CN104681876A - Formation method for improving comprehensive chemical property of lithium iron phosphate battery - Google Patents
Formation method for improving comprehensive chemical property of lithium iron phosphate battery Download PDFInfo
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- CN104681876A CN104681876A CN201510056779.3A CN201510056779A CN104681876A CN 104681876 A CN104681876 A CN 104681876A CN 201510056779 A CN201510056779 A CN 201510056779A CN 104681876 A CN104681876 A CN 104681876A
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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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- 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
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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 formation method for improving the comprehensive chemical property of a lithium iron phosphate battery. The formation method is characterized in that a lithium ion battery which takes lithium iron phosphate as a positive electrode and artificial graphite as a negative electrode is subjected to vacuumization in three periods in the formation process, each period is determined according to formation voltage, different negative pressures are adopted to vacuum the battery, and the vacuum negative pressure value of each period is linearly increased until formation is completed. By adopting the formation method, the formation quality of an SEI membrane can be effectively improved, the comprehensive electrochemical property of the battery can be improved, and the production cost of the battery can be also effectively lowered.
Description
Technical field
The present invention relates to lithium ion battery production technical field, particularly relate to one just very LiFePO4, negative pole is the compound method for lithium ion battery of Delanium.
Background technology
Lithium ion battery has safety, stability is high, specific energy is large, memory-less effect, quickly-chargeable, have extended cycle life, the advantage such as pollution-free, is widely used in large-scale and lightweight electric powered vehicles, light-weight electric instrument, the energy storage device of solar energy and wind power generation, the aspects such as mobile communication equipment, therefore to the performance of lithium ion battery and structural requirement more and more higher, be the Main way of current battery circle research and development.
In the production process of lithium ion battery, changing into is extremely important operation, and it carries out initial activation to inside battery active material.In this process, negative terminal surface forms one deck solid electrolyte membrane and SEI (solid electrolyte interface) film.SEI film anticathode material can produce protective effect, and material structure is not easily caved in, thus increases the cycle life of lithium ion battery, allows lithium ion battery to carry out the electric discharge behavior of suitable multiplying power.Therefore performance of lithium ion battery depends on the whether good of formation effect to a great extent.
And in the process formed at SEI film, the chemical reaction of electrolyte, electrolyte and lithium ion generation series of complex also produces the imflammable gas such as ethene, hydrogen, carbon monoxide.If discharge these gases not in time on the one hand, can cause between battery pole piece and barrier film and produce bubble, cause forming good SEI film, when inside battery thermal runaway, these imflammable gas can cause very large potential safety hazard on the other hand.
Traditional chemical synthesis technology of remaining silent is bled after changing into end, but produce bubble between SEI film forming process septation and pole piece after, SEI film is just difficult to continued growth again, the formation having changed into rear SEI film completes substantially, so at this time go again to bleed to improve the film-formation result of SEI film, just simple removing inside battery gas.
And although traditional open formation technique can allow the gas produced in formation process discharge, but owing to being in the environment of opening, inside battery is easy to touch air, be mixed into foreign gas and participate in inside battery electrochemical reaction, also have moisture to enter inside battery simultaneously, react with electrolyte and produce hydrofluoric acid corroding electrode surface.Although battery can be positioned in drying shed and carry out open formation and solve the impact of moisture on battery performance, which increase production cost, and also not obvious to the raising of battery performance.
Summary of the invention
The object of this part is some aspects of general introduction embodiments of the invention and briefly introduces some better embodiment.May do in the specification digest and denomination of invention of this part and the application a little simplify or omit with avoid making this part, specification digest and denomination of invention object fuzzy, and this simplification or omit and can not be used for limiting the scope of the invention.
In view of Problems existing in the chemical synthesizing method of above-mentioned and/or existing raising ferric phosphate lithium cell comprehensive electrochemical, propose the present invention.
Therefore, the object of this invention is to provide a kind of chemical synthesizing method improving ferric phosphate lithium cell comprehensive electrochemical, it both can solve the problem that in formation process, gas can not be discharged in time, also can be good at controlling formation process and do not allow air, particularly moisture participates in inside battery chemical reaction, thus the effective formation quality improving SEI film, and then improve the comprehensive electrochemical of battery, can also effectively reduce battery production cost simultaneously.
For solving the problems of the technologies described above, according to an aspect of the present invention, the invention provides following technical scheme: a kind of chemical synthesizing method improving ferric phosphate lithium cell comprehensive electrochemical, it take LiFePO4 as positive pole, Delanium is the lithium ion battery of negative pole, in formation process, adopt three phases to battery vacuum-pumping, each stage is determined with formation voltage, different negative pressure is adopted to vacuumize battery, negative pressure of vacuum value linear increment in each stage, until change into end, be specially: the first stage: when formation voltage is at 0V ~ 2.5V, vacuumize negative pressure value for-0.01MPa ~-0.3MPa, second stage: when formation voltage is at 2.5V ~ 3.2V, vacuumizes negative pressure value for-0.3MPa ~-0.8MPa, phase III: when formation voltage is at 3.2V ~ 3.6V, vacuumize negative pressure value for-0.8MPa ~-0.1MPa.
The invention has the beneficial effects as follows: compare traditional chemical synthesis technology, chemical synthesizing method provided by the invention not only can avoid air and moisture to enter inside battery, the gas produced when can also avoid changing into is discharged in time, greatly can improve the quality that formation process forms SEI film like this, positive plate, barrier film, negative plate are fitted tightly, shorten the distance that lithium ion is deviate from and embedded, reduce the internal resistance of cell, improve the multiplying power discharging property of battery, extend battery, improve battery cryogenic property etc.
Accompanying drawing explanation
Accompanying drawing 1 is adopt in the battery of examples produce of the present invention and comparative example the battery 3C discharge curve comparison diagram adopting tradition to change into explained hereafter.
Accompanying drawing 2 is adopt in the battery of examples produce of the present invention and comparative example the battery 5C discharge curve comparison diagram adopting tradition to change into explained hereafter.
Accompanying drawing 3 is adopt in the battery of examples produce of the present invention and comparative example the battery 7C discharge curve comparison diagram adopting tradition to change into explained hereafter.
Accompanying drawing 4 is adopt in the battery of examples produce of the present invention and comparative example battery-20 DEG C of discharge curve comparison diagrams adopting tradition to change into explained hereafter.
Accompanying drawing 5 is adopt in the battery of examples produce of the present invention and comparative example battery 1C charge and discharge 500 the cyclic curve comparison diagrams adopting tradition to change into explained hereafter.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail below by the specific embodiment of the present invention.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.
Test prepares:
Take LiFePO4 as positive pole, Delanium is negative pole, is 80Ah according to design capacity, produces 200 battery cores, is divided into two groups, often organizes 100.
Embodiment
To first group of 100 battery, the inventive method is adopted to change into:
Take LiFePO4 as positive pole, Delanium is the lithium ion battery of negative pole, in formation process, adopt three phases to battery vacuum-pumping, each stage is determined with formation voltage, adopt different negative pressure to vacuumize battery, negative pressure of vacuum value linear increment in each stage, until change into end, wherein
First stage: when formation voltage is at 0V ~ 2.5V, vacuumize negative pressure value for-0.01MPa ~-0.3MPa;
Second stage: when formation voltage is at 2.5V ~ 3.2V, vacuumizes negative pressure value for-0.3MPa ~-0.8MPa;
Phase III: when formation voltage is at 3.2V ~ 3.6V, vacuumize negative pressure value for-0.8MPa ~-0.1MPa.
Comparative example
Adopt traditional chemical synthesis technology to change into second group of 100 battery, do not vacuumize.
Above 200 batteries adopt identical partial volume technique to carry out partial volume.And screen by following condition:
1, capacity is within ± 1Ah;
2, static pressure reduction is within 1mV;
3, charging and discharging curve mesh degree is more than 90%.
After meeting above condition, often the random extraction of group 10 batteries carry out internal resistance and electrochemical performance data contrast.
Table 1 is the contrast of internal resistance data after two Battery pack partial volumes.In embodiment, the average internal resistance of 10 batteries will lower than the mean value of 10 internal resistances of cell in comparative example, and in embodiment, the internal resistance of every battery is all little than the internal resistance of every battery in comparative example.Illustrate and adopt the inventive method to change into, effectively can reduce the internal resistance of battery.
Internal resistance value comparative unit after table 1 liang Battery pack partial volume: m Ω
The high rate performance of further contrast two Battery pack.
Table 2 is the contrast of two Battery pack 3C discharge capacitances.In embodiment, the average size conservation rate of 10 battery 3C electric discharges is 98.65%, exceed 4 percentage points than the average size conservation rate 94.06% of 10 battery 3C electric discharges in comparative example, and in embodiment, every battery 3C discharge capacitance is all high than the 3C discharge capacitance of every battery in comparative example.
A table 2 liang Battery pack 3C discharge capacitance compares
Table 3 is the contrast of two Battery pack 5C discharge capacitances.In embodiment, the average size conservation rate of 10 battery 5C electric discharges is 98.32%, exceed 3 percentage points than the average size conservation rate 94.85% of 10 battery 5C electric discharges in comparative example, and in embodiment, every battery 5C electric discharge conservation rate is all high than the 5C discharge capacitance of every battery in comparative example.
A table 3 liang Battery pack 5C discharge capacitance compares
Table 4 is the contrast of two Battery pack 7C discharge capacitances.10 electricity in embodiment
The average size conservation rate of 7C electric discharge is 98.95%, exceed nearly 4 percentage points than the average size conservation rate 94.97% of 10 battery 7C electric discharges in comparative example, and in embodiment, every battery 7C discharge capacitance is all high than the 7C discharge capacitance of every battery in comparative example.
A table 4 liang Battery pack 7C discharge capacitance compares
By above table 2, table 3, table 4 can be found out, the battery high rate performance adopting the inventive method to change into production is better than the battery adopting traditional chemical synthesizing method to produce.
The cryogenic property of further contrast two Battery pack.
Table 5 is the contrast of two Battery packs-20 DEG C of discharge capacitances.In embodiment, the average size conservation rate of 10 batteries-20 DEG C of electric discharges is 81.68%, exceed nearly 8 percentage points than the average size conservation rate 73.77% of 10 batteries-20 DEG C of electric discharges in comparative example, and in embodiment, every battery-20 DEG C of discharge capacitances are all high than-20 DEG C of discharge capacitances of every battery in comparative example.Illustrate that the cryogenic property adopting the inventive method to change into produced battery will change into the battery of explained hereafter far away higher than employing tradition.
Table 5 liang Battery pack-20 DEG C of discharge capacitances compare
Finally contrast the cycle performance of two Battery packs.
Table 6 is the contrast of capability retention after the circulation of two Battery pack 0.5C charge and discharge 500 times.In embodiment, after 500 circulations of 10 batteries, average size conservation rate is 87.95%, exceed 3 percentage points than the average size conservation rate 84.22% after 500 circulations of 10 batteries in comparative example, and capability retention in embodiment after 500 circulations of every battery is all high than the capability retention after every battery 500 circulations in comparative example.Illustrate that the cycle performance of battery adopting chemical synthesizing method of the present invention to produce is higher than the cycle performance of battery adopting traditional chemical synthesizing method to produce.
After table 6 liang Battery pack 1C charge and discharge 500 times, capability retention compares
To sum up, chemical synthesizing method provided by the present invention, take LiFePO4 as positive pole, Delanium is the lithium ion battery of negative pole, in formation process, adopt three phases to battery vacuum-pumping, each stage is determined with formation voltage, adopts different negative pressure to vacuumize battery, negative pressure of vacuum value linear increment in each stage, until change into end.This method has following advantage:
1, lithium ion battery internal resistance is effectively reduced;
2, the multiplying power discharging property of lithium ion battery is significantly improved;
3, the low temperature performance of lithium ion battery is improved significantly;
4, the cycle life of lithium ion battery is extended.
It should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. one kind is improved the chemical synthesizing method of ferric phosphate lithium cell comprehensive electrochemical, it is characterized in that: take LiFePO4 as positive pole, Delanium is the lithium ion battery of negative pole, in formation process, adopt three phases to battery vacuum-pumping, each stage is determined with formation voltage, adopts different negative pressure to vacuumize battery, negative pressure of vacuum value linear increment in each stage, until change into end, be specially:
First stage: when formation voltage is at 0V ~ 2.5V, vacuumize negative pressure value for-0.01MPa ~-0.3MPa;
Second stage: when formation voltage is at 2.5V ~ 3.2V, vacuumizes negative pressure value for-0.3MPa ~-0.8MPa;
Phase III: when formation voltage is at 3.2V ~ 3.6V, vacuumize negative pressure value for-0.8MPa ~-0.1MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510056779.3A CN104681876A (en) | 2015-02-03 | 2015-02-03 | Formation method for improving comprehensive chemical property of lithium iron phosphate battery |
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| CN201510056779.3A CN104681876A (en) | 2015-02-03 | 2015-02-03 | Formation method for improving comprehensive chemical property of lithium iron phosphate battery |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579281A (en) * | 2017-08-31 | 2018-01-12 | 北京军秀咨询有限公司 | A kind of formation method of high-capacity power lithium iron phosphate battery |
| CN107634268A (en) * | 2017-09-13 | 2018-01-26 | 中航锂电（洛阳）有限公司 | A kind of negative pressure formation method of lithium ion battery |
| CN108155421A (en) * | 2017-12-29 | 2018-06-12 | 珠海泰坦新动力电子有限公司 | Formation of Li-ion batteries takes out negative pressure technique |
| CN111430822A (en) * | 2020-03-26 | 2020-07-17 | 信义电源(苏州)有限公司 | Lithium battery formation method |
| CN111554991A (en) * | 2020-06-10 | 2020-08-18 | 湖北亿纬动力有限公司 | Negative pressure formation method and battery |
| CN111786042A (en) * | 2020-07-06 | 2020-10-16 | 湖北亿纬动力有限公司 | Method for improving formation fluid loss amount and application thereof |
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| CN101286578A (en) * | 2008-05-23 | 2008-10-15 | 清华大学 | Forming method of lithium ion secondary battery using vacuum system |
| CN101777669A (en) * | 2010-02-02 | 2010-07-14 | 江西联威新能源有限公司 | Precharging formation method for lithium ion battery |
| CN102315417A (en) * | 2011-09-30 | 2012-01-11 | 湖南大学 | Novel liquid injection and activation process for lithium ion batteries |
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2015
- 2015-02-03 CN CN201510056779.3A patent/CN104681876A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101286578A (en) * | 2008-05-23 | 2008-10-15 | 清华大学 | Forming method of lithium ion secondary battery using vacuum system |
| CN101777669A (en) * | 2010-02-02 | 2010-07-14 | 江西联威新能源有限公司 | Precharging formation method for lithium ion battery |
| CN102315417A (en) * | 2011-09-30 | 2012-01-11 | 湖南大学 | Novel liquid injection and activation process for lithium ion batteries |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579281A (en) * | 2017-08-31 | 2018-01-12 | 北京军秀咨询有限公司 | A kind of formation method of high-capacity power lithium iron phosphate battery |
| CN107634268A (en) * | 2017-09-13 | 2018-01-26 | 中航锂电（洛阳）有限公司 | A kind of negative pressure formation method of lithium ion battery |
| CN108155421A (en) * | 2017-12-29 | 2018-06-12 | 珠海泰坦新动力电子有限公司 | Formation of Li-ion batteries takes out negative pressure technique |
| CN111430822A (en) * | 2020-03-26 | 2020-07-17 | 信义电源(苏州)有限公司 | Lithium battery formation method |
| CN111430822B (en) * | 2020-03-26 | 2021-10-26 | 信义电源(苏州)有限公司 | Lithium battery formation method |
| CN111554991A (en) * | 2020-06-10 | 2020-08-18 | 湖北亿纬动力有限公司 | Negative pressure formation method and battery |
| CN111786042A (en) * | 2020-07-06 | 2020-10-16 | 湖北亿纬动力有限公司 | Method for improving formation fluid loss amount and application thereof |
| CN111786042B (en) * | 2020-07-06 | 2021-11-23 | 湖北亿纬动力有限公司 | Method for improving formation fluid loss amount and application thereof |
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Application publication date: 20150603 |