JPH11268907A - Cavity carbon and its production - Google Patents
Cavity carbon and its productionInfo
- Publication number
- JPH11268907A JPH11268907A JP10095391A JP9539198A JPH11268907A JP H11268907 A JPH11268907 A JP H11268907A JP 10095391 A JP10095391 A JP 10095391A JP 9539198 A JP9539198 A JP 9539198A JP H11268907 A JPH11268907 A JP H11268907A
- Authority
- JP
- Japan
- Prior art keywords
- carbon
- cavity
- resin particles
- hollow
- lithium
- 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.)
- Pending
Links
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
Landscapes
- Carbon And Carbon Compounds (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、内部に空洞が形
成された空洞炭素およびその製造方法に関するものであ
り、特に、吸着剤やリチウム電池の負極に使用できる空
洞炭素に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow carbon having a cavity formed therein and a method for producing the same, and more particularly to a hollow carbon which can be used as an adsorbent or a negative electrode of a lithium battery.
【０００２】[0002]
【従来の技術】従来から、炭素は吸着剤の材料として使
用されており、このような炭素は一般に球状の粒に形成
されている。また、このような炭素はリチウムを吸蔵す
る性質を有しており、そのためリチウム電池の負極とし
ても利用されている。2. Description of the Related Art Conventionally, carbon has been used as a material for an adsorbent, and such carbon is generally formed into spherical particles. Further, such carbon has a property of absorbing lithium, and thus is also used as a negative electrode of a lithium battery.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
吸着剤として使用される炭素は球状に形成されているた
め、その吸着面積は球の表面積に限られ、比表面積を増
加させるには限度がある。また、リチウム電池の負極と
して使用される炭素も、リチウムを吸蔵する容量に限界
があり、リチウム電池の性能の向上が困難であった。However, since the carbon used as the above adsorbent is formed in a spherical shape, its adsorption area is limited to the surface area of the sphere, and there is a limit in increasing the specific surface area. . Further, carbon used as a negative electrode of a lithium battery also has a limitation in capacity for storing lithium, and it has been difficult to improve the performance of the lithium battery.
【０００４】例えば、黒鉛におけるリチウムの吸蔵可能
な理論的容量は３７２ｍＡｈ／ｇであり、通常の形状で
はこれ以上の容量アップは見込めない。また、難黒鉛質
炭素材料の中には、前記黒鉛の理論的容量より高容量を
示すものがあるとの報告もされているが、このような材
料では、電圧に平坦性がないことや真密度が低い等の問
題がある。For example, the theoretical capacity of graphite in which lithium can be stored is 372 mAh / g, and a further increase in capacity cannot be expected in a normal shape. It has also been reported that some non-graphitic carbon materials have higher capacities than the theoretical capacity of the graphite, but such materials do not have flatness in voltage or are not truly flat. There are problems such as low density.
【０００５】この発明は、このような事情に鑑みなされ
たもので、吸着剤として用いる場合、吸着面積を増加で
き、リチウム電池の負極として用いた場合には、リチウ
ムの吸蔵量を増加し高性能のリチウム電池を得ることの
できる空洞炭素およびその製造方法の提供をその目的と
する。The present invention has been made in view of such circumstances, and when used as an adsorbent, the adsorption area can be increased. When used as a negative electrode of a lithium battery, the amount of lithium occlusion can be increased to improve the performance. It is an object of the present invention to provide a hollow carbon capable of obtaining a lithium battery and a method for producing the same.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
め、この発明の請求項１に係る空洞炭素は、炭素粉末の
成形体からなり内部に空洞が形成されているという構成
をとる。すなわち、内部に空洞を形成することにより、
空洞の壁面も吸着面となり、吸着面積を大幅に増加する
ことができる。Means for Solving the Problems In order to achieve the above object, the hollow carbon according to the first aspect of the present invention has a structure in which a hollow body is formed from a molded body of carbon powder. That is, by forming a cavity inside,
The wall surface of the cavity also serves as an adsorption surface, and the adsorption area can be greatly increased.
【０００７】また、請求項２にかかる発明では、請求項
１に記載の空洞炭素において、その空洞内にリチウムが
吸蔵されているという構成をとる。すなわち、炭素をリ
チウム電池の負極として使用する場合、球状の炭素では
リチウムの吸蔵量に限りがあるが、この空洞炭素の空洞
を利用することにより、その吸蔵量が大幅にアップす
る。In the invention according to claim 2, the hollow carbon according to claim 1 has a configuration in which lithium is occluded in the cavity. In other words, when carbon is used as a negative electrode of a lithium battery, the amount of lithium absorbed is limited in spherical carbon, but the use of the hollow carbon greatly increases the amount of occlusion.
【０００８】請求項３にかかる発明は、炭素粉末と樹脂
粒子を混合して樹脂粒子の表面に炭素粉末を付着させた
のち加熱処理して樹脂粒子を蒸発除去するかまたは樹脂
粒子を溶解可能な溶剤を用いて樹脂粒子を溶解除去する
という構成をとる。このような方法をとることにより、
簡単に空洞炭素を得ることができ、かつ、その形状も樹
脂粒子の形状を変えることにより適宜変更することがで
きる。つぎに、この発明による空洞炭素およびその製造
方法を図を用いて詳しく説明する。According to a third aspect of the present invention, it is possible to mix the carbon powder and the resin particles, attach the carbon powder to the surface of the resin particles, and then perform a heat treatment to evaporate and remove the resin particles or dissolve the resin particles. The resin particles are dissolved and removed using a solvent. By taking such a method,
The hollow carbon can be easily obtained, and the shape can be appropriately changed by changing the shape of the resin particles. Next, the hollow carbon according to the present invention and a method for producing the same will be described in detail with reference to the drawings.
【０００９】[0009]
【発明の実施の形態】図１および図２は、この発明の一
実施形態による空洞炭素１を示している。この空洞炭素
１は吸着剤として使用されるものであり、全体形状が球
状で内部に空洞２が形成されている。そして、表面には
空洞２と連通する多数の微細孔３が形成されている。こ
の微細孔３は気体，液体や微粒子の固体が通過できる程
度の大きさになっている。1 and 2 show a hollow carbon 1 according to an embodiment of the present invention. The hollow carbon 1 is used as an adsorbent, has a spherical shape as a whole, and has a hollow 2 formed therein. A large number of fine holes 3 communicating with the cavity 2 are formed on the surface. The micropores 3 are large enough to allow gas, liquid or fine solid particles to pass through.
【００１０】上記空洞炭素１は、粒径が１０〜１５０μ
ｍで、肉厚が１〜３０μｍ、真密度が１．１〜２．２ｇ
／ｃｍ3 になっており、多数からなる集合体に形成して
吸着剤や濾過剤として使用される。この場合、処理され
る物は特に限定されず、炭素に吸着されるものであれば
何にでも使用することができる。例えば、水や他の液体
を濾過して液中の不純物や有機溶剤等を除去することに
使用してもよいし、フッ素系や塩素系のガスを吸着させ
て脱臭剤として使用することもできる。The hollow carbon 1 has a particle size of 10 to 150 μm.
m, wall thickness is 1 to 30 μm, true density is 1.1 to 2.2 g
/ Cm 3 , which is formed into an aggregate composed of many and used as an adsorbent or a filtering agent. In this case, the material to be treated is not particularly limited, and any material can be used as long as it is adsorbed by carbon. For example, it may be used for filtering water or other liquids to remove impurities or organic solvents in the liquid, or may be used as a deodorant by adsorbing a fluorine-based or chlorine-based gas. .
【００１１】また、この空洞炭素１は次のようにして得
られる。すなわち、まず、粒径が０．１〜５０μｍの炭
素粉末と、粒径が１〜１００μｍの樹脂粒子、例えばポ
リエチレンの粉末とを混合し、ジェットミル，ボールミ
ル，ハイブリダイザー等により高衝撃処理を施す。ハイ
ブリダイザーを使用する場合には、周速度を４０〜１２
０ｍ／秒に設定し、１〜１０分間処理する。The hollow carbon 1 is obtained as follows. That is, first, carbon powder having a particle size of 0.1 to 50 μm and resin particles having a particle size of 1 to 100 μm, for example, polyethylene powder are mixed and subjected to high impact treatment by a jet mill, a ball mill, a hybridizer, or the like. . When using a hybridizer, set the peripheral speed to 40 to 12
Set to 0 m / sec and process for 1 to 10 minutes.
【００１２】これによりポリエチレンの表面に炭素粉末
が付着する。この炭素粉末が付着したポリエチレンを、
窒素やアルゴン等の不活性ガス雰囲気下で４００℃〜１
０００℃の温度で１〜１０時間加熱処理する。これによ
って、ポリエチレンが蒸発除去され、中心部に空洞２が
形成された空洞炭素１が得られる。Thus, the carbon powder adheres to the surface of the polyethylene. The polyethylene with this carbon powder attached
400 ° C to 1 in an atmosphere of inert gas such as nitrogen or argon
Heat treatment at a temperature of 000 ° C. for 1 to 10 hours. Thereby, the polyethylene is evaporated and the hollow carbon 1 in which the hollow 2 is formed in the center is obtained.
【００１３】この場合、ホストとなるポリエチレンの形
状を適宜選択することにより、球状，四角柱，テトラ
型，棒型などの空洞炭素を製造することができる。ま
た、ポリエチレンの大きさを変えることにより、粒径の
異なる空洞炭素を製造することもでき、高衝撃処理の条
件や原料の炭素粉末の量または混合比率を変えることに
より、空洞炭素の肉厚を調整することも可能である。さ
らに、炭素粉末の粒径を変えることにより、表面がポー
ラスな空洞炭素にすることもできる。In this case, by appropriately selecting the shape of the polyethylene serving as the host, hollow carbon having a spherical shape, a square prism, a tetra type, a rod type, etc. can be produced. Also, by changing the size of polyethylene, it is possible to produce hollow carbon with a different particle size, and by changing the conditions of high impact treatment and the amount or mixing ratio of the raw carbon powder, the thickness of the hollow carbon can be reduced. Adjustments are also possible. Further, by changing the particle size of the carbon powder, it is also possible to make the surface of the carbon carbon porous.
【００１４】なお、原料である炭素粉末の種類は特に限
定されず、黒鉛結晶の発達したもの、低黒鉛性炭素のい
ずれも好適である。例えば、アセチレンブラック，ケッ
チェンブラックなどのカーボンブラック、天然黒鉛、人
造黒鉛、コークス、難黒鉛性炭素、ピッチ系炭素繊維、
気相成長炭素繊維等が使用できる。また、直径が５ｎｍ
〜２００ｎｍ、長さが５０ｎｍ〜５μｍの極めて微細な
炭素繊維（通常、アーク放電や遷移金属粒子を触媒とす
る炭化水素の気相分解で生成する）を使用することもで
きる。これによると、繊維が絡み合ってできる編目状多
孔質の空洞炭素となり、強度的にも強くなる。The type of the carbon powder as the raw material is not particularly limited, and any of those having developed graphite crystals and low-graphitic carbon are suitable. For example, carbon black such as acetylene black and Ketjen black, natural graphite, artificial graphite, coke, non-graphitizable carbon, pitch-based carbon fiber,
Vapor-grown carbon fibers can be used. In addition, the diameter is 5 nm
Extremely fine carbon fibers of up to 200 nm and a length of 50 nm to 5 μm (usually produced by arc discharge or gas phase decomposition of hydrocarbons catalyzed by transition metal particles) can also be used. According to this, it becomes a stitch-like porous hollow carbon formed by intertwining the fibers, and the strength is also increased.
【００１５】樹脂粒子としては、加熱により分解や蒸発
するものが好ましく、ポリエチレン以外では、ポリスチ
レン等も使用できる。また、その他の材料としては、有
機溶剤や酸に溶けるものが使用可能である。例えば、ナ
イロン，ポリ塩化ビニル，ポリ塩化ビニリデン，ポリフ
ッ化ビニリデン等である。これらを用いる場合、その樹
脂粒子を炭素粉末と衝撃処理したのち溶剤中で洗浄し、
樹脂粒子のみを溶解させる。そして、濾過をすることに
より空洞炭素が得られる。As the resin particles, those which decompose or evaporate by heating are preferable. In addition to polyethylene, polystyrene and the like can be used. Other materials that can be dissolved in an organic solvent or an acid can be used. For example, nylon, polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride and the like. When these are used, the resin particles are subjected to an impact treatment with carbon powder and then washed in a solvent,
Dissolve only the resin particles. Then, hollow carbon is obtained by filtration.
【００１６】このようにして得られる空洞炭素１を吸着
剤や濾過剤として使用すると、表面だけでなく空洞２の
壁面や、処理されるものによっては空洞２の内部にも除
去されるものが吸着するようになる。したがって、内部
が詰まった単なる球状の炭素と比較して、吸着効果は大
幅に改良される。When the thus obtained hollow carbon 1 is used as an adsorbent or a filter, not only the surface but also the wall surface of the hollow 2 and, depending on the material to be treated, the removed carbon 1 is adsorbed. I will be. Thus, the adsorption effect is greatly improved as compared to mere spherical carbon with a solid interior.
【００１７】また、吸着しようとする対象物が比較的大
きな粒子である場合には、図３および図４に示すよう
に、空洞炭素４の表面と空洞５の間に孔６を設けること
が好ましい。これによって、対象粒子が孔６を通って空
洞炭素４の空洞５内に浸入して溜まり吸着効果が増すよ
うになる。この場合、微細な対象物も空洞炭素４の表面
や空洞５の壁面に付着する。When the object to be adsorbed is a relatively large particle, it is preferable to provide a hole 6 between the surface of the hollow carbon 4 and the hollow 5 as shown in FIGS. . As a result, the target particles penetrate into the cavity 5 of the cavity carbon 4 through the holes 6 and accumulate there, thereby increasing the adsorption effect. In this case, a fine object also adheres to the surface of the hollow carbon 4 and the wall surface of the hollow 5.
【００１８】この孔６を設ける方法としては、樹脂粒子
に加熱により蒸発するものを用い、その樹脂粒子の蒸発
速度を速くする方法がある。例えば、樹脂粒子がポリエ
チレンの場合、一分間に１００℃上昇させるといった急
激な昇温速度で、常温から４００℃〜５００℃になるま
で加熱する。これによって、孔６を有する空洞炭素４が
得られる。また、蒸発や溶解によって樹脂粒子を除去し
たのち、再度、ボールミルやハイブリダイザー等を用い
て衝撃処理を行うことによっても孔６を設けることがで
きる。As a method for providing the holes 6, there is a method in which a resin particle is evaporated by heating, and the evaporation speed of the resin particle is increased. For example, when the resin particles are polyethylene, heating is performed from a normal temperature to 400 ° C. to 500 ° C. at a rapid temperature rising rate such as 100 ° C./min. Thereby, the hollow carbon 4 having the holes 6 is obtained. Alternatively, the holes 6 can also be provided by removing the resin particles by evaporation or dissolution and then performing an impact treatment again using a ball mill, a hybridizer, or the like.
【００１９】さらに、上記空洞炭素１にリチウムを吸蔵
させ、これをリチウム電池の負極材料として使用するこ
ともできる。この場合、空洞炭素１そのものおよび空洞
２内にもリチウムが含有されるようになり、その量は従
来技術のものと比較して大幅に増加する。また、空洞炭
素１の表面は黒鉛等の炭素層で覆われているため、リチ
ウムの析出がなく安全性の高い材料となる等、リチウム
電池の負極材料として好適である。この場合、微細孔３
は特に必要なく、むしろこのような微細孔３が形成され
ないようにして空洞炭素を製造する方が好ましい。Further, lithium can be stored in the hollow carbon 1 and used as a negative electrode material of a lithium battery. In this case, lithium is contained also in the cavity carbon 1 itself and the cavity 2, and the amount thereof is greatly increased as compared with the prior art. In addition, since the surface of the hollow carbon 1 is covered with a carbon layer such as graphite, it is suitable as a negative electrode material of a lithium battery, for example, it is a material having high safety without precipitation of lithium. In this case, the fine holes 3
Is not particularly necessary, but rather it is preferable to produce the hollow carbon so that such micropores 3 are not formed.
【００２０】次に、実施例により本発明をさらに具体的
に説明する。Next, the present invention will be described more specifically with reference to examples.
【００２１】[0021]
【実施例】実施例１ まず、下記の条件で炭素繊維の作製をした。直径２μ
ｍ、長さ１００μｍの気相成長炭素繊維を３０００℃の
アルゴンガス雰囲気中で３０分間、黒鉛化処理をして黒
鉛化気相成長炭素繊維を得た。この炭素繊維の比表面積
は０．５ｍ2 ／ｇであり、Ｘ線回析による（００２）面
の面間隔距離ｄ002 は０．３３６０ｎｍで、Ｃ軸方向の
黒鉛結晶子の大きさＬｃは１００ｎｍであった。EXAMPLE 1 First, carbon fibers were produced under the following conditions. 2μ diameter
The vapor-grown carbon fiber having a length of 100 μm and a length of 100 μm was graphitized in an argon gas atmosphere at 3000 ° C. for 30 minutes to obtain a graphitized vapor-grown carbon fiber. The specific surface area of this carbon fiber is 0.5 m 2 / g, lattice spacing distance d 002 of the X-ray diffraction (002) plane is 0.3360 nm, size Lc in the C-axis direction of the graphite crystallite 100nm Met.
【００２２】この炭素繊維１００ｇに、平均粒径が４０
μｍのポリエチレン粒子（住友精化（株）製のフロービ
ーズ）を１００ｇ加え、ハイブリダイザー（（株）奈良
機械製作所製のＮＨＳ−１）を用いて、周速度１００ｍ
／ｓで２分間高衝撃処理を行った。そして、衝撃処理後
の炭素繊維と樹脂粒子との混合物を分級機（日本ドナル
ドソン（株）製のドナセレック３００型）で分級した。
分級点は１０μｍとし、粗粉側を取り出した。An average particle size of 40 g per 100 g of the carbon fiber
100 g of polyethylene particles (flow beads manufactured by Sumitomo Seika Co., Ltd.) having a peripheral speed of 100 m was added using a hybridizer (NHS-1 manufactured by Nara Machinery Co., Ltd.).
/ S for 2 minutes. Then, the mixture of the carbon fibers and the resin particles after the impact treatment was classified using a classifier (Donacerec 300, manufactured by Nippon Donaldson KK).
The classification point was 10 μm, and the coarse powder side was taken out.
【００２３】分級して得られた前記粗粉側粉末を原料と
して、６００℃の窒素雰囲気中で１時間加熱処理をして
ポリエチレン粒子を分解蒸発させて除去し空洞炭素を得
た。この空洞炭素は、形状が球状で、粒径が５０μｍ、
肉厚が１０μｍ、真密度が２．１ｇ／ｃｍ3 であった。
なお、真密度は、ＪＩＳＲ７６０１−１９８６に記載の
液置換法により測定した。Using the above-mentioned coarse powder side powder obtained as a raw material as a raw material, heat treatment was performed in a nitrogen atmosphere at 600 ° C. for 1 hour to decompose and evaporate polyethylene particles to remove them, thereby obtaining hollow carbon. This hollow carbon has a spherical shape, a particle size of 50 μm,
The wall thickness was 10 μm and the true density was 2.1 g / cm 3 .
The true density was measured by a liquid replacement method described in JISR7601-1986.
【００２４】次に、上記のようにして得られた空洞炭素
を用いて次の方法で充放電試験による評価を行った。ま
ず、バインダーであるポリフッ化ビニリデン０．１ｇを
Ｎ−メチルピロリドン１ｍｌに溶解した。これに前記空
洞炭素を０．９ｇ加え乳鉢中で十分混合した。そして、
この混合物を幅１０ｎｍ、長さ５０ｎｍのニッケルメッ
シュに塗布（塗布面積は１ｃｍ2 ）し、１１０℃で２４
時間乾燥した。Next, the hollow carbon obtained as described above was evaluated by a charge / discharge test by the following method. First, 0.1 g of polyvinylidene fluoride as a binder was dissolved in 1 ml of N-methylpyrrolidone. 0.9 g of the hollow carbon was added thereto, and the mixture was sufficiently mixed in a mortar. And
This mixture was applied to a nickel mesh having a width of 10 nm and a length of 50 nm (application area: 1 cm 2 ).
Dried for hours.
【００２５】ついで、これを作用極とし、金属リチウム
を対極および参照極とした３電極式のガラスビーカーセ
ルを作製した。電解液には、ＬｉＣｌＯ４を１モル／ｌ
の濃度になるようにエチレンカーボネートとジエチルカ
ーボネートからなる混合溶媒（体積比１：１）に溶解し
たものを用いた。つぎに、電流密度を３０ｍＡ／ｇ−ｃ
ａｒｂｏｎとし、作用極と参照極間の電位差が０〜２．
５Ｖの範囲で充放電試験を行った。そして、１サイクル
目の放電容量（リチウムを空洞炭素電極から放出可能な
電気化学的容量）を求めた。その結果は６００ｍＡｈ／
ｇ−ｃａｒｂｏｎであった。Next, a three-electrode glass beaker cell using this as a working electrode and metallic lithium as a counter electrode and a reference electrode was prepared. LiClO4 was 1 mol / l in the electrolyte.
Used in a mixed solvent of ethylene carbonate and diethyl carbonate (volume ratio 1: 1) so as to have a concentration of 1: 1. Next, the current density was set to 30 mA / g-c.
The potential difference between the working electrode and the reference electrode is 0 to 2.
A charge / discharge test was performed in a range of 5V. Then, the discharge capacity in the first cycle (electrochemical capacity capable of releasing lithium from the hollow carbon electrode) was determined. The result was 600 mAh /
g-carbon.
【００２６】実施例２ 平均粒径が１５μｍの人造黒鉛粉末（ロンザ製、ＫＳ−
１５）をボールミルにより粒径０．３μｍになるまで粉
砕したもの１００ｇと、平均粒径４０μｍのポリフッ化
ビニリデンビーズ１５０ｇを、前記ハイブリダイザーを
用い、周速度６０ｍ／秒で３分間処理した。この処理
後、得られた混合物に１リットルのＮ−メチル−２−ピ
ロリドンを加え、１時間撹拌させてポリフッ化ビニリデ
ンビーズをＮ−メチル−２−ピロリドン中に溶解させ
た。Example 2 An artificial graphite powder having an average particle size of 15 μm (manufactured by Lonza, KS-
15) was pulverized by a ball mill to a particle diameter of 0.3 μm, and 100 g of polyvinylidene fluoride beads having an average particle diameter of 40 μm were treated with the hybridizer at a peripheral speed of 60 m / sec for 3 minutes. After this treatment, 1 liter of N-methyl-2-pyrrolidone was added to the obtained mixture, and the mixture was stirred for 1 hour to dissolve the polyvinylidene fluoride beads in N-methyl-2-pyrrolidone.
【００２７】次に、濾過をしてＮ−メチル−２−ピロリ
ドン溶液を除去した。この操作を３回繰り返し、完全に
ポリフッ化ビニリデンビーズを除去して空洞炭素を得
た。得られた空洞炭素は球状であり、その平均粒径は６
０μｍで、肉厚は２０μｍ、真密度は２．２ｇ／ｃｍ3
であった。また、その放電容量は、前記実施例１の空洞
炭素と略等しかった。Next, the solution was filtered to remove the N-methyl-2-pyrrolidone solution. This operation was repeated three times to completely remove the polyvinylidene fluoride beads to obtain hollow carbon. The obtained hollow carbon is spherical, and its average particle size is 6
0 μm, wall thickness 20 μm, true density 2.2 g / cm 3
Met. Further, the discharge capacity was substantially equal to that of the hollow carbon of Example 1.
【００２８】[0028]
【発明の効果】以上のように、この発明に係る空洞炭素
は内部に空洞が構成されているため、空洞の壁面も吸着
面となる。その結果、吸着面積を大幅に増加することが
でき、吸着効果が大幅に向上するようになる。また、空
洞内に、リチウムを吸蔵させることによりリチウムの吸
蔵量が大幅に増え、リチウム電池の負極に利用すること
が好適なものとなる。As described above, since the hollow carbon according to the present invention has a cavity therein, the wall surface of the cavity also serves as an adsorption surface. As a result, the suction area can be greatly increased, and the suction effect can be greatly improved. Further, by storing lithium in the cavity, the amount of stored lithium is greatly increased, which makes it suitable for use as a negative electrode of a lithium battery.
【００２９】さらに、この空洞炭素は、炭素粉末と樹脂
粒子を混合して樹脂粒子の表面に炭素粉末を付着させた
のち加熱処理して樹脂粒子を蒸発除去することにより、
簡単な方法で空洞炭素を得ることができ、かつ、その形
状，大きさ，孔の大小等も材料を変えることにより適宜
任意のものに変更することができる。Further, the hollow carbon is obtained by mixing carbon powder and resin particles, adhering the carbon powder to the surface of the resin particles, and then performing heat treatment to evaporate and remove the resin particles.
The hollow carbon can be obtained by a simple method, and the shape, size, size of pores, etc. can be appropriately changed by changing the material.
【図１】この発明の一実施形態による空洞炭素を示す正
面図。FIG. 1 is a front view showing hollow carbon according to an embodiment of the present invention.
【図２】図１の断面図。FIG. 2 is a sectional view of FIG.
【図３】この発明の他の実施形態による空洞炭素を示す
正面図。FIG. 3 is a front view showing a hollow carbon according to another embodiment of the present invention.
【図４】図３の断面図。FIG. 4 is a sectional view of FIG. 3;
１，４・・・・・空洞炭素 ２，５・・・・・空洞 1,4 ... cavity carbon 2,5 ... cavity
Claims (3)
成されていることを特徴とする空洞炭素。1. A hollow carbon comprising a molded body of carbon powder and having a cavity formed therein.
１に記載の空洞炭素。2. The hollow carbon according to claim 1, wherein lithium is stored in the hollow.
表面に炭素粉末を付着させたのち加熱処理して樹脂粒子
を蒸発除去するかまたは樹脂粒子を溶解可能な溶剤を用
いて樹脂粒子を溶解除去することを特徴とする空洞炭素
の製造方法。3. A method in which carbon powder and resin particles are mixed to adhere the carbon powder to the surface of the resin particles and then heat-treated to evaporate and remove the resin particles, or using a solvent capable of dissolving the resin particles. A method for producing hollow carbon, wherein the carbon is dissolved and removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10095391A JPH11268907A (en) | 1998-03-23 | 1998-03-23 | Cavity carbon and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10095391A JPH11268907A (en) | 1998-03-23 | 1998-03-23 | Cavity carbon and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11268907A true JPH11268907A (en) | 1999-10-05 |
Family
ID=14136358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10095391A Pending JPH11268907A (en) | 1998-03-23 | 1998-03-23 | Cavity carbon and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11268907A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1164108A1 (en) * | 2000-06-13 | 2001-12-19 | Toda Kogyo Corporation | Hollow carbon particles and process for producing the same |
| WO2004108275A1 (en) * | 2003-06-02 | 2004-12-16 | Nec Corporation | Catalyst support, gas storage body and method for producing these |
| JP2005324975A (en) * | 2004-05-12 | 2005-11-24 | Kitagawa Ind Co Ltd | Granular carbon fiber material, and its manufacturing method |
| JP2007091490A (en) * | 2005-09-27 | 2007-04-12 | Nissin Kogyo Co Ltd | Porous material and method of manufacturing the same |
| JP2007220622A (en) * | 2006-02-20 | 2007-08-30 | Kansai Coke & Chem Co Ltd | Negative electrode material for lithium ion secondary battery, and its manufacturing method |
| WO2010084547A1 (en) * | 2009-01-22 | 2010-07-29 | 独立行政法人産業技術総合研究所 | Hollow carbon microparticle and method for producing same |
| JP2012101950A (en) * | 2010-11-05 | 2012-05-31 | Noritake Co Ltd | Method for producing porous carbon particle, and porous carbon material including the particle |
| JP2012214301A (en) * | 2011-03-31 | 2012-11-08 | Sekisui Plastics Co Ltd | Hollow carbon particle and method for producing the same |
| US9321649B2 (en) | 2007-12-03 | 2016-04-26 | National Institute Of Advanced Industrial Science And Technology | Carbon microparticle having lignin as raw material and preparation method therefor |
-
1998
- 1998-03-23 JP JP10095391A patent/JPH11268907A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1164108A1 (en) * | 2000-06-13 | 2001-12-19 | Toda Kogyo Corporation | Hollow carbon particles and process for producing the same |
| WO2004108275A1 (en) * | 2003-06-02 | 2004-12-16 | Nec Corporation | Catalyst support, gas storage body and method for producing these |
| JP2005324975A (en) * | 2004-05-12 | 2005-11-24 | Kitagawa Ind Co Ltd | Granular carbon fiber material, and its manufacturing method |
| JP2007091490A (en) * | 2005-09-27 | 2007-04-12 | Nissin Kogyo Co Ltd | Porous material and method of manufacturing the same |
| JP2007220622A (en) * | 2006-02-20 | 2007-08-30 | Kansai Coke & Chem Co Ltd | Negative electrode material for lithium ion secondary battery, and its manufacturing method |
| US9321649B2 (en) | 2007-12-03 | 2016-04-26 | National Institute Of Advanced Industrial Science And Technology | Carbon microparticle having lignin as raw material and preparation method therefor |
| WO2010084547A1 (en) * | 2009-01-22 | 2010-07-29 | 独立行政法人産業技術総合研究所 | Hollow carbon microparticle and method for producing same |
| JP2010168251A (en) * | 2009-01-22 | 2010-08-05 | National Institute Of Advanced Industrial Science & Technology | Hollow carbon fine particle and process for producing the same |
| US8986838B2 (en) | 2009-01-22 | 2015-03-24 | National Institute Of Advanced Industrial Science And Technology | Hollow carbon microparticle and method for producing same |
| JP2012101950A (en) * | 2010-11-05 | 2012-05-31 | Noritake Co Ltd | Method for producing porous carbon particle, and porous carbon material including the particle |
| JP2012214301A (en) * | 2011-03-31 | 2012-11-08 | Sekisui Plastics Co Ltd | Hollow carbon particle and method for producing the same |
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