CN106654349B - A kind of lithium-sulfur cell - Google Patents

A kind of lithium-sulfur cell Download PDF

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CN106654349B
CN106654349B CN201710137818.1A CN201710137818A CN106654349B CN 106654349 B CN106654349 B CN 106654349B CN 201710137818 A CN201710137818 A CN 201710137818A CN 106654349 B CN106654349 B CN 106654349B
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negative electrode
lithium
electrode tab
carbon
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CN106654349A (en
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宗铭
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Shenzhen Xinguneng Technology Co ltd
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Yu Guo Hong
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Abstract

The present invention relates to a kind of lithium-sulfur cell, including positive plate and negative electrode tab, the preparation of positive plate: being the mixture that is composed of 1:3 for conductive agent according to mass ratio using poly- naphthalene/sulphur composite material as positive active material, Ketjen black ECP600JD and carbon nano-fiber；Negative electrode tab preparation: weighing stable state lithium powder and carbon material according to mass ratio, according to volume ratio is the mixture that mixes of 7:7:1 as solvent using ethylene carbonate (EC), ethylene methacrylic ester (MA) and three fluoropropylene carbonates (TFPC).

Description

A kind of lithium-sulfur cell
Technical field
The present patent application is 2016 applying date February 05th, application No. is: 201610080160.0, it is entitled " a kind of The divisional application of the application for a patent for invention of the preparation method of lithium-sulfur cell ".The invention belongs to electrode material preparation fields, especially relate to And a kind of lithium sulphur battery electrode material and the method for preparing lithium-sulfur cell using this kind of electrode material.
Background technique
Lithium ion battery (Lithium-ion battery, LIB), also known as lithium secondary battery are that a kind of be recycled is filled The mobile power source equipment of electricity.LIB has high-energy density, high power density, has extended cycle life, cleans nontoxic and memory-less effect Many advantages, such as, since the nineties in last century, LIB was commercialized by Sony, LIB has obtained widely developing rapidly. Oneself warp of LIB becomes the power supply of most of mobile electronic devices at present.In recent years, people deeply and widely grind to LIB Study carefully.In LIB, negative electrode material has very big influence to the performance of battery, and developing excellent negative electrode material is also to improve LIB One of the key factor of energy.Carbon material is a kind of most important LIB negative electrode material, oneself is through there is hundreds of to possess different structure at present Carbon material be used as negative electrode of lithium ion battery, these materials include natural graphite, electrographite, coke, carbon fiber, interphase Carbosphere, carbon black etc..
However, there are problems in lithium-sulfur cell commercialization process, such as lithium metal unstable chemcial property, when use, is deposited Potential dangerous；When cathode uses metallic lithium foil, for battery after multiple charge and discharge, metallic lithium foil surface easily forms branch It is brilliant.The continuous growth of dendrite causes battery capacity to decline, and dendritic growth may pierce through diaphragm, cause battery short circuit, cause peace Full problem.
Hard carbon is the pyrolytic carbon of high molecular polymer, is difficult to be graphitized at high temperature.The reversible capacity energy of hard carbon Higher, cycle performance is also fine.But that there is also electrode potentials is excessively high, (i.e. intercalation potential is less than de- lithium electricity to current potential lag for hard carbon Position) and for the first time circulation irreversible capacity it is big the disadvantages of.
Currently, most of lithium-sulfur cell all uses lithium metal as cathode.Lithium is as cathode in multiple charge and discharge process It can lead to the formation of a product by ten current density unevenness.Branch product will lead to diaphragm and penetrate, and then make battery that short circuit occur, and be main Security risk source.If adding graphene in cathode, the specific surface area of cathode becomes larger, and surface current density reduces, meanwhile, Loose graphene provides the space of lithium deposition, to keep the growth of lithium branch product more and more difficult.For existing for cathode of lithium Problem, the improvement and research that researcher carries out are less.Sum up main include two aspect: one is to added from electrolyte Agent is modified, by the way that different additives, such as LiNO is added3With PEO etc., promote cathode of lithium surface fast in charge and discharge process Speed forms more stable SEI film, it would be desirable to inhibit Li dendrite and improve cycle performance.However additive is in charge and discharge process It is gradually consumed, influences the stability and continuity of battery.Second is that starting with from the preparation process of lithium electrode, closed by using lithiumation Object coats lithium powder or electrodeposit metals lithium, and lithium foil surface increases the methods of protective layer, improves cycle efficieny and cycle life, But operating process is also complex.
Summary of the invention
In order to solve the problems in the existing technology, the object of the present invention is to provide one kind by stable state lithium powder and special to match Than the negative electrode slurry that carbon material is prepared, and the lithium-sulfur cell being prepared by the slurry, which solve in the prior art Using the materials bring technological deficiency such as hard carbon and solve cathode of lithium battery it is improved present in stability and continuity The technical problems such as poor and complicated for operation.
A kind of preparation method of lithium-sulfur cell, comprising the following steps:
The preparation of step 1, positive plate: it as positive active material, Ketjen black ECP600JD and is received using poly- naphthalene/sulphur composite material It is conductive agent that rice carbon fiber, which is the mixture that 1:3 is composed according to mass ratio, and polyvinylpyrrolidone and polyethyleneimine are pressed It is the mixed system that 2:1 is mixed according to volume ratio is binder；Poly- naphthalene/sulphur composite material in the anode sizing agent of sulfur-bearing is led The mass ratio of electric agent and binder is 8:5:1；Mixture binder is dissolved in by ethylene carbonate (EC), ethylene methacrylic ester (MA) Solution is made in the solvent mixed with three fluoropropylene carbonates (TFPC) according to volume ratio for 7:7:1；Wherein, according to matter Amount calculates, and weighs solvent according to the ratio that solid content is 30%, solid includes poly- naphthalene/sulphur composite material and conductive agent；It will gather again Naphthalene/sulphur composite material and conductive agent in mass ratio after mixing, pour into the solvent for having dissolved binder, are fabricated to positive slurry Material；
Then obtained slurry is uniformly coated in foamed nickel current collector.It is placed in a vacuum drying oven drying again, removes Solvent and moisture, the temperature in vacuum oven are 55 DEG C, drying time 9h, are struck off the slurry of foam nickel surface with blade Completely, then positive plate it flattens, then positive plate is placed in a vacuum drying oven and is dried again；
Step 2, negative electrode tab preparation: stable state lithium powder and carbon material are weighed according to mass ratio, with ethylene carbonate (EC), first It is solvent that base vinyl acetate (MA) and three fluoropropylene carbonates (TFPC), which are the mixture that 7:7:1 is mixed according to volume ratio,. Wherein, according to Mass Calculation, solvent is weighed according to the ratio that solid content is 30%, solid includes stable state lithium powder and carbon material；First Carbon material is dissolved in solvent, then stable state lithium powder is poured into above-mentioned solution, is applied to nickel foam afflux after mixing To obtain negative electrode tab on body；Negative electrode tab is placed on heating sheet and is heated so that solvent volatilizees；Then negative electrode tab is flattened stand-by； Wherein, the mass ratio of stable state lithium powder and carbon material is 7-10:3-8；The temperature heated on heating sheet is 70 DEG C, and heating time is 8h；
Step 3, battery assembly: lithium sulphur electricity is assembled into using negative electrode tab made from positive plate made from step 1 and step 2 Pond.
Further, described in step 1 with blade by the slurry scraped clean of foam nickel surface, operation that positive plate is flattened It is completed in vacuum glove box.
Further, in step 2 negative electrode tab be placed on heating sheet heat so that solvent volatilize, then negative electrode tab flatten to Operation is completed in vacuum glove box.
Further, the powder of stable state lithium described in step 2 is made of dropping liquid emulsifying technology (DET), and lithium powder diameter is 50 μm -70 μm。
A kind of lithium-sulfur cell negative electrode material, characterized by comprising: in terms of mass fraction, by following feedstock composition group At: 7-10 parts of stable state lithium powder, 3-8 parts of carbon materials and solvent.
Further, the stable state lithium powder is made of dropping liquid emulsifying technology (DET), and lithium powder diameter is 50 μm -70 μm.
Further, it is 10 that the carbon material, which is vertical array column-shaped carbon nanotube (VACNT) and mesoporous carbon according to mass ratio: 1 mixture mixed.
Further, the solvent is ethylene carbonate (EC), ethylene methacrylic ester (MA) and three fluoropropylene carbonates (TFPC) mixed solvent mixed according to volume ratio for 7:7:1.
A kind of preparation method of lithium-sulfur cell, using lithium-sulfur cell negative electrode material as described above as cathode, feature It is to include the following steps:
(1) anode sizing agent of sulfur-bearing is coated in collector and positive plate is made；
(2) stable state lithium powder and carbon material are weighed according to mass ratio, with ethylene carbonate (EC), ethylene methacrylic ester (MA) and It is solvent that three fluoropropylene carbonates (TFPC), which are the mixture that 7:7:1 is mixed according to volume ratio,；First the carbon material It is dissolved in the solvent, then stable state lithium powder is poured into above-mentioned solution, be applied on collector to obtain after mixing To negative electrode tab；Negative electrode tab is placed on heating sheet and is heated so that solvent volatilizees；Then negative electrode tab is flattened stand-by；
(3) anode, cathode, diaphragm are assembled into button cell.
Further, the anode sizing agent of sulfur-bearing as described in step (1) includes: poly- naphthalene/sulphur composite material, conductive agent, bonding Agent and solvent；The conductive agent is composed of Ketjen black ECP600JD and carbon nano-fiber according to mass ratio for 1:3, described Binder by polyvinylpyrrolidone and polyethyleneimine mixed for 2:1 according to volume ratio；The solvent is by carbonic acid second Enester (EC), ethylene methacrylic ester (MA) and three fluoropropylene carbonates (TFPC) are mixed according to volume ratio for 7:7:1；First will The in the mixed solvent that binder is dissolved in, then in mass ratio after mixing by poly- naphthalene/sulphur composite material and conductive agent, pour into In the solvent for dissolving binder, it is fabricated to anode sizing agent, then anode sizing agent is uniformly smeared on a current collector, anode is made Piece.
Further, the positive plate need to heat moisture removal and solvent in a vacuum drying oven, then strike off its surface And pressing；Temperature in the vacuum oven is 55 DEG C, drying time 9h.
Further, the mass ratio of poly- naphthalene/sulphur composite material in the anode sizing agent of the sulfur-bearing, conductive agent and binder For 8:5:1.
Further, negative electrode tab described in step (2) need to then be flattened in 40 DEG C of -70 DEG C of heating 8h-11h to remove solvent For use.
Further, the operation in step (2) and (3) is completed in the vacuum glove box full of argon gas.
The lithium-sulfur cell negative electrode material and lithium-sulfur cell that the present invention is prepared have the following beneficial effects:
(1) the lithium-sulfur cell negative electrode material that the present invention is prepared is made by stable state lithium powder and the carbon material of specific proportion Cathode is compared with common lithium foil electrode, and specific surface area is bigger, and porosity is higher, more complete with electrolyte contacts, to effectively put Electric area is bigger, and impedance is smaller, and can effectively inhibit the growth of Li dendrite, can express preferable cycle performance and forthright again Energy.
(2) the lithium-sulfur cell negative electrode material that the present invention is prepared is made of the carbon material of stable state lithium powder and specific proportion, The volume that a large amount of carbon nanotubes are effectively taken into account used in it plays the role of the effect of carbon material and binder, effectively keeps away The use for having exempted from adhesive, the cost cleverly reduced, reduces processing step, close to the actual energy of ten raising lithium-sulfur cells Degree also has important meaning.
(3) had in the lithium-sulfur cell negative electrode material that the present invention is prepared using vertical array column-shaped carbon nanotube (VACNT) Have good orientation, can be formed with collector it is good contact and formed efficiently and directionally conducting matrix grain, effectively improve lithium-sulfur cell Negative electrode material middle skeleton electric conductivity.Its structural advantage for sufficiently combining mesoporous carbon again, highly ordered mesosize pores carbon have specific surface The features such as product is big, uniform pore diameter, pore volume is very high, porous structure and the high conductivity of being mutually related.The present invention is sufficiently sharp With the advantage of the two structure, it can effectively weaken shuttle effect and dendritic growth in continuous charge and discharge process, compare conventional electrodes Show better cycle performance and high rate performance.
(4) in terms of the conductive additive of anode, the present invention adds Ketjen black ECP600JD and carbon nano-fiber, Hou Zheke Three-dimensional conductive network is formed, not only can increase the remote conductive ability in pole piece, but also be not easy to be permitted the product formed in discharge process It is completely covered, so as to improve the surface texture of pole piece;The former using Ketjen black ECP600JD rich space cellular structure and The cycle performance of lithium-sulfur cell also can be improved in good adsorption properties.
(5) positive active material of the invention has selected poly- naphthalene/sulphur composite material, and poly- naphthalene is for having one in lithium-sulfur cell Determine advantage: (1) poly- naphthalene is conducting polymer, big in structure, and n key makes it easier to conduction, can be obviously improved the conduction of sulfur electrode Property;(2) poly- naphthalene has the layer structure of similar graphite, and structure is easier to be closely connected with elemental sulfur, its electrode can be inhibited anti- Answer the dissolution of the more lithium sulfides of product in the electrolytic solution;(3) poly- naphthalene has certain capacity as electrode material, can be with sulfur electrode Generate synergistic effect.
(6) present invention has also especially selected the mixed system of polyvinylpyrrolidone and polyethyleneimine in positive electrode As binder, thus the porous structure with strong holding sulphur anode in cyclic process.
(7) present invention has selected the mixed system solvent the most of three kinds of substances, and by experiment, which can preferably be kept The structure feature and advantage of the raw material of various pole pieces, same ethylene carbonate (EC), ethylene methacrylic ester (MA) can get good Good low temperature properties, and preferable discharge capacity and circulation longevity can be obtained plus a small amount of three fluoropropylene carbonates (TFPC) Life.The selection of three kinds of solvents takes into account the optimum combination performance for considering solvent and the factor in terms of cost, so that final preparation Obtained product has better stability and higher quality.
Specific embodiment
Embodiment one:
The preparation of positive plate: using poly- naphthalene/sulphur composite material as positive active material, Ketjen black ECP600JD and Nano carbon fibers It is conductive agent that dimension, which is the mixture that 1:3 is composed according to mass ratio, and polyvinylpyrrolidone and polyethyleneimine are according to volume Than being binder for the mixed system that 2:1 is mixed.
Poly- naphthalene/sulphur composite material, conductive agent and binder mass ratio in the anode sizing agent of sulfur-bearing is 8:5:1.Mixed Fit binder is dissolved in by ethylene carbonate (EC), ethylene methacrylic ester (MA) and three fluoropropylene carbonates (TFPC) according to volume Than solution is made in the solvent that mixes for 7:7:1.Wherein, according to Mass Calculation, claim according to the ratio that solid content is 30% Solvent is taken, solid includes poly- naphthalene/sulphur composite material and conductive agent.It is again that poly- naphthalene/sulphur composite material and conductive agent is mixed in mass ratio After closing uniformly, pours into the solvent for having dissolved binder, be fabricated to anode sizing agent.
Then obtained slurry is uniformly coated in foamed nickel current collector.It is placed in a vacuum drying oven drying again, removes Solvent and moisture, the temperature in vacuum oven are 55 DEG C, drying time 9h, are struck off the slurry of foam nickel surface with blade Completely, then with certain pressure positive plate is flattened.Then positive plate is placed in a vacuum drying oven and is dried again.The above operation is equal It is completed in vacuum glove box.
Negative electrode tab preparation: stable state lithium powder and carbon material are weighed according to mass ratio, with ethylene carbonate (EC), ethylene methacrylic It is solvent that ester (MA) and three fluoropropylene carbonates (TFPC), which are the mixture that 7:7:1 is mixed according to volume ratio,.Wherein, it presses According to Mass Calculation, solvent is weighed according to the ratio that solid content is 30%, solid includes trustworthy state lithium powder and carbon material.
First carbon material is dissolved in solvent, then stable state lithium powder is poured into above-mentioned solution, is applied to after mixing To obtain negative electrode tab in foamed nickel current collector；Negative electrode tab is placed on heating sheet and is heated so that solvent volatilizees；Then cathode Piece flattens stand-by；Wherein, the mass ratio of stable state lithium powder and carbon material is 10:8；The temperature heated on heating sheet is 70 DEG C, heating Time is 8h.The above operation is completed in vacuum glove box.
About poly- naphthalene/sulphur composite material preparation method: taking appropriate poly- naphthalene to be scattered in deionized water, ultrasonic disperse adds Enter a certain amount of Na2S203.5H2Re-ultrasonic dispersion after 0;The hydrochloric acid solution of suitable 1 mol/L is slowly added dropwise into mixture, Until above-mentioned solution ph is 7；Continue to filter after being stirred to react, it is poly- to get arriving that sample is placed in a vacuum drying oven drying Naphthalene/sulphur composite material.
Battery assembly and test: button battery assembles in the glove box full of argon gas.Using above-mentioned negative electrode tab as cathode, Using Celgard2400 diaphragm and 2025 type button batteries.Electrolyte is that 1M LiClO4,0.15M LiNO3 are dissolved in DOL: DME(volume ratio 1:1).Battery is placed in blue electrical measurement test system (CT2001A) and carries out constant current test.Charging/discharging voltage range is 1.5- 3.0V, test temperature are room temperature.
Embodiment two:
Compared with embodiment one, embodiment two changes the quality of stable state lithium powder and carbon material in negative electrode tab preparation process Temperature than being heated on heating sheet for 7:3 is 40 DEG C, heating time 11h.Remaining operation and explanation are the same as embodiment one.
Embodiment three:
Compared with embodiment one, embodiment two changes the quality of stable state lithium powder and carbon material in negative electrode tab preparation process Temperature than being heated on heating sheet for 6:5 is 60 DEG C, heating time 9h.Remaining operation and explanation are the same as embodiment one.
Compared to common lithium foil electrode, when the cathode of embodiment one, two and three is using stable state lithium powder and mixing carbon material, Lithium-sulfur cell of the invention can express better first charge-discharge specific capacity, while capacity retention ratio exists after 100 circulations 95.8% or more.
The button cell of each embodiment does AC impedance comparative experiments after standing 24 hours.Experimental result is shown, works as implementation After example one, two and three is using stable state lithium powder and mixing carbon material, compared to common lithium foil electrode, the resistance of lithium-sulfur cell of the invention Anti- to greatly reduce, reason is the large specific surface area of stable state lithium powder, expressible out faster electronics biography complete with electrolyte contacts It passs and shifts.
Meanwhile the lithium-sulfur cell negative electrode material that is prepared of the present invention is by the carbon material group of stable state lithium powder and specific proportion At, used in the volume effectively taken into account of a large amount of carbon nanotubes play the role of the effect of carbon material and binder, effectively The use for avoiding adhesive, the cost cleverly reduced reduces processing step, the practical energy for improving lithium-sulfur cells to ten Metric density also has important meaning.
(3) had in the lithium-sulfur cell negative electrode material that the present invention is prepared using vertical array column-shaped carbon nanotube (VACNT) Have good orientation, can be formed with collector it is good contact and formed efficiently and directionally conducting matrix grain, effectively improve lithium-sulfur cell Negative electrode material middle skeleton electric conductivity.Its structural advantage for sufficiently combining mesoporous carbon again, highly ordered mesosize pores carbon have specific surface The features such as product is big, uniform pore diameter, pore volume is very high, porous structure and the high conductivity of being mutually related.The present invention is sufficiently sharp With the advantage of the two structure, it can effectively weaken shuttle effect and dendritic growth in continuous charge and discharge process, compare conventional electrodes Show better cycle performance and high rate performance.
(4) in terms of the conductive additive of anode, the present invention adds Ketjen black ECP600JD and carbon nano-fiber, Hou Zheke Three-dimensional conductive network is formed, not only can increase the remote conductive ability in pole piece, but also be not easy to be permitted the product formed in discharge process It is completely covered, so as to improve the surface texture of pole piece;The former using Ketjen black ECP600JD rich space cellular structure and The cycle performance of lithium-sulfur cell also can be improved in good adsorption properties.
(5) positive active material of the invention has selected poly- naphthalene/sulphur composite material, and poly- naphthalene is for having one in lithium-sulfur cell Determine advantage: (1) poly- naphthalene is conducting polymer, big in structure, and n key makes it easier to conduction, can be obviously improved the conduction of sulfur electrode Property;(2) poly- naphthalene has the layer structure of similar graphite, and structure is easier to be closely connected with elemental sulfur, its electrode can be inhibited anti- Answer the dissolution of the more lithium sulfides of product in the electrolytic solution;(3) poly- naphthalene has certain capacity as electrode material, can be with sulfur electrode Generate synergistic effect.
(6) present invention has also especially selected the mixed system of polyvinylpyrrolidone and polyethyleneimine in positive electrode As binder, thus the porous structure with strong holding sulphur anode in cyclic process.
(7) present invention has selected the mixed system solvent the most of three kinds of substances, and by experiment, which can preferably be kept The structure feature and advantage of the raw material of various pole pieces, same ethylene carbonate (EC), ethylene methacrylic ester (MA) can get good Good low temperature properties, and preferable discharge capacity and circulation longevity can be obtained plus a small amount of three fluoropropylene carbonates (TFPC) Life.The selection of three kinds of solvents takes into account the optimum combination performance for considering solvent and the factor in terms of cost, so that final preparation Obtained product has better stability and higher quality.
Basic principles and main features and advantages of the present invention of the invention have been shown and described in above embodiments.The industry Technical staff it should be appreciated that the present invention is not limited to the above embodiments, what is described in the above embodiment and the description is only Illustrate the principle of the present invention, rather than limits the scope of the invention in any way, without departing from the scope of the invention, Various changes and improvements may be made to the invention, these changes and improvements are both fallen in claimed range.

Claims (3)

1. a kind of lithium-sulfur cell, including positive plate and negative electrode tab, it is characterised in that:
The preparation of step 1, positive plate: using poly- naphthalene/sulphur composite material as positive active material, Ketjen black ECP600JD and nano-sized carbon It is conductive agent that fiber, which is the mixture that 1:3 is composed according to mass ratio, and polyvinylpyrrolidone and polyethyleneimine are according to body Product is binder than being the mixed system that 2:1 is mixed；Poly- naphthalene/sulphur composite material, conductive agent in the anode sizing agent of sulfur-bearing Mass ratio with binder is 8:5:1；Mixture binder is dissolved in by ethylene carbonate (EC), ethylene methacrylic ester and three fluoro Solution is made in the solvent that propene carbonate (TFPC) is mixed according to volume ratio for 7:7:1；Wherein, according to Mass Calculation, Solvent is weighed according to the ratio that solid content is 30%, solid includes poly- naphthalene/sulphur composite material and conductive agent；Again by poly- naphthalene/sulphur Composite material and conductive agent in mass ratio after mixing, pour into the solvent for having dissolved binder, are fabricated to anode sizing agent；
Then obtained slurry is uniformly coated in foamed nickel current collector；
It is placed in a vacuum drying oven drying again, removes solvent and moisture, the temperature in vacuum oven is 55 DEG C, and drying time is 9h is flattened by the slurry scraped clean of foam nickel surface, then positive plate with blade, positive plate is then placed in vacuum oven In dry again；
Step 2, negative electrode tab preparation: stable state lithium powder and carbon material are weighed according to mass ratio, with ethylene carbonate (EC), methyl second It is solvent that enester and three fluoropropylene carbonates (TFPC), which are the mixture that 7:7:1 is mixed according to volume ratio,；
Wherein, according to Mass Calculation, solvent is weighed according to the ratio that solid content is 30%, solid includes stable state lithium powder and carbon materials Material；First carbon material is dissolved in solvent, then stable state lithium powder is poured into above-mentioned solution, is applied to nickel foam after mixing To obtain negative electrode tab on collector；Negative electrode tab is placed on heating sheet and is heated so that solvent volatilizees；Then negative electrode tab is flattened For use；Wherein, the mass ratio of stable state lithium powder and carbon material is 7-10:3-8；The temperature heated on heating sheet is 70 DEG C, when heating Between be 8h；Stable state lithium powder described in step 2 is made of dropping liquid emulsifying technology (DET), and lithium powder diameter is 50 μm -70 μm；It is described Carbon material be vertical array column-shaped carbon nanotube (VACNT) and mesoporous carbon according to the mixture that mass ratio is that 10:1 is mixed；
Step 3, battery assembly: lithium-sulfur cell is assembled into using negative electrode tab made from positive plate made from step 1 and step 2.
2. lithium-sulfur cell according to claim 1, it is characterised in that: with blade by the slurry of foam nickel surface described in step 1 Expect scraped clean, the operation that positive plate flattens is completed in vacuum glove box.
3. lithium-sulfur cell according to claim 1, it is characterised in that: in step 2 negative electrode tab be placed on heating sheet heat with Solvent is set to volatilize, negative electrode tab, which is then flattened stand-by operation, is completed in vacuum glove box.
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