CN102074732A - Lithium ion battery provided with high molecular weight adhesive - Google Patents
Lithium ion battery provided with high molecular weight adhesive Download PDFInfo
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- CN102074732A CN102074732A CN2010106057289A CN201010605728A CN102074732A CN 102074732 A CN102074732 A CN 102074732A CN 2010106057289 A CN2010106057289 A CN 2010106057289A CN 201010605728 A CN201010605728 A CN 201010605728A CN 102074732 A CN102074732 A CN 102074732A
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- Prior art keywords
- lithium ion
- ion battery
- bonding agent
- molecular weight
- high molecular
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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
Abstract
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery provided with a high molecular weight adhesive. The lithium ion battery is provided with an anode, a cathode and an isolating membrane between the anode and the cathode, wherein the anode comprises a current collector and a coating film which is coated on the surface of the current collector; and the coating film comprises an anode active material, a conductive agent and a polymer serving as the adhesive. The lithium ion battery is characterized in that: the adhesive is polyvinylidene fluoride with the molecular weight of 1,200,000. Due to the adoption of the technical scheme of the high molecular weight adhesive, the active substance content of the lithium ion battery is increased, the gram capacity of mixed powder is increased and the final capacity of the lithium ion battery can be increased by 3 percent.
Description
Technical field:
The present invention relates to technical field of lithium ion, refer in particular to a kind of lithium ion battery with HMW bonding agent.
Background technology:
Common lithium ion battery is to be superposeed successively by positive pole, isolation diaphragm, negative pole to form, and its inside is added with electrolyte.
When making lithium battery, need coating one deck active material on the positive electrode of battery, this active matter material require passes through dried then by the surface of adhesive-coated at the electrode slice base material, with organic solvent by spinning off on the positive and negative plate.
At present, the positive electrode of lithium ion battery directly is coated with and gets in metal collector.That films on the collector consists of positive electrode active materials, conductive agent, polymer (playing bonding effect), it is dissolved in by a certain percentage forms anodal coating sizing-agent in the solvent.The ratio of a material is approximately in filming: positive electrode active materials 90%～97%, and conductive agent (carbon black or electrically conductive graphite and their mixture) 1%～4%, all the other are polymer.The polymer that uses in the positive electrode is generally PVDF (polyvinylidene fluoride.Organic solvent commonly used at present is exactly NMP (a N-methyl pyrrolidone), and it is a kind of colourless transparent liquid, can be miscible with water, be dissolved in ether, and acetone and various organic solvent have the ammonia flavor slightly, and stable chemical performance is not corroded carbon steel, aluminium, and copper is corrosive slightly.It is low to have viscosity, chemical stability and Heat stability is good, the polarity height, volatility is low, can with the unlimited advantage such as miscible of water and many organic solvents.
Summary of the invention:
Technical problem to be solved by this invention just is to improve the lithium ion battery with HMW bonding agent of battery capacity.
For solving the problems of the technologies described above, the present invention has adopted following technical scheme: its positive pole, negative pole and the barrier film between both positive and negative polarity, wherein positive pole comprises: collector and be coated on filming of collection liquid surface, this is filmed and comprises: positive electrode active materials, conductive agent and as the polymer of bonding agent, it is characterized in that: described bonding agent is a polyvinylidene fluoride, and the molecular weight of this polyvinylidene fluoride is 1,200,000.
In the technique scheme, the solvent that described bonding agent adopts is the N-methyl pyrrolidone, and its weight ratio in filming is 2.2%.
In the technique scheme, the weight ratio of consumption in whole filming of described solvent N-methyl pyrrolidone is 50%.
After the present invention adopts technique scheme, when making lithium ion battery anodal, it adopts the bonding agent of HMW, and it can improve content of active substance in the lithium ion battery like this, improved the gram volume of mixed powder, the capacity of final lithium ion battery can improve 3%.Adopt the PVDF of the trade mark 761 at present, its molecular weight is 370,000, and consumption is generally 2.2%. in the anode formula, NMP consumption 50%.
Embodiment:
Lithium ion battery of the present invention comprises positive pole, negative pole and the barrier film between both positive and negative polarity.
Positive pole is directly to be coated with and to form in metal collector among the present invention.That films on the collector consists of: positive electrode active materials, conductive agent, as the polymer of bonding agent are dissolved in it by a certain percentage and form anodal coating sizing-agent in the solvent.This ratio is: positive electrode active materials 90%～97%, conductive agent (carbon black or electrically conductive graphite and their mixture) 1%～4%, all the other are bonding agent, the bonding agent that the present invention adopts is a polyvinylidene fluoride, and the molecular weight of this polyvinylidene fluoride is 1,200,000, and its weight ratio in filming is 2.2%.Solvent is N-methyl pyrrolidone (NMP), and the weight ratio of consumption in whole filming of described solvent N-methyl pyrrolidone is 50%.
Among the present invention, described positive electrode active materials is LiCoO
2
Negative pole of the present invention is directly coating and forming on metal collector.That films on the collector consists of: negative active core-shell material, conductive agent, as the polymer of bonding agent are dissolved in it by a certain percentage and form the negative pole coating sizing-agent in the solvent.This ratio is: negative active core-shell material 90%～97%, and conductive agent (carbon black or electrically conductive graphite and their mixture) 0%～4%, all the other are bonding agent.Then depend on the concrete condition of solvent types and coating machine as for the amount of solvent, the viscosity of general slurry can not wait from 3500 to 30000mPa.s.
Negative active core-shell material can be lithium metal alloy and carbon material section. the example of carbon material section comprises natural or Delanium, glass charcoal, CNT (carbon nano-tube) etc.Required polymer is consistent with positive pole with the scope of the solvent that slurrying is used, and certainly, the polymer in same battery in the positive and negative electrode diaphragm can be different, and the solvent that slurrying is used too.
Barrier film between positive pole and negative pole is a polyolefin film.Usually the thickness of barrier film should be at 5um between the 50um.
Adding electrolyte at last in lithium ion battery gets final product.
Below be one embodiment of the present of invention:
Negative pole: 97% graphite is active material, and 1.5% SBR is a bonding agent, 1.5% CMC.
Anodal: 94.8% cobalt acid lithium, 3% acetylene carbon black is a conductive agent, 2.2% poly-inclined to one side fluorine resin (PVDF) is a bonding agent.
Barrier film: polyolefine material.
Bonding agent: the trade mark is 900 PVDF, and molecular weight is 1,200,000.
Solvent: NMP, its weight ratio in whole filming is 50%.
The bonding agent of this employing of present embodiment HMW is not increasing under its consumption situation like this, and it can improve content of active substance in the lithium ion battery, has improved the gram volume of mixed powder, and the capacity of final lithium ion battery can improve 3%.
Claims (3)
1. the lithium ion battery that has the HMW bonding agent, comprise: positive pole, negative pole and the barrier film between both positive and negative polarity, wherein positive pole comprises: collector and be coated on filming of collection liquid surface, this is filmed and comprises: positive electrode active materials, conductive agent and as the polymer of bonding agent, it is characterized in that: described bonding agent is a polyvinylidene fluoride, and the molecular weight of this polyvinylidene fluoride is 1,200,000.
2. the lithium ion battery with HMW bonding agent according to claim 1 is characterized in that: the solvent that described bonding agent adopts is the N-methyl pyrrolidone, and its weight ratio in filming is 2.2%.
3. the lithium ion battery with HMW bonding agent according to claim 2 is characterized in that: the weight ratio of consumption in whole filming of described solvent N-methyl pyrrolidone is 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106057289A CN102074732A (en) | 2010-12-25 | 2010-12-25 | Lithium ion battery provided with high molecular weight adhesive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106057289A CN102074732A (en) | 2010-12-25 | 2010-12-25 | Lithium ion battery provided with high molecular weight adhesive |
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| CN102074732A true CN102074732A (en) | 2011-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2010106057289A Pending CN102074732A (en) | 2010-12-25 | 2010-12-25 | Lithium ion battery provided with high molecular weight adhesive |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1622366A (en) * | 2003-11-27 | 2005-06-01 | 三星Sdi株式会社 | Cathode for chargeable lithium cell and chargeable lithium cell adopting same |
| CN1881665A (en) * | 2005-07-27 | 2006-12-20 | 松下电器产业株式会社 | Nonaqueous electrolyte secondary battery |
| CN101241988A (en) * | 2008-02-03 | 2008-08-13 | 深圳市比克电池有限公司 | A making method for anode slice of lithium ion battery |
| CN101265397A (en) * | 2008-04-14 | 2008-09-17 | 东莞市迈科新能源有限公司 | Adhesive and lithium ion battery using the same |
| CN101359748A (en) * | 2007-07-30 | 2009-02-04 | 比亚迪股份有限公司 | Lithium-ion secondary cell and manufacturing method therefor |
| CN101651211A (en) * | 2008-08-11 | 2010-02-17 | 比亚迪股份有限公司 | Anode material composition, and anode and battery comprising same |
| CN101859890A (en) * | 2010-06-21 | 2010-10-13 | 惠州市赛能电池有限公司 | Anode material of lithium ion battery |
-
2010
- 2010-12-25 CN CN2010106057289A patent/CN102074732A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1622366A (en) * | 2003-11-27 | 2005-06-01 | 三星Sdi株式会社 | Cathode for chargeable lithium cell and chargeable lithium cell adopting same |
| CN1881665A (en) * | 2005-07-27 | 2006-12-20 | 松下电器产业株式会社 | Nonaqueous electrolyte secondary battery |
| CN101359748A (en) * | 2007-07-30 | 2009-02-04 | 比亚迪股份有限公司 | Lithium-ion secondary cell and manufacturing method therefor |
| CN101241988A (en) * | 2008-02-03 | 2008-08-13 | 深圳市比克电池有限公司 | A making method for anode slice of lithium ion battery |
| CN101265397A (en) * | 2008-04-14 | 2008-09-17 | 东莞市迈科新能源有限公司 | Adhesive and lithium ion battery using the same |
| CN101651211A (en) * | 2008-08-11 | 2010-02-17 | 比亚迪股份有限公司 | Anode material composition, and anode and battery comprising same |
| CN101859890A (en) * | 2010-06-21 | 2010-10-13 | 惠州市赛能电池有限公司 | Anode material of lithium ion battery |
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Application publication date: 20110525 |