JP2002313686A - Manufacturing method of electric double-layer capacitor - Google Patents
Manufacturing method of electric double-layer capacitorInfo
- Publication number
- JP2002313686A JP2002313686A JP2001117760A JP2001117760A JP2002313686A JP 2002313686 A JP2002313686 A JP 2002313686A JP 2001117760 A JP2001117760 A JP 2001117760A JP 2001117760 A JP2001117760 A JP 2001117760A JP 2002313686 A JP2002313686 A JP 2002313686A
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- Japan
- Prior art keywords
- activated carbon
- electric double
- layer capacitor
- manufacturing
- per
- Prior art date
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】 本発明は、電気二重層コン
デンサの製造方法に関する。[0001] The present invention relates to a method for manufacturing an electric double layer capacitor.
【０００２】[0002]
【従来の技術】 電気二重層コンデンサは、ファラッド
級の大容量を有し、充放電サイクル特性にも優れること
から、電子機器のバックアップ電源や自動車を始めとし
た各種輸送機のバッテリーとして用いられている他、エ
ネルギーの有効利用の観点からは、夜間電力の貯蔵とい
った用途での使用も検討されている。2. Description of the Related Art Electric double layer capacitors have a farad-class large capacity and excellent charge / discharge cycle characteristics, and are therefore used as backup power supplies for electronic equipment and batteries for various transport vehicles such as automobiles. In addition, from the viewpoint of effective use of energy, use in applications such as storage of nighttime power is also being considered.
【０００３】 上記電気二重層コンデンサは、例えば、
図３に示すように、有機電解液４８に、分極性電極４２
を集電体４０に密着させた正極１８及び負極１９との間
に、セパレータ４４を介在させた電極体４５を、ケース
４６内で浸漬されてなるものである。[0003] The electric double layer capacitor is, for example,
As shown in FIG. 3, the polarizable electrode 42 is
An electrode body 45 having a separator 44 interposed between a positive electrode 18 and a negative electrode 19, which is in close contact with a current collector 40, is immersed in a case 46.
【０００４】 このとき、上記分極性電極は、粉末状活
性炭又は繊維状活性炭を主成分とするものであり、上記
活性炭の特性値として比表面積が知られていた。At this time, the polarizable electrode is mainly composed of powdered activated carbon or fibrous activated carbon, and the specific surface area has been known as a characteristic value of the activated carbon.
【０００５】 しかしながら、大きな比表面積の活性炭
を適用しても必ずしも高容量密度の電気二重層コンデン
サを得ることができないことが知られている（森本，平
塚，真田ら，電気化学，６３，５８９（１９９５））。
従って、高容量密度化を図るために、高比表面積の活性
炭を用いても特性が不十分であったり、ばらつきが生じ
るため、安定した高容量密度の電気二重層コンデンサを
得ることが困難であった。However, it is known that even if activated carbon having a large specific surface area is applied, an electric double layer capacitor having a high capacitance density cannot always be obtained (Morimoto, Hiratsuka, Sanada et al., Electrochemistry, 63, 589 ( 1995)).
Therefore, even if activated carbon having a high specific surface area is used in order to increase the capacity density, the characteristics are insufficient or variations occur, so that it is difficult to obtain a stable electric double layer capacitor having a high capacity density. Was.
【０００６】[0006]
【発明が解決しようとする課題】 本発明は、このよう
な従来技術の有する課題を鑑みてなされたものであり、
その目的とするところは、高容量密度化が可能で、且つ
特性の安定した電気二重層コンデンサの製造方法を提供
するものである。SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the related art,
It is an object of the present invention to provide a method for manufacturing an electric double layer capacitor capable of achieving a high capacity density and having stable characteristics.
【０００７】[0007]
【課題を解決するための手段】 即ち、本発明によれ
ば、有機電解液中に、粉末状又は繊維状である活性炭を
主成分とする分極性電極、セパレータ及び集電体からな
る電極体が浸漬された電気二重層コンデンサの製造方法
であって、窒素吸着より求めた活性炭１ｇ当たりの全細
孔体積をＶTP、炭素の真密度をＤCとして、ＤCが２ｇ／
ｃｃ時における活性炭１ｇ当たりの見掛け体積ＶACを、
ＶAC＝ＶTP＋１／ＤCなる式で算出した後、窒素吸着よ
り求めた細孔直径が０．８〜１ｎｍの範囲にある活性炭
１ｇ当たりの細孔体積ＶPとし、Ｘ＝ＶP／ＶACなる式で
算出した特性値Ｘが、０．３以上である活性炭を分極性
電極に用いることを特徴とする電気二重層コンデンサの
製造方法が提供される。Means for Solving the Problems According to the present invention, a polarizable electrode mainly composed of activated carbon in powder or fibrous form, an electrode body composed of a separator and a current collector are provided in an organic electrolytic solution. A method for producing an immersed electric double layer capacitor, wherein the total pore volume per 1 g of activated carbon determined by nitrogen adsorption is V TP , and the true density of carbon is D C , where D C is 2 g /
the apparent volume V AC per activated carbon 1g at the time of cc,
After calculating at V AC = V TP + 1 / D C becomes ## wherein the pore diameter determined from the nitrogen adsorption and a pore volume V P per activated carbon 1g in the range of 0.8~1nm, X = V P / V AC becomes calculated characteristic value X in the expression method of the electric double layer capacitor, which comprises using activated carbon is 0.3 or more in the polarizable electrode.
【０００８】[0008]
【発明の実施の形態】 本発明の電気二重層コンデンサ
の製造方法は、窒素吸着より求めた活性炭１ｇ当たりの
全細孔体積をＶTP、炭素の真密度をＤCとして、ＤCが２
ｇ／ｃｃ時における活性炭１ｇ当たりの見掛け体積ＶAC
を、ＶAC＝ＶTP＋１／ＤCなる式で算出した後、窒素吸
着より求めた細孔直径が０．８〜１ｎｍの範囲にある活
性炭１ｇ当たりの細孔体積ＶPとし、Ｘ＝ＶP／ＶACなる
式で算出した活性炭の特性値Ｘが、０．３以上（より好
ましくは、０．３５以上）である活性炭を分極性電極に
用いることにある。これにより、従来の比表面積による
活性炭の評価方法と比較して、本発明で提案する活性炭
の特性値Ｘが、電気二重層コンデンサの体積静電容量密
度との間で比例関係が成立するため、体積静電容量密度
を大きな、即ちエネルギー密度が大きく、実用的に好適
な電気二重層コンデンサをばらつきなく製造することが
できる。BEST MODE FOR CARRYING OUT THE INVENTION In the method for producing an electric double layer capacitor of the present invention, the total pore volume per 1 g of activated carbon determined by nitrogen adsorption is V TP , the true density of carbon is D C , and D C is 2
apparent volume V AC per activated carbon 1g at the time of g / cc
Is calculated by the formula of V AC = V TP + 1 / D C , and the pore volume per 1 g of activated carbon having a pore diameter in the range of 0.8 to 1 nm obtained by nitrogen adsorption is defined as X P, and X = V characteristic value X of the activated carbon was calculated by P / V AC becomes expression is 0.3 or more (more preferably, 0.35 or more) in the use of activated carbon is in the polarizable electrode. Thereby, compared with the conventional method for evaluating activated carbon based on the specific surface area, the characteristic value X of the activated carbon proposed in the present invention has a proportional relationship with the volume capacitance density of the electric double layer capacitor. An electric double layer capacitor having a large volume capacitance density, that is, a large energy density, and practically suitable can be manufactured without variation.
【０００９】 ここで、本発明で用いる活性炭は、部分
的に酸化させた黒鉛類似の微結晶炭素を有する炭素材料
であり、その形状が粉体状又は繊維状であることが好ま
しい。Here, the activated carbon used in the present invention is a carbon material having partially oxidized graphite-like microcrystalline carbon, and its shape is preferably powdery or fibrous.
【００１０】 尚、本発明で用いる活性炭について詳細
に説明する。まず、本発明の活性炭の作製にあたって
は、先ず、石油コークス、石炭コークス、石油ピッチ
（タール）、石炭ピッチ（タール）、フェノール樹脂、
メソフェーズカーボン、ポリ塩化ビニル、ポリ塩化ビニ
リデン、ポリイミド、ヤシガラ、大鋸屑等の有機材料
を、不活性ガス雰囲気中で、約７００℃〜１０００℃の
温度範囲で熱処理し、炭化材料を得る。これらの有機材
料は、１種類を単独で用いてもよく、また複数種の混合
物として用いてもよい。不活性ガスとしては、窒素ガス
やアルゴンガス、ヘリウムガスといった希ガスが好適に
用いられる。The activated carbon used in the present invention will be described in detail. First, in producing the activated carbon of the present invention, first, petroleum coke, coal coke, petroleum pitch (tar), coal pitch (tar), phenol resin,
An organic material such as mesophase carbon, polyvinyl chloride, polyvinylidene chloride, polyimide, coconut husk, and sawdust is heat-treated in an inert gas atmosphere at a temperature in the range of about 700C to 1000C to obtain a carbonized material. One of these organic materials may be used alone, or a mixture of two or more thereof may be used. As the inert gas, a rare gas such as a nitrogen gas, an argon gas, or a helium gas is suitably used.
【００１１】 次に、得られた粉末状又は繊維状の炭化
材料を賦活（部分酸化）することにより、本発明で用い
る活性炭を得ることができる。ここで、賦活（部分酸
化）の方法としては、水蒸気や空気や酸素等の酸化性ガ
スによる熱処理や、塩化亜鉛等を用いた薬品酸化方法の
他、アルカリ金属および酸素元素を含む含酸素アルカリ
化合物（以下、「アルカリ金属等」という。）の少なく
とも１種と共に、不活性ガス雰囲気中で熱処理する酸化
方法を挙げることができる。Next, activated carbon used in the present invention can be obtained by activating (partially oxidizing) the obtained powdered or fibrous carbonized material. Here, the activation (partial oxidation) method includes a heat treatment using an oxidizing gas such as steam, air, or oxygen, a chemical oxidation method using zinc chloride or the like, and an oxygen-containing alkali compound containing an alkali metal and an oxygen element. (Hereinafter referred to as "alkali metal") may be oxidized by heat treatment in an inert gas atmosphere.
【００１２】 アルカリ金属元素としては、カリウム、
ナトリウム、リチウムが好適に用いられ、これらアルカ
リ金属の含酸素化合物としては、水酸化カリウム、水酸
化ナトリウム等の水酸化物や炭酸カリウム、炭酸ナトリ
ウム等の炭酸塩が好適に用いられる。これらのアルカリ
金属等は、複数種を混合して用いてもよい。As the alkali metal element, potassium,
Sodium and lithium are preferably used. As the oxygen-containing compound of these alkali metals, hydroxides such as potassium hydroxide and sodium hydroxide and carbonates such as potassium carbonate and sodium carbonate are preferably used. These alkali metals and the like may be used as a mixture of two or more kinds.
【００１３】 上記炭化材料は、こうして熱処理された
後、必要に応じてメタノールやエタノール等のアルコー
ル系溶媒や水等を用いて、洗浄、濾過、乾燥して単離す
ることにより、本発明で用いる活性炭を得ることができ
る。The above-mentioned carbonized material is used in the present invention by being heat-treated in this manner, and then, if necessary, by washing, filtering, drying and isolating using an alcoholic solvent such as methanol or ethanol, water or the like. Activated carbon can be obtained.
【００１４】 尚、本発明で用いる分極性電極は、上記
で得られた粉末状又は繊維状の活性炭に、カーボンブラ
ック等の導電材や有機バインダを添加し、混合・混練
し、シート状に成形したものである。集電体は、表面を
エッチング処理したアルミ箔を好適に用いることができ
る。電極端子は、電気伝導性と電解液に対する安定性か
ら高純度アルミニウムを好適に用いることができる。セ
パレータは、コンデンサ用の紙セパレータや、ポリエチ
レン、ポリプロピレン、ポリテトラフルオロエチレン製
の多孔性樹脂フィルムを用いることができる。The polarizable electrode used in the present invention is obtained by adding a conductive material such as carbon black or an organic binder to the powdery or fibrous activated carbon obtained above, mixing and kneading the resultant, and forming the sheet into a sheet. It was done. As the current collector, an aluminum foil whose surface has been subjected to an etching treatment can be suitably used. For the electrode terminal, high-purity aluminum can be suitably used from the viewpoint of electric conductivity and stability against an electrolytic solution. As the separator, a paper separator for a capacitor or a porous resin film made of polyethylene, polypropylene, or polytetrafluoroethylene can be used.
【００１５】 また、本発明で用いる電解液は、キャパ
シタとして耐電圧が高くエネルギー密度を大きくできる
有機系電解液が好ましい。有機系電解液の溶媒として
は、プロピレンカーボネート、γ−ブチルラクトン、エ
チレンカーボネート、ジメチルカーボネート、ジエチル
カーボネート、エチルメチルカーボネート、スルホラン
があり、これらを単独で、あるいは、複数種混合した
り、この他の溶媒や界面活性剤等の添加剤を加えた溶媒
が好適に用いられる。電解質としては、４級アンモニウ
ム塩、例えば、テトラエチルアンモニウム、テトラブチ
ルアンモニウム、トリエチルメチルアンモニウムの４フ
ッ化ホウ素塩または６フッ化リン酸塩、あるいは、４級
ホスホニウムの４フッ化ホウ素塩または６フッ化リン酸
塩などを用いることができる。The electrolytic solution used in the present invention is preferably an organic electrolytic solution having a high withstand voltage and a high energy density as a capacitor. Examples of the solvent for the organic electrolyte include propylene carbonate, γ-butyl lactone, ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, and sulfolane.These may be used alone or in combination of two or more. A solvent to which an additive such as a solvent or a surfactant is added is suitably used. As the electrolyte, a quaternary ammonium salt, for example, tetrafluoroammonium, tetrabutylammonium, triethylmethylammonium boron tetrafluoride or hexafluorophosphate, or a quaternary phosphonium boron tetrafluoride or hexafluoride A phosphate or the like can be used.
【００１６】[0016]
【実施例】 以下、本発明を実施例に基づいて更に詳細
に説明するが、本発明はこれらの実施例に限定されるも
のではない。 （実施例１〜６、比較例１〜３）表１に示す原料の炭化
物を、表１に示す特性値Ｘになるように賦活することに
より、活性炭Ａ〜Ｉを作製した。尚、特性値Ｘは、活性
炭１ｇ当たりの全細孔体積ＶTP並びに０．８〜１ｎｍの
細孔体積ＶPは、米国マイクロメリテックス社製ＡＳＡ
Ｐ２０００を用いて、窒素の等温吸着線を測定し、ＭＰ
法にて評価したものである。また、活性炭Ａ〜Ｉの比表
面積は、米国マイクロメリテックス社製ＤｅＳｏｒｂ２
３００を用い、Ｎ2ＢＥＴ法にて測定した。その結果を
表１に示す。EXAMPLES Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. (Examples 1 to 6, Comparative Examples 1 to 3) Activated carbons A to I were prepared by activating the carbides of the raw materials shown in Table 1 so as to have the characteristic values X shown in Table 1. The characteristic value X, the pore volume V P of the total pore volume V TP and 0.8~1nm per activated carbon 1g is US Micromeritics Tex Corporation ASA
Using P2000, measure the nitrogen isotherm adsorption line,
It was evaluated by the law. The specific surface area of the activated carbons A to I is DeSorb2 manufactured by Micromeritex Corporation in the United States.
With 300, it was measured by N 2 BET method. Table 1 shows the results.
【００１７】 次に、得られた活性炭Ａ〜Ｉを用いて、
活性炭８０重量％、導電剤としてカーボンブラックを１
０重量％、バインダーとしてポリテトラフルオロエチレ
ンを１０重量％混合し、約１５０μｍの厚みの電極シー
トをそれぞれ作製した。Next, using the obtained activated carbons A to I,
80% by weight activated carbon, 1 carbon black as conductive agent
0% by weight and 10% by weight of polytetrafluoroethylene as a binder were mixed to prepare electrode sheets each having a thickness of about 150 μm.
【００１８】 次に、得られた電極シートから打ち抜い
た直径２０ｍｍのディスク２枚を、正負極の分極性電極
とし、厚さ３０μｍのアルミニウム箔を集電体、厚さ２
５μｍの多孔質ポリエチレンフィルムをセパレータとし
て組み合わせ電極体とし、これを有機電解液である１Ｍ
のテトラエチルアンモニウム・テトラフルオロボレート
を溶解したプロピレンカーボネートに含浸させることに
より、電気二重層コンデンサをそれぞれ作製した。Next, two 20 mm-diameter disks punched from the obtained electrode sheet were used as positive and negative polarizable electrodes, and a 30 μm-thick aluminum foil was used as a current collector.
A 5 μm porous polyethylene film was used as a separator to form an electrode assembly, which was used as an organic electrolyte solution of 1M.
Was impregnated with propylene carbonate in which tetraethylammonium / tetrafluoroborate was dissolved to prepare electric double layer capacitors.
【００１９】 得られた電気二重層コンデンサの室温で
の静電容量を、５ｍＡ／ｃｍ2の電流密度で、０〜２．
５Ｖまでの範囲の充放電にて評価した。その結果を表１
に示す。尚、表１に示す体積静電容量密度は、測定され
た静電容量を、正負極の電極シート体積の合計で除した
値である。The capacitance of the obtained electric double layer capacitor at room temperature is measured at a current density of 5 mA / cm 2 from 0 to 2.
Evaluation was made in charge and discharge in a range up to 5V. Table 1 shows the results.
Shown in The volume capacitance density shown in Table 1 is a value obtained by dividing the measured capacitance by the total volume of the positive and negative electrode sheets.
【００２０】[0020]
【表１】 [Table 1]
【００２１】（考察）本発明では、図１に示すように、
電気二重層コンデンサの体積静電容量密度と活性炭の特
性値Ｘとの間に比例関係が成立することを確認した。こ
れにより、特性値Ｘを指標として電気二重層コンデンサ
を製造した場合、電気二重層コンデンサの品質を簡便且
つ確実に維持することができる。また、本発明では、表
１の結果から、特性値Ｘが０．３以上、更に好ましくは
０．３５以上の活性炭（実施例１〜６）を用いることに
より、１０Ｆ／ｃｃ以上の体積静電容量密度を有する、
即ちエネルギー密度が大きく、実用的に好適な電気二重
層コンデンサを製造することができた。一方、従来の方
法では、図２に示すように、体積静電容量密度と比表面
積との相関関係が不十分であるため、比表面積を指標と
して電気二重層コンデンサを製造した場合、体積静電容
量密度が十分でなく、且つばらつきの大きな電気二重層
コンデンサしか製造することができなかった。(Discussion) In the present invention, as shown in FIG.
It was confirmed that a proportional relationship was established between the volume capacitance density of the electric double layer capacitor and the characteristic value X of the activated carbon. Thereby, when the electric double layer capacitor is manufactured using the characteristic value X as an index, the quality of the electric double layer capacitor can be easily and reliably maintained. Further, in the present invention, from the results in Table 1, by using activated carbon having the characteristic value X of 0.3 or more, more preferably 0.35 or more, the volume electrostatic capacity of 10 F / cc or more is obtained. Having a capacity density,
That is, a practically suitable electric double layer capacitor having a high energy density was able to be manufactured. On the other hand, in the conventional method, as shown in FIG. 2, the correlation between the volume capacitance density and the specific surface area is insufficient. Only an electric double-layer capacitor with insufficient capacity density and large variation could be manufactured.
【００２２】[0022]
【発明の効果】 以上の通り、本発明に係る電気二重層
コンデンサの製造方法は、高容量密度化が可能で、且つ
特性の安定した電気二重層コンデンサを得ることができ
る。As described above, the method for manufacturing an electric double-layer capacitor according to the present invention can provide an electric double-layer capacitor having a high capacity density and stable characteristics.
【図１】 電気二重層コンデンサの体積静電容量密度と
活性炭の特性値Ｘとの関係を示すグラフである。FIG. 1 is a graph showing a relationship between a volume capacitance density of an electric double layer capacitor and a characteristic value X of activated carbon.
【図２】 電気二重層コンデンサの体積静電容量密度と
活性炭の比表面積との関係を示すグラフである。FIG. 2 is a graph showing a relationship between a volume capacitance density of an electric double layer capacitor and a specific surface area of activated carbon.
【図３】 電気二重層コンデンサの一例を示す概要図で
ある。FIG. 3 is a schematic diagram showing an example of an electric double layer capacitor.
１８…正極（正電極）、１９…負極（負電極）、４０…
集電体、４２…分極性電極、４４…セパレータ、４５…
電極体、４６…ケース、４８…有機電解液。18 ... Positive electrode (positive electrode), 19 ... Negative electrode (negative electrode), 40 ...
Current collector, 42 ... polarizable electrode, 44 ... separator, 45 ...
Electrode body, 46 ... case, 48 ... organic electrolytic solution.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中村 永植 愛知県名古屋市瑞穂区須田町２番56号 日 本碍子株式会社内 (72)発明者 遠藤 守信 長野県須坂市臥竜１丁目４−８ ──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiue Nakamura 2-56, Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Inside Nihon Insulators Co., Ltd.
Claims (1)
る活性炭を主成分とする分極性電極、セパレータ及び集
電体からなる電極体が浸漬された電気二重層コンデンサ
の製造方法であって、 窒素吸着より求めた活性炭１ｇ当たりの全細孔体積をＶ
TP、炭素の真密度をＤ Cとして、ＤCが２ｇ／ｃｃ時にお
ける活性炭１ｇ当たりの見掛け体積ＶACを、Ｖ AC＝ＶTP
＋１／ＤCなる式で算出した後、窒素吸着より求めた細
孔直径が０．８〜１ｎｍの範囲にある活性炭１ｇ当たり
の細孔体積ＶPとし、Ｘ＝ＶP／ＶACなる式で算出した特
性値Ｘが、０．３以上である活性炭を分極性電極に用い
ることを特徴とする電気二重層コンデンサの製造方法。1. A powdery or fibrous form in an organic electrolytic solution.
Electrodes, separators and collectors based on activated carbon
Electric double-layer capacitor immersed in an electrode body
Wherein the total pore volume per 1 g of activated carbon determined by nitrogen adsorption is V
TP, The true density of carbon is D CAs DCWhen 2g / cc
Volume V per gram of activated carbonACAnd V AC= VTP
+ 1 / DCAfter calculating with the formula
Per 1 g of activated carbon having a pore diameter in the range of 0.8 to 1 nm
Pore volume VPAnd X = VP/ VACCalculated by the following formula
Activated carbon having a property value X of 0.3 or more is used for a polarizable electrode.
A method for manufacturing an electric double layer capacitor, comprising:
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| JP2001117760A JP3792528B2 (en) | 2001-04-17 | 2001-04-17 | Manufacturing method of electric double layer capacitor |
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|---|---|---|---|
| JP2001117760A JP3792528B2 (en) | 2001-04-17 | 2001-04-17 | Manufacturing method of electric double layer capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002313686A true JP2002313686A (en) | 2002-10-25 |
| JP3792528B2 JP3792528B2 (en) | 2006-07-05 |
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| JP2001117760A Expired - Lifetime JP3792528B2 (en) | 2001-04-17 | 2001-04-17 | Manufacturing method of electric double layer capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006252902A (en) * | 2005-03-10 | 2006-09-21 | Kawasaki Heavy Ind Ltd | Hybrid battery |
| CN113959902A (en) * | 2021-09-14 | 2022-01-21 | 陕西创普斯新能源科技有限公司 | Method for measuring true density of lithium iron phosphate powder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9799459B2 (en) | 2014-08-08 | 2017-10-24 | Corning Incorporated | High pore volume utilization carbon and electric double layer capacitor |
-
2001
- 2001-04-17 JP JP2001117760A patent/JP3792528B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006252902A (en) * | 2005-03-10 | 2006-09-21 | Kawasaki Heavy Ind Ltd | Hybrid battery |
| CN113959902A (en) * | 2021-09-14 | 2022-01-21 | 陕西创普斯新能源科技有限公司 | Method for measuring true density of lithium iron phosphate powder |
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| Publication number | Publication date |
|---|---|
| JP3792528B2 (en) | 2006-07-05 |
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