CN102097656A - Method for forming high-capacity lithium iron phosphate lithium ion battery - Google Patents
Method for forming high-capacity lithium iron phosphate lithium ion battery Download PDFInfo
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- CN102097656A CN102097656A CN2010106081146A CN201010608114A CN102097656A CN 102097656 A CN102097656 A CN 102097656A CN 2010106081146 A CN2010106081146 A CN 2010106081146A CN 201010608114 A CN201010608114 A CN 201010608114A CN 102097656 A CN102097656 A CN 102097656A
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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 relates to a method for forming a high-capacity lithium iron phosphate lithium ion battery, belonging to the technical field of manufacturing of lithium iron batteries. The method is characterized by comprising the following steps of: firstly, trickle charging, namely carrying out constant-voltage charging until the current is 0.02-0.05C while the charging cutoff voltage is 3.55-3.6V, and then carrying out constant-current discharging at small current; secondly, bulk charging, namely carrying out constant-voltage charging until the current is 0.02-0.05C while the charging cutoff voltage is 3.75-4.0V, and then carrying out the constant-current discharging at small current; and thirdly, trickle charging while the charging cutoff voltage is 3.55-3.6V, thus the lithium ion battery is formed. In the invention, the charging cutoff voltage in the step 1 is limited, thus metal lithium can be prevented from being crystallized at a cathode and the safety of the battery is enhanced; the bulk charging is carried out in the step 2, thus side reaction of the carbon cathode can be complete; and the trickle charging is carried out in the step 3, a stable solid electrolyte membrane can be conveniently formed, and the stability and the cycle performance of the battery can be enhanced.
Description
Technical field
The present invention relates to a kind of compound method for lithium ion battery, particularly relate to a kind of chemical synthesizing method of large-capacity lithium iron phosphate lithium ion battery.
Background technology
At present, the large-capacity lithium iron phosphate lithium rechargeable battery has extensive use with its good charge-discharge characteristic, high security and stable circulation performance in fields such as miniature power unit, hybrid vehicle, pure electronic big buses.But, under present existing material system and production technology, too high pursuit energy density, have only and increase LiFePO4 cell capacity and improve battery plus-negative plate material capacity proportioning, especially the latter's change, in formation process,, will increase negative pole lithium metal crystal and separate out possibility because little electric current constant current charge upper voltage limit is provided with improperly; Simultaneously, because in the later stage large current charge process, the negative pole volume changes, the particle cracking, cause new surface, with electrolyte generation chemical reaction, form new solid electrolyte film, produce gas, destroy and formed solid electrolyte film, thereby reduce the safety and stability performance of battery greatly, and then influence cell integrated performance, be unfavorable for ferric phosphate lithium cell marketization application.
Summary of the invention
Separate out in order to overcome in the large-capacity lithium iron phosphate lithium ion battery formation process negative pole lithium metal crystal, and negative pole particle cracking under the large current charge situation, cause side reaction to take place, thereby influence battery security and stable deficiency, the invention provides a kind of new ferric phosphate lithium ion battery chemical synthesizing method, this method is by limiting initial little electric current constant current charge voltage, can avoid separating out of negative pole lithium metal crystal, and with behind the large current charge, little electric current continues charging, the negative pole side reaction was taken place fully in the stage of changing into, thereby increase the fail safe and stability of battery.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Comprise following discharging and recharging the stage: in the low current charge stage 1, current range is 0.02C-0.2C, is 3.55V-3.6V by voltage; The constant voltage charging stage 2 is 0.02C-0.05C by electric current; In the little electric current constant-current discharge stage 3, current range is 0.2C-0.5C, is 2.0V-2.5V by voltage; In the large current charge stage 4, current range is 1C-5C, is 3.75V-4.0V by voltage; The constant voltage charging stage 5 is 0.02C-0.05C by electric current; In the little electric current constant-current discharge stage 6, current range is 0.2C-0.5C, is 2.0V-2.5V by voltage; In the low current charge stage 7, current range is 0.02C-0.2C, is 3.55V-3.6V by voltage, finishes ferric phosphate lithium cell and changes into;
The described low current charge stage, adopt single little electric current constant current charge, industry can adopt different little electric current constant current ladder chargings;
The described large current charge stage, adopt single big electric current constant current charge, also can adopt different big electric current constant current ladder chargings;
Described difference discharged and recharged between the stage can shelve certain hour.
The invention has the advantages that:
1, the low current charge voltage limit is suitable, especially increase energy content of battery density, when improving ferric phosphate lithium cell both positive and negative polarity capacity ratio, can effectively avoid changing into separating out of lithium metal crystal on the stage negative pole, reduce the generation of battery side reaction, improve battery safety;
2, behind the battery large current charge, change into, the negative material side reaction is taken place fully, be beneficial to and form stable solid electrolyte film, improve stability test and cycle performance, promote the application of large-capacity lithium iron phosphate Battery Market with little electric current.
Description of drawings
Figure is each stage schematic diagram of the present invention;
The drawing explanation
The little electric current constant-current discharge stage of 1-low current charge stage 2-constant voltage charge stage 3-
The little electric current constant-current discharge stage of 4-large current charge stage 5-constant voltage charge stage 6-
The 7-low current charge stage
Embodiment
Below in conjunction with drawings and Examples the inventive method is further described:
Make the 50Ah ferric phosphate lithium ion battery and change into by the stage shown in the figure, 1 respectively with 1.5A electric current constant current charge 1.5 hours, 5A electric current constant current charge 6 hours, 10A electric current constant current charge to voltage 3.55V; 2 when voltage reaches 3.55V, transfers constant voltage charge to, reduces to 1A up to electric current, stops charging; 3 discharge with the 10A electric current again, are 2.0V by voltage, stop discharge; 4 then with 50A electric current constant current charge, is set to 3.75V by voltage; 5 when voltage reaches 3.75V, transfers constant voltage charge to, reduces to 1A up to electric current, stops charging; 6 discharge with the 10A electric current again, are 2.0V by voltage, stop discharge; 7 at last with 5A electric current constant current charge, reaches 3.55V up to voltage, stops charging, finishes battery and changes into.
The initial low current charge stage 1 of present embodiment, adopt 1.5A, 5A, the charging of 10A electric current constant current staged respectively, can guarantee to form on the basis of stable state dense solid electrolyte membrane, shorten battery and change into the time, thereby reduce the production cycle, save production cost.
The present embodiment constant voltage charge stage 2 is limited to 3.55V on the cut-ff voltage, can effectively avoid the lithium metal crystalline substance to separate out in negative terminal surface.
Claims (3)
1. a large-capacity lithium iron phosphate compound method for lithium ion battery is characterized in that: may further comprise the steps: low current charge, constant voltage charge; Little electric current constant-current discharge; Large current charge, constant voltage charge; Little electric current constant-current discharge; Low current charge.
2. large-capacity lithium iron phosphate compound method for lithium ion battery according to claim 1 is characterized in that: the low current charge cut-ff voltage is 3.55V-3.60V.
3. large-capacity lithium iron phosphate compound method for lithium ion battery according to claim 1 is characterized in that: the large current charge electric current is 1C-5C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010106081146A CN102097656A (en) | 2010-12-19 | 2010-12-19 | Method for forming high-capacity lithium iron phosphate lithium ion battery |
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| CN2010106081146A CN102097656A (en) | 2010-12-19 | 2010-12-19 | Method for forming high-capacity lithium iron phosphate lithium ion battery |
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| CN102097656A true CN102097656A (en) | 2011-06-15 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856590A (en) * | 2012-09-21 | 2013-01-02 | 深圳市美拜电子有限公司 | Forming and capacity grading method of lithium ion secondary battery |
| CN102886352A (en) * | 2011-07-21 | 2013-01-23 | 湖北骆驼特种电源有限公司 | Group matching and sorting method of lithium iron phosphate batteries |
| CN103066329A (en) * | 2011-10-24 | 2013-04-24 | 深圳市比克电池有限公司 | Lithium ion battery activation method |
| CN103117412A (en) * | 2013-01-31 | 2013-05-22 | 深圳市海太阳实业有限公司 | Lithium ion battery and formation method thereof |
| CN106299483A (en) * | 2016-10-14 | 2017-01-04 | 四川赛尔雷新能源科技有限公司 | A kind of poly-lithium battery naked battery core forming and capacity dividing process |
| CN106469838A (en) * | 2015-08-14 | 2017-03-01 | 深圳市比克动力电池有限公司 | The charging method of cylinder power lithium-ion battery and device |
| CN107039700A (en) * | 2016-08-22 | 2017-08-11 | 杜文龙 | A kind of old dynamic lithium battery improves the multistep chemical synthesizing method of Capacity uniformity |
| CN108400396A (en) * | 2018-03-07 | 2018-08-14 | 中国科学院宁波材料技术与工程研究所 | A method of improving the first charge-discharge specific capacity of lithium ion battery and first effect |
| CN109738824A (en) * | 2018-12-29 | 2019-05-10 | 东莞市金源电池科技有限公司 | A kind of chemical conversion survey appearance method of lithium ion battery |
| CN112713324A (en) * | 2020-12-29 | 2021-04-27 | 惠州亿纬创能电池有限公司 | Formation method for preventing lithium precipitation of negative electrode |
| CN112751090A (en) * | 2021-01-06 | 2021-05-04 | 武汉力兴(火炬)电源有限公司 | Preparation method of high-power ultralow-temperature lithium ion battery |
-
2010
- 2010-12-19 CN CN2010106081146A patent/CN102097656A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886352A (en) * | 2011-07-21 | 2013-01-23 | 湖北骆驼特种电源有限公司 | Group matching and sorting method of lithium iron phosphate batteries |
| CN103066329A (en) * | 2011-10-24 | 2013-04-24 | 深圳市比克电池有限公司 | Lithium ion battery activation method |
| CN103066329B (en) * | 2011-10-24 | 2015-06-17 | 深圳市比克电池有限公司 | Lithium ion battery activation method |
| CN102856590A (en) * | 2012-09-21 | 2013-01-02 | 深圳市美拜电子有限公司 | Forming and capacity grading method of lithium ion secondary battery |
| CN102856590B (en) * | 2012-09-21 | 2014-11-26 | 深圳市美拜电子有限公司 | Forming and capacity grading method of lithium ion secondary battery |
| CN103117412A (en) * | 2013-01-31 | 2013-05-22 | 深圳市海太阳实业有限公司 | Lithium ion battery and formation method thereof |
| CN103117412B (en) * | 2013-01-31 | 2016-08-03 | 深圳市海太阳实业有限公司 | Lithium ion battery and chemical synthesizing method thereof |
| CN106469838A (en) * | 2015-08-14 | 2017-03-01 | 深圳市比克动力电池有限公司 | The charging method of cylinder power lithium-ion battery and device |
| CN107039700A (en) * | 2016-08-22 | 2017-08-11 | 杜文龙 | A kind of old dynamic lithium battery improves the multistep chemical synthesizing method of Capacity uniformity |
| CN107039700B (en) * | 2016-08-22 | 2019-06-18 | 杜文龙 | A kind of old dynamic lithium battery improves the multistep chemical synthesizing method of Capacity uniformity |
| CN106299483A (en) * | 2016-10-14 | 2017-01-04 | 四川赛尔雷新能源科技有限公司 | A kind of poly-lithium battery naked battery core forming and capacity dividing process |
| CN108400396A (en) * | 2018-03-07 | 2018-08-14 | 中国科学院宁波材料技术与工程研究所 | A method of improving the first charge-discharge specific capacity of lithium ion battery and first effect |
| CN108400396B (en) * | 2018-03-07 | 2020-07-07 | 中国科学院宁波材料技术与工程研究所 | Method for improving first charge-discharge specific capacity and first effect of lithium ion battery |
| CN109738824A (en) * | 2018-12-29 | 2019-05-10 | 东莞市金源电池科技有限公司 | A kind of chemical conversion survey appearance method of lithium ion battery |
| CN112713324A (en) * | 2020-12-29 | 2021-04-27 | 惠州亿纬创能电池有限公司 | Formation method for preventing lithium precipitation of negative electrode |
| CN112751090A (en) * | 2021-01-06 | 2021-05-04 | 武汉力兴(火炬)电源有限公司 | Preparation method of high-power ultralow-temperature lithium ion battery |
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Application publication date: 20110615 |