CN101299470A - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN101299470A CN101299470A CNA2008100281298A CN200810028129A CN101299470A CN 101299470 A CN101299470 A CN 101299470A CN A2008100281298 A CNA2008100281298 A CN A2008100281298A CN 200810028129 A CN200810028129 A CN 200810028129A CN 101299470 A CN101299470 A CN 101299470A
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- lithium ion
- ion battery
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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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Abstract
The invention provides a lithium ion cell, including a cathode sheet and an anode strip arranged on the cathode current collector and electrolyte solution, wherein anode active materials contain the lithium iron phosphate and at least an anode active substance with the charging platform higher than the lithium iron phosphate. When the lithium ion cell is charged completely, the steep rise of the cell voltage can be effectively restrained along the increase of the capacitance.
Description
Technical field
The present invention relates to a kind of lithium ion battery, particularly this lithium-ion battery pole winding core needle comprises the cathode active material that LiFePO4 and at least a charging platform are higher than LiFePO4.
Background technology
Lithium ion battery in the short more than ten years, has obtained very fast development since the exploitation of nineteen ninety sony company is come out.Expect 2017, the lithium ion battery demand of 18.71 hundred million mobile phones and 2.93 hundred million notebook computers will be arranged.And because the development of advanced electronic equipment, people increase day by day for small-sized, lightweight, portable electronic equipment and need for equipment, and therefore, need have the good battery of high-energy-density and security performance provides the energy for this equipment and device.
With the battery of LiFePO4 as cathode active material, during, high temperature good with its security performance performance good, have extended cycle life and characteristics such as low price, be widely used in recent years.But because material itself, when the ferric phosphate lithium cell charging finished, cell voltage can sharply rise with the increase of capacity.
On the other hand, for for some electronic equipment provides higher operating voltage, as notebook, electric tool and electric automobile, lithium ion battery often needs connection in series-parallel to use, and this just requires to have consistency preferably between each single battery of connecting.And often make cell when charging, have bigger state difference between the cell because of reasons such as capacity, self discharge, capacity attenuations, can't reach completely synchronously and fill, this moment is if continue charging, voltage rises very fast relatively when at first continuing charging near the battery that completely fills, thereby make this at first near the over-charging of battery that completely fills, cause potential safety hazard, if do not continue charging, other battery capacity is again less than giving full play in the battery pack.
Summary of the invention
The objective of the invention is to prepare a kind of lithium ion battery, this lithium ion battery cathode diaphragm phosphoric acid iron lithium and at least a charging platform are higher than the cathode active material of LiFePO4, when charging finishes, can effectively suppress cell voltage and sharply rise with the increase of capacity.
For achieving the above object, the invention provides a kind of lithium ion battery, this lithium ion battery comprises cathode sheets, barrier film and the anode strip of mutual coiling.Wherein cathode sheets comprise cathode current collector and attached thereto, have a cathode active material that cathode active material LiFePO4 (LiFePO4) and at least a charging platform are higher than LiFePO4.Above-mentioned cathode sheets, barrier film and anode strip stack back reeled makes battery, and battery is packed in the battery packages shell, makes battery after changing into.
The battery of making by above-mentioned condition, when serial connection charge, owing to reasons such as battery capacity, self discharge, capacity attenuation make battery pack each monomer battery voltage when charging have bigger state difference, can't reach completely synchronously and fill, certain cell will be at first near completely filling like this, this monomer battery voltage is about 3.4V, this moment, cathode active material was if be LiFePO4 only, continue charging, because LiFePO4 self charging curve, this monomer battery voltage will increase and sharply rising with capacity.But because this cell negative electrode diaphragm contains other and is higher than the cathode active material that charging platform is higher than LiFePO4, the rate of climb will effectively be suppressed this monomer battery voltage with the capacity increase like this, thereby effectively suppresses to overcharge.
Marginal data
Fig. 1: pure ferric phosphate lithium cell charging capacity and charging voltage change curve.
Fig. 2: cathode active material is the cell charging capacity and the charging voltage change curve of LiFePO4 and lithium nickel cobalt manganese.
Fig. 3: each battery charge capacity of pure ferric phosphate lithium series battery and charging voltage change curve.
Fig. 4: cathode active material is each the battery charge capacity of series battery and the charging voltage change curve of LiFePO4 and lithium nickel cobalt manganese.
Embodiment
A kind of lithium ion battery provided by the invention comprises: mutual cathode sheets, barrier film and anode strip of reeling.Wherein cathode sheets comprise cathode current collector and attached thereto, have a cathode active material that cathode active material LiFePO4 (LiFePO4) and at least a charging platform are higher than LiFePO4, the cathode active material that charging platform is higher than LiFePO4 is selected from but is not limited to following material: lithium nickel cobalt manganese, lithium nickel cobalt aluminium, cobalt acid lithium, LiMn2O4 and lithium nickel manganese.Anode strip comprises anode collector and diaphragm attached thereto, that have anode active material.Isolation diaphragm can adopt the composite porous isolating membrane of polypropylene (PP) and polyethylene (PE), places between cathode sheets and the anode strip.Above-mentioned cathode sheets, barrier film and anode strip stack back reeled makes battery, and battery is packed in the battery packages shell, injects electrolyte in it, makes battery after finding time, sealing.
With LiFePO4 and lithium nickel cobalt manganese as the cathode sheets active material, with account for whole cathodic coating tablet quality than be 6% conductive carbon as conductive agent, 5% Kynoar (PVDF) is as binding agent.It is 89% that active material accounts for whole cathodic coating tablet quality ratio, and the mass ratio that LiFePO4 accounts for active material is 80% between 99.5%, this experimental example preferred 95%; The mass ratio that lithium nickel cobalt manganese accounts for active material is 0.5% between 20%, this experimental example preferred 5%.Above-mentioned powder mixed in the N-methyl pyrrolidone make cathode slurry after stirring, slurry is uniformly coated on the aluminium foil that thickness is 16um, obtain the negative electrode matrix after the drying.The coating weight of matrix is 0.12g/cm, and density is 2.0g/cm after the roll-in
3After cutting, pole piece just obtains the negative electrode pole piece.
With 93.5% Delanium, 1.5% carboxymethyl cellulose (CMC) and 3.0% butadiene-styrene rubber are (SBR) binding agent, 2% conductive carbon is a conductive agent, above-mentioned powder adds in the entry makes anode slurry after the stirring, slurry is uniformly coated on the Copper Foil that thickness is 9um, obtains the anode matrix after the drying.The coating weight of matrix is 0.06g/cm
2, density is 1.4g/cm after the roll-in
3After cutting, pole piece just obtains anode pole piece.
The negative electrode pole piece of making, anode pole piece and barrier film are made naked electric core after reeling, and battery packed in the battery packages shell, in it, inject electrolyte, this electrolyte is lithium salts with the lithium hexafluoro phosphate, ethylene carbonate with 40%, 30% methyl ethyl carbonate and 30% dimethyl carbonate are solvent, make battery again after finding time, seal, changing into.Electrolyte is nonaqueous electrolytic solution.
The charging contrast test:
Contrast test 1: the ferric phosphate lithium cell monomer of pure ferric phosphate lithium battery monomer and negative electrode mixing lithium nickel cobalt manganese is carried out loop test respectively, and charging voltage is 2.0V-3.8V.Charging process is: the 3C constant current is charged to 3.8V, and constant voltage is to 0.05C, when detecting monomer voltage and reach deboost, stops test.Discharge process is: 8C is discharged to 2.0V, when monomer voltage is lower than 1.5V, stops test.Charging curve is respectively as Fig. 1, Fig. 2, and battery is when being full of as can be seen from Figure 1, cell voltage can sharply rise with the increase of capacity, and among Fig. 2, the ferric phosphate lithium cell monomer of negative electrode mixing lithium nickel cobalt manganese, cell voltage obviously slows down with gathering way of capacity.
Contrast test 2: will try the pure ferric phosphate lithium battery and do charging measurement by the triplets series connection, the battery that with the cathode active material in the foregoing description is LiFePO4 and lithium nickel cobalt manganese is again done charging measurement by the triplets series connection, charge condition is: stagnation pressure is 6.0V-11.4V, and the monomer deboost is 1.5V-4.0V.Charging process is: the 3C constant current is charged to 11.4V, and constant voltage is to 0.05C, when detecting monomer voltage and reach deboost, stops test.Discharge process is: 8C is discharged to 6.0V, when monomer voltage is lower than 1.5V, stops test.Experimental result is respectively as Fig. 3, Fig. 4.Among Fig. 3, the pure ferric phosphate lithium battery just phenomenon occurs overcharging because of a spot of capacity difference (about 10mAh) in the first few circulation; And among Fig. 4, cathode active material is that the monomer voltage of the battery of LiFePO4 and lithium nickel cobalt manganese all is lower than 4.0V, good restraining overcharge phenomenon.
Claims (8)
1, a kind of lithium ion battery, this lithium ion battery comprises cathode sheets, barrier film and anode strip, wherein cathode sheets comprises cathode current collector and diaphragm attached thereto, that have the cathode active material LiFePO4; Anode strip comprises anode collector and diaphragm attached thereto, that have anode active material; Barrier film places between cathode sheets and the anode strip, it is characterized in that: the negative electrode diaphragm also contains the cathode active material that at least a charging platform is higher than LiFePO4.
2, a kind of lithium ion battery according to claim 1 is characterized in that: the cathode active material that charging platform is higher than LiFePO4 in the described negative electrode diaphragm is selected from but is not limited to following material: lithium nickel cobalt manganese, lithium nickel cobalt aluminium, cobalt acid lithium, LiMn2O4 and lithium nickel manganese.
3, a kind of lithium ion battery according to claim 2 is characterized in that: in the described negative electrode diaphragm, the mass ratio range that LiFePO4 accounts for cathode active material is 80-99.5%.
4, a kind of lithium ion battery according to claim 3 is characterized in that: in the described negative electrode diaphragm, the preferable range that LiFePO4 accounts for the mass ratio of cathode active material is 90-98%.
5, a kind of lithium ion battery according to claim 1, it is characterized in that: the active material of described negative electrode diaphragm is: LiFePO4 and lithium nickel cobalt manganese.
6, a kind of lithium ion battery according to claim 5 is characterized in that: the mass ratio range that LiFePO4 accounts for cathode active material is 80-99.5%.
7, the preferable range that a kind of lithium ion battery according to claim 6, LiFePO4 account for the mass ratio of cathode active material is 90-98%.
8, according to any one described a kind of lithium ion battery of claim 1-7 item, it is characterized in that: the active material of anode diaphragm is a graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100281298A CN101299470A (en) | 2008-05-16 | 2008-05-16 | Lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100281298A CN101299470A (en) | 2008-05-16 | 2008-05-16 | Lithium ion battery |
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| CN101299470A true CN101299470A (en) | 2008-11-05 |
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| CNA2008100281298A Pending CN101299470A (en) | 2008-05-16 | 2008-05-16 | Lithium ion battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102696138A (en) * | 2009-10-13 | 2012-09-26 | 丰田自动车株式会社 | Nonaqueous electrolyte solution type lithium ion secondary battery |
| CN102903892A (en) * | 2012-10-18 | 2013-01-30 | 江苏富朗特新能源有限公司 | Method for manufacturing industrial energy storage type lithium battery pole piece |
| CN103456918A (en) * | 2012-05-28 | 2013-12-18 | 比亚迪股份有限公司 | Battery anode, preparation method thereof and lithium ion battery using the same |
| CN106920924A (en) * | 2015-12-27 | 2017-07-04 | 深圳市沃特玛电池有限公司 | Anode material of lithium battery, lithium battery anode piece preparation method and lithium battery preparation method |
-
2008
- 2008-05-16 CN CNA2008100281298A patent/CN101299470A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102696138A (en) * | 2009-10-13 | 2012-09-26 | 丰田自动车株式会社 | Nonaqueous electrolyte solution type lithium ion secondary battery |
| US9209462B2 (en) | 2009-10-13 | 2015-12-08 | Toyota Jidosha Kabushiki Kaisha | Non-aqueous electrolyte solution type lithium ion secondary battery |
| CN103456918A (en) * | 2012-05-28 | 2013-12-18 | 比亚迪股份有限公司 | Battery anode, preparation method thereof and lithium ion battery using the same |
| CN103456918B (en) * | 2012-05-28 | 2016-03-30 | 比亚迪股份有限公司 | Anode and preparation method thereof and the lithium ion battery using this positive pole |
| CN102903892A (en) * | 2012-10-18 | 2013-01-30 | 江苏富朗特新能源有限公司 | Method for manufacturing industrial energy storage type lithium battery pole piece |
| CN106920924A (en) * | 2015-12-27 | 2017-07-04 | 深圳市沃特玛电池有限公司 | Anode material of lithium battery, lithium battery anode piece preparation method and lithium battery preparation method |
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Open date: 20081105 |