10-12 microns is 80%, 10% of the negative electrode particles with the particle size of 3-5 microns are doped, and 10% of the negative electrode particles with the particle size of 25-28 microns are doped;
meanwhile, the components of the electrolyte are different, and the electrolyte comprises a solvent, lithium salt and an additive;
the electrolyte solvent consists of 30% by weight of ethylene carbonate, 15% by weight of dimethyl carbonate, 25% by weight of ethyl methyl carbonate and 35% by weight of dibutyl carbonate;
the additive consists of vinylene carbonate with the weight ratio of 5 percent and 1-ethyl-3-methylimidazolium lithium tetrafluoroborate with the weight ratio of 3 percent;
the lithium salt is a mixture of lithium hexafluorophosphate LiPF6, lithium bis (oxalato) borate LiBOB and lithium difluoro (oxalato) borate LiODFB, and the weight ratio of the lithium salt is 15%, wherein the volume mass ratio of the lithium hexafluorophosphate to the lithium bis (oxalato) borate LiBOB to the lithium difluoro (oxalato) borate is 5:1: 1.
Example 3:
a preparation method of an ultralow-temperature flexible-package electronic cigarette lithium ion battery is the same as that in example 1, but the used artificial graphite of a negative electrode is obtained by optimally screening negative electrode particles, wherein the proportion of the negative electrode particles with the particle size of 10-12 microns is 70%, 10% of the negative electrode particles with the particle size of 3-5 microns are doped, and 20% of the negative electrode particles with the particle size of 25-28 microns are doped;
the adopted electrolyte consists of a solvent, lithium salt and an additive;
the electrolyte solvent consists of 25% by weight of ethylene carbonate, 10% by weight of dimethyl carbonate, 20% by weight of ethyl methyl carbonate and 30% by weight of dibutyl carbonate;
the additive consists of vinylene carbonate with the weight ratio of 3 percent and 1-ethyl-3-methylimidazolium lithium tetrafluoroborate with the weight ratio of 5 percent;
the lithium salt is a mixture of lithium hexafluorophosphate LiPF6, lithium bis (oxalato) borate LiBOB and lithium difluoro (oxalato) borate LiODFB, the weight ratio of the lithium salt is 13%, and the volume mass ratio of the lithium hexafluorophosphate, the lithium bis (oxalato) borate LiBOB and the lithium difluoro (oxalato) borate is 5:1: 1.
Example 4
A preparation method of an ultralow-temperature flexible-package electronic cigarette lithium ion battery is the same as that in example 1, but the used artificial graphite of a negative electrode is obtained by optimally screening negative electrode particles, wherein the proportion of the negative electrode particles with the particle size of 10-12 microns is 75%, 15% of the negative electrode particles with the particle size of 3-5 microns are doped, and 10% of the negative electrode particles with the particle size of 25-28 microns are doped;
the adopted electrolyte consists of a solvent, lithium salt and an additive;
the electrolyte solvent consists of 20% by weight of ethylene carbonate, 10% by weight of dimethyl carbonate, 20% by weight of ethyl methyl carbonate and 30% by weight of dibutyl carbonate;
the additive consists of vinylene carbonate with the weight ratio of 3% and 1-ethyl-3-methylimidazolium lithium tetrafluoroborate with the weight ratio of 3%;
the lithium salt is a mixture of lithium hexafluorophosphate LiPF6, lithium bis (oxalato) borate LiBOB and lithium difluoro (oxalato) borate LiODFB, the weight ratio of the lithium salt is 15%, and the volume mass ratio of the lithium hexafluorophosphate, the lithium bis (oxalato) borate LiBOB and the lithium difluoro (oxalato) borate is 5:1: 1.
Comparative example 1
The comparative example is different in that unmodified lithium cobaltate and a PE film with a thickness of 20um and a diaphragm gap of 38-42% are used as the positive electrode, and other materials are the same as those in example 1.
Comparative example 2
The negative electrode graphite used in this comparative example was obtained without particle-optimized screening, and the other materials were the same as those in example 1.
Comparative example 3
The comparative example was the same as example 3 in terms of the materials and proportions of the positive and negative electrodes, except that the electrolyte solvent used was a mixture of the electrolyte solvent and the solvent in a weight ratio of 1:1: 1:1 ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and dibutyl carbonate. The lithium salt is a mixture of lithium hexafluorophosphate LiPF6, lithium bis (oxalato) borate LiBOB and lithium difluoro (oxalato) borate LiODFB, and the weight ratio of the lithium salt is 15%.
Comparative example 4
This comparative example was the same as example 4 in the materials and proportions of the positive and negative electrodes, and the electrolyte solvent was the same except that 15% by weight of lithium hexafluorophosphate was used as the electrolyte lithium salt.
The prepared soft package electronic cigarette lithium ion battery 10450P500mAh battery and the comparative battery are tested as follows:
1) normal temperature capacity test at 23 ± 2 ℃: discharging to 3.0V at constant current of 0.2C at the normal temperature of 23 +/-2 ℃, standing for 5min, then charging to 4.20V at constant current and constant voltage of 0.2C, stopping charging current of 0.02C, standing for 10min, discharging to 3.0V at constant current of 0.2C, and testing the normal temperature capacity of the battery.
2) Discharging to 3.0V at constant current of 0.2C under the normal temperature environment of 23 plus or minus 2 ℃, standing the battery for 4h under the low temperature environment of minus 40 ℃, then charging to 4.20V at constant current and constant voltage of 0.1C, stopping the charging current of 0.02C, and testing the low temperature charging capacity of minus 40 ℃.
3) Standing the battery subjected to the low-temperature charging test for 4 hours at the normal temperature of 23 +/-2 ℃, then discharging to 3.0V at a constant current of 0.2C, standing for 5 minutes, then charging to 4.20V at a constant current and a constant voltage of 0.2C, stopping the charging current of 0.02C, standing for 5 minutes, then discharging to 3.0V at a constant current of 0.2C, testing the normal-temperature recovery capacity of the battery, and testing and comparing results as shown in tables 1 and 2.
TABLE 1 comparison table of recovery table capacity and normal temperature capacity of battery after low temperature
TABLE 2 comparison of charging Capacity at 40 ℃ to Normal temperature Capacity
As can be seen from comparison between comparative example 1 and example 1 in table 1, the graphene-modified lithium cobaltate stabilizes the material structure, inhibits decomposition of the electrolyte on the surface of the lithium cobaltate positive electrode, and improves the cycle performance of the material, and the high-porosity diaphragm is adopted to increase the transmission rate of lithium ions in the diaphragm, thereby improving the quick charge performance, especially the low-temperature cycle performance, of the battery.
As can be seen from comparison between comparative example 2 and example 2 in table 1, by optimizing and screening the graphite particle size, the small particle size can increase the lithium ion intercalation rate of the negative electrode, and the large particle size can ensure the tap density of the negative electrode material and also can improve the low-temperature performance of the lithium ion battery.
It can be seen from comparison of comparative examples 3 and 4 with examples 3 and 4 in table 1 that the lithium ion battery can not only solve the problem of poor thermal stability due to the use of single lithium hexafluorophosphate by reasonably proportioning the three electrolyte lithium salts, but also form a good SEI film, and simultaneously reduce the condensation tendency of the electrolyte and improve the interfacial properties between the positive and negative electrode surfaces and the electrolyte by optimizing the proportioning components of the electrolyte, thereby realizing the charging and discharging performance of the lithium ion battery in a low-temperature environment of-40 ℃.
As can be seen from the comparison of the data in tables 1 and 2, the battery of the invention has excellent performance in low-temperature charging compared with a comparative battery, the charging capacity of the battery reaches more than 90% of the capacity at the normal temperature of 23 +/-2 ℃ under the low-temperature environment of minus 40 ℃, the recovery capacity of the battery is not lower than 95% of the original normal-temperature capacity when the battery is recovered to the normal-temperature environment, and after multiple charging and discharging cycles, the adverse phenomena of lithium precipitation and the like do not exist in the battery after the battery is dissected, so that the lithium ion battery is a lithium ion battery which can be applied to the charging and discharging under the low-temperature.
The process method provided by the invention enables the battery to be charged and discharged in a low-temperature environment of-40 ℃, the charging capacity reaches more than 90% of the capacity at the normal temperature of 23 +/-2 ℃, the recovery capacity is not lower than 95% of the original normal-temperature capacity when the battery is recovered to the normal-temperature environment, and after repeated charging and discharging cycles, no adverse phenomena such as lithium precipitation and the like exist in the battery after the battery is dissected, so that the lithium ion battery can be applied to the charging and discharging in the low-temperature environment of-40 ℃ or above.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A preparation method of an ultralow-temperature flexible-package lithium ion battery for electronic cigarettes is characterized by comprising the following specific preparation processes:
firstly, adding a composite lithium cobaltate material, carbon nanotube conductive slurry, conductive carbon black and polyvinylidene fluoride into a stirrer, simultaneously adding a solvent into the stirrer, mixing the materials by the stirrer to obtain anode slurry, and preparing the prepared anode slurry into an anode sheet;
the composite lithium cobaltate material is prepared by the following steps:
step 1: adding graphene, polyvinylpyrrolidone and polyvinylidene fluoride into a solvent N-methyl pyrrolidone, and uniformly mixing to form slurry containing graphene;
step 2: mixing the slurry containing graphene with lithium cobaltate, then adding the mixture into a solvent N-methyl pyrrolidone, and mixing for 3 hours in an environment within 45 ℃ to obtain a mixture;
and step 3: drying the mixture, and grinding the mixture into powder to obtain a graphene modified lithium cobaltate positive electrode material;
secondly, winding the prepared positive pole piece, the prepared negative pole piece and the prepared isolating film together by a winding machine to form a winding core;
and thirdly, placing the obtained roll core into an aluminum plastic film, injecting electrolyte into the battery cell after baking, and then carrying out formation, secondary sealing and capacity grading on the prepared battery cell to obtain the lithium ion battery.
2. The preparation method of the ultra-low temperature soft package electronic cigarette lithium ion battery according to claim 1, characterized in that in the first step, a lithium cobaltate material is compounded: carbon nanotube conductive paste: conductive carbon black polyvinylidene fluoride 97.1: 1: 0.5:1.4.
3. The preparation method of the ultra-low temperature soft-packing electronic cigarette lithium ion battery according to claim 1, wherein in the step 1, the number of graphene layers is 1, graphene accounts for 5 wt% of the slurry, polyvinylpyrrolidone accounts for 0.3 wt% of the slurry, and polyvinylidene fluoride accounts for 0.4 wt% of the slurry.
4. The preparation method of the ultra-low temperature flexible package electronic cigarette lithium ion battery as claimed in claim 1, wherein the weight ratio of the graphene slurry to the lithium cobaltate in the step 2 is 3:1, the solid content of the mixture is 65%, and the viscosity is 3000 mpa.s.
5. The preparation method of the ultra-low temperature flexible package electronic cigarette lithium ion battery according to claim 1, characterized in that the specific preparation process of the negative electrode plate in the second step is as follows: adding artificial graphite, Super-p, CMC and SBR into a stirrer, adding deionized water into the stirrer, mixing the materials by the stirrer to obtain negative electrode slurry, uniformly coating the prepared negative electrode slurry on copper foil with the thickness of 8 mu m, and rolling and slitting to obtain the negative electrode sheet.
6. The preparation method of the ultra-low temperature flexible package electronic cigarette lithium ion battery according to claim 5, characterized in that the artificial graphite: super-p: the mass ratio of CMC to SBR was 95.1:1:1.5: 2.4.
7. The preparation method of the ultra-low temperature soft-packing electronic cigarette lithium ion battery according to claim 5 or 6, characterized in that the proportion of the negative electrode particles with the particle size of the artificial graphite of 10-12 microns is 60% -80%, 10% -20% of the negative electrode particles with the particle size of 3-5 microns are doped, and 10% -20% of the negative electrode particles with the particle size of 25-28 microns are doped.
8. The method for preparing the lithium ion battery of the ultra-low temperature flexible package electronic cigarette according to claim 1, wherein the electrolyte in the third step is composed of a solvent, a lithium salt and an additive; wherein the solvent consists of 20 to 30 weight percent of ethylene carbonate EC, 5 to 15 weight percent of dimethyl carbonate DMC, 15 to 25 weight percent of ethyl methyl carbonate EMC and 25 to 35 weight percent of dibutyl carbonate DBC; the additive consists of 3 to 5 weight percent of vinylene carbonate VC and 3 to 5 weight percent of 1-ethyl-3-methylimidazole lithium tetrafluoroborate EMIMBF 4; the lithium salt is a mixture of lithium hexafluorophosphate LiPF6, lithium bis (oxalato) borate LiBOB and lithium difluoro (oxalato) borate LiODFB, and the weight ratio of the lithium salt is 10-15%.
9. The preparation method of the ultra-low temperature soft-packaged lithium ion battery for the electronic cigarettes of claim 8, wherein the volume-to-mass ratio of the lithium hexafluorophosphate to the lithium bis (oxalato) borate to the lithium difluoro (oxalato) borate is 5:1: 1.
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