WO2016110134A1 - 一种基于复合正、负极材料的新型电池电容 - Google Patents
一种基于复合正、负极材料的新型电池电容 Download PDFInfo
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- WO2016110134A1 WO2016110134A1 PCT/CN2015/091534 CN2015091534W WO2016110134A1 WO 2016110134 A1 WO2016110134 A1 WO 2016110134A1 CN 2015091534 W CN2015091534 W CN 2015091534W WO 2016110134 A1 WO2016110134 A1 WO 2016110134A1
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- Prior art keywords
- composite
- lithium
- activated carbon
- battery capacitor
- positive
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- 239000002131 composite material Substances 0.000 title claims abstract description 42
- 239000003990 capacitor Substances 0.000 title claims abstract description 35
- 239000010405 anode material Substances 0.000 title claims abstract description 5
- 239000010406 cathode material Substances 0.000 title abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 131
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 36
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 239000006258 conductive agent Substances 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003792 electrolyte Substances 0.000 claims abstract description 15
- 239000011888 foil Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
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- -1 polytetrafluoroethylene Polymers 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 29
- 239000000243 solution Substances 0.000 claims description 28
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical group [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 23
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- 239000004743 Polypropylene Substances 0.000 claims description 22
- 229920001155 polypropylene Polymers 0.000 claims description 22
- HPTYUNKZVDYXLP-UHFFFAOYSA-N aluminum;trihydroxy(trihydroxysilyloxy)silane;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O[Si](O)(O)O HPTYUNKZVDYXLP-UHFFFAOYSA-N 0.000 claims description 19
- 229910052621 halloysite Inorganic materials 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 18
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- 241001330002 Bambuseae Species 0.000 claims description 15
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- 229920002678 cellulose Polymers 0.000 claims description 15
- 239000001913 cellulose Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 15
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000007822 coupling agent Substances 0.000 claims description 12
- 229910021389 graphene Inorganic materials 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- 150000004645 aluminates Chemical class 0.000 claims description 10
- 239000011267 electrode slurry Substances 0.000 claims description 10
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- 239000002033 PVDF binder Substances 0.000 claims description 8
- 239000002114 nanocomposite Substances 0.000 claims description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 238000009775 high-speed stirring Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000007774 positive electrode material Substances 0.000 claims description 7
- 239000002243 precursor Substances 0.000 claims description 7
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical group CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000002041 carbon nanotube Substances 0.000 claims description 5
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 5
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 5
- 239000007773 negative electrode material Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 4
- 244000060011 Cocos nucifera Species 0.000 claims description 4
- AEDAWHHRIHMZAR-UHFFFAOYSA-N [O-][N+](=O)CN1CCCC1=O Chemical compound [O-][N+](=O)CN1CCCC1=O AEDAWHHRIHMZAR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000011331 needle coke Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 2
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical group [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 claims description 2
- 229910001486 lithium perchlorate Inorganic materials 0.000 claims description 2
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 claims description 2
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 claims description 2
- 239000002000 Electrolyte additive Substances 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- MQYNNGIYNLJMAP-UHFFFAOYSA-M lithium;fluoromethanesulfonate Chemical compound [Li+].[O-]S(=O)(=O)CF MQYNNGIYNLJMAP-UHFFFAOYSA-M 0.000 claims 1
- 239000011159 matrix material Substances 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- OBAJXDYVZBHCGT-UHFFFAOYSA-N tris(pentafluorophenyl)borane Chemical compound FC1=C(F)C(F)=C(F)C(F)=C1B(C=1C(=C(F)C(F)=C(F)C=1F)F)C1=C(F)C(F)=C(F)C(F)=C1F OBAJXDYVZBHCGT-UHFFFAOYSA-N 0.000 claims 1
- 239000012528 membrane Substances 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 abstract description 3
- 238000004146 energy storage Methods 0.000 abstract description 3
- 239000007772 electrode material Substances 0.000 abstract description 2
- YTXFOSVCYYHADT-UHFFFAOYSA-N 2,1,3-benzoxadiazol-5-ol Chemical compound C1=C(O)C=CC2=NON=C21 YTXFOSVCYYHADT-UHFFFAOYSA-N 0.000 abstract 3
- 239000007767 bonding agent Substances 0.000 abstract 1
- 230000014759 maintenance of location Effects 0.000 description 4
- 229910013870 LiPF 6 Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
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- OTYYBJNSLLBAGE-UHFFFAOYSA-N CN1C(CCC1)=O.[N] Chemical compound CN1C(CCC1)=O.[N] OTYYBJNSLLBAGE-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
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- 229910002804 graphite Inorganic materials 0.000 description 2
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- 238000001179 sorption measurement Methods 0.000 description 2
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
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- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 206010016766 flatulence Diseases 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- MCVFFRWZNYZUIJ-UHFFFAOYSA-M lithium;trifluoromethanesulfonate Chemical compound [Li+].[O-]S(=O)(=O)C(F)(F)F MCVFFRWZNYZUIJ-UHFFFAOYSA-M 0.000 description 1
- LBSANEJBGMCTBH-UHFFFAOYSA-N manganate Chemical compound [O-][Mn]([O-])(=O)=O LBSANEJBGMCTBH-UHFFFAOYSA-N 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/04—Hybrid capacitors
- H01G11/06—Hybrid capacitors with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/46—Metal oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/50—Electrodes characterised by their material specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
Definitions
- the invention relates to the field of new energy storage devices, and particularly relates to a novel battery capacitor based on composite positive and negative materials.
- Lithium titanate (Li 4 Ti 5 O 12 ) has a lithium-rich spinel structure. Compared with the graphite negative electrode, the theoretical capacity is lower (170 mAh/g) and the voltage is higher (1.5 V vs Li), both of which undoubtedly reduce the specific energy of lithium titanate, but a series of advantages other than this It has become an attractive candidate anode material. Firstly, the shape variable is very small during the cycle, which makes Li 4 Ti 5 O 12 have good cycle stability; in addition, there is no electrolyte decomposition and no SEI film is formed; it has excellent rate performance, low temperature charge and discharge performance and heat. stability.
- lithium titanate/lithium manganate system Compared with the existing graphite/lithium cobalt oxide system in the market, the advantages of lithium titanate/lithium manganate system include: excellent and nearly perfect safety, excellent cycle life, fast charge and discharge, and lithium manganate. Overall cost advantage, etc.
- An object of the present invention is to solve the above problems and to provide a novel battery capacitor based on composite positive and negative materials.
- the capacitor can significantly improve power performance and cycle life while maintaining high specific energy and high safety.
- the present invention adopts the following technical solutions: a novel battery capacitor based on composite positive and negative materials, wherein the battery capacitor includes a positive electrode, a negative electrode, a conductive agent, a binder, an electrolyte, and a separator. And corroding aluminum foil, the battery capacitor is a composite material of lithium manganate and activated carbon as a positive electrode, and a composite material of lithium titanate and activated carbon is a negative electrode.
- the lithium manganate is lithium manganate coated or doped with one or more of carbon, metal, metal oxide, and the lithium titanate is doped and coated with carbon or graphene and a ball Lithium titanate treated.
- the lithium manganate is a nano-composite lithium manganate synthesized by mixing a doping element with a nano metal oxide as a precursor, the lithium titanate being a nano-composite lithium titanate, and the nano-composite lithium manganate and the nano composite
- the lithium titanate has a particle diameter of less than 500 nm.
- the activated carbon is activated carbon having a coconut shell or a needle coke as a precursor, and the activated carbon is used after surface modification treatment, and the surface modification treatment method is: a silane coupling agent having a concentration of 5-10 wt%
- the anhydrous ethanol solution is mixed with activated carbon for 30-50 min, then added with a concentration of 8-15 wt% of the aluminate coupling agent in absolute ethanol solution for 30-50 min, filtered, and the filtrate is dried at 70-80 ° C.
- the amount of silane coupling agent is 0.5-1% of the weight of activated carbon
- the amount of aluminate coupling agent is 1-1.5% of the weight of activated carbon.
- the inventors discovered that the first surface treatment of activated carbon is first carried out by using a silane coupling agent. After the silane coupling agent is mixed into the activated carbon, it can effectively penetrate into the gap between the activated carbon particles, so that the activated carbon particles are relatively isolated. It can effectively improve the dispersibility of activated carbon, and then the second surface treatment of the treated activated carbon by adding an aluminate coupling agent, which can effectively solve the problem of agglomeration of activated carbon and make the aluminate coupling agent effective. The activated carbon is further prevented from agglomeration of the activated carbon. Due to the treatment of the coupling agent, the oleophilic group of the activated carbon is increased, and the components such as the binder are more uniformly mixed, and the obtained positive and negative electrode materials are uniformly distributed and the performance is stable.
- the conductive agent is conductive carbon black, carbon nanotube or single layer graphene
- the binder is polyvinylidene fluoride or polytetrafluoroethylene.
- the solute of the electrolyte is at least one of lithium perchlorate, lithium hexafluoroarsenate, lithium tetrafluoroborate, lithium hexafluorophosphate, lithium trifluoromethanesulfonate, and tetraethylammonium tetrafluoroborate.
- the solvent of the electrolyte is one or more of acetonitrile, ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, and the additive of the electrolyte is tris(pentafluorophenyl) One or more of boron, trimethyl phosphate, triphenyl phosphate, and diazophenone.
- the membrane is a polypropylene membrane, a polyethylene membrane or a composite membrane based on polypropylene.
- the polypropylene-based composite separator is prepared from 80-85 wt% of polypropylene, 10-15 wt% of natural cellulose pulp, and 3-5 wt% of halloysite powder. 0.5-1.5 wt% of a silane coupling agent; the above materials are uniformly mixed, and then the polypropylene-based composite separator is obtained by a dry process.
- the natural cellulose slurry is prepared as follows:
- the solid filtrate is beaten and concentrated by a beater to obtain a natural cellulose slurry having a solid content of 60 to 70% by weight.
- the natural cellulose slurry prepared by the above method contains a large amount of natural cellulose, and the natural cellulose has the characteristics of good hygroscopicity and good thermal stability, and a small amount of natural cellulose combined with polypropylene can improve polypropylene. Hygroscopicity and thermal stability enhance the absorption retention of the electrolyte to improve the rate performance and cycle performance of the product.
- natural cellulose and polypropylene are combined to produce cross-linking, which also enhances the tensile strength and anti-sting strength of the separator to some extent.
- Eloline powder is a tubular material with a nanometer-sized hollow pipe, which has good adsorption performance, and is compounded in the separator to further enhance the hygroscopicity of the separator, and the halloysite powder can also improve the thermal stability of the separator. And mechanical strength.
- the silane coupling agent is capable of making the halloysite powder and polypropylene more compatible.
- the halloysite powder is pretreated:
- the dried solid powder is calcined, and the pretreatment of the halloysite powder is completed after calcination; wherein the calcination temperature is 500-600 ° C, and the calcination time is 4 hours.
- the halloysite powder removes the crystal water inside its own structure, and its adsorption performance and high temperature resistance are greatly improved.
- the manufacturing of the battery capacitor comprises the following steps:
- the electrode is matched according to the mass ratio of the positive and negative electrode active materials 1-2:1, and the positive and negative electrode sheets and the separator are made of "Z" type laminated sheets, and the product is obtained after drying and packaging. .
- the invention has the following beneficial effects:
- the beneficial effect of the composite electrode using lithium manganate and lithium titanate in the invention is that the introduction of activated carbon greatly improves the electrical conductivity of the electrode material and the characteristic of partial energy storage, which significantly improves the rate performance of the product and satisfies the high current. Need for charging and discharging;
- composite conductive agents can better build a conductive network to further increase power density.
- Polypropylene-based composite separators have better hygroscopicity, tensile strength, anti-sting strength and high temperature resistance. It is beneficial to improve the rate performance, cycle performance and service life of the product.
- FIG. 1 is a schematic view showing the structure of an electric cell of the present invention.
- the materials used in the examples of the present invention are all raw materials commonly used in the art, and the methods used in the examples are all conventional methods in the art.
- Fig. 1 is a schematic view of a simplified battery core, and only the configuration of the present invention is schematically illustrated.
- the novel battery capacitor shown in FIG. 1 includes a positive electrode tab 1 and a negative electrode tab 2. Both sides of the positive and negative electrode sheets were uniformly coated with a slurry of lithium manganate (lithium titanate), activated carbon, a binder, and a conductive agent.
- the separator 3 completely encloses and completely isolates the positive and negative pole pieces in the form of a "Z", and the electrolyte 4 is filled in the structure of the battery capacitor to infiltrate the positive and negative electrodes and the separator.
- a novel battery capacitor based on composite positive and negative materials is as follows:
- the electrolyte was made of 1M LiPF 6 and 0.5M SBP as a solute, and EC, DEC, DMC in a volume ratio of 1:1:1 was used as a solvent.
- the positive and negative electrode pieces with a certain thickness of 1.5:1 are matched with the positive and negative electrode pieces, and the positive and negative electrode pieces are separated into a battery core by a diaphragm, vacuum dried for 24 hours, and the solution is sealed in the glove box.
- the formation and secondary encapsulation were carried out to obtain a product.
- both the lithium manganate and the lithium titanate are subjected to an amorphous carbon coating treatment, wherein the coating amount of the amorphous carbon is 3 wt%. And the particle size of lithium manganate and lithium titanate is less than 500 nm.
- a novel battery capacitor based on composite positive and negative materials is as follows:
- a composite separator based on polypropylene was used.
- the electrolyte used 1M LiPF 6 and 0.5 M SBP as the solute, and EC, DEC, and DMC in a volume ratio of 1:1:1 were used as the solvent.
- a positive and negative electrode piece with a certain thickness of 2:1 is matched with the positive and negative electrode pieces, and the positive and negative electrode pieces are separated into a battery core by a diaphragm, vacuum-dried for 24 hours, and the solution is sealed in the glove box.
- the formation and secondary encapsulation were carried out to obtain a product.
- the lithium manganate and lithium titanate are doped with 10 wt% of graphene, and the lithium manganate and lithium titanate have a particle diameter of less than 500 nm.
- the polypropylene-based composite separator is prepared from 83 wt% of polypropylene, 12 wt% of natural cellulose pulp, 4 wt% of halloysite powder, and 1 wt% of KH560 silane coupling agent; After the materials are uniformly mixed, the polypropylene-based composite separator is obtained by a dry process.
- a novel battery capacitor based on composite positive and negative materials is as follows:
- a composite separator based on polypropylene was used, and the electrolyte was made of 1M LiPF 6 and 0.5 M SBP as a solute, and EC, DEC, and DMC in a volume ratio of 1:1:1 was used as a solvent.
- the positive and negative electrode pieces are matched to a certain thickness by a ratio of 1:1 positive and negative active material ratios, and the positive and negative pole pieces are separated into a battery core by a diaphragm, vacuum dried for 24 hours, and the solution is sealed in a glove box.
- the formation and secondary encapsulation were carried out to obtain a product.
- both the lithium manganate and the lithium titanate are doped with 25 wt% of graphene.
- the particle size of lithium manganate and lithium titanate is less than 500 nm.
- the polypropylene-based composite separator is prepared from 85 wt% of polypropylene, 10 wt% of natural cellulose pulp, 3.5 wt% of halloysite powder, and 1.5 wt% of KH550 silane coupling agent. The above-mentioned materials are uniformly mixed, and then the polypropylene-based composite separator is obtained by a dry process.
- Example 2-3 the natural cellulose slurry was prepared as follows:
- the halloysite powder is pretreated:
- the dried solid powder is calcined, and the pretreatment of the halloysite powder is completed after calcination; wherein the calcination temperature is 550 ° C, and the calcination time is 4 hours.
- the activated carbon is activated carbon with a coconut shell as a precursor, and the activated carbon is used after surface modification treatment, and the surface modification treatment method is: the silane coupling agent having a concentration of 7.5 wt% is anhydrous.
- the ethanol solution was mixed with activated carbon for 40 min, and then an aluminate coupling agent absolute ethanol having a concentration of 12 wt% was added.
- the solution was mixed for 40 min, filtered, and the filtrate was dried at 75 ° C for 4.5 h and then activated at 102 ° C for 1.5 h.
- the amount of the silane coupling agent was 0.75% by weight of the activated carbon, and the amount of the aluminate coupling agent was 1.25 by weight of the activated carbon. %.
- the activated carbon is activated carbon with a needle coke as a precursor, and the activated carbon is used after surface modification treatment, and the surface modification treatment method is: the silane coupling agent having a concentration of 5 wt% is anhydrous.
- the ethanol solution was mixed with activated carbon for 30 min, then added with a concentration of 8 wt% aluminate coupling agent in absolute ethanol solution for 30 min, filtered, and the filtrate was dried at 80 ° C for 4 h and then activated at 105 ° C for 1 h.
- the amount of the coupling agent is 0.5% by weight of the activated carbon, and the amount of the aluminate coupling agent is 1% by weight of the activated carbon.
- the products of Examples 1-3 were subjected to a constant current charge and discharge test at 0.5 C.
- the specific capacity of the battery capacitor of Example 1 was 60 mAh/g, and the capacity retention rate was 80% after 20,000 cycles;
- the specific capacity of the battery capacitor was 55 mAh/g, and the capacity retention rate was 83% after 20,000 cycles;
- the specific capacity of the battery capacitor of Example 3 was 51 mAh/g, and after 20,000 cycles, the capacity retention rate was 82%.
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Abstract
本发明涉及新能源储能器件领域,具体涉及一种基于复合正、负极材料的新型电池电容。所述电池电容包括正极、负极、导电剂、粘结剂、电解液、隔膜和腐蚀铝箔片,所述电池电容以锰酸锂和活性炭的复合材料为正极,以钛酸锂和活性炭的复合材料为负极。本发明采用锰酸锂和钛酸锂的复合电极的有益效果是,通过活性炭的引入大大提升电极材料的导电性能和部分电容储能的特性,显著改善了产品的倍率性能,满足了大电流充放的需要;对锰酸锂和钛酸锂的掺杂包覆处理可以解决产气、溶解等问题,提高了循环寿命;复合导电剂的使用可以更好的构建导电网络,进一步提升功率密度。
Description
本发明涉及新能源储能器件领域,具体涉及一种基于复合正、负极材料的新型电池电容。
钛酸锂(Li4Ti5O12)具有富锂的尖晶石结构。和石墨负极相比,理论容量较低(170mAh/g),电压较高(1.5Vvs Li),这两点无疑都降低了钛酸锂的比能量,但是除此之外的一系列优点使其成为了一种极具吸引力的候选负极材料。首先在循环过程中形变量十分地小,这让Li4Ti5O12有着很好的循环稳定性;此外,没有电解质分解因而没有SEI膜生成;具有优良的倍率性能、低温充放电性能以及热稳定性。
相较于市场现有的石墨/钴酸锂体系,钛酸锂/锰酸锂体系的优势包括:卓越而近乎完美的安全性、优秀的循环寿命、可以实现快速充放电、锰酸锂具备的整体成本优势等。
但是钛酸锂和锰酸锂的电子电导率都比较低,另外在多次充放电循环时,存在有胀气、锰在电解质溶液中溶解等缺陷,因而大大制约了这种体系的功率性能和循环寿命,难以满足电动乘用车等绿色新能源领域快速充放、长期使用的需要。
发明内容
本发明的目的是为了解决上述问题,提供一种基于复合正、负极材料的新型电池电容。该电容器能在保持高比能量、高安全性的基础上显著提升功率性能和循环寿命。
为了达到上述发明目的,本发明采用以下技术方案:一种基于复合正、负极材料的新型电池电容,其特征在于,所述电池电容包括正极、负极、导电剂、粘结剂、电解液、隔膜和腐蚀铝箔片,所述电池电容以锰酸锂和活性炭的复合材料为正极,以钛酸锂和活性炭的复合材料为负极。
作为优选,所述锰酸锂为经过碳、金属、金属氧化物中的一种或几种包覆或掺杂的锰酸锂,钛酸锂为经过碳或者石墨烯掺杂和包覆以及球化处理的钛酸锂。
作为优选,所述锰酸锂为以纳米金属氧化物为前驱体混合掺杂元素合成的纳米复合锰酸锂,所述钛酸锂为纳米复合钛酸锂,且纳米复合锰酸锂和纳米复合钛酸锂的粒径小于500nm。
作为优选,所述活性炭是以椰壳或针状焦为前驱体的活性炭,所述活性炭表面改性处理后使用,表面改性处理的方法为:将浓度为5-10wt%的硅烷偶联剂无水乙醇溶液与活性炭混合30-50min,然后再加入浓度为8-15wt%的铝酸酯偶联剂无水乙醇溶液在混合30-50min,过滤,过滤物在70-80℃下干燥4-5h,再在100℃-105℃下活化1-2h,硅烷偶联剂用量为活性炭重量的0.5-1%,铝酸酯偶联剂用量为活性炭重量的1-1.5%。
以椰壳或针状焦为前驱体的活性炭,孔隙适中,用于正、负极活性物质的性能较佳。
发明人通过长期的实验研究后发现,先通过使用硅烷偶联剂对活性炭进行第一次表面处理,硅烷偶联剂混入活性炭后,能有效渗入活性炭颗粒之间的间隙,使活性炭颗粒间相对隔离,能有效的提高活性炭的分散性,然后再通过添加铝酸酯偶联剂对处理过的活性炭进行第二次表面处理,这样能有效解决活性炭团聚的问题,使铝酸酯偶联剂有效的包裹活性炭,进一步的防止了活性炭的团聚,由于偶联剂的处理,活性炭亲油基团增加,与粘结剂等成分混合的更均匀,所得正、负极材料成分分布均匀,性能稳定。
作为优选,所述导电剂为导电碳黑、碳纳米管或单层石墨烯,所述的粘结剂为聚偏氟乙烯或聚四氟乙烯。
作为优选,所述电解液的溶质为高氯酸锂、六氟砷酸锂、四氟硼酸锂、六氟磷酸锂、三氟甲基磺酸锂、四氟硼酸四乙基铵盐中的至少一种,电解液的溶剂为乙腈、碳酸乙烯酯、碳酸丙烯酯、碳酸二甲酯、碳酸二乙酯、碳酸甲乙酯中的一种或者几种,电解液的添加剂为三(五氟化苯基)硼、磷酸三甲酯、磷酸三苯酯、二氮苯基酮中的一种或几种。
作为优选,所述隔膜为聚丙烯隔膜、聚乙烯隔膜或者以聚丙烯为基体的复合材料隔膜。
作为优选,所述以聚丙烯为基体的复合材料隔膜由以下物质制备而成:80-85wt%的聚丙烯,10-15wt%的天然纤维素浆料,3-5wt%的埃洛石粉,
0.5-1.5wt%的硅烷偶联剂;将上述各物质混合均匀后通过干法工艺制得所述以聚丙烯为基体的复合材料隔膜。
所述天然纤维素浆料按以下步骤制得:
(1)以竹纤维为原材料,将所述竹纤维加入到氢氧化钠溶液中,接着对上述氢氧化钠溶液进行抽真空蒸煮,蒸煮温度为300℃,蒸煮时间为2h;其中所述竹纤维与氢氧化钠溶液的质量比为1:4,氢氧化钠溶液的浓度为10wt%。
(2)将蒸煮后的竹纤维取出并用清水洗净,再将竹纤维浸泡于温度为80-90℃的热水中进行研磨,研磨后进行过滤,取固态过滤物;
(3)用打浆机对固态过滤物进行打浆、浓缩后得到固含量为60-70wt%的天然纤维素浆料。
按上述方法制得的天然纤维素浆料中含有大量的天然纤维素,天然纤维素具有吸湿性好,热稳定性佳的特点,少量的天然纤维素与聚丙烯进行复合后,能够改善聚丙烯吸湿性和热稳定性,使得隔膜对电解液的吸收保持能力加强,从而改善产品的倍率性能和循环性能。此外,天然纤维素和聚丙烯复合后,天然纤维素产生了交联,在一定程度上也增强了隔膜的拉伸强度和抗尖刺强度。埃洛石粉为一种具有纳米尺寸的中空管道的管状材料,具有良好的吸附性能,将其复合在隔膜中,能够进一步增强隔膜的吸湿性,而且埃洛石粉也同时能够提高隔膜的热稳定性能和机械强度。硅烷偶联剂能够使埃洛石粉和聚丙烯更好地相容。
作为优选,所述所述埃洛石粉经过预处理:
(1)称取粒径为300-500nm的埃洛石粉,将其添加到浓度为10wt%的盐酸溶液中并分散均匀,得到悬浊液;其中埃洛石粉与盐酸的质量比为1:10;
(2)将上述悬浊液放于水浴中进行超声波处理,其中水浴温度为60℃,处理时间为15分钟;
(3)将悬浊液取出并经离心分离后取固体粉末,将固体粉末用去离子水洗至中性后进行干燥;
(4)将干燥后的固体粉末进行煅烧,煅烧后埃洛石粉的预处理完毕;其中煅烧温度为500-600℃,煅烧时间为4小时。
经过预处理后的埃洛石粉去除了其自身结构内部的结晶水,其吸附性能和耐高温性能得到大幅提升。
作为优选,所述电池电容的制作包括以下步骤:
(1)以正极材料的总质量为100wt%,将65-91wt%的锰酸锂、2-15wt%活性炭、4-10wt%粘结剂、3-10wt%导电剂混合于氮甲基吡咯烷酮或者去离子水中,高速搅拌形成正极浆料,经涂覆设备均匀使涂层涂覆在腐蚀铝箔的上下两面上,以2.9-3.2g/cm3大小的密度碾压、冲切制成正极极片;
(2)以负极材料的总质量为100wt%,将65-90wt%的钛酸锂、2-15wt%的活性炭、5-10wt%的粘结剂、3-10wt%的导电剂混合于氮甲基吡咯烷酮或者去离子水中,高速搅拌形成负极浆料,经涂覆设备使涂层均匀涂覆在腐蚀铝箔的两面上,以1.8-2.2g/cm3大小的密度碾压、冲切制成负极极片;
(3)按照正、负极电极活性物质1-2:1的质量比进行电极的匹配,对正、负极片和隔膜采用“Z”型叠片的方式制作电芯,经干燥、封装后获得产品。
本发明与现有技术相比,有益效果是:
1本发明采用锰酸锂和钛酸锂的复合电极的有益效果是,通过活性炭的引入大大提升电极材料的导电性能和部分电容储能的特性,显著改善了产品的倍率性能,满足了大电流充放的需要;
2对锰酸锂和钛酸锂的掺杂包覆处理可以解决产气、溶解等问题,提高了循环寿命;
3复合导电剂的使用可以更好的构建导电网络,进一步提升功率密度。
4以聚丙烯为基体的复合材料隔膜具有更好的吸湿性、拉伸强度、抗尖刺强度和耐高温性。有利于提高产品的倍率性能、循环性能和使用寿命。
图1是本发明的电芯结构示意图。
图中:1正极极片,2负极极片,3隔膜,4电解液。
下面通过具体实施例对本发明的技术方案作进一步描述说明。
如果无特殊说明,本发明的实施例中所采用的原料均为本领域常用的原料,实施例中所采用的方法,均为本领域的常规方法。
图1为简化的电芯示意图,仅对本发明的构成进行示意说明。图1所示的新型电池电容,包括了正极极片1和负极极片2。正、负极片的两面均均匀涂覆有锰酸锂(钛酸锂)、活性炭、粘结剂、导电剂所混合的浆料。隔膜3以“Z”字的形式将正、负极极片完全包裹并彻底隔离,电解液4充盈于电池电容的结构中,浸润正、负极片和隔膜。
实施例1:
一种基于复合正、负极材料的新型电池电容,制备方法如下:
(1)将88wt%的锰酸锂、5wt%活性炭、4wt%粘结剂(PVDF)、3wt%的导电剂(SuperP+石墨烯)混合于氮甲基吡咯烷酮中,利用高速搅拌设备在真空下搅拌4小时形成均匀正极浆料,经涂覆设备均匀使涂层涂覆在腐蚀铝箔的上下两面上,以2.9g/cm3大小的密度碾压、冲切制成正极极片。
(2)将85wt%的钛酸锂、5wt%的活性炭、5wt%的粘结剂(PVDF)、5wt%的导电剂(SuperP+石墨烯+碳纳米管)混合于氮甲基吡咯烷酮中,利用高速搅拌设备在真空下搅拌4小时形成均匀负极浆料,经涂覆设备使涂层均匀涂覆在腐蚀铝箔的两面上,以2.1g/cm3大小的密度碾压、冲切制成负极极片。
(3)使用美国Celgard公司型号为C480的隔膜,电解液使用1M LiPF6和0.5M SBP为溶质,以体积比1:1:1的EC、DEC、DMC为溶剂。将一定厚度以1.5:1的正、负极活性物质比匹配正、负极极片,使用隔膜将正、负极极片隔开制成电芯,真空干燥24小时,在手套箱中注电解液后封装于铝塑膜中,静置12h后进行化成和二次封装,得到产品。
在本实施例中,所述锰酸锂和钛酸锂均经过了无定型炭包覆处理,其中无定型炭的包覆量为3wt%。且锰酸锂和钛酸锂的粒径小于500nm。
实施例2
一种基于复合正、负极材料的新型电池电容,制备方法如下:
(1)将91wt%的锰酸锂、2wt%活性炭、4wt%粘结剂(PVDF)、3wt%导电剂(SuperP+石墨烯)混合于氮甲基吡咯烷酮中,利用高速搅拌设备在真空下搅拌4小时形成均匀正极浆料,经涂覆设备均匀使涂层涂覆在腐蚀铝箔的上下两面上,以
3.2g/cm3大小的密度碾压、冲切制成正极极片。
(2)将90wt%的钛酸锂、2wt%的活性炭、5-wt%的粘结剂(PVDF)、3wt%的导电剂(SuperP+石墨烯+碳纳米管)混合于氮甲基吡咯烷酮中,利用高速搅拌设备在真空下搅拌4小时形成均匀负极浆料,经涂覆设备使涂层均匀涂覆在腐蚀铝箔的两面上,以2.2g/cm3大小的密度碾压、冲切制成负极极片。
(3)使用以聚丙烯为基材的复合材料隔膜,电解液使用1M LiPF6和0.5M SBP为溶质,以体积比1:1:1的EC、DEC、DMC为溶剂。将一定厚度以2:1的正、负极活性物质比匹配正、负极极片,使用隔膜将正、负极极片隔开制成电芯,真空干燥24小时,在手套箱中注电解液后封装于铝塑膜中,静置12h后进行化成和二次封装,得到产品。
在本实施例中,所述锰酸锂和钛酸锂均掺杂了10wt%的石墨烯,且锰酸锂和钛酸锂的粒径小于500nm。
所述以聚丙烯为基体的复合材料隔膜由以下物质制备而成:83wt%的聚丙烯,12wt%的天然纤维素浆料4wt%的埃洛石粉,1wt%的KH560硅烷偶联剂;将上述各物质混合均匀后通过干法工艺制得所述以聚丙烯为基体的复合材料隔膜。
实施例3
一种基于复合正、负极材料的新型电池电容,制备方法如下:
(1)将65wt%的锰酸锂、15wt%活性炭、10wt%粘结剂(PVDF)、10wt%导电剂(SuperP+石墨烯)混合于去离子水中,利用高速搅拌设备在真空下搅拌4小时形成均匀正极浆料,经涂覆设备均匀使涂层涂覆在腐蚀铝箔的上下两面上,以3.1g/cm3大小的密度碾压、冲切制成正极极片。
(2)将65wt%的钛酸锂、15wt%的活性炭、10wt%的粘结剂(PVDF)、10wt%的导电剂(SuperP+石墨烯+碳纳米管)混合于去离子水中,利用高速搅拌设备在真空下搅拌4小时形成均匀负极浆料,经涂覆设备使涂层均匀涂覆在腐蚀铝箔的两面上,以1.8g/cm3大小的密度碾压、冲切制成负极极片。
(3)使用以聚丙烯为基材的复合材料隔膜,,电解液使用1M LiPF6和0.5M SBP为溶质,以体积比1:1:1的EC、DEC、DMC为溶剂。将一定厚度以1:1的正、
负极活性物质比匹配正、负极极片,使用隔膜将正、负极极片隔开制成电芯,真空干燥24小时,在手套箱中注电解液后封装于铝塑膜中,静置12h后进行化成和二次封装,得到产品。
在本实施例中,所述锰酸锂和钛酸锂均均掺杂25wt%的石墨烯。且锰酸锂和钛酸锂的粒径小于500nm。
所述以聚丙烯为基体的复合材料隔膜由以下物质制备而成:85wt%的聚丙烯,10wt%的天然纤维素浆料,3.5wt%的埃洛石粉,1.5wt%的KH550硅烷偶联剂;将上述各物质混合均匀后通过干法工艺制得所述以聚丙烯为基体的复合材料隔膜。
在实施例2-3中,所述天然纤维素浆料按以下步骤制得:
(1)以竹纤维为原材料,将所述竹纤维加入到氢氧化钠溶液中,接着对上述氢氧化钠溶液进行抽真空蒸煮,蒸煮温度为300℃,蒸煮时间为2h;其中所述竹纤维与氢氧化钠溶液的质量比为1:4,氢氧化钠溶液的浓度为10wt%。
(2)将蒸煮后的竹纤维取出并用清水洗净,再将竹纤维浸泡于温度为85℃的热水中进行研磨,研磨后进行过滤,取固态过滤物;
(3)用打浆机对固态过滤物进行打浆、浓缩后得到固含量为65wt%左右的天然纤维素浆料。
所述埃洛石粉经过预处理:
(1)称取粒径为300-500nm的埃洛石粉,将其添加到浓度为10wt%的盐酸溶液中并分散均匀,得到悬浊液;其中埃洛石粉与盐酸的质量比为1:10;
(2)将上述悬浊液放于水浴中进行超声波处理,其中水浴温度为60℃,处理时间为15分钟;
(3)将悬浊液取出并经离心分离后取固体粉末,将固体粉末用去离子水洗至中性后进行干燥;
(4)将干燥后的固体粉末进行煅烧,煅烧后埃洛石粉的预处理完毕;其中煅烧温度为550℃,煅烧时间为4小时。
在实施例2中,所述活性炭是以椰壳为前驱体的活性炭,所述活性炭表面改性处理后使用,表面改性处理的方法为:将浓度为7.5wt%的硅烷偶联剂无水乙醇溶液与活性炭混合40min,然后再加入浓度为12wt%的铝酸酯偶联剂无水乙醇
溶液在混合40min,过滤,过滤物在75℃下干燥4.5h,再在102℃下活化1.5h,硅烷偶联剂用量为活性炭重量的0.75%,铝酸酯偶联剂用量为活性炭重量的1.25%。
在实施例3中,所述活性炭是以针状焦为前驱体的活性炭,所述活性炭表面改性处理后使用,表面改性处理的方法为:将浓度为5wt%的硅烷偶联剂无水乙醇溶液与活性炭混合30min,然后再加入浓度为8wt%的铝酸酯偶联剂无水乙醇溶液在混合30min,过滤,过滤物在80℃下干燥4h,再在105℃下活化1h,硅烷偶联剂用量为活性炭重量的0.5%,铝酸酯偶联剂用量为活性炭重量的1%。
对实施例1-3的产品在0.5C下进行恒流充放测试,实施例1的电池电容的比容量为60mAh/g,经过20000次循环后,容量保持率为80%;实施例2的电池电容的比容量为55mAh/g,经过20000次循环后,容量保持率为83%;实施例3的电池电容的比容量为51mAh/g,经过20000次循环后,容量保持率为82%。
以上述依据发明的理想实施例为启示,通过上述的说明内容,相关工作人员完全可以在不偏离本项发明技术思想的范围内,进行多样的变更和修改。本项发明技术性范围并不局限于说明书上的内容,必须要根据权利要求范围来确定其技术性范围。
Claims (11)
- 一种基于复合正、负极材料的新型电池电容,其特征在于,所述电池电容包括正极、负极、导电剂、粘结剂、电解液、隔膜和腐蚀铝箔片,所述电池电容以锰酸锂和活性炭的复合材料为正极,以钛酸锂和活性炭的复合材料为负极。
- 根据权利要求1所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述锰酸锂为经过碳、金属、金属氧化物中的一种或几种包覆或掺杂的锰酸锂,钛酸锂为经过碳或者石墨烯掺杂和包覆以及球化处理的钛酸锂。
- 根据权利要求1或2所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述锰酸锂为以纳米金属氧化物为前驱体混合掺杂元素合成的纳米复合锰酸锂,所述钛酸锂为纳米复合钛酸锂,且纳米复合锰酸锂和纳米复合钛酸锂的粒径小于500nm。
- 根据权利要求1所述的一种基于复合正、负极材料的新型电池电容,其特征在于:所述活性炭是以椰壳或针状焦为前驱体的活性炭,所述活性炭表面改性处理后使用,表面改性处理的方法为:将浓度为5-10wt%的硅烷偶联剂无水乙醇溶液与活性炭混合30-50min,然后再加入浓度为8-15wt%的铝酸酯偶联剂无水乙醇溶液在混合30-50min,过滤,过滤物在70-80℃下干燥4-5h,再在100℃-105℃下活化1-2h,硅烷偶联剂用量为活性炭重量的0.5-1%,铝酸酯偶联剂用量为活性炭重量的1-1.5%。
- 根据权利要求1所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述导电剂为导电碳黑、碳纳米管或单层石墨烯,所述的粘结剂为聚偏氟乙烯或聚四氟乙烯。
- 根据权利要求1所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述电解液的溶质为高氯酸锂、六氟砷酸锂、四氟硼酸锂、六氟磷酸锂、三氟甲基磺酸锂、四氟硼酸四乙基铵盐中的至少一种,电解液的溶剂为乙腈、碳酸乙烯酯、碳酸丙烯酯、碳酸二甲酯、碳酸二乙酯、碳酸甲乙酯中的一种或者几种,电解液的添加剂为三(五氟化苯基)硼、磷酸三甲酯、磷酸三苯酯、二氮苯基酮中的一种或几种。
- 根据权利要求1所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述隔膜为聚丙烯隔膜、聚乙烯隔膜或者以聚丙烯为基体的复合材料隔膜。
- 根据权利要求7所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述以聚丙烯为基体的复合材料隔膜由以下物质制备而成:80-85wt%的聚丙烯,10-15wt%的天然纤维素浆料,3-5wt%的埃洛石粉,0.5-1.5wt%的硅烷偶联剂;将上述各物质混合均匀后通过干法工艺制得所述以聚丙烯为基体的复合材料隔膜。
- 根据权利要求8所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述天然纤维素浆料按以下步骤制得:(1)以竹纤维为原材料,将所述竹纤维加入到氢氧化钠溶液中,接着对上述氢氧化钠溶液进行抽真空蒸煮,蒸煮温度为300℃,蒸煮时间为2h;其中所述竹纤维与氢氧化钠溶液的质量比为1:4,氢氧化钠溶液的浓度为10wt%;(2)将蒸煮后的竹纤维取出并用清水洗净,再将竹纤维浸泡于温度为80-90℃的热水中进行研磨,研磨后进行过滤,取固态过滤物;(3)用打浆机对固态过滤物进行打浆、浓缩后得到固含量为60-70wt%的天然纤维素浆料。
- 根据权利要求8所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述埃洛石粉经过预处理:(1)称取粒径为300-500nm的埃洛石粉,将其添加到浓度为10wt%的盐酸溶液中并分散均匀,得到悬浊液;其中埃洛石粉与盐酸的质量比为1:10;(2)将上述悬浊液放于水浴中进行超声波处理,其中水浴温度为60℃,处理时间为15分钟;(3)将悬浊液取出并经离心分离后取固体粉末,将固体粉末用去离子水洗至中性后进行干燥;(4)将干燥后的固体粉末进行煅烧,煅烧后埃洛石粉的预处理完毕;其中煅烧温度为500-600℃,煅烧时间为4小时。
- 根据权利要求1所述的一种基于复合正、负极材料的新型电池电容,其特征在于,所述电池电容的制作包括以下步骤:(1)以正极材料的总质量为100wt%,将65-91wt%的锰酸锂、2-15wt%活性炭、4-10wt%粘结剂、3-10wt%导电剂混合于氮甲基吡咯烷酮或者去离子水中,高速搅拌形成正极浆料,经涂覆设备均匀使涂层涂覆在腐蚀铝箔的上下两面上,以2.9-3.2g/cm3大小的密度碾压、冲切制成正极极片;(2)以负极材料的总质量为100wt%,将65-90wt%的钛酸锂、2-15wt%的活性炭、5-10wt%的粘结剂、3-10wt%的导电剂混合于氮甲基吡咯烷酮或者去离子水中,高速搅拌形成负极浆料,经涂覆设备使涂层均匀涂覆在腐蚀铝箔的两面上,以1.8-2.2g/cm3大小的密度碾压、冲切制成负极极片;(3)按照正、负极电极活性物质1-2:1的质量比进行电极的匹配,对正、负极片和隔膜采用“Z”型叠片的方式制作电芯,经干燥、封装后获得产品。
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DE102015122963A1 (de) | 2016-07-07 |
CN104795249A (zh) | 2015-07-22 |
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