CN105390760A - Formation method for improving stability of lithium ion battery - Google Patents
Formation method for improving stability of lithium ion battery Download PDFInfo
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- CN105390760A CN105390760A CN201510753809.6A CN201510753809A CN105390760A CN 105390760 A CN105390760 A CN 105390760A CN 201510753809 A CN201510753809 A CN 201510753809A CN 105390760 A CN105390760 A CN 105390760A
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- lithium ion
- ion battery
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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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- Secondary Cells (AREA)
Abstract
The invention relates to a formation method for improving the stability of a lithium ion battery. The invention belongs to the technical scheme of lithium ion batteries. The formation method for improving the stability of the lithium ion battery is characterized by comprising the process steps of performing measurement to determine a membrane-forming potential range of an SEI membrane of the lithium ion battery first, and then performing repeated charging/discharging of less than 0.1C current density under the membrane-forming potential of the SEI membrane to realize step-by-step formation. The method has the advantages that a process is simple, the pertinence is strong, the formation effect is good, the SEI membrane is dense and stable, the electrochemical performance of the lithium ion battery is improved, the cycle life of the lithium ion battery is prolonged, and the like.
Description
Technical field
The invention belongs to technical field of lithium ion, particularly relate to a kind of chemical synthesizing method strengthening lithium ion battery stability.
Background technology
Lithium ion battery is high with its specific energy, have extended cycle life, memory-less effect, stable operating voltage, security performance advantages of higher and be widely used.In formation charging process first, Lithium-ion embeding negative pole, the portion of product of the oxidized generation of electrolyte is deposited on negative terminal surface, forms solid-electrolyte interphace (SEI) film.Stability after SEI film is formed affects very large on the chemical property of battery and cycle life, relatively low forming current density and temperature are conducive to forming stable SEI film.
At present, generally adopt 0.1C discharge and recharge for changing into of lithium ion battery, this is unfavorable for forming stable SEI film.And for different lithium-ion battery systems, the potential range that its SEI film is formed is not quite similar.There is specific aim difference in prior art, formation effect is poor, and the form compact and stable property of the SEI film obtained is poor, is unfavorable for improving the technical problems such as the chemical property of lithium-ions battery and cycle life.
Summary of the invention
The present invention provides a kind of chemical synthesizing method strengthening lithium ion battery stability for solving in known technology the technical problem that exists.
The object of this invention is to provide one, to have technique simple, and with strong points, formation effect is good, and SEI film is form compact and stable, improves the chemical synthesizing method of the enhancing lithium ion battery stability of the features such as the chemical property of lithium-ions battery and cycle life.
The present invention adopts the SEI film film forming potential range of one way electrokinetic potential linear scan voltammetry to specific system lithium-ions battery to measure.First in random choose particular batch, lithium-ions battery to be changed some is measured, because lithium-ions battery is lower at active material intracell solid ionic carry-over factor, therefore relatively low dynamic potential scanning speed is chosen in this measurement, between 0.001mV/s-0.1mV/s, preferred 0.01mV/s.Scan from Open Circuit Potential to cathode direction, reduction peak can be formed on the linear dynamic potential scanning curve of one way when forming SEI film in lithium ion battery, the take-off potential of this peak type and the formation potential range of the basic corresponding SEI film of termination current potential, in order to more accurately change into, 5% can be extended out fully to offset battery polarization impact on this potential range basis.The method can accurately measure different system or batch etc. the film forming potential range of lithium-ions battery SEI film in situation, have stronger specific aim, can effectively avoid different system or batch etc. cause the impact that follow-up chemical synthesizing method is caused of the lithium ion battery SEI film film forming potential difference opposite sex under impact.Next substep being the one-tenth film potential of carrying out SEI film to the lithium-ions battery under this specific system bends down current density repeated charge changes into.First be adopt 0.01C electric current to lithium ion cell charging, and carry out 2-3 0.01C cycle charge discharge electric process in the SEI film film forming potential range that previous step measurement obtains, the method analogy electro-deposition coating method can make SEI more form compact and stable.After this take 0.1C to carry out 2-3 discharge and recharge to lithium ion battery to change into.
The technical scheme that the chemical synthesizing method that the present invention strengthens lithium ion battery stability is taked is:
A kind of chemical synthesizing method strengthening lithium ion battery stability, be characterized in: the processing step strengthening the chemical synthesizing method of lithium ion battery stability is, first the film forming potential range measuring the SEI film determining lithium ion battery is carried out, next carries out lower than 0.1C current density repeated charge under the one-tenth film potential of SEI film, realizes substep and change into.
The chemical synthesizing method that the present invention strengthens lithium ion battery stability can also adopt following technical scheme:
The chemical synthesizing method of described enhancing lithium ion battery stability, is characterized in: measure and determine that the film forming potential range of the SEI film of lithium ion battery adopts the SEI film film forming potential range of one way electrokinetic potential linear scan voltammetry to lithium-ions battery to measure.
The chemical synthesizing method of described enhancing lithium ion battery stability, is characterized in: the film forming potential range of the SEI film of lithium ion battery is 0.001mV/s-0.1mV/s.
The chemical synthesizing method of described enhancing lithium ion battery stability, is characterized in: when carrying out under the one-tenth film potential of SEI film lower than 0.1C current density repeated charge, current density is 0.01C to 0.1C; Repeated charge process: first adopt 0.01C electric current to lithium ion cell charging, carry out 2-3 0.01C cycle charge discharge electric process in the film forming potential range of SEI film, then take 0.1C to carry out 2-3 discharge and recharge to lithium ion battery.
The advantage that the present invention has and good effect are:
Strengthen the chemical synthesizing method of lithium ion battery stability owing to have employed the brand-new technical scheme of the present invention, compared with prior art, the present invention has following distinguishing feature:
1, the SEI film film forming potential range of one way electrokinetic potential linear scan voltammetry to specific system lithium-ions battery is adopted to measure.The method can accurately measure different system or batch etc. the film forming potential range of lithium-ions battery SEI film in situation, have stronger specific aim, can effectively avoid different system or batch etc. cause the impact that follow-up chemical synthesizing method is caused of the lithium ion battery SEI film film forming potential difference opposite sex under impact.
2, the substep taking the one-tenth film potential of carrying out SEI film to the lithium-ions battery under specific system to bend down current density repeated charge changes into.Lithium ion battery can be made to form more form compact and stable SEI film, be conducive to the chemical property and the cycle life that improve lithium-ions battery.
Embodiment
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and be described in detail as follows:
Embodiment 1
A kind of chemical synthesizing method strengthening lithium ion battery stability, processing step is, first carrying out the film forming potential range measuring the SEI film determining lithium ion battery, is secondly carry out 0.01C to 0.1C low current density repeated charge under the one-tenth film potential of SEI film, realizes substep and changes into.
Measure and determine that the film forming potential range of the SEI film of lithium ion battery adopts the SEI film film forming potential range of one way electrokinetic potential linear scan voltammetry to lithium-ions battery to measure.The film forming potential range of the SEI film of lithium ion battery is 0.001mV/s-0.1mV/s.When carrying out low current density repeated charge under the one-tenth film potential of SEI film, current density is; Repeated charge process: first adopt 0.01C electric current to lithium ion cell charging, carry out 2-3 0.01C cycle charge discharge electric process in the film forming potential range of SEI film, then take 0.1C to carry out 2-3 discharge and recharge to lithium ion battery, can complete and change into.
The specific implementation process of the present embodiment:
1, positive pole preparation
In order to the lithium complex metal oxide shown in LiCoO2 as positive active material.Use acetylene black as conductive agent.Use polytetrafluoroethylene and carboxymethyl cellulose as binding agent.Use water as solvent.Use Al paper tinsel as collector body (positive electrode collector).By positive active material, conductive agent, binding agent and solvent, obtain anode mixture slurry.In anode mixture slurry, positive active material: conductive agent: binding agent: the weight ratio of solvent is 92:3:5:45.In binding agent, polytetrafluoroethylene: the weight ratio of carboxymethyl cellulose is 9:1.
Anode mixture slurry is coated the two sides of Al paper tinsel, dry, obtain dry sheet material, this sheet material roll squeezer is pressurizeed, then welds the lead-in wire of aluminum, obtain positive pole sheet material.
2, negative pole preparation
Use native graphite as negative material.Use carboxymethyl cellulose as binding agent.Use water as solvent.Use Copper Foil as collector body (negative electrode collector).By negative material, binding agent and solvent, obtain cathode agent slurry.In cathode agent slurry, negative material: binding agent: the weight ratio of solvent is 98:2:110.Cathode agent slurry is coated the two sides of Copper Foil, dry, obtain dry sheet material, this sheet material roll squeezer is pressurizeed, then welds lead-in wire made of copper, obtain negative electrode plate.
3, lithium ion battery preparation
Above-mentioned positive pole sheet material, barrier film, negative electrode plate, barrier film are stacked gradually, curling, the electrode obtained group is accommodated in battery sleeve, then injects the electrolyte in cylinder, manufacture lithium rechargeable battery.
4, the SEI film film forming potential range of lithium ion battery is measured
Probe temperature 20 DEG C
Adopt one way electrokinetic potential linear scan voltammetry to carry out 0.01mV/s voltammetric scan to lithium ion battery, show that oxidation peak potential range is 1.5-1.9V, extend out the SEI film film forming potential range that 5% selection 1.4V-2.0V is this lithium-ions battery.
5, change into
Test temperature 20 DEG C, fertilizer alleviant is as follows:
The present embodiment has that described technique is simple, and with strong points, formation effect is good, and SEI film is form compact and stable, improves the good effects such as the chemical property of lithium-ions battery and cycle life.
Claims (4)
1. one kind strengthens the chemical synthesizing method of lithium ion battery stability, it is characterized in that: the processing step strengthening the chemical synthesizing method of lithium ion battery stability is, first the film forming potential range measuring the SEI film determining lithium ion battery is carried out, next carries out lower than 0.1C current density repeated charge under the one-tenth film potential of SEI film, realizes substep and change into.
2. the chemical synthesizing method of enhancing lithium ion battery stability according to claim 1, is characterized in that: measure and determine that the film forming potential range of the SEI film of lithium ion battery adopts the SEI film film forming potential range of one way electrokinetic potential linear scan voltammetry to lithium-ions battery to measure.
3. the chemical synthesizing method of enhancing lithium ion battery stability according to claim 1 and 2, is characterized in that: the film forming potential range of the SEI film of lithium ion battery is 0.001mV/s-0.1mV/s.
4. the chemical synthesizing method of enhancing lithium ion battery stability according to claim 1 and 2, is characterized in that: when carrying out under the one-tenth film potential of SEI film lower than 0.1C current density repeated charge, current density is 0.01C to 0.1C; Repeated charge process: first adopt 0.01C electric current to lithium ion cell charging, carry out 2-3 0.01C cycle charge discharge electric process in the film forming potential range of SEI film, then take 0.1C to carry out 2-3 discharge and recharge to lithium ion battery.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058326A (en) * | 2016-08-09 | 2016-10-26 | 天津力神电池股份有限公司 | Lithium ion battery formation method for optimizing performances of SEI membrane |
| CN106898831A (en) * | 2017-04-17 | 2017-06-27 | 西南大学 | In the method at sulfenyl, seleno anode surface construction stable, solid interface |
| CN109713386A (en) * | 2018-12-05 | 2019-05-03 | 上海科比斯实业有限公司 | A kind of chemical synthesizing method of hard carbon cathode material lithium ion battery |
| CN110034336A (en) * | 2019-04-25 | 2019-07-19 | 惠州亿纬锂能股份有限公司 | It is a kind of to form the battery formation method for stablizing SEI film |
| CN110380146A (en) * | 2019-06-11 | 2019-10-25 | 中国电力科学研究院有限公司 | A kind of lithium ion battery targeting chemical synthesizing method and lithium ion battery |
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| JP2001325988A (en) * | 2000-05-16 | 2001-11-22 | Sony Corp | Charging method of non-aqueous electrolyte secondary battery |
| JP2012227035A (en) * | 2011-04-21 | 2012-11-15 | Toyota Motor Corp | Method of manufacturing nonaqueous electrolyte secondary battery |
| CN104332670A (en) * | 2014-10-27 | 2015-02-04 | 山东圣阳电源股份有限公司 | Method for formation charging of lithium iron phosphate battery |
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2015
- 2015-11-05 CN CN201510753809.6A patent/CN105390760A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001325988A (en) * | 2000-05-16 | 2001-11-22 | Sony Corp | Charging method of non-aqueous electrolyte secondary battery |
| JP2012227035A (en) * | 2011-04-21 | 2012-11-15 | Toyota Motor Corp | Method of manufacturing nonaqueous electrolyte secondary battery |
| CN104332670A (en) * | 2014-10-27 | 2015-02-04 | 山东圣阳电源股份有限公司 | Method for formation charging of lithium iron phosphate battery |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058326A (en) * | 2016-08-09 | 2016-10-26 | 天津力神电池股份有限公司 | Lithium ion battery formation method for optimizing performances of SEI membrane |
| CN106898831A (en) * | 2017-04-17 | 2017-06-27 | 西南大学 | In the method at sulfenyl, seleno anode surface construction stable, solid interface |
| CN106898831B (en) * | 2017-04-17 | 2020-04-17 | 青岛九环新越新能源科技股份有限公司 | Method for constructing stable solid interface on surface of positive electrode of sulfur-based and selenium-based battery |
| CN109713386A (en) * | 2018-12-05 | 2019-05-03 | 上海科比斯实业有限公司 | A kind of chemical synthesizing method of hard carbon cathode material lithium ion battery |
| CN110034336A (en) * | 2019-04-25 | 2019-07-19 | 惠州亿纬锂能股份有限公司 | It is a kind of to form the battery formation method for stablizing SEI film |
| CN110034336B (en) * | 2019-04-25 | 2021-12-14 | 惠州亿纬锂能股份有限公司 | Battery formation method for forming stable SEI film |
| CN110380146A (en) * | 2019-06-11 | 2019-10-25 | 中国电力科学研究院有限公司 | A kind of lithium ion battery targeting chemical synthesizing method and lithium ion battery |
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