CN110336083A - The chemical synthesizing method of high-multiplying power discharge lithium ion battery - Google Patents
The chemical synthesizing method of high-multiplying power discharge lithium ion battery Download PDFInfo
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- CN110336083A CN110336083A CN201910611687.5A CN201910611687A CN110336083A CN 110336083 A CN110336083 A CN 110336083A CN 201910611687 A CN201910611687 A CN 201910611687A CN 110336083 A CN110336083 A CN 110336083A
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- lithium ion
- ion battery
- multiplying power
- power discharge
- synthesizing method
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- 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
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Abstract
The invention discloses a kind of chemical synthesizing method of high-multiplying power discharge lithium ion battery, lithium ion charging equipment is placed in the environment of temperature is adjusted and works, and lithium ion battery is placed in the adjustable equipment of charging current and carries out initial charge；When lithium ion battery is in charged state, at regular intervals, the mode that lithium ion battery carries out 180 ° of reversings up and down is melted into；After lithium ion battery is fully charged, stop overturning, and the open-circuit condition for keeping lithium ion battery to be in fullcharging electricity is for a period of time, promotes the ageing effect of lithium ion battery；For the present invention by way of being aged again after changing current density, adjustment chemical conversion temperature, dynamic and being melted into, the lithium ion battery of production has the cycle characteristics of long-life in the case where high-multiplying power discharge.
Description
Technical field
The present invention relates to a kind of chemical synthesizing methods of high-multiplying power discharge lithium ion battery.
Background technique
During liquid lithium ionic cell first charge-discharge, electrode material and electrolyte occur instead on solid-liquid phase interface
It answers, forms one layer of passivation layer for being covered in electrode material surface.This passivation layer is a kind of boundary layer, with solid electrolyte
Feature, not still electronic body, and be the excellence conductor of Li+, Li+ can freely be embedded in and take off by the passivation layer
Out, therefore this layer of passivating film is referred to as " solid electrolyte interface film ", abbreviation SEI film.SEI film has organic solvent insoluble,
It can be stabilized in organic electrolyte solution, and solvent molecule cannot be by this layer of passivating film, to can effectively prevent molten
The total insertion of agent molecule, avoids destruction caused by being embedded in altogether electrode material because of solvent molecule, thus substantially increases electrode
Cycle performance and service life.For the battery of high-multiplying power discharge, due to during battery initial discharge in a short time
Inside, which generates amount of heat, increases battery temperature, accelerates lithium ion at interface and quickly discharges shuttle, for having for SEI film
Biggish destruction corrosion function, after SEI film is destroyed, solvent molecule can lead to solvent molecule by this layer of passivating film
Total insertion, solvent molecule is embedded in the destruction caused by electrode material altogether, so that in the subsequent use process, battery is with height
Its cycle life will be greatly reduced when multiplying power discharging.
Summary of the invention
Goal of the invention: the object of the present invention is to provide a kind of chemical synthesizing method of high-multiplying power discharge lithium ion battery, production
Lithium ion battery has the cycle characteristics of long-life in the case where high-multiplying power discharge.
Technical solution: the chemical synthesizing method of high-multiplying power discharge lithium ion battery of the present invention includes the following steps
Step 1, lithium ion charging equipment is placed in the environment of temperature is adjusted and works, and lithium ion battery, which is placed in, to be filled
Initial charge is carried out in the equipment of electric current adjustment；
Step 2, when lithium ion battery is in charged state, at regular intervals, lithium ion battery is carried out up and down
The mode of 180 ° of reversings is melted into；
Step 3, after lithium ion battery is fully charged, stop overturning, and lithium ion battery is kept to be in fullcharging electricity
Open-circuit condition for a period of time, promotes the ageing effect of lithium ion battery.
By using above-mentioned technical proposal, lithium ion charging equipment is put under low temperature environment and is worked, lithium ion charging
Equipment charges to lithium ion battery, and SEI film is formed in during the first charge-discharge of battery, and SEI film becomes under cryogenic conditions
In stabilization.The reaction of electrode surface is the competitive reaction of SEI film a formation and charge transfer.Due to the diffusion speed of various ions
Degree is different different with transference number of ions, so the main body being electrochemically reacted under different current densities is not just identical, film
Composition it is also different, to form stable SEI film by adjusting current density to reach.
The mode of the primary 180 ° of reversings up and down of the intermittent progress of battery is melted into, so that electrolyte divides on pole piece
Cloth is more uniform so that SEI film film forming is uniform.
Above-mentioned steps are intended to improve the stability of SEI film, and can be obtained according to above-mentioned steps in lower temperature environment
Under, can be improved using smaller current density and intermittent reversion lithium battery casing lithium ion SEI film stability, with
Improve the cycle life of lithium ion battery.
The utility model has the advantages that by way of the present invention is changing current density, adjustment is melted into temperature, dynamic is melted into, the lithium of production
Ion battery has the cycle characteristics of long-life in the case where high-multiplying power discharge.
Specific embodiment
Lithium ion battery includes that just extremely nickle cobalt lithium manganate, cathode are being modified artificial graphite, electrolyte system and lithium salts；
Electrolyte system includes propene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate and methyl ethyl ester；Lithium
Salt includes LiPF6 and LiBF4.
The SEI film of lithium ion battery is formed in during the first charge-discharge of battery, lithium ion and electrolyte system, trace
One layer of passivating film that water, HF etc. are formed in graphite surface, SEI film main component be dimerization methyl carbonate lithium,
LiCH2CH2OCO2Li, poly- methyl carbonate lithium, lithium hydroxide, lithium carbonate and lithium fluoride.
Therefore, a kind of chemical synthesizing method of high-multiplying power discharge lithium ion battery of the invention is intended to improve lithium ion battery
SEI membrane stability is to extend the service life cycle of lithium ion battery, comprising the following steps:
Step 1, lithium ion charging equipment is placed in the environment of temperature is adjusted and works, and lithium ion battery, which is placed in, to be filled
Initial charge is carried out in the equipment of electric current adjustment；
Step 2, when lithium ion battery is in charged state, at regular intervals, lithium ion battery is carried out up and down
The mode of 180 ° of reversings is melted into；
Step 3, after lithium ion battery is fully charged, stop overturning, and lithium ion battery is kept to be in fullcharging electricity
Open-circuit condition for a period of time, promotes the ageing effect of lithium ion battery.
In conjunction with above-mentioned steps, check experiment is carried out to four factors, i.e., to temperature condition, current density, electrolyte form
And digestion time carries out check experiment, whether stable with the SEI film for examining lithium ion battery to be formed, whether battery performance reaches
To expection.
One, temperature condition
Consider that lithium ion battery carries out charge and discharge at different temperatures, different effects, therefore, Wo Menshe may be generated
Following several reaction temperatures are determined: -10 DEG C, 10 DEG C, 25 DEG C, 40 DEG C, having carried out under the above-mentioned temperature environment of lithium ion charging equipment pair
Lithium ion battery charging, is tested for the property the battery of different condition, obtained data are as follows:
Table one
As shown in Table 1, in the lower situation of temperature, the stability of SEI film is better, and the circulation of lithium ion battery makes
It is more lengthened with the service life.In the higher situation of temperature, the stability decline of SEI film and electrode cycle degradation, this is because
The dissolution of SEI film and the total insertion of solvent molecule aggravation when high temperature.Simultaneously in the higher situation of temperature, film originally carries out
Reconstruction, the dissolution of film make new film have porous structure with redeposited so that electrolyte and electrode generate into
One step contacts and continues to restore.
Two, current density
The reaction of electrode surface is the competitive reaction of SEI film a formation and charge transfer.Due to the diffusion of various ions
Speed difference and transference number of ions difference, so the main body being electrochemically reacted under different current densities is not just identical,
The composition of film is also different.
It is 0.25mA/cm that current density, which is set separately, in we2, 0.5mA/cm2, 1.0mA/cm2, 2.0mA/cm2Under conditions of
The film formation reaction of progress is tested for the property the battery of different condition, and positive electrode capacity plays test and 10C discharge cycles service life
Test, it is as follows to obtain data:
Table two
As shown in Table 2, when lithium ion charging equipment is charged to lithium ion battery by lesser current density, SEI
Film is more stable, and the service life cycle of lithium ion battery more lengthens.
Three, electrolyte form
Due to being influenced in the intracorporal electrolyte of battery case by gravity factor, electrolyte is more gathered after fluid injection is complete
In the middle and lower part of battery, so that the inner pole piece top of cylindrical battery is in the less lean solution state of electrolyte, and electrolyte
More lower part is for rich solution state.And the film formation reaction of SEI film is mainly the interfacial contact between negative terminal surface and electrolyte
Reaction, therefore the film forming that usually will cause pole piece top and the bottom is uneven, has an impact to battery performance.
We, which set, usually carries out primary 180 ° of reversings up and down by the mode of battery standing chemical conversion and by the every 60min of battery
Mode be melted into so that electrolyte be distributed on pole piece it is more uniform.And different batteries is tested for the property, it obtains
Data it is as follows:
Table three
As shown in Table 3, the lithium ion battery after overturning, SEI film uniform in shaping, the circulation of lithium ion battery make
Use longer life expectancy.
Four, digestion time condition
It has been generally acknowledged that SEI film is formed under specific one current potential, and can form a platform voltage under the current potential,
Cathode interface and charge reaction form SEI film under this platform voltage.But also have document report SEI film formation after one
In the section time, even if inside battery does not have charge transfer, part can also occur with electrolyte and react and lead to film for SEI film itself
Ingredient recombination variation.Therefore, we set the different ageing after chemical conversion, respectively 3h, 6h, 12h, come for 24 hours to not
Battery with condition is tested for the property, and obtained data are as follows:
Table four
As shown in Table 4, it is aged 12~18h, the SEI film that the lithium ion battery being melted under this condition is formed is more stable, and
And there is the preferable high rate cyclic service life.
To sum up, the optimum condition that this method uses is with 0.5mA/cm2To 1.0mA/cm2Current density be melted into, change
At temperature control at -10 DEG C~25 DEG C, ageing 12~for 24 hours, the lithium ion battery being melted under this condition not only has good
Capacity plays, and has the preferable high rate cyclic service life, under conditions of 10C electric discharge, cycle charge-discharge 500 weeks, and capacity
Conservation rate still can reach 85% or more.
Claims (6)
1. a kind of chemical synthesizing method of high-multiplying power discharge lithium ion battery, it is characterised in that the following steps are included:
Step 1, lithium ion charging equipment is placed in the environment of temperature is adjusted and works, and lithium ion battery is placed in charging electricity
It flows and carries out initial charge in adjustable equipment；
Step 2, when lithium ion battery is in charged state, at regular intervals, lithium ion battery fall for 180 ° up and down
The mode turned is melted into；
Step 3, after lithium ion battery is fully charged, stop overturning, and lithium ion battery is kept to be in the open circuit of fullcharging electricity
State for a period of time, promotes the ageing effect of lithium ion battery.
2. the chemical synthesizing method of high-multiplying power discharge lithium ion battery according to claim 1, it is characterised in that in step 1, lithium
Ion battery includes that just extremely nickle cobalt lithium manganate, cathode are being modified artificial graphite, electrolyte system and lithium salts；Electrolyte system
Including propene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate and methyl ethyl ester；Lithium salts includes LiPF6
And LiBF4.
3. the chemical synthesizing method of high-multiplying power discharge lithium ion battery according to claim 1, it is characterised in that in step 1, lithium
The adjustable range of the charging ambient temperature of ion battery is -10 degrees Celsius to 45 degrees Celsius.
4. the chemical synthesizing method of high-multiplying power discharge lithium ion battery according to claim 1, it is characterised in that in step 1, fill
The current density of electricity is 0.25mA/cm2~2.0mA/cm2。
5. the chemical synthesizing method of high-multiplying power discharge lithium ion battery according to claim 1, it is characterised in that, will in step 2
The modes that the every 60min of battery carries out primary 180 ° of reversings up and down are melted into so that electrolyte be distributed on pole piece it is more uniform.
6. the chemical synthesizing method of high-multiplying power discharge lithium ion battery according to claim 1, it is characterised in that old in step 3
Changing the time is 12 hours~24 hours, in order to stablize the component of SEI film, keeps SEI film during subsequent charge and discharge cycles
Integrality.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713315A (en) * | 2020-12-29 | 2021-04-27 | 惠州市恒泰科技股份有限公司 | High-voltage lithium battery and formation process thereof |
| CN112946503A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
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| CN102881942A (en) * | 2012-09-15 | 2013-01-16 | 宁波世捷新能源科技有限公司 | Safety device for formation and sub-capacity of lithium ion battery |
| CN104037456A (en) * | 2014-06-16 | 2014-09-10 | 张晶晶 | Rapid forming process of iron phosphate lithium battery |
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Patent Citations (4)
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| CN102881942A (en) * | 2012-09-15 | 2013-01-16 | 宁波世捷新能源科技有限公司 | Safety device for formation and sub-capacity of lithium ion battery |
| CN104037456A (en) * | 2014-06-16 | 2014-09-10 | 张晶晶 | Rapid forming process of iron phosphate lithium battery |
| CN109802089A (en) * | 2018-12-24 | 2019-05-24 | 中国电子科技集团公司第十八研究所 | Liquid injection and formation method for ultra-large-capacity single battery |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112946503A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
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