CN103258987A - Lithium ion battery and processing method of pole pieces of lithium ion battery - Google Patents
Lithium ion battery and processing method of pole pieces of lithium ion battery Download PDFInfo
- Publication number
- CN103258987A CN103258987A CN2013101710728A CN201310171072A CN103258987A CN 103258987 A CN103258987 A CN 103258987A CN 2013101710728 A CN2013101710728 A CN 2013101710728A CN 201310171072 A CN201310171072 A CN 201310171072A CN 103258987 A CN103258987 A CN 103258987A
- Authority
- CN
- China
- Prior art keywords
- molecular polymer
- organic high
- high molecular
- lithium ion
- ion battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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 provides a lithium ion battery and a processing method of pole pieces of the lithium ion battery. The processing method comprises the following steps of: S1, the step of preparing a glue solution comprises stirring under negative pressure protection, mixing an organic high-molecular polymer and an organic solvent so as to form a glue solution; S2, the step of coating comprises coating the glue solution on the surfaces of the positive pole piece and the negative pole piece through a spray coating, silk screen printing or transfer coating mode so as to form a uniform organic high-molecular polymer coating; and S3: the step of drying comprises baking, thereby obtaining dry positive/negative pole pieces. The organic high-molecular polymer coating is moistened well by utilizing the lipophilicity effect of an organic solvent in electrolyte, thereby improving the contact effect of electrolyte and the pole pieces, enhancing the conduction of lithium ions and active materials, and improving the cycle performance of the lithium ion battery; and the organic high-molecular polymer coating can effectively reduce the contact between surfaces of the pole pieces and gases, and can prevent the heat accumulation on the surfaces of the pole pieces, so that the phenomenon of thermal runaway can be effectively avoided, and the high-temperature-resistant performance of the lithium ion battery is improved.
Description
Technical field
The present invention relates to lithium ion battery, relate in particular to the good safe lithium ion battery of thermal runaway phenomenon generation and the processing method of pole piece thereof also can effectively controlled of a kind of resistance to elevated temperatures.
Background technology
Along with chargeable Ni-Cd(NI-G) battery and Ni-MH(ni-mh) commercial applications of battery, seek lighter, littler and higher energy density becomes the huge challenge that the lithium ion battery exploitation faces.At present, lithium ion battery has been successfully applied to electric bicycle and hybrid vehicle, but the main bottleneck that restricts the lithium ion battery popularization and application at present still is safety issue.
The be short-circuited main cause of thermal runaway of lithium ion battery is that pole piece (positive plate and negative plate) reacts with electrolyte and the heat that produces.The cell positive material that is in Charging state has strong oxidizing property, the cell negative electrode material that is in Charging state simultaneously has strong reducing property, under situations such as abuse, environment such as acupuncture, thermal shock for example, the positive electrode less stable of strong oxidizing property, discharge easily oxygen, and the organic solvents such as carbonic ester in the electrolyte very easily with oxygen reaction, emit a large amount of heat and gas; The heat that produces accelerates positive electrode and decomposes, and produces more oxygen, further promotes the carrying out of more exothermic reactions; Have the activity of negative pole of strong reducing property simultaneously near lithium metal, contact with oxygen and can cause burning and the electrolyte that ignites, barrier film etc.At this problem, Chinese invention patent " a kind of electrodes of lithium-ion batteries processing method " (application number 201210417099.6) has proposed a kind of pole piece processing method, it is handled by carry out the nano-grade inorganics coating at existing electrodes of lithium-ion batteries, utilize the capillarity of nano-grade inorganics particle surface, make pole piece have higher wettability, increase the lithium ion migrating channels, improved the cycle performance of lithium ion battery; Simultaneously, because this nano grade inorganic composition granule has excellent insulation property and heat-proof quality, improved security performance and the resistance to elevated temperatures of lithium ion battery.But there is following defective in it: inorganic nanoparticles is easy to cause particle agglomeration in the glue process and forms bulky grain, causes battery to press to pierce through barrier film in the core process and causes the micro-short circuit phenomenon.This can destroy or reduce the fail safe of lithium ion battery, thereby need do the processing method that further improvement or research and development make new advances.
Summary of the invention
Technical problem to be solved by this invention is: overcome the defective of prior art, provide a kind of cycle performance and resistance to elevated temperatures the good safe lithium ion battery that also can effectively control the thermal runaway phenomenon generation.
Experiment is found, some organic high molecular polymer on pole piece coating and the organic solvent in the electrolyte in the lithium ion battery can interact, thereby improve the effect of the wetting pole piece of electrolyte, make electrolyte better contact with pole piece, and then strengthen the conducting of lithium ion and active material; Meanwhile, because organic high molecular polymer has good plasticity and thermal endurance, can effectively avoid the accumulation of pole piece surface heat, reduced contacting of pole piece surface and gas simultaneously, can effectively avoid the phenomenon of thermal runaway to take place, improve the lithium ion battery resistance to elevated temperatures; Moreover the anti-flammability of organic high molecular polymer also can make the Short Circuit withstand security performance on fire of battery effectively improve.
In view of above experimental result, technical problem of the present invention is solved by following technical scheme:
A kind of lithium ion battery is just comprising/negative plate, and just described/negative plate comprises collector, be covered in the coating layer of active substance of described collection liquid surface and be covered in the organic high molecular polymer coating on described coating layer of active substance surface.
Preferably, described organic high molecular polymer is a kind of in Kynoar, polytetrafluoroethylene, the polyvinyl chloride.
The present invention also provides a kind of processing method of electrodes of lithium-ion batteries, and it comprises the steps:
S1. glue is prepared, with weight ratio be 2.0%～6.0% organic high molecular polymer to add weight ratio be in 90%～95% the organic solvent, under the negative pressure protection, stir, make organic high molecular polymer mix the formation glue with organic solvent;
S2. applying, the mode by spraying, silk screen printing or transfer coated is being coated in described glue just/and the negative plate surface forms uniform organic high molecular polymer coating;
S3. oven dry, baking obtain dry just/negative plate.
Preferably, described organic high molecular polymer is a kind of in Kynoar, polytetrafluoroethylene, the polyvinyl chloride.
Further preferred, described organic solvent is any in N-methyl pyrrolidone, absolute ethyl alcohol, isopropyl alcohol and the ethyl acetate.
The beneficial effect that the present invention is compared with the prior art is:
Oil loving electrolyte portability electrolyte osmosis is to the organic high molecular polymer coating that covers on the pole piece, thus can improve the effect of the wetting pole piece of electrolyte, and then strengthen the conducting of lithium ion and active material.Simultaneously, because organic high molecular polymer has good plasticity and thermal endurance, can effectively avoid the accumulation of pole piece surface heat, reduced contacting of pole piece surface and gas simultaneously, the phenomenon that can effectively control thermal runaway takes place, and has improved the lithium ion battery resistance to elevated temperatures; In addition, the anti-flammability of organic high molecular polymer also can make the Short Circuit withstand security performance on fire of battery effectively improve.
Description of drawings
Fig. 1 is the sectional structure schematic diagram of the lithium ion pole piece of prior art.
Fig. 2 is the sectional structure schematic diagram of the lithium ion pole piece of one embodiment of the invention.
Embodiment
Contrast accompanying drawing and the present invention is explained in detail in conjunction with preferred embodiment below.
As shown in Figure 2, the lithium ion battery of present embodiment just/negative plate comprises collector 1, be covered in the coating layer of active substance 2 of described collection liquid surface and be covered in described coating layer of active substance surface, organic high molecular polymer coating 3 uniformly.As preferable way, described organic high molecular polymer is preferably Kynoar PVDF, and the thickness of described Kynoar PVDF coating is 12 μ m; Described collector 1 is aluminium foil or Copper Foil.Described active material is used for Electolyte-absorptive and forms the active material storage liquid layer that contains electrolyte.
Organic high molecular polymer is generally poor thermal conductivity or thermal insulation material, and good heat resistance, therefore can effectively completely cut off the contact between the positive and negative plate when the thermal contraction of battery heating barrier film.Simultaneously; organic high molecular polymer has good viscosity, can be attached to pole piece surface difficult drop-off, and it is tight relatively to interweave; can intercept contacting of gas and pole piece surface preferably, protection pole piece SEI(solid electrolyte interface solid electrolyte interface) effect such as film.Present embodiment just/negative plate is because the surface is coated with the organic high molecular polymer coating, so just can well isolate/negative plate, prevents the pole piece short circuit, and isolated gas and can not cause on fire.Can guarantee that also organic high molecular polymer can just isolate/negative plate effectively even occur barrier film thermal contraction phenomenon between pole piece, avoid both to contact.And organic high molecular polymer can not form particulate material, can not cause that barrier film pierces through and the micro-short circuit phenomenon that causes.
Electrolyte in the electrolyte of inside lithium ion cell is dissolved in the organic solvents such as diethyl carbonate DEC or dimethyl carbonate DMC, and diethyl carbonate DEC or dimethyl carbonate DMC etc. are the primary solvents of electrolyte, this organic solvent with coating mutually in the wetting process, electrolyte also contacts better with pole piece thereupon.For example Kynoar PVDF is chain, and structural formula is-(C2H2F2) n-, on pole piece interlaced formation netted, can be effectively affine with electrolyte solvent, improved the better wetting pole piece of electrolyte.
In addition, described organic high molecular polymer also can select to use polytetrafluoroethylene PTFE or polyvinylchloride, and the thickness of coating also can be selected arbitrarily to use at 8～15 μ m according to actual conditions, all can reach identical technique effect.
Pole piece (positive plate or negative plate) structure before handling is shown in Fig. 1, and collector 1 is aluminium foil or Copper Foil, and its surface is provided with coating layer of active substance 2, forms the active material storage liquid layer that contains electrolyte for Electolyte-absorptive.Pole piece after the processing (positive plate or negative plate) comprises collector 1 as shown in Figure 2, is covered in the coating layer of active substance 2 of described collection liquid surface, and the organic high molecular polymer coating 3 that is covered in described coating layer of active substance 2 surfaces.
The processing method of the electrodes of lithium-ion batteries of present embodiment comprises:
The glue preparation process, with weight ratio be 3.5% organic high molecular polymer to add weight ratio be in 90%～95% the organic solvent, under the negative pressure protection, stirred 3～8 hours, make organic high molecular polymer mix the formation glue with organic solvent; Wherein, described organic solvent is a kind of among water-base cement NMP, absolute ethyl alcohol C2H5OH, isopropyl alcohol C3H8OH and the ethyl acetate CH3COOC2H5; Described organic high molecular polymer is a kind of in Kynoar PVDF, polytetrafluoroethylene PTFE, the polyvinylchloride.
Electrolyte in the inside lithium ion cell electrolyte is dissolved in the organic solvents such as diethyl carbonate DEC or dimethyl carbonate DMC, and diethyl carbonate DEC or dimethyl carbonate DMC etc. are the primary solvents of electrolyte, this organic solvent with coating mutually in the wetting process, electrolyte also contacts better with pole piece thereupon.For example Kynoar PVDF is chain, and structural formula is-(C2H2F2) n-, on pole piece interlaced formation netted, can be effectively affine with electrolyte solvent, improved the better wetting pole piece of electrolyte.
Coating step, the mode by spraying, silk screen printing or transfer coated be coated in described glue just/and the negative plate surface forms uniform organic high molecular polymer coating; The thickness of described coating is 12 μ m.In addition, it is 8～15 μ m that those skilled in the art can according to circumstances select coating layer thickness, also can reach same technique effect.
Baking step, baking obtain dry just/negative plate, the temperature of baking is 60～110 ℃, the time is 3～5min, obtain dry just/negative plate.
Embodiment 3
The difference of present embodiment and embodiment 2 is that the weight ratio of wherein organic high molecular polymer is 2.0%.
Embodiment 4
The difference of present embodiment and embodiment 2 is that the weight ratio of wherein organic high molecular polymer is 3.0%.
Embodiment 5
The difference of present embodiment and embodiment 2 is that the weight ratio of wherein organic high molecular polymer is 4.0%.
Embodiment 6
The difference of present embodiment and embodiment 2 is that the weight ratio of wherein organic high molecular polymer is 5.0%.
Embodiment 7
The difference of present embodiment and embodiment 2 is that the weight ratio of wherein organic high molecular polymer is 6.0%.
Processing method via above each embodiment is just resulting/negative plate, and it is good and can effectively control the safe lithium ion battery that thermal runaway phenomenon takes place all can to generate resistance to elevated temperatures.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, make some being equal to substitute or obvious modification, and performance or purposes are identical, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. a lithium ion battery is just comprising/negative plate, it is characterized in that: just described/negative plate comprises collector, be covered in the coating layer of active substance of described collection liquid surface and be covered in the organic high molecular polymer coating on described coating layer of active substance surface.
2. lithium ion battery as claimed in claim 1, it is characterized in that: the thickness of described organic high molecular polymer coating is 8～15 μ m.
3. lithium ion battery as claimed in claim 2, it is characterized in that: the thickness of described organic high molecular polymer coating is 12 μ m.
4. as the arbitrary described lithium ion battery of claim 1-3, it is characterized in that: described organic high molecular polymer is Kynoar, polytetrafluoroethylene or polyvinyl chloride.
5. the processing method of an electrodes of lithium-ion batteries is characterized in that comprising the steps:
S1. glue is prepared, with weight ratio be 2.0%～6.0% organic high molecular polymer to add weight ratio be in 90%～95% the organic solvent, under the negative pressure protection, stir, make organic high molecular polymer mix the formation glue with organic solvent;
S2. applying, the mode by spraying, silk screen printing or transfer coated is being coated in described glue just/and the negative plate surface forms uniform organic high molecular polymer coating;
S3. oven dry, baking obtain dry just/negative plate.
6. the processing method of electrodes of lithium-ion batteries as claimed in claim 5, it is characterized in that: the weight ratio of described organic high molecular polymer is 3.5%.
7. the processing method of electrodes of lithium-ion batteries as claimed in claim 5 is characterized in that: described organic high molecular polymer is a kind of in Kynoar, polytetrafluoroethylene, the polyvinyl chloride.
8. the processing method of electrodes of lithium-ion batteries as claimed in claim 5, it is characterized in that: the temperature of described baking is 60～110 ℃.
9. as the processing method of the arbitrary described electrodes of lithium-ion batteries of claim 5-8, it is characterized in that: described organic solvent is any in N-methyl pyrrolidone, absolute ethyl alcohol, isopropyl alcohol and the ethyl acetate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310171072.8A CN103258987B (en) | 2013-05-10 | 2013-05-10 | A kind of lithium ion battery and the processing method of pole piece thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310171072.8A CN103258987B (en) | 2013-05-10 | 2013-05-10 | A kind of lithium ion battery and the processing method of pole piece thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103258987A true CN103258987A (en) | 2013-08-21 |
| CN103258987B CN103258987B (en) | 2016-09-07 |
Family
ID=48962790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310171072.8A Active CN103258987B (en) | 2013-05-10 | 2013-05-10 | A kind of lithium ion battery and the processing method of pole piece thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103258987B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075101A (en) * | 2017-12-11 | 2018-05-25 | 中航锂电技术研究院有限公司 | Anode plate for lithium ionic cell with Thermal shutdown coating |
| CN110487665A (en) * | 2019-08-23 | 2019-11-22 | 深圳市比克动力电池有限公司 | A kind of wellability detection method of pole piece |
| CN110707263A (en) * | 2019-09-02 | 2020-01-17 | 深圳市劢全新材料科技有限责任公司 | Coating method of battery diaphragm |
| CN111933891A (en) * | 2020-07-27 | 2020-11-13 | 海口安博尔能源技术开发有限公司 | Battery pole piece and processing method thereof |
| CN112687839A (en) * | 2020-12-24 | 2021-04-20 | 惠州亿纬锂能股份有限公司 | Pole piece, preparation method thereof and lithium ion battery |
| CN114883570A (en) * | 2022-07-07 | 2022-08-09 | 中国长江三峡集团有限公司 | Modified electrode body, preparation method and application thereof, and lithium ion battery |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1725547A (en) * | 2004-07-21 | 2006-01-25 | 上海比亚迪有限公司 | Lithium ion secondary battery |
| CN1875504A (en) * | 2003-11-05 | 2006-12-06 | 株式会社Lg化学 | Functional polymer film-coated electrode and electrochemical device using the same |
| CN101894971A (en) * | 2010-05-21 | 2010-11-24 | 宁德新能源科技有限公司 | Lithium-ion secondary battery |
| CN102569881A (en) * | 2012-01-04 | 2012-07-11 | 宁德新能源科技有限公司 | Lithium ion battery |
| WO2013002608A2 (en) * | 2011-06-30 | 2013-01-03 | 주식회사 엘지화학 | Electrode assembly for secondary battery and lithium secondary battery comprising same |
| CN203242700U (en) * | 2013-05-10 | 2013-10-16 | 深圳市量能科技有限公司 | Lithium ion battery and pole piece thereof |
-
2013
- 2013-05-10 CN CN201310171072.8A patent/CN103258987B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1875504A (en) * | 2003-11-05 | 2006-12-06 | 株式会社Lg化学 | Functional polymer film-coated electrode and electrochemical device using the same |
| CN1725547A (en) * | 2004-07-21 | 2006-01-25 | 上海比亚迪有限公司 | Lithium ion secondary battery |
| CN101894971A (en) * | 2010-05-21 | 2010-11-24 | 宁德新能源科技有限公司 | Lithium-ion secondary battery |
| WO2013002608A2 (en) * | 2011-06-30 | 2013-01-03 | 주식회사 엘지화학 | Electrode assembly for secondary battery and lithium secondary battery comprising same |
| CN102569881A (en) * | 2012-01-04 | 2012-07-11 | 宁德新能源科技有限公司 | Lithium ion battery |
| CN203242700U (en) * | 2013-05-10 | 2013-10-16 | 深圳市量能科技有限公司 | Lithium ion battery and pole piece thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075101A (en) * | 2017-12-11 | 2018-05-25 | 中航锂电技术研究院有限公司 | Anode plate for lithium ionic cell with Thermal shutdown coating |
| CN110487665A (en) * | 2019-08-23 | 2019-11-22 | 深圳市比克动力电池有限公司 | A kind of wellability detection method of pole piece |
| CN110707263A (en) * | 2019-09-02 | 2020-01-17 | 深圳市劢全新材料科技有限责任公司 | Coating method of battery diaphragm |
| CN111933891A (en) * | 2020-07-27 | 2020-11-13 | 海口安博尔能源技术开发有限公司 | Battery pole piece and processing method thereof |
| CN112687839A (en) * | 2020-12-24 | 2021-04-20 | 惠州亿纬锂能股份有限公司 | Pole piece, preparation method thereof and lithium ion battery |
| CN114883570A (en) * | 2022-07-07 | 2022-08-09 | 中国长江三峡集团有限公司 | Modified electrode body, preparation method and application thereof, and lithium ion battery |
| CN114883570B (en) * | 2022-07-07 | 2022-09-30 | 中国长江三峡集团有限公司 | Modified electrode body, preparation method and application thereof, and lithium ion battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103258987B (en) | 2016-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101499530B (en) | Multi-multiplying power charging-discharging lithium ion battery and method for producing the same | |
| CN105470515B (en) | A kind of safe lithium ion power battery anode and the lithium ion battery containing the positive pole | |
| TWI418077B (en) | Lithium secondary battery | |
| CN103258987A (en) | Lithium ion battery and processing method of pole pieces of lithium ion battery | |
| CN109755448A (en) | A kind of lithium battery diaphragm and preparation method thereof with benefit lithium coating | |
| CN105140450A (en) | Lithium ion battery composite separator, preparation method thereof, and lithium ion battery | |
| CN109449414A (en) | A kind of anode composite material of lithium ion battery and the all-solid-state battery containing the material | |
| CN105811007A (en) | Electrolyte gel, lithium-sulfur battery and method for preparing electrolyte gel | |
| CN202633452U (en) | Lithium ion battery structure | |
| CN104701588A (en) | High-compactness solid electrolyte-based novel lithium air battery | |
| CN103904291A (en) | Aqueous lithium ion battery electrode, preparation method of electrode and aqueous lithium ion battery | |
| CN104393290A (en) | Aluminum-ion battery using MoS2 as positive electrode material and preparation method of battery | |
| CN101752549A (en) | Lithium polymer battery and method for producing positive pole plate for same | |
| CN103165840B (en) | Electrode assembly of lithium secondary battery | |
| CN102832378A (en) | Carbon anode material for lithium ion battery and preparation method for carbon anode material | |
| US20220037636A1 (en) | Lithium-manganese dioxide primary battary and preparation thereof | |
| CN105280889B (en) | A kind of lithium ion battery silicon composite cathode material and preparation method thereof | |
| CN106450435A (en) | Ternary lithium ion battery and preparation method thereof | |
| CN113497267A (en) | Solid metal lithium battery and preparation method thereof | |
| CN108110324A (en) | A kind of preparation method of solid lithium ion battery | |
| CN103956516B (en) | A kind of lithium ion power battery electrolyte | |
| US11217826B2 (en) | Methods of making sulfide-impregnated solid-state battery | |
| CN103515608A (en) | Graphene/sulfur composite material and preparation method thereof, battery positive electrode and preparation method thereof, and battery | |
| CN202434660U (en) | Pole core of lithium ion battery and lithium ion battery | |
| Liu et al. | Fiber-supported alumina separator for achieving high rate of high-temperature lithium-ion batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |