JP6155224B2 - Electrode composite - Google Patents
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- JP6155224B2 JP6155224B2 JP2014099408A JP2014099408A JP6155224B2 JP 6155224 B2 JP6155224 B2 JP 6155224B2 JP 2014099408 A JP2014099408 A JP 2014099408A JP 2014099408 A JP2014099408 A JP 2014099408A JP 6155224 B2 JP6155224 B2 JP 6155224B2
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- 239000002131 composite material Substances 0.000 title claims description 29
- 239000006229 carbon black Substances 0.000 claims description 129
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
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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
- Y02E60/10—Energy storage using batteries
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- Battery Electrode And Active Subsutance (AREA)
Description
本発明は、電極合材に関する。 The present invention relates to an electrode mixture.
電池の電極材としては、例えば、集電体と、複合金属酸化物、導電材、及びバインダー樹脂を含む電極合材によって該集電体上に形成された活物質層と、を有するものが挙げられる。導電材としては、カーボンブラックが広く用いられている。優れた電池性能を得るには、カーボンブラックの導電性付与効果が優れていることが重要である。 Examples of the electrode material for a battery include a current collector and an active material layer formed on the current collector by an electrode mixture containing a composite metal oxide, a conductive material, and a binder resin. It is done. Carbon black is widely used as the conductive material. In order to obtain excellent battery performance, it is important that the conductivity imparting effect of carbon black is excellent.
優れた導電性を有するカーボンブラックとしては、例えば、以下に示すものが知られている。
（ｉ）液状炭化水素（原料油）を、炉内において分子状酸素及び水蒸気の存在下に部分酸化反応させて合成ガスを製造すると同時に得られる、ＤＢＰ吸油量が２９０〜６４０ｃｍ３／１００ｇのカーボンブラック（例えば、特許文献１〜４）。
（ii）液状炭化水素（原料油）を、炉内において分子状酸素及び水蒸気の存在下に部分酸化反応させて合成ガスを製造すると同時に得られる、ＤＢＰ吸油量が４００ｃｍ３／１００ｇ以上で、かつ比表面積が１０００ｍ２／ｇ以上のカーボンブラック（例えば、特許文献５）。
As carbon black which has the outstanding electroconductivity, what is shown below is known, for example.
(I) a liquid hydrocarbon (feedstock), by partial oxidation reaction in the presence of molecular oxygen and water vapor in a furnace to obtain at the same time producing synthesis gas, DBP oil absorption amount of 290~640cm 3 / 100g carbon Black (for example, Patent Documents 1 to 4).
(Ii) liquid hydrocarbons (feedstock), by partial oxidation reaction in the presence of molecular oxygen and water vapor in a furnace to obtain at the same time producing synthesis gas, with a DBP oil absorption 400 cm 3/100 g or more, and Carbon black having a specific surface area of 1000 m 2 / g or more (for example, Patent Document 5).
しかし、前記したようなＤＢＰ吸油量が高く、優れた導電性付与効果を有するカーボンブラックは、溶剤に対する分散性が悪く、電極合材に用いると内部短絡等の不具合が生じやすいという問題がある。
一方、カーボンブラックとしては、アセチレンブラック等の溶剤への分散性に優れるものが知られている。しかし、アセチレンブラック等を用いた場合は導電性付与効果が低く、電極合材に用いると充分な電池性能が得られ難い。
However, carbon black having a high DBP oil absorption amount as described above and having an excellent conductivity imparting property has a problem of poor dispersibility in a solvent and tends to cause problems such as an internal short circuit when used in an electrode mixture.
On the other hand, carbon black having excellent dispersibility in a solvent such as acetylene black is known. However, when acetylene black or the like is used, the conductivity imparting effect is low, and when it is used as an electrode mixture, it is difficult to obtain sufficient battery performance.
本発明は、内部短絡等の不具合が生じ難く、かつ優れた電池性能が得られる電極材を製造できる電極合材を提供する。 The present invention provides an electrode mixture capable of producing an electrode material that is less prone to problems such as an internal short circuit and that provides excellent battery performance.
本発明の電極合材は、下記条件（１）〜（３）を満たすカーボンブラックと、複合金属酸化物と、バインダー樹脂とを含有することを特徴とする。
（１）ＢＥＴ比表面積が３５０〜６５０ｍ２／ｇである。
（２）ＤＢＰ吸油量が２７０〜３４０ｃｍ３／１００ｇである。
（３）ＪＩＳ Ｋ６２１７−６に記載の凝集体径の測定方法により測定される、モード径（Ｄｍｏｄ）に対するＤ９０径（Ｄ９０）の比Ｄ９０／Ｄｍｏｄが１．９０〜２．２０である。
The electrode composite of the present invention is characterized by containing carbon black satisfying the following conditions (1) to (3), a composite metal oxide, and a binder resin.
(1) A BET specific surface area is 350 to 650 m 2 / g.
(2) DBP oil absorption is 270-340 cm < 3 > / 100g.
(3) The ratio D 90 / D mod of the D90 diameter (D 90 ) to the mode diameter (D mod ) measured by the method for measuring an aggregate diameter described in JIS K6217-6 is 1.90 to 2.20. is there.
本発明の電極合材を用いれば、内部短絡等の不具合が生じ難く、かつ優れた電池性能が得られる電極材を製造できる。 By using the electrode mixture of the present invention, it is possible to produce an electrode material that is less prone to problems such as an internal short circuit and that provides excellent battery performance.
本発明の電極合材は、例えば非水系電池の電極材の形成に用いられる電極合材であって、カーボンブラックと、複合金属酸化物と、バインダー樹脂と、を含有する。 The electrode mixture of the present invention is an electrode mixture used for forming an electrode material for a non-aqueous battery, for example, and contains carbon black, a composite metal oxide, and a binder resin.
［カーボンブラック］
カーボンブラックは、下記条件（１）〜（３）を満たす。下記条件（１）〜（３）を満たすカーボンブラックは、溶剤等への分散性が良好であり、また導電性付与効果が良好で優れた電池性能を実現できる。
（１）ＢＥＴ比表面積が３５０〜６５０ｍ２／ｇである。
（２）ＤＢＰ吸油量が２７０〜３４０ｃｍ３／１００ｇである。
（３）ＪＩＳ Ｋ６２１７−６に記載の凝集体径の測定方法により測定される、モード径（Ｄｍｏｄ）に対するＤ９０径（Ｄ９０）の比Ｄ９０／Ｄｍｏｄが１．９０〜２．２０である。
[Carbon black]
Carbon black satisfies the following conditions (1) to (3). Carbon black satisfying the following conditions (1) to (3) has good dispersibility in a solvent and the like, has a good conductivity imparting effect, and can realize excellent battery performance.
(1) A BET specific surface area is 350 to 650 m 2 / g.
(2) DBP oil absorption is 270-340 cm < 3 > / 100g.
(3) The ratio D 90 / D mod of the D90 diameter (D 90 ) to the mode diameter (D mod ) measured by the method for measuring an aggregate diameter described in JIS K6217-6 is 1.90 to 2.20. is there.
カーボンブラックのＢＥＴ比表面積は、３５０〜６５０ｍ２／ｇであり、３５０〜５５０ｍ２／ｇが好ましく、３５０〜５００ｍ２／ｇがより好ましい。カーボンブラックのＢＥＴ比表面積が下限値以上であれば、添加時に優れた電池性能が得られる。カーボンブラックのＢＥＴ比表面積が上限値以下であれば、添加時のカーボンブラックの分散性が良好になり、電極材において内部短絡等の不具合が生じ難くなる。
なお、カーボンブラックのＢＥＴ比表面積は、ＡＳＴＭ Ｄ ３０３７に準拠した方法で測定される。
BET specific surface area of the carbon black is 350~650m 2 / g, preferably from 350~550m 2 / g, 350~500m 2 / g is more preferable. If the BET specific surface area of carbon black is not less than the lower limit, excellent battery performance can be obtained at the time of addition. If the BET specific surface area of the carbon black is not more than the upper limit value, the dispersibility of the carbon black at the time of addition becomes good, and problems such as internal short circuit are less likely to occur in the electrode material.
The BET specific surface area of carbon black is measured by a method based on ASTM D 3037.
カーボンブラックは、一次粒子が葡萄房状に連なった連鎖体からなる二次粒子で構成された粉末である。この葡萄房状連鎖体の空隙部分等にＤＢＰ（ｎ−ジブチルフタレート）が吸収されるため、ＤＢＰ吸油量はカーボンブラックが有する重要な指標値である。
カーボンブラックのＤＢＰ吸油量は、２７０〜３４０ｃｍ３／１００ｇであり、２７０〜３２０ｃｍ３／１００ｇが好ましく、２８５〜３１５ｃｍ３／１００ｇがより好ましい。カーボンブラックのＤＢＰ吸油量が下限値以上であれば、添加時に良好な導電性が得られやすい。カーボンブラックのＤＢＰ吸油量が上限値以下であれば、良好な分散性が得られやすい。
なお、カーボンブラックのＤＢＰ吸油量は、ＡＳＴＭ Ｄ ２４１４に準拠した条件で、サンプル量９ｇで測定される値である。
Carbon black is a powder composed of secondary particles composed of a chain of primary particles connected in a kitchen shape. Since DBP (n-dibutyl phthalate) is absorbed into the voids of the kitchen chain, the DBP oil absorption is an important index value of carbon black.
DBP oil absorption of carbon black is 270~340cm 3 / 100g, preferably 270~320cm 3 / 100g, 285~315cm 3 / 100g and more preferably. If the DBP oil absorption of carbon black is equal to or greater than the lower limit, good conductivity can be easily obtained upon addition. If the DBP oil absorption amount of carbon black is not more than the upper limit value, good dispersibility is easily obtained.
Note that the DBP oil absorption of carbon black is a value measured with a sample amount of 9 g under conditions based on ASTM D 2414.
カーボンブラックは、ＪＩＳ Ｋ６２１７−６に記載の凝集体径の測定方法により測定される、モード径（Ｄｍｏｄ）に対するＤ９０径（Ｄ９０）の比Ｄ９０／Ｄｍｏｄが１．９０〜２．２０である。
なお、Ｄ９０径（Ｄ９０）とは、体積基準で求めた粒度分布の全体積を１００％とした累積体積分布曲線において９０％となる点の粒子径、すなわち体積基準累積９０％径を意味する。また、モード径（Ｄｍｏｄ）とは、粒度分布において最も出現比率が大きい粒子径、すなわち分布の極大値における粒子径を意味する。
比Ｄ９０／Ｄｍｏｄは、粒度分布の広がりを表す指標となる。比Ｄ９０／Ｄｍｏｄが大きくなる、すなわち粒度分布がブロードとなると樹脂等への添加時に良好な分散性能が得られ易いが、導電性付与効果が低下する。そのため、導電性能と分散性能を両立するためには、比Ｄ９０／Ｄｍｏｄのコントロールが重要となる。
Carbon black has a ratio D 90 / D mod of 1.90 to 2.20 of a D90 diameter (D 90 ) to a mode diameter (D mod ) measured by an aggregate diameter measuring method described in JIS K6217-6. It is.
The D90 diameter (D 90 ) means a particle diameter at a point of 90% in a cumulative volume distribution curve with the total volume distribution determined on a volume basis being 100%, that is, a volume-based cumulative 90% diameter. . The mode diameter (D mod ) means the particle diameter having the largest appearance ratio in the particle size distribution, that is, the particle diameter at the maximum value of the distribution.
The ratio D 90 / D mod is an index representing the spread of the particle size distribution. When the ratio D 90 / D mod is large, that is, when the particle size distribution is broad, good dispersion performance is easily obtained upon addition to a resin or the like, but the conductivity imparting effect is reduced. Therefore, control of the ratio D 90 / D mod is important in order to achieve both conductive performance and dispersion performance.
前記比Ｄ９０／Ｄｍｏｄは、１．９０〜２．２０であり、２．００〜２．２０が好ましく、２．１０〜２．２０がより好ましい。前記比Ｄ９０／Ｄｍｏｄが前記範囲内であれば、安定した導電性能が発現する。 The ratio D 90 / D mod is 1.90 to 2.20, preferably 2.00 to 2.20, and more preferably 2.10 to 2.20. When the ratio D 90 / D mod is within the above range, stable conductive performance is exhibited.
カーボンブラックのＤｍｏｄは、０．１１０〜０．１４０μｍが好ましく、０．１１５〜０．１３５μｍがより好ましい。Ｄｍｏｄが前記範囲内であれば、良好な分散性と導電性が両立されやすくなる。
カーボンブラックのＤ９０は、０．２３０〜０．３００μｍが好ましく、０．２５０〜０．２９０μｍがより好ましい。Ｄ９０が前記範囲内であれば、良好な分散性と導電性が両立されやすくなる。
The D mod of carbon black is preferably 0.110 to 0.140 μm, and more preferably 0.115 to 0.135 μm. If D mod is within the above range, both good dispersibility and conductivity are easily achieved.
Carbon black D 90 is preferably 0.230 to 0.300 μm, more preferably 0.250 to 0.290 μm. If D90 is within the above range, both good dispersibility and conductivity are easily achieved.
カーボンブラックとしては、良好な分散性と導電性が両立されやすい点から、前記ＢＥＴ比表面積が３５０〜５５０ｍ２／ｇ、ＤＢＰ吸油量が２７０〜３２０ｃｍ３／１００ｇ、前記比Ｄ９０／Ｄｍｏｄが１．９０〜２．２０であるカーボンブラックが特に好ましい。 The carbon black, from the viewpoint of easy good dispersibility and conductivity are compatible, the BET specific surface area of 350~550m 2 / g, DBP oil absorption amount 270~320cm 3 / 100g, the ratio D 90 / D mod is Carbon black that is 1.90 to 2.20 is particularly preferred.
カーボンブラックの平均一次粒子径は、３０〜５５ｎｍが好ましく、３５〜５０ｎｍがより好ましい。カーボンブラックの平均一次粒子径が下限値以上であれば、溶剤等への分散性がより良好になる。カーボンブラックの平均一次粒子径が上限値以下であれば、良好な導電性の電極合材が得られやすい。
なお、カーボンブラックの平均一次粒子径は、実施例に記載の方法により測定される値である。
30-55 nm is preferable and, as for the average primary particle diameter of carbon black, 35-50 nm is more preferable. If the average primary particle diameter of carbon black is not less than the lower limit value, the dispersibility in a solvent or the like will be better. If the average primary particle diameter of carbon black is not more than the upper limit value, a good conductive electrode mixture can be easily obtained.
In addition, the average primary particle diameter of carbon black is a value measured by the method described in Examples.
カーボンブラックの揮発分は、０．８質量％以下が好ましく、０．５質量％以下がより好ましい。カーボンブラックの揮発分が上限値以下であれば、添加時に導電性能が良好な電極合材が得られやすい。
なお、カーボンブラックの揮発分は、実施例に記載の方法で測定される。
The volatile content of carbon black is preferably 0.8% by mass or less, and more preferably 0.5% by mass or less. If the volatile content of carbon black is less than or equal to the upper limit value, an electrode mixture having good electrical conductivity when added can be easily obtained.
In addition, the volatile matter of carbon black is measured by the method as described in an Example.
カーボンブラックの灰分は、０．０５質量％以下が好ましく、０．０３質量％以下がより好ましい。カーボンブラックの灰分が上限値以下であれば、安定した導電性能を発現する電極材が得られやすい。
なお、カーボンブラックの灰分は、ＡＳＴＭ Ｄ １５０６に準拠した方法で測定される。
The ash content of carbon black is preferably 0.05% by mass or less, and more preferably 0.03% by mass or less. When the ash content of the carbon black is not more than the upper limit value, an electrode material that exhibits stable conductive performance is easily obtained.
The ash content of carbon black is measured by a method based on ASTM D 1506.
カーボンブラックの２４Ｍ４ＤＢＰ吸油量は、１３０〜２００ｃｍ３／１００ｇが好ましく、１４０〜１８０ｃｍ３／１００ｇがより好ましい。２４Ｍ４ＤＢＰ吸油量が下限値以上であれば、安定した導電性能を有する電極材が得られやすい。２４Ｍ４ＤＢＰ吸油量が上限値以下であれば、良好な分散性を有する電極材が得られやすい。
２４Ｍ４ＤＢＰ吸油量は、ＪＩＳ Ｋ ６２１７−４に記載の条件でサンプル量２０ｇを用いて測定される。
24M4DBP oil absorption of carbon black is preferably 130~200cm 3 / 100g, 140~180cm 3 / 100g and more preferably. When the 24M4DBP oil absorption is equal to or greater than the lower limit, an electrode material having stable conductive performance is easily obtained. If the 24M4DBP oil absorption is not more than the upper limit value, an electrode material having good dispersibility can be easily obtained.
The 24M4DBP oil absorption is measured using a sample amount of 20 g under the conditions described in JIS K 6217-4.
カーボンブラックは、ヨウ素吸着量が４２０〜６６０ｍｇ／ｇで、かつ１質量％水溶液のｐＨが９〜１１であることが好ましい。これにより、導電性能の安定した電極材が得られやすい。
ヨウ素吸着量は、ＪＩＳ Ｋ ６２１７−１に記載の方法で測定される。
Carbon black preferably has an iodine adsorption amount of 420 to 660 mg / g and a 1% by mass aqueous solution having a pH of 9 to 11. Thereby, it is easy to obtain an electrode material with stable conductive performance.
The iodine adsorption amount is measured by the method described in JIS K 6217-1.
カーボンブラックにおけるＢＥＴ比表面積に対するＣＴＡＢ（セチルトリメチルアンモニウムブロマイド）吸着比表面積との比（ＣＴＡＢ／ＢＥＴ）は、０．３〜０．８が好ましく、０．６〜０．８がより好ましい。前記比（ＣＴＡＢ／ＢＥＴ）が前記範囲内であれば、添加時に安定した分散性能が得られやすい。
ＣＴＡＢ吸着比表面積は、ＪＩＳ Ｋ ６２１７−３に記載の条件で測定される。
The ratio of CTAB (cetyltrimethylammonium bromide) adsorption specific surface area to CET specific surface area in carbon black (CTAB / BET) is preferably 0.3 to 0.8, more preferably 0.6 to 0.8. When the ratio (CTAB / BET) is within the above range, stable dispersion performance is easily obtained upon addition.
The CTAB adsorption specific surface area is measured under the conditions described in JIS K 6217-3.
本発明の電極合材（１００質量％）中のカーボンブラックの割合は、０．０５〜１５質量％が好ましく、０．５〜１２質量％がより好ましく、１〜１０質量％が更に好ましく、１．５〜８質量％が特に好ましい。前記カーボンブラックの割合が下限値以上であれば、安定した電池性能が得られやすい。前記カーボンブラックの割合が上限値以下であれば、安定した電池性能が得られやすい。また、カーボンブラックの割合を少なくすることで、電極合材内の複合金属酸化物の割合を増加させることが可能となり、エネルギー密度の向上と安定した電池性能を両立しやすくなる。 The ratio of carbon black in the electrode mixture (100% by mass) of the present invention is preferably 0.05 to 15% by mass, more preferably 0.5 to 12% by mass, still more preferably 1 to 10% by mass. 5 to 8% by mass is particularly preferable. If the ratio of the carbon black is equal to or higher than the lower limit value, stable battery performance is easily obtained. If the ratio of the carbon black is less than or equal to the upper limit value, stable battery performance is easily obtained. Further, by reducing the proportion of carbon black, it is possible to increase the proportion of the composite metal oxide in the electrode mixture, and it is easy to achieve both improved energy density and stable battery performance.
（カーボンブラックの製造方法）
カーボンブラックの製造方法としては、オイルファーネス法が挙げられる。
オイルファーネス法の具体例としては、例えば、原料油を、炉内において分子状酸素及び水蒸気の存在下に部分酸化反応させて、合成ガスを生成させると同時にカーボンブラックを製造する方法等が挙げられる。
カーボン製造炉としては、例えばＬＧ炉、ＳＧ炉が挙げられ、特にＳＧ炉が好ましい。
(Method for producing carbon black)
An oil furnace method is mentioned as a manufacturing method of carbon black.
Specific examples of the oil furnace method include, for example, a method in which raw oil is partially oxidized in the presence of molecular oxygen and water vapor in a furnace to generate synthesis gas and simultaneously produce carbon black. .
Examples of the carbon production furnace include an LG furnace and an SG furnace, and an SG furnace is particularly preferable.
前記条件（１）〜（３）を満たすカーボンブラックを得る条件としては、原料油１トン当たりの炉内に供給される水蒸気の比（スチーム比）、原料油１トン当たりに炉内に供給される分子状酸素の比（酸素比）、単位時間当たり炉内に供給される原料油の供給量、および原料油をエマルジョン化しないことの４項目に相当する製造条件全てのコントロールが重要である。特に条件（３）を満たすためには、原料油の供給量、原料油のエマルジョン化抑制のコントロールが特に重要となる。 The conditions for obtaining carbon black satisfying the above conditions (1) to (3) are the ratio of steam supplied to the furnace per ton of feedstock (steam ratio), and the feed to the furnace per ton of feedstock. It is important to control all the production conditions corresponding to the four items of the ratio of molecular oxygen (oxygen ratio), the amount of feedstock supplied into the furnace per unit time, and the fact that the feedstock is not emulsified. In particular, in order to satisfy the condition (3), it is particularly important to control the supply amount of the raw material oil and the suppression of the emulsification of the raw material oil.
スチーム比は、原料油１トン当たり２００〜４５０ｋｇ／ｔが好ましく、２５０〜３００ｋｇ／ｔがより好ましい。スチーム比が前記範囲内であれば、条件（１）〜（３）を満たすカーボンブラックが得られやすい。 The steam ratio is preferably 200 to 450 kg / t, more preferably 250 to 300 kg / t per ton of feedstock. If the steam ratio is within the above range, carbon black satisfying the conditions (1) to (3) can be easily obtained.
酸素比は、原料油１トン当たり５００〜６５０Ｎｍ３が好ましく、５５０〜６００Ｎｍ３がより好ましい。酸素比が前記範囲内であれば、条件（１）及び（２）を満たすカーボンブラックが得られやすい。 The oxygen ratio is preferably 500 to 650 Nm 3 per ton of feedstock oil, and more preferably 550 to 600 Nm 3 . If the oxygen ratio is within the above range, carbon black satisfying the conditions (1) and (2) can be easily obtained.
単位時間当たり炉内に供給される原料油の供給量は、１０００〜１８００ｋｇ／時間が好ましく、１２００〜１６００ｋｇ／時間がより好ましい。単位時間当たり炉内に供給される原料油の供給量が前記範囲内であれば、条件（１）〜（３）を満たすカーボンブラックが得られやすい。
原料油はエマルジョン化しないでフィードさせることが好ましい。これにより、条件（１）〜（３）を満たすカーボンブラックが得られやすい。
1000-1800 kg / hour is preferable and the supply amount of the raw material oil supplied into the furnace per unit time is more preferably 1200-1600 kg / hour. If the supply amount of the raw material oil supplied into the furnace per unit time is within the above range, carbon black satisfying the conditions (1) to (3) can be easily obtained.
The feed oil is preferably fed without being emulsified. Thereby, it is easy to obtain carbon black satisfying the conditions (1) to (3).
炉内温度は、１２５０〜１３５０℃が好ましく、１３００〜１３５０℃がより好ましい。
炉内圧力は、１５〜４５ｋｇ／ｃｍ２が好ましく、２５〜３５ｋｇ／ｃｍ２がより好ましい。
The furnace temperature is preferably 1250 to 1350 ° C, and more preferably 1300 to 1350 ° C.
Furnace pressure is preferably 15~45kg / cm 2, 25~35kg / cm 2 is more preferable.
また、得られたカーボンブラックは、窒素ガス雰囲気下で乾燥することが好ましい。乾燥温度は、３００〜９００℃が好ましく、３５０〜７００℃が更に好ましく、４００〜６００℃が特に好ましい。乾燥温度が３００℃以上であれば、揮発分が少なくなり添加時に高い導電性が得られやすい。乾燥温度が９００℃以下であれば、溶剤に対する良好な分散性能が得られやすい。 The obtained carbon black is preferably dried in a nitrogen gas atmosphere. The drying temperature is preferably 300 to 900 ° C, more preferably 350 to 700 ° C, and particularly preferably 400 to 600 ° C. When the drying temperature is 300 ° C. or higher, the volatile matter is reduced and high conductivity is easily obtained at the time of addition. When the drying temperature is 900 ° C. or lower, good dispersion performance with respect to the solvent is easily obtained.
原料油としては、カーボンブラックの製造に通常用いられるものを使用でき、例えば、クレオソート油等の石炭系炭化水素、エチレンボトム油（ＥＨＥ油）等の石油系炭化水素等が挙げられる。これらの中でもＥＨＥ油が好ましい。 As the raw material oil, those usually used for the production of carbon black can be used, and examples thereof include coal-based hydrocarbons such as creosote oil and petroleum-based hydrocarbons such as ethylene bottom oil (EHE oil). Among these, EHE oil is preferable.
原料油のＢＭＣＩ値は、１００〜２００が好ましく、１２０〜１８０が更に好ましく、１３０〜１６０が特に好ましい。ＢＭＣＩ値が１００以上であれば、歩留まりが低下し難く経済面から好ましい。ＢＭＣＩ値が２００以下であれば、原料の安定供給が容易である。
なお、原料油のＢＭＣＩ値は、下式で求められる。
ＢＭＣＩ値＝４８６４０／Ｋ＋４７３．７Ｓ−４５６．８
ただし、前記式中、Ｋは原料油の平均沸点であり、Ｓは原料油の比重である。
The BMCI value of the raw material oil is preferably 100 to 200, more preferably 120 to 180, and particularly preferably 130 to 160. If the BMCI value is 100 or more, the yield is difficult to decrease, which is preferable from an economic viewpoint. If the BMCI value is 200 or less, stable supply of raw materials is easy.
In addition, the BMCI value of the raw material oil is obtained by the following formula.
BMCI value = 48640 / K + 473.7S-456.8
However, in said formula, K is an average boiling point of raw material oil, and S is specific gravity of raw material oil.
原料油のＣ／Ｈ比は、５〜２０が好ましく、１０〜１８が更に好ましい。Ｃ／Ｈ比が５以上であれば、歩留まりが低下し難く経済面から好ましい。Ｃ／Ｈ比が２０以下であれば、原料の安定供給が容易である。 5-20 are preferable and, as for C / H ratio of raw material oil, 10-18 are still more preferable. If the C / H ratio is 5 or more, the yield is unlikely to decrease, which is preferable from the economic aspect. If the C / H ratio is 20 or less, stable supply of raw materials is easy.
原料油の不純物として、ナトリウム分は１０質量ｐｐｍ以下が好ましく、５質量ｐｐｍ以下が更に好ましく、３質量ｐｐｍ以下が特に好ましい。ナトリウム分が１０質量ｐｐｍ以下であれば、鉄等の金属分が生成カーボン中に多く残存することを抑制しやすい。
原料油の鉄含有量は、１０質量ｐｐｍ以下が好ましく、８質量ｐｐｍ以下がさらに好ましく、４質量ｐｐｍ以下が特に好ましい。鉄含有量が１０質量ｐｐｍ以下であれば、カーボン中に金属が残存して電池特性に悪影響を及ぼすことを抑制しやすい。
原料油のニッケル、銅及びマンガンの含有量は、それぞれ８質量ｐｐｍ以下が好ましく、４質量ｐｐｍ以下が更に好ましく、２質量ｐｐｍ以下が特に好ましい。ニッケル、銅及びマンガンの含有量が８質量ｐｐｍ以下であれば、カーボン中に金属が残存して電池特性に悪影響を及ぼすことを抑制しやすい。
原料油の硫黄分は、１質量％以下が好ましく、０．５質量％以下が更に好ましく、０．０１質量％以下が特に好ましい。硫黄分が１質量％以下であれば、電池特性に悪影響を及ぼすことを抑制しやすい。
As impurities of the feedstock oil, the sodium content is preferably 10 mass ppm or less, more preferably 5 mass ppm or less, and particularly preferably 3 mass ppm or less. If sodium content is 10 mass ppm or less, it is easy to suppress that many metal contents, such as iron, remain | survive in produced | generated carbon.
The iron content of the raw oil is preferably 10 mass ppm or less, more preferably 8 mass ppm or less, and particularly preferably 4 mass ppm or less. If the iron content is 10 mass ppm or less, it is easy to suppress the metal remaining in the carbon and adversely affecting the battery characteristics.
The content of nickel, copper and manganese in the raw oil is preferably 8 mass ppm or less, more preferably 4 mass ppm or less, and particularly preferably 2 mass ppm or less. If content of nickel, copper, and manganese is 8 mass ppm or less, it will be easy to suppress that a metal remains in carbon and exerts a bad influence on a battery characteristic.
The sulfur content of the raw material oil is preferably 1% by mass or less, more preferably 0.5% by mass or less, and particularly preferably 0.01% by mass or less. If the sulfur content is 1% by mass or less, it is easy to suppress adverse effects on battery characteristics.
［複合金属酸化物］
複合金属酸化物としては、特に限定されず、電極活物質として通常用いられる複合金属酸化物を用いることができる。
複合金属酸化物としては、例えば、ＬｉｘＭＯ２（但し、Ｍは１種以上の遷移金属を表し、０．０５≦ｘ≦１．１０である。）で表されるリチウム遷移金属複合酸化物が挙げられる。Ｍとしては、Ｍｎ、Ｃｏ又はＮｉの少なくとも１種が好ましい。
リチウム遷移金属複合酸化物の具体例としては、例えば、ＬｉＣｏＯ２、ＬｉＮｉＯ２、ＬｉＭｎＯ２、ＬｉＭｎ２Ｏ４、Ｌｉ２ＭｎＯ３、ＬｉＭｎ１／２Ｎｉ１／２Ｏ２、ＬｉＮｉ１／３Ｃｏ１／３Ｍｎ１／３Ｏ２等が挙げられる。
[Composite metal oxide]
It does not specifically limit as a composite metal oxide, The composite metal oxide normally used as an electrode active material can be used.
As the composite metal oxide, for example, Li x MO 2 (wherein M represents one or more transition metals, and 0.05 ≦ x ≦ 1.10.) Is mentioned. M is preferably at least one of Mn, Co or Ni.
Specific examples of the lithium transition metal composite oxide include, for example, LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMn 2 O 4 , Li 2 MnO 3 , LiMn 1/2 Ni 1/2 O 2 , LiNi 1/3 Co 1. / 3 Mn 1/3 O 2 and the like.
また、複合金属酸化物としては、例えば、ＬｉＦｅＰＯ４、ＬｉＦｅＰ２Ｏ７、ＬｉＭｎＰＯ４、ＬｉＣｏＰＯ４、ＬｉＮｉＰＯ４、Ｌｉ２ＦｅＳｉＯ４、Ｌｉ２ＭｎＳｉＯ４、Ｌｉ２ＮｉＳｉＯ４、Ｌｉ２ＣｏＳｉＯ４等のオリビン型金属リチウム塩を用いてもよい。
本発明の電極合材に含有される複合金属酸化物は、１種でもよく、２種以上でもよい。
Examples of the composite metal oxide include olivine such as LiFePO 4 , LiFeP 2 O 7 , LiMnPO 4 , LiCoPO 4 , LiNiPO 4 , Li 2 FeSiO 4 , Li 2 MnSiO 4 , Li 2 NiSiO 4 , Li 2 CoSiO 4. Type metal lithium salts may be used.
1 type may be sufficient as the composite metal oxide contained in the electrode compound material of this invention, and 2 or more types may be sufficient as it.
本発明の電極合材（１００質量％）中の複合金属酸化物の割合は、７０〜９９．９質量％が好ましく、７６〜９９質量％がより好ましい。前記複合金属酸化物の割合が下限値以上であれば、安定した電池性能が得られやすい。前記複合金属酸化物の割合が上限値以下であれば、安定した電池性能が得られやすい。 70-99.9 mass% is preferable and, as for the ratio of the composite metal oxide in the electrode compound material (100 mass%) of this invention, 76-99 mass% is more preferable. If the ratio of the composite metal oxide is not less than the lower limit value, stable battery performance is easily obtained. If the ratio of the composite metal oxide is not more than the upper limit value, stable battery performance is easily obtained.
［バインダー樹脂］
バインダー樹脂としては、特に限定されず、電極材に通常用いられるバインダー樹脂を用いることができる。
バインダー樹脂の具体例としては、例えば、ポリフッ化ビニリデン、ポリテトラフルオロエチレン等のフッ素系樹脂、スチレン・ブタジエンゴム、イソプレンゴム、ブタジエンゴム等の不飽和結合を有する重合体等が挙げられる。
本発明の電極合材に含有されるバインダー樹脂は、１種でもよく、２種以上でもよい。
[Binder resin]
It does not specifically limit as binder resin, The binder resin normally used for an electrode material can be used.
Specific examples of the binder resin include, for example, fluorine resins such as polyvinylidene fluoride and polytetrafluoroethylene, and polymers having an unsaturated bond such as styrene / butadiene rubber, isoprene rubber and butadiene rubber.
The binder resin contained in the electrode mixture of the present invention may be one type or two or more types.
本発明の電極合材（１００質量％）中のバインダー樹脂の割合は、０．０５〜１５質量％が好ましく、０．５〜１２質量％がより好ましい。前記バインダー樹脂の割合が下限値以上であれば、安定した電池性能が得られやすい。前記バインダー樹脂の割合が上限値以下であれば、安定した電池性能が得られやすい。 0.05-15 mass% is preferable and, as for the ratio of the binder resin in the electrode compound material (100 mass%) of this invention, 0.5-12 mass% is more preferable. If the ratio of the binder resin is not less than the lower limit value, stable battery performance is easily obtained. If the ratio of the binder resin is equal to or less than the upper limit value, stable battery performance is easily obtained.
［他の成分］
本発明の電極合材は、必要に応じて、カーボンブラック、複合金属酸化物及びバインダー樹脂以外の他の成分をさらに含有してもよい。
他の成分としては、例えば、界面活性剤等が挙げられる。
[Other ingredients]
The electrode mixture of the present invention may further contain other components other than carbon black, composite metal oxide, and binder resin, if necessary.
Examples of other components include a surfactant.
本発明の電極合材が他の成分を含有する場合、本発明の電極合材（１００質量％）中の他の成分の割合は、０．０５〜１５質量％が好ましく、０．５〜１２質量％がより好ましい。 When the electrode mixture of the present invention contains other components, the proportion of the other components in the electrode mixture (100 mass%) of the present invention is preferably 0.05 to 15 mass%, and 0.5 to 12 The mass% is more preferable.
本発明の電極合材を用いて電極材を製造する方法としては、特に限定されず、例えば、溶媒に溶解又は分散させたスラリーを集電体上に塗工した後に溶媒を揮発させる方法、電極合材の各成分を混練した混練物を集電体上に塗工する方法等が挙げられる。 The method for producing the electrode material using the electrode mixture of the present invention is not particularly limited. For example, the method of volatilizing the solvent after applying the slurry dissolved or dispersed in the solvent on the current collector, the electrode Examples thereof include a method of coating a kneaded product obtained by kneading each component of the composite material on a current collector.
集電体としては、電極材の集電体として通常用いられているものを用いることができ、例えば、アルミニウム、アルミニウムを主成分とする合金等からなる金属箔等が挙げられる。 As the current collector, those usually used as a current collector for electrode materials can be used, and examples thereof include aluminum, a metal foil made of an alloy containing aluminum as a main component, and the like.
溶媒としては、電極材の製造に通常用いられる溶媒を用いることができ、例えば、アルキルアルコール類（メチルアルコール、エチルアルコール、プロピルアルコール等。）、アルキルケトン類（アセトン、メチルエチルケトン等。）、エーテル類（テトラヒドロフラン、ジオキサン、ジグライム等。）、アミド類（ジエチルホルムアミド、ジメチルアセトアミド、Ｎ−メチル−２−ピロリドン、ジメチルイミダゾリジノン等。）等が挙げられる。 As the solvent, a solvent usually used in the production of electrode materials can be used. For example, alkyl alcohols (methyl alcohol, ethyl alcohol, propyl alcohol, etc.), alkyl ketones (acetone, methyl ethyl ketone, etc.), ethers. (Tetrahydrofuran, dioxane, diglyme, etc.), amides (diethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone, dimethylimidazolidinone, etc.) and the like.
以上説明した本発明の電極合材を用いれば、条件（１）〜（３）を満たすカーボンブラックを用いているため、内部短絡等の不具合が生じ難く、かつ優れた電池性能が得られる電極材を製造できる。さらに、カーボンブラックを少ない量で使用しても電池性能が得られ、電極合材中の複合金属酸化物の割合を増加させることが可能となり、電池のエネルギー密度の向上が容易な電極材を製造できる。
従来から、分散性が良好なカーボンブラックとしては、アセチレンブラック等のＤＢＰ吸油量２７０ｃｍ３／１００ｇ未満かつＢＥＴ比表面積３５０ｍ２／ｇ未満のカーボンブラック（以下、「カーボンブラック（ａ）」という。）が市販されているが、カーボンブラック（ａ）は電池等への添加時に導電性付与効果が低い。また、導電性付与効果が高いカーボンブラックとしては、ＤＢＰ吸油量３４０ｃｍ３／１００ｇ超かつＢＥＴ比表面積６５０ｍ２／ｇ超のカーボンブラック（以下、「カーボンブラック（ｂ）」という。）が市販されているが、溶剤への添加時には分散性が低い。本発明で使用するカーボンブラックは、理由は明らかではないが、カーボンブラック（ａ）の分散性及び導電性とカーボンブラック（ｂ）の分散性及び導電性から想定される中間の性能と比較しても、より良好な分散性及び導電性を有している。これにより、前記効果が得られると考えられる。
If the electrode mixture of the present invention described above is used, the carbon black that satisfies the conditions (1) to (3) is used, and therefore, an electrode material that is less prone to problems such as internal short circuit and that has excellent battery performance. Can be manufactured. Furthermore, even if carbon black is used in a small amount, battery performance can be obtained, the ratio of the composite metal oxide in the electrode mixture can be increased, and an electrode material that can easily improve the energy density of the battery is produced. it can.
Conventionally, as a good carbon black dispersion, acetylene black DBP oil absorption of 270 cm 3/100 g less and a BET specific surface area of 350 meters 2 / g less than the carbon black (hereinafter, referred to as "carbon black (a)".) Is commercially available, but carbon black (a) has a low conductivity imparting effect when added to a battery or the like. As the conductivity-imparting effect is high carbon black, DBP oil absorption of 340 cm 3/100 g super and a BET specific surface area of 650 meters 2 / g than the carbon black (hereinafter, referred to as "carbon black (b)".) It is commercially available However, when added to a solvent, the dispersibility is low. The reason for the carbon black used in the present invention is not clear, but compared with the intermediate performance assumed from the dispersibility and conductivity of carbon black (a) and the dispersibility and conductivity of carbon black (b). Also have better dispersibility and conductivity. Thereby, it is thought that the said effect is acquired.
以下、実施例によって本発明を詳細に説明するが、本発明は以下の記載によっては限定されない。
［測定方法］
（カーボンブラックのＤＰＢ吸油量）
カーボンブラックのＤＰＢ吸油量は、ＡＳＴＭ Ｄ ２４１４に準拠した条件で、サンプル量９ｇで測定した。
EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by the following description.
[Measuring method]
(DPB oil absorption of carbon black)
The DPB oil absorption amount of carbon black was measured with a sample amount of 9 g under the conditions based on ASTM D 2414.
（カーボンブラックのＢＥＴ比表面積）
カーボンブラックのＢＥＴ比表面積は、ＡＳＴＭ Ｄ ３０３７に準拠した条件で測定した。
(BET specific surface area of carbon black)
The BET specific surface area of carbon black was measured under conditions based on ASTM D 3037.
（カーボンブラックの比Ｄ９０／Ｄｍｏｄ）
カーボンブラックの比Ｄ９０／Ｄｍｏｄは、ＪＩＳ Ｋ６２１７−６に記載の凝集体径の測定方法により測定した。
具体的には、界面活性剤（ＳＩＧＭＡ ＣＨＥＭＩＣＡＬ社製「ＮＯＮＩＤＥＴ Ｐ−４０」）を３滴加えた２０容量％エタノール水溶液に、精秤したカーボンブラックを加えて、カーボンブラック濃度が０．０１質量％の試料液を調製した。該試料液を超音波洗浄機（ＵＬＴＲＡＳＯＮＩＣ ＳＴＩＲＲＩＮＧ ＢＡＴＨ：ＬＡＫＯＭＡＮＵＦＡＣＴＵＲＩＮＧ ＣＯ．製）を用いて２０分間分散処理することにより、カーボンブラックスラリーとした。遠心沈降式の粒度分布測定装置（ＢＲＯＯＫ ＨＡＶＥＮ ＩＮＳＴＲＵＭＥＮＴＳ社製「ＢＩ−ＤＣＰ ＰＡＲＴＩＣＬＳＩＺＥＲ」）にスピン液（純水）１０ｍＬを注入し、更にバッファー液（２０容量％エタノール水溶液）１ｍＬを注入した後、前記カーボンブラックスラリー１ｍＬを注入し、回転数１００００ｒｐｍで遠心沈降させ、真比重１．７８でストークス相当径を計算し、図１に示すような、ストークス相当径に対して相対的な発生頻度のヒストグラムを作った。
ヒストグラムのピークＡから直線ＢをＹ軸に平行に引き、ヒストグラムのＸ軸との交点をＣとした。このときのＣでのストークス直径が、モード径（Ｄｍｏｄ）となる。また、このヒストグラムにおいて積算量が９０％となる点Ｄから直線ＥをＹ軸に平行に引き、ヒストグラムのＸ軸との交点をＦとした。このときのＦでのストークス直径が、Ｄ９０径（Ｄ９０）となる。
(Carbon black ratio D 90 / D mod )
The carbon black ratio D 90 / D mod was measured by the aggregate diameter measuring method described in JIS K6217-6.
Specifically, a well-balanced carbon black was added to a 20 vol% ethanol aqueous solution to which 3 drops of a surfactant (“NONIDET P-40” manufactured by SIGMA CHEMICAL) was added, and the carbon black concentration was 0.01% by mass. A sample solution was prepared. The sample solution was subjected to a dispersion treatment for 20 minutes using an ultrasonic cleaner (ULTRASONIC STIRRING BATH: manufactured by LAKOMANUFACTURERING CO.) To obtain a carbon black slurry. After injecting 10 mL of spin solution (pure water) into a centrifugal sedimentation type particle size distribution measuring apparatus (“BI-DCP PARTIC LSIZ” manufactured by BROOK HAVEN INSTRUMENTS), and further injecting 1 mL of buffer solution (20 vol% ethanol aqueous solution), 1 mL of carbon black slurry was injected, centrifuged at 10000 rpm, and the Stokes equivalent diameter was calculated with a true specific gravity of 1.78. A histogram of the relative frequency of occurrence with respect to the Stokes equivalent diameter as shown in FIG. Had made.
A straight line B was drawn from the peak A of the histogram in parallel to the Y axis, and the intersection with the X axis of the histogram was taken as C. The Stokes diameter at C at this time is the mode diameter (D mod ). In addition, a straight line E was drawn in parallel with the Y axis from the point D at which the integrated amount becomes 90% in this histogram, and the intersection with the X axis of the histogram was taken as F. Stokes diameter at F at this time, the D90 diameter (D 90).
（カーボンブラックの平均一次粒子径）
カーボンブラックの平均一次粒子径は、透過型電子顕微鏡を用いて求めた。具体的にはカーボンブラック試料を１５０ｋＨｚ、０．４ｋＷの超音波分散機により、１０分間クロロホルムに分散させて分散試料を作成し、これをカーボン補強した支持膜に振り掛けて固定した。これを透過型電子顕微鏡で撮影し、５００００〜２０００００倍に拡大した画像からＥｎｄｔｅｒの装置を用いてランダムに１０００個以上のカーボンブラックの粒子径を測定し、その平均値を平均一次粒子径とした。
(Average primary particle size of carbon black)
The average primary particle diameter of carbon black was determined using a transmission electron microscope. Specifically, a carbon black sample was dispersed in chloroform for 10 minutes using an ultrasonic disperser of 150 kHz and 0.4 kW to prepare a dispersion sample, which was sprinkled and fixed on a carbon reinforced support film. This was photographed with a transmission electron microscope, and the particle size of 1000 or more carbon blacks was randomly measured using an Endter apparatus from an image magnified 50000-200000 times, and the average value was taken as the average primary particle size. .
（カーボンブラックの揮発分）
磁性るつぼ（直径１５ｍｍ、高さ３０ｍｍ、容量１０ｍＬ）及び落とし蓋を９５０±２０℃で３０分間空焼きした後、デシケータ中で室温（２５℃）まで冷却し、該磁性るつぼ及び落とし蓋の質量（ＭＡ）を０．１ｍｇ単位まで正確に秤量した。次いで、カーボンブラックの２ｇを、磁性るつぼ中に蓋下２ｍｍを越えない程度に押し詰めて落とし蓋をし、その質量（ＭＢ）を０．１ｍｇ単位まで正確に秤量した。その後、９５０±２０℃の電気炉で７分間加熱し、デシケータ中で室温（２５℃）まで冷却して、再度、質量（ＭＣ）を０．１ｍｇ単位まで正確に秤量して、以下の式により揮発分を算出した。
揮発分（質量％）＝（ＭＢ−ＭＣ）／（ＭＢ−ＭＡ）
(Carbon black volatiles)
The magnetic crucible (diameter 15 mm, height 30 mm, capacity 10 mL) and the drop lid were baked at 950 ± 20 ° C. for 30 minutes, then cooled to room temperature (25 ° C.) in a desiccator, and the mass of the magnetic crucible and drop lid ( M A ) was accurately weighed to the nearest 0.1 mg. Next, 2 g of carbon black was pressed into a magnetic crucible so as not to exceed 2 mm below the lid, and the lid was dropped, and the mass (M B ) was accurately weighed to the nearest 0.1 mg. Then, it is heated in an electric furnace at 950 ± 20 ° C. for 7 minutes, cooled to room temperature (25 ° C.) in a desiccator, and again weighed the mass (M C ) to the nearest 0.1 mg, and the following formula To calculate the volatile content.
Volatiles (wt%) = (M B -M C ) / (M B -M A)
（カーボンブラックの灰分）
カーボンブラックの灰分は、ＡＳＴＭ Ｄ １５０６に準拠した条件で測定した。
(Carbon black ash)
The ash content of carbon black was measured under conditions based on ASTM D 1506.
（カーボンブラックの２４Ｍ４ＤＢＰ吸油量）
ＪＩＳ Ｋ ６２１７−４に記載の条件で、サンプル量２０ｇを用いて実施した。
(24M4DBP oil absorption of carbon black)
The test was carried out using a sample amount of 20 g under the conditions described in JIS K 6217-4.
（カーボンブラックのＣＴＡＢ吸着比表面積）
ＪＩＳ Ｋ ６２１７−３に記載の条件で測定を実施した。
(CTAB adsorption specific surface area of carbon black)
The measurement was carried out under the conditions described in JIS K 6217-3.
（カーボンブラックのヨウ素吸着量）
ＪＩＳ Ｋ ６２１７−１に記載の方法で測定を実施した。
(Iodine adsorption amount of carbon black)
Measurement was carried out by the method described in JIS K 6217-1.
（カーボンブラックのｐＨ測定法）
カーボンブラック１ｇ±０．０１ｇを０．０１ｇまで正確に秤量して２０ｍＬビーカーに採取後、１ｍＬのエチルアルコールと、あらかじめ沸騰させた蒸留水１０ｍＬを加え、カーボンブラックの分散液とし、時計皿で蓋をして、２５℃の恒温室にて６０分間放冷した。分散液が２５℃になっていることを確認し、ｐＨ標準液４，７，９で校正したｐＨメーターを用いて、測定開始から１分後の指示値を読み取った。
(PH measurement method for carbon black)
Accurately weigh carbon black 1g ± 0.01g to 0.01g, collect in a 20mL beaker, add 1mL ethyl alcohol and 10mL distilled water boiled in advance to make a dispersion of carbon black, cover with a watch glass And allowed to cool in a constant temperature room at 25 ° C. for 60 minutes. After confirming that the dispersion was at 25 ° C., using the pH meter calibrated with the pH standard solutions 4, 7, and 9, the reading value one minute after the start of the measurement was read.
［原料油］
本製造例に用いた原料油の性状を以下に示す。
種類：ＥＨＥ油
初留温度：１９８℃
１０％留出温度：２２０℃
５０％留出温度：２７９℃
Ｃ／Ｈ比：１３．５
不純物：ナトリウム３質量ｐｐｍ、鉄４質量ｐｐｍ、ニッケル２質量ｐｐｍ、銅２質量ｐｐｍ、マンガン２質量ｐｐｍ、硫黄１０質量ｐｐｍ
ＢＭＣＩ値：１４５
[Raw oil]
The properties of the raw material oil used in this production example are shown below.
Type: EHE oil Initial distillation temperature: 198 ° C
10% distillation temperature: 220 ° C
50% distillation temperature: 279 ° C
C / H ratio: 13.5
Impurities: sodium 3 mass ppm, iron 4 mass ppm, nickel 2 mass ppm, copper 2 mass ppm, manganese 2 mass ppm, sulfur 10 mass ppm
BMCI value: 145
［製造例１］
ファーネス炉を用いて、炉内への原料油の供給量（オイル供給量）を１４００ｋｇ／時間、原料油１トンあたりの炉内に供給される水蒸気の比（スチーム比）を２５０ｋｇ／ｔ、酸素比を５７０Ｎｍ３／ｔ、メタン濃度を０．７０体積％、炉内温度を１３３５℃、炉内圧力を３０ｋｇ／ｃｍ２としてカーボンブラックを得た。さらに得られたカーボンブラックを４５０℃窒素雰囲気中で乾燥した。原料油１トンあたりカーボンブラックの収量は、２２３ｋｇ／ｔであった。
[Production Example 1]
Using a furnace, the feed rate of the feedstock oil (oil feed rate) to the furnace is 1400 kg / hour, the ratio of steam supplied to the furnace per ton of feedstock (steam ratio) is 250 kg / t, oxygen Carbon black was obtained with a ratio of 570 Nm 3 / t, a methane concentration of 0.70 vol%, a furnace temperature of 1335 ° C., and a furnace pressure of 30 kg / cm 2 . Further, the obtained carbon black was dried in a nitrogen atmosphere at 450 ° C. The yield of carbon black per ton of feedstock was 223 kg / t.
［製造例２〜４］
オイル供給量、スチーム比、酸素比、メタン濃度、炉内温度、炉内圧力をそれぞれ表１に示すように変更した以外は、製造例１と同様にしてカーボンブラックを得た。
製造例１〜４で得られたカーボンブラックのＤＢＰ吸油量、ＢＥＴ比表面積、Ｄｍｏｄ、Ｄ９０、比Ｄ９０／Ｄｍｏｄ、平均一次粒子径、収率及び灰分を表１に示す。
[Production Examples 2 to 4]
Carbon black was obtained in the same manner as in Production Example 1, except that the oil supply amount, steam ratio, oxygen ratio, methane concentration, furnace temperature, and furnace pressure were changed as shown in Table 1.
Table 1 shows the DBP oil absorption, BET specific surface area, D mod , D 90 , ratio D 90 / D mod , average primary particle size, yield and ash content of the carbon blacks obtained in Production Examples 1 to 4.
［製造例５］
ファーネス炉を用いて、炉内へのエマルジョン原料油の供給量２２２２ｋｇ／時間（原料油としての供給量２０００ｋｇ／時間）、原料油１トンあたりの炉内に供給される水蒸気の比（スチーム比）を５１５ｋｇ／ｔ、酸素比を６３５Ｎｍ３／ｔ、メタン濃度を０．８３体積％、炉内温度を１３０５℃、炉内圧力を３０ｋｇ／ｃｍ２としてカーボンブラックを得た。さらに得られたカーボンブラックを４５０℃、窒素雰囲気中で乾燥した。原料油１トンあたりカーボンブラックの収量は、１３０ｋｇ／ｔであった。
[Production Example 5]
Using furnace furnace, the feed rate of emulsion feed oil into the furnace is 2222 kg / hour (feed rate as feedstock is 2000 kg / hour), the ratio of steam supplied to the furnace per ton of feedstock (steam ratio) Was 515 kg / t, the oxygen ratio was 635 Nm 3 / t, the methane concentration was 0.83 vol%, the furnace temperature was 1305 ° C., and the furnace pressure was 30 kg / cm 2 to obtain carbon black. Further, the obtained carbon black was dried at 450 ° C. in a nitrogen atmosphere. The yield of carbon black per ton of feedstock was 130 kg / t.
［実施例１］
（電極材の製造）
遊星回転ボールミルＬＰ−１（株式会社伊藤製作所製）を用い、混練温度２５℃、回転数３００ｒｐｍの条件下、複合金属酸化物であるＬｉＦｅＰＯ４の１００質量部、製造例１で得られたカーボンブラックの１０質量部、バインダー樹脂であるポリフッ化ビニリデンの１０質量部、及びｎ−メチル−２−ピロリドンの１７０質量部をこの順に入れ、１０分間混練してスラリーを得た。アルミニウム箔（３０ｍｍ×１４０ｍｍ）上にポリエチレン（ＰＥ）塗工枠（厚み０．２ｍｍ）を載せ、ガラス棒を用いて前記スラリーを塗工した。その後、スラリーが塗工されたアルミニウム箔を、ホットスターラＨＳ−５ＢＨ（アズワン株式会社製）にて１１０℃、１時間の条件で加熱し、ｎ−メチル−２−ピロリドンを揮発させた。ＳＵＳローラーを用いて表面を平坦にさせてから、塗工後のアルミニウム箔を２０ｍｍ×２０ｍｍにカットした後、ＳＵＳローラーを用いて切り出した断片を平坦にし、ハンドプレスＳＳＰ−１０Ａ（株式会社島津製作所）を用いてプレス（プレス温度２５℃、プレス圧力３７０ＭＰａ、プレス時間１分間）を行った。さらに、バキュームオーブン（Ｉｓｏｔｅｍｐ Ｖａｃｕｕｍ Ｏｖｅｎ Ｍｏｄｅｌ ２８０Ａ、Ｆｉｓｃｈｅｒ Ｓｃｉｅｎｔｉｆｉｃ製）を用いて、１１０℃、５時間の条件で減圧乾燥を行い、電極材とした。電極材は複数製造し、アルゴン雰囲気のドライボックス内で測定した厚みが２５±３ｍｍのものを電池特性の評価に用いた。
[Example 1]
(Manufacture of electrode materials)
Carbon black obtained in Production Example 1 using a planetary rotating ball mill LP-1 (manufactured by Ito Seisakusho Co., Ltd.) under conditions of a kneading temperature of 25 ° C. and a rotational speed of 300 rpm, 100 parts by mass of LiFePO 4 which is a composite metal oxide. 10 parts by mass, 10 parts by mass of polyvinylidene fluoride as a binder resin, and 170 parts by mass of n-methyl-2-pyrrolidone were put in this order and kneaded for 10 minutes to obtain a slurry. A polyethylene (PE) coating frame (thickness 0.2 mm) was placed on an aluminum foil (30 mm × 140 mm), and the slurry was applied using a glass rod. Thereafter, the aluminum foil coated with the slurry was heated with a hot stirrer HS-5BH (manufactured by ASONE Corporation) at 110 ° C. for 1 hour to volatilize n-methyl-2-pyrrolidone. After flattening the surface using a SUS roller, the coated aluminum foil was cut into 20 mm × 20 mm, and then the fragments cut out using a SUS roller were flattened, and hand press SSP-10A (Shimadzu Corporation) ) Was used (press temperature 25 ° C., press pressure 370 MPa, press time 1 minute). Furthermore, using a vacuum oven (Isotemp Vacuum Oven Model 280A, manufactured by Fischer Scientific) under reduced pressure drying at 110 ° C. for 5 hours, an electrode material was obtained. A plurality of electrode materials were manufactured, and those having a thickness of 25 ± 3 mm measured in a dry box in an argon atmosphere were used for evaluation of battery characteristics.
（評価セルの製造）
評価セルの組み立ては、アルゴン雰囲気のドライボックス内で行った。樹脂ローラーにより、ニッケル板（２５ｍｍ×２５ｍｍ）にリチウム箔（２５ｍｍ×２５ｍｍ）を定着させた。次いで、前記リチウム箔上にセパレータ（２６ｍｍ×２６ｍｍ）を積層した後、電極材（２０ｍｍ×２０ｍｍ）をスラリー塗工面が前記セパレータ側となるように積層し、さらにアルミニウム板（２２ｍｍ×２２ｍｍ）を積層した。次いで、前記セパレータと材質が同じ２６ｍｍ×５５ｍｍの包装材を正方形となるように二つ折りにしたものの間に、ニッケル板、リチウム箔、セパレータ、電極材及びアルミニウム板の積層体を挟み込んだ状態で、電解液注入部を備えた筺体内に挿入した。このとき、デジタルテスターＣＤＭ−０３Ｄ（株式会社カスタム製）を用いて回路内抵抗を測定し、抵抗値が０．００１Ω未満で短絡が生じていないことを確認した。
ヒートシーラーＦＴ−１３０（富士インパルス株式会社製）を用いて、前記筺体における電解液注入部以外の部分を封止した後、電解液注入部から電解液（１Ｍ ＬｉＰＦ６を含むエチレンカーボネート（ＥＣ）／ジメチルカーボネート（ＤＭＣ）＝１／２）０．６ｍＬを注入し、９０Ｔｏｒｒで５分間置くことで電極材に電解液を浸み込ませ、電解液を電池内部に充分に拡散させた。その後、筺体の電解液注入部をヒートシーラーＦＴ−１３０により封止し、評価セルとした。
(Manufacture of evaluation cells)
The evaluation cell was assembled in a dry box in an argon atmosphere. A lithium foil (25 mm × 25 mm) was fixed to a nickel plate (25 mm × 25 mm) with a resin roller. Next, after laminating a separator (26 mm × 26 mm) on the lithium foil, an electrode material (20 mm × 20 mm) is laminated so that the slurry coating surface is on the separator side, and an aluminum plate (22 mm × 22 mm) is further laminated. did. Next, in a state where a laminate of a nickel plate, a lithium foil, a separator, an electrode material and an aluminum plate is sandwiched between two folds of a packaging material having the same material as that of the separator 26 mm × 55 mm so as to be square, It inserted in the housing provided with the electrolyte injection part. At this time, the resistance in the circuit was measured using a digital tester CDM-03D (manufactured by Custom Co., Ltd.), and it was confirmed that the resistance value was less than 0.001Ω and no short circuit occurred.
After sealing parts other than the electrolyte injection part in the said housing using heat sealer FT-130 (made by Fuji Impulse Co., Ltd.), electrolyte solution (ethylene carbonate (EC) containing 1M LiPF 6 ) from the electrolyte injection part / Dimethyl carbonate (DMC) = 1/2) 0.6 mL was injected and placed at 90 Torr for 5 minutes, so that the electrolyte was immersed in the electrode material, and the electrolyte was sufficiently diffused inside the battery. Thereafter, the electrolyte solution injection portion of the casing was sealed with a heat sealer FT-130 to obtain an evaluation cell.
［実施例２〜１１］
カーボンブラック、複合金属酸化物、バインダー樹脂を表２に示すように変更した以外は、実施例１と同様にして評価セルを製造した。
[Examples 2 to 11]
An evaluation cell was manufactured in the same manner as in Example 1 except that carbon black, composite metal oxide, and binder resin were changed as shown in Table 2.
［比較例１］
比較対象のカーボンブラックとして、製造例５で得られたＤＢＰ吸油量が３２４ｃｍ３／１００ｇ、ＢＥＴ比表面積が８００ｍ２／ｇ、比Ｄ９０／Ｄｍｏｄが１．８０（Ｄ９０＝０．２００μｍ、Ｄｍｏｄ＝０．１１１μｍ）のカーボンブラックを用いた以外は、実施例１と同様にして評価セルを得た。
[Comparative Example 1]
As carbon black for comparison, DBP oil absorption amount obtained in Production Example 5 324cm 3 / 100g, BET specific surface area of 800 m 2 / g, the ratio D 90 / D mod is 1.80 (D 90 = 0.200μm, An evaluation cell was obtained in the same manner as in Example 1 except that carbon black of D mod = 0.111 μm was used.
［比較例２］
比較対象のカーボンブラックとして、ＤＢＰ吸油量が１９３ｃｍ３／１００ｇ、ＢＥＴ比表面積が５５ｍ２／ｇ、比Ｄ９０／Ｄｍｏｄが３．４７（Ｄ９０＝０．４０６μｍ、Ｄｍｏｄ＝０．１１７μｍ）の市販カーボンブラックを用いた以外は、実施例１と同様にして評価セルを得た。
[Comparative Example 2]
As carbon black for comparison, DBP oil absorption of 193cm 3 / 100g, BET specific surface area of 55m 2 / g, the ratio D 90 / D mod is 3.47 (D 90 = 0.406μm, D mod = 0.117μm) An evaluation cell was obtained in the same manner as in Example 1 except that the commercially available carbon black was used.
［比較例３］
比較対象のカーボンブラックとして、ＤＢＰ吸油量が１６６ｃｍ３／１００ｇ、ＢＥＴ比表面積が２５６ｍ２／ｇ、比Ｄ９０／Ｄｍｏｄが１．７０（Ｄ９０＝０．２９２μｍ、Ｄｍｏｄ＝０．１７２μｍ）の市販カーボンブラックを用いた以外は、実施例１と同様にして評価セルを得た。
[Comparative Example 3]
As carbon black for comparison, DBP oil absorption of 166cm 3 / 100g, a BET specific surface area 256m 2 / g, the ratio D 90 / D mod is 1.70 (D 90 = 0.292μm, D mod = 0.172μm) An evaluation cell was obtained in the same manner as in Example 1 except that the commercially available carbon black was used.
［比較例４］
比較例１のカーボンブラックと比較例３のカーボンブラックを質量比５９／４１でブレンドして得られる、ＤＢＰ吸油量が２８０ｃｍ３／１００ｇ、ＢＥＴ比表面積が５７６ｍ２／ｇ、比Ｄ９０／Ｄｍｏｄが１．７５（Ｄ９０＝０．２３８μｍ、Ｄｍｏｄ＝０．１３６μｍ）となるカーボンブラックを用いた以外は、実施例１と同様にして評価セルを得た。
[Comparative Example 4]
Resulting carbon black of Comparative Example 3 and carbon black in Comparative Example 1 were blended in a weight ratio 59/41, DBP oil absorption of 280 cm 3/100 g, BET specific surface area of 576m 2 / g, the ratio D 90 / D mod An evaluation cell was obtained in the same manner as in Example 1 except that carbon black having a value of 1.75 (D 90 = 0.238 μm, D mod = 0.136 μm) was used.
［比較例５］
比較例１のカーボンブラックと比較例２のカーボンブラックを質量比５２／４８でブレンドして得られる、ＤＢＰ吸油量が２８０ｃｍ３／１００ｇ、ＢＥＴ比表面積が４４３ｍ２／ｇ、比Ｄ９０／Ｄｍｏｄが２．６２（Ｄ９０＝０．２９９μｍ、Ｄｍｏｄ＝０．１１４μｍ）となるカーボンブラックを用いた以外は、実施例１と同様にして評価セルを得た。
[Comparative Example 5]
Resulting carbon black of Comparative Example 2 carbon black of Comparative Example 1 were blended in a weight ratio 52/48, DBP oil absorption of 280cm 3 / 100g, BET specific surface area of 443m 2 / g, the ratio D 90 / D mod An evaluation cell was obtained in the same manner as in Example 1 except that carbon black having a value of 2.62 (D 90 = 0.299 μm, D mod = 0.114 μm) was used.
［比較例６〜８］
比較例２のカーボンブラックを用い、カーボンブラックの使用量、複合金属酸化物の種類、樹脂バインダーの使用量を表３に示すように変更した以外は、実施例１と同様にして評価セルを得た。
[Comparative Examples 6-8]
An evaluation cell was obtained in the same manner as in Example 1 except that the carbon black of Comparative Example 2 was used, and the amount of carbon black used, the type of composite metal oxide, and the amount of resin binder used were changed as shown in Table 3. It was.
［電池特性］
評価セルをドライボックスから取り出し、ＳＵＳ板で電池電極部を１５Ｎｍのトルクで固定した。ポケットテスター（株式会社カスタム製）を用いて開回路電圧を測定し、３．４Ｖの電圧を示した評価セルについて、充放電装置ＨＪ１００１ＳＤ８（北斗電工株式会社製）を用いて充放電測定を行った。充放電測定では、レート０．２Ｃの定電流で５時間充電を行った後、さらに４．１Ｖの定電圧で２．５時間充電を行い、３０分間静止させた後、レート３０Ｃで２．０Ｖまで放電を行った。評価セルの理論容量に対するレート３０Ｃでの放電における放電容量の割合を容量維持率とした。
なお、レート１Ｃは、評価セルの理論容量を１時間で放電できる電流値を示す。
[Battery characteristics]
The evaluation cell was taken out from the dry box, and the battery electrode portion was fixed with a torque of 15 Nm with a SUS plate. The open circuit voltage was measured using a pocket tester (manufactured by Custom Co., Ltd.), and the charge / discharge measurement was performed using the charge / discharge device HJ1001SD8 (manufactured by Hokuto Denko Co., Ltd.) for the evaluation cell showing a voltage of 3.4 V . In charge / discharge measurement, after charging for 5 hours at a constant current of 0.2C, charge for 2.5 hours at a constant voltage of 4.1V, and rest for 30 minutes, then 2.0V at a rate of 30C. Discharge was performed. The ratio of the discharge capacity in the discharge at a rate of 30 C with respect to the theoretical capacity of the evaluation cell was defined as the capacity maintenance rate.
The rate 1C indicates a current value that can discharge the theoretical capacity of the evaluation cell in one hour.
［電池抵抗］
電池特性の評価と同様にして評価セルを製造した。
評価セルをドライボックスから取り出し、ＳＵＳ板で電池電極部を１５Ｎｍのトルクで固定した。ポケットテスター（株式会社カスタム製）を用いて開回路電圧を測定し、３．４Ｖの電圧を示した評価セルについて、充放電装置ＨＪ１００１ＳＤ８（北斗電工株式会社製）を用いてＳＯＣ５０％とした後、周波数応答アナライザ１２６０型（ソーラトロン社製）、ポテンショ／ガルバノスタット１２８７型（ソーラトロン社製）を用いて交流インピーダンス測定を行った。測定条件は、振幅ＡＣ電位２ｍＶ、ＤＣ電位０ＣＶ、測定周波数２５ｍＨｚ〜１００ｋＨｚとした。
[Battery resistance]
An evaluation cell was manufactured in the same manner as the evaluation of battery characteristics.
The evaluation cell was taken out from the dry box, and the battery electrode portion was fixed with a torque of 15 Nm with a SUS plate. After measuring the open circuit voltage using a pocket tester (manufactured by Custom Co., Ltd.), the evaluation cell showing a voltage of 3.4 V was set to SOC 50% using a charge / discharge device HJ1001SD8 (manufactured by Hokuto Denko Co., Ltd.), AC impedance measurement was performed using a frequency response analyzer 1260 type (manufactured by Solartron) and a potentio / galvanostat 1287 type (manufactured by Solartron). The measurement conditions were an amplitude AC potential of 2 mV, a DC potential of 0 CV, and a measurement frequency of 25 mHz to 100 kHz.
［分散性能］
各例で得た電極材において、目視で観察して突起物の個数を計測し、分散性を以下の基準で評価した。
◎：目視で確認できる突起物がない。
○：目視で確認できる突起物の数が１０個未満。
△：目視で確認できる突起物の数が１０個以上１００個未満。
×：目視で確認できる突起物の数が１００個以上。
[Dispersion performance]
In the electrode material obtained in each example, the number of protrusions was measured by visual observation, and the dispersibility was evaluated according to the following criteria.
(Double-circle): There is no protrusion which can be confirmed visually.
○: The number of protrusions that can be visually confirmed is less than 10.
Δ: The number of protrusions that can be visually confirmed is 10 or more and less than 100.
X: The number of protrusions that can be visually confirmed is 100 or more.
［複合金属酸化物の割合］
各例で得た電極合材中の複合金属酸化物の割合を、下式にて算出した。
複合金属酸化物の割合（質量％）＝ＭＤ／（ＭＤ＋ＭＥ＋ＭＦ）×１００
ただし、ＭＤは複合金属酸化物の質量（質量部）、ＭＥはカーボンブラックの質量（質量部）、ＭＦはバインダー樹脂の質量（質量部）である。
[Ratio of composite metal oxide]
The ratio of the composite metal oxide in the electrode mixture obtained in each example was calculated by the following formula.
Ratio of composite metal oxide (mass%) = M D / (M D + M E + M F ) × 100
However, the mass (weight parts) of the M D composite metal oxide, M E is carbon black weight (parts by weight), M F is the binder resin mass (mass parts).
実施例及び比較例で用いたカーボンブラックのＤＢＰ吸油量、ＢＥＴ比表面積、比Ｄ９０／Ｄｍｏｄ、複合金属酸化物の割合、及び評価結果を表２及び表３に示す。 Tables 2 and 3 show the DBP oil absorption, the BET specific surface area, the ratio D 90 / D mod , the ratio of the composite metal oxide, and the evaluation results of the carbon black used in the examples and comparative examples.
表２に示すように、条件（１）〜（３）を満たすカーボンブラックを用いた実施例１〜１１では、カーボンブラックの分散性が良好であり、またレート３０Ｃでの容量維持率が充分に高く、電池抵抗が小さく、優れた電池性能が得られた。また、実施例９〜１１では、カーボンブラックの含有量が少なくても安定した電池性能が得られた。これにより、複合金属酸化物の割合を多くすることで、安定した電池性能を得つつ、電池のエネルギー密度を高くできる。
一方、表３に示すように、条件（２）を満たすものの条件（１）、（３）を満たさないカーボンブラックを用いた比較例１では、カーボンブラックの分散性が充分でなく、電池抵抗が極端に低くなっており、内部短絡のおそれがあった。また、条件（１）〜（３）をいずれも満たさないカーボンブラックを用いた比較例２及び３では、レート３０Ｃでの容量維持率が低く、実施例と比較して電池性能が劣っていた。
また、条件（１）及び（２）を満たすものの条件（３）を満たさない、２種のカーボンブラックをブレンドしたものを用いた比較例４及び５では、カーボンブラックの分散性が充分でなかった。
また、条件（１）〜（３）をいずれも満たさないカーボンブラックを用いた比較例６〜８では、カーボンブラックが異なる以外は同様の組成の電極合材を用いた実施例９〜１１に比べて、レート３０Ｃでの容量維持率が低く、電池性能が劣っていた。
As shown in Table 2, in Examples 1 to 11 using carbon black satisfying the conditions (1) to (3), the dispersibility of the carbon black is good, and the capacity retention rate at the rate of 30C is sufficient. High, low battery resistance, and excellent battery performance was obtained. Moreover, in Examples 9-11, the stable battery performance was obtained even if there was little content of carbon black. Thereby, by increasing the ratio of the composite metal oxide, the energy density of the battery can be increased while obtaining stable battery performance.
On the other hand, as shown in Table 3, in Comparative Example 1 using carbon black that satisfies the condition (2) but does not satisfy the conditions (1) and (3), the dispersibility of the carbon black is not sufficient, and the battery resistance is low. It was extremely low and there was a risk of internal short circuit. Moreover, in Comparative Examples 2 and 3 using carbon black that did not satisfy any of the conditions (1) to (3), the capacity retention rate at the rate of 30 C was low, and the battery performance was inferior to the Examples.
Further, in Comparative Examples 4 and 5 using a blend of two types of carbon blacks that satisfy the conditions (1) and (2) but do not satisfy the condition (3), the dispersibility of the carbon black was not sufficient. .
Moreover, in Comparative Examples 6 to 8 using carbon black that does not satisfy any of the conditions (1) to (3), compared with Examples 9 to 11 using electrode mixtures having the same composition except that carbon black is different. Thus, the capacity retention rate at the rate of 30C was low, and the battery performance was inferior.
Claims (1)
（１）ＢＥＴ比表面積が３５０〜６５０ｍ２／ｇである。
（２）ＤＢＰ吸油量が２７０〜３４０ｃｍ３／１００ｇである。
（３）ＪＩＳ Ｋ６２１７−６に記載の凝集体径の測定方法により測定される、モード径（Ｄｍｏｄ）に対するＤ９０径（Ｄ９０）の比Ｄ９０／Ｄｍｏｄが１．９０〜２．２０である。 An electrode composite comprising carbon black satisfying the following conditions (1) to (3), a composite metal oxide, and a binder resin.
(1) A BET specific surface area is 350 to 650 m 2 / g.
(2) DBP oil absorption is 270-340 cm < 3 > / 100g.
(3) The ratio D 90 / D mod of the D90 diameter (D 90 ) to the mode diameter (D mod ) measured by the method for measuring an aggregate diameter described in JIS K6217-6 is 1.90 to 2.20. is there.
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| WO2016186065A1 (en) * | 2015-05-19 | 2016-11-24 | デンカ株式会社 | Silica-coated carbon black, electrode composition using same, secondary-battery electrode, and secondary battery |
| KR20160139240A (en) | 2015-05-27 | 2016-12-07 | 주식회사 엘지화학 | Electrode mixture, preparation method thereof and secondary battery comprising the same |
| JP6260834B2 (en) * | 2015-06-22 | 2018-01-17 | トヨタ自動車株式会社 | Non-aqueous electrolyte secondary battery |
| JP7137353B2 (en) * | 2018-05-10 | 2022-09-14 | 旭カーボン株式会社 | Carbon black and positive electrode for secondary battery using the same |
| CN114284465B (en) * | 2021-12-22 | 2024-07-19 | 蜂巢能源科技股份有限公司 | Preparation method of positive electrode slurry, positive electrode plate and lithium ion battery |
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