JP2012209153A - Binder for battery electrodes, slurry for battery electrodes, and battery electrodes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a binder for battery electrodes which has a sufficient binding property between active materials and between an active material and a collector, slurry comprising the binder, and battery electrodes formed using the slurry.SOLUTION: Provided are a binder for battery electrodes which comprises latex containing 2,3-dichlorobutadiene polymers, slurry for battery electrodes which comprises the binder and active materials, and battery electrodes.

Description

  The present invention relates to an aqueous binder that can be used for a battery such as a secondary battery, a slurry containing the binder, and a battery electrode formed using the slurry.

  In recent years, a structure in which a conductive or ion conductive substance is bound on a base material has been used for various applications. In particular, it is used as an electrode for a battery. Among batteries, secondary batteries have recently become widespread. As an application in which the secondary battery is used, there is a hybrid type automobile, which has been remarkably spread. Furthermore, it is predicted that a plug-in hybrid system or an electric vehicle will be widely used in the future. Electric bicycles have also begun to spread. Furthermore, the spread of mobile terminals such as mobile phones, notebook computers, and PDAs has become remarkable. The spread of power tools such as electric tools is also remarkable. In addition, smart grids, especially power control systems for home use, have begun to spread. Secondary batteries are used as these power sources, and recently, lithium ion secondary batteries have been frequently used.

  Batteries, particularly lithium secondary batteries, are basically composed of an electrolyte, an electrode in which a positive electrode and a negative electrode active material, and a current collector are bound, and a separator.

  In the applications listed above, secondary batteries are required to be smaller, lighter, thinner and have higher performance. In order to improve the performance of the battery, it is important to improve the performance of each member used in the battery, but it is considered that the performance improvement of the electrode is also an important characteristic. Regarding the electrode, in addition to the influence of the active material or the current collector, the influence of the active material or the polymer material serving as a binder for binding the active material and the current collector is also important. Usually, this binder consists of a composition which uses a polymer for water or an organic solvent as a medium, and applies the slurry which mixed the said composition with the active material etc. to an electrical power collector, Then, an electrode is manufactured by drying. Here, styrene / butadiene rubbers (SBR) using styrene, butadiene, acrylonitrile or the like as a raw material are known as binders contained in the aqueous slurry. SBR is used as a binder for negative electrodes. In the solvent system, fluorine-based resins such as polyvinylidene fluoride (PVDF) are known, and electrodes molded using these binders are known. PVDF is used as a binder for negative electrodes and positive electrodes (Patent Documents 1 and 2).

  However, a lithium ion secondary battery using an electrode formed by using water-based SBR or solvent-based fluororesin as a binder does not have sufficient binding properties between active materials or between an active material and a current collector. Therefore, it is known that when the electrode is folded, peeling occurs between the active material and the current collector in the folded portion, and the electrical characteristics are deteriorated. In addition, it is known that the volume of the active material repeatedly expands and contracts during repeated charging and discharging, and the binder used so far does not have sufficient binding properties. Peeling is observed. Furthermore, a solvent-type binder manufactures a slurry by mixing with a solvent, the said binder, an active material, etc. like N-methylpyrrolidone. The solvent used here tends to be avoided in recent years due to environmental health problems.

  Under such circumstances, an aqueous binder having sufficient binding properties between the active materials and between the active material and the current collector, a slurry containing the binder, and a battery electrode formed using the slurry Was desired.

JP 2006-260782 A JP 2009-245925 A

  The present invention has been made in view of the above problems, and an object of the present invention is an aqueous binder that can be used for a battery such as a secondary battery, and includes an active material or an active material and a current collector. It is an object to provide an aqueous binder having a sufficient binding property, a slurry containing the binder, and a battery electrode formed using the slurry.

  As a result of intensive studies to solve the above problems, the present inventors have newly found that a latex containing a specific polymer is useful as a binder for an electrode, and completed the present invention. It was. That is, the present invention contains a latex containing a 2,3-dichlorobutadiene polymer, a battery electrode binder, the battery electrode binder, and a battery electrode slurry characterized by containing the battery electrode binder and an active material. A battery electrode obtained by applying the slurry to a current collector and drying the slurry.

  Hereinafter, the present invention will be described in detail.

  The binder for battery electrodes of the present invention contains a latex containing a 2,3-dichlorobutadiene polymer.

  The 2,3-dichlorobutadiene polymer contained in the latex contained in the binder for battery electrodes of the present invention is a 2,3-dichlorobutadiene homopolymer or a 2,3-dichlorobutadiene copolymer. The 2,3-dichlorobutadiene homopolymer is obtained by polymerizing a monomer of 2,3-dichlorobutadiene. The 2,3-dichlorobutadiene copolymer is obtained by polymerizing a monomer of 2,3-dichlorobutadiene and another monomer (monomer) copolymerizable therewith. Examples of the monomer (monomer) copolymerizable with the monomer of 2,3-dichlorobutadiene include isomers of 2,3-dichlorobutadiene such as 1,2-dichlorobutadiene and 1,3-dichlorobutadiene. , Ethylene, propylene, chloroprene, butadiene, isoprene, vinyl chloride, vinylidene chloride, vinyl acetate, styrene, acrylonitrile, maleic anhydride, acrylic acid ester, methacrylic acid ester and the like. These copolymerization monomers can be used alone or in combination of two or more. The composition of the copolymerizable monomer can be used as long as the properties of 2,3-dichlorobutadiene are not impaired, and the monomer charge composition of the copolymerizable monomer in the copolymer is not particularly limited. In order to obtain higher binding properties between the active materials or between the active material and the current collector, the content is preferably more than 0% by weight and 75% by weight or less, more preferably more than 0% by weight and 45% by weight.

  Latex containing a 2,3-dichlorobutadiene polymer is generally a monomer of 2,3-dichlorobutadiene, or another monomer copolymerizable with a monomer of 2,3-dichlorobutadiene. Is obtained by emulsion polymerization. As an example of emulsion polymerization, water, a monomer, an emulsifier / dispersant, a polymerization initiator, a chain transfer agent, and the like may be emulsified and polymerized. Each raw material may be added all at once, sequentially, or dividedly.

  The emulsifier / dispersant used for the polymerization is not particularly limited, and for example, carboxylic acid type, sulfonic acid type, sulfate ester type anionic emulsifiers, nonionic emulsifiers, water-soluble polymers and the like are used. Examples of the carboxylic acid type anionic emulsifier include an alkali metal salt of disproportionated rosin acid, an ammonium salt of disproportionated rosin acid, an amine salt of disproportionated rosin acid, and the like. Examples of the emulsifier include alkali metal salts of alkyl sulfonic acids, amine salts of alkyl sulfonic acids, ammonium salts of alkyl sulfonic acids, alkali metal salts of alkyl aryl sulfonic acids, ammonium salts of alkyl aryl sulfonic acids, and alkyl aryl sulfonic acids. Examples include amine salts, condensates of sodium naphthalene sulfonate and formaldehyde, alkali metal salts and alkyl salts of alkyl diphenyl ether disulfonic acids. Examples of sulfate-type anionic emulsifiers include alkali metal salts of alkyl sulfates, Alkyl sulfate Ammonium salt of stell, amine salt of alkyl sulfate ester, alkali metal salt of alkyl aryl sulfate ester, ammonium salt of alkyl aryl sulfate ester, amine salt of alkyl aryl sulfate ester, alkali metal salt of polyoxyethylene alkyl aryl ether sulfate ester, Ammonium salt of polyoxyethylene alkylaryl ether sulfate, amine salt of polyoxyethylene alkylaryl ether sulfate, alkali metal salt of polyoxyethylene alkyl ether sulfate, ammonium salt of polyoxyethylene alkyl ether sulfate, polyoxyethylene Examples thereof include amine salts of alkyl ether sulfates, and nonionic emulsifiers include, for example, polyoxyethylene alkyl ethers, Polyoxyethylene alkyl phenols, sorbitan fatty acid esters, polyoxyethylene acyl esters, etc. Examples of the water-soluble polymer include polyvinyl alcohol and the like. The amount used is not particularly limited, but is 0.5 to 10 parts by weight with respect to 100 parts by weight of the monomer in order to maintain mechanical stability during polymerization and to further increase the binding property. Is preferred.

  As the polymerization initiator, a known free radical generating substance, for example, a persulfate such as potassium persulfate or ammonium persulfate, or an inorganic or organic peroxide such as hydrogen peroxide or t-butyl hydroperoxide may be used. it can. These may be used alone or in a redox system with a reducing substance such as hydrosulfite, thiosulfate, thiosulfite, ferrous sulfate, ascorbic acid, organic amine, etc. Therefore, a redox system is preferable. The amount used is not particularly limited, but is preferably 0.001 to 2 parts by weight with respect to 100 parts by weight of the monomer in order to further control the polymerization and achieve an appropriate polymerization time. More preferred is -0.5 part by weight.

  Examples of chain transfer agents include molecular weight regulators such as alkyl mercaptans, halogenated hydrocarbons, dialkylxanthogen disulfides, tetraalkylthiuram disulfides, α-methylstyrene dimers, 1,1-diphenylethylene, and sulfur. The amount used is not particularly limited, but is preferably 0.01 to 3 parts by weight with respect to 100 parts by weight of the monomer in order to further increase the binding property.

  Although it does not specifically limit as temperature which can superpose | polymerize, in order to control superposition | polymerization more and to make it suitable polymerization time, the range of 0-80 degreeC is preferable, and the range of 10-50 degreeC is further more preferable.

  The polymerization reaction of the present invention is terminated by adding a polymerization terminator.

  Although the polymerization end time is not particularly limited, in order to obtain sufficient binding properties, it is preferable to carry out the polymerization until the monomer conversion rate is 60 to 100%, and the polymerization is performed to 95 to 100%. More preferably it is performed.

  When the monomer remains in the obtained latex, the monomer may be removed by a monomer strip or the like in order to improve environmental safety.

  As the polymerization terminator, a commonly used terminator, for example, hindered phenol compounds such as 2,6-t-butyl-4-methylphenol, phenothiazine, diethylhydroxylamine and the like can be used. These terminators can be added directly to the latex dissolved in an organic solvent and / or 2,3-DCB monomer, or added in water, and the addition reaches a predetermined conversion rate. It may be added at that time.

  Latex containing 2,3-dichlorobutadiene polymer is produced by polymerization methods other than emulsion polymerization methods such as bulk polymerization, suspension polymerization, and solution polymerization. For example, the medium is volatilized by a method such as vacuum drying, spray dryer, drum dryer, vacuum extruder, etc. to obtain a solid 2,3-dichlorobutadiene polymer, and then the obtained solid 2,3 -It can also manufacture by what is called a post-emulsification method which dissolves a dichlorobutadiene polymer in a solvent, emulsifies by adding water, an emulsifier, etc., and removes a solvent.

  The solid content of the latex containing the 2,3-dichlorobutadiene polymer is not limited. However, when the slurry is applied, the viscosity of the latex is prevented from being increased to facilitate mixing when producing the slurry. In order to improve the workability, the content is preferably 65% by weight or less.

  The binder for battery electrodes of the present invention is not only for latex containing 2,3-dichlorobutadiene polymer, but also for adjusting the viscosity of the binder, preventing aggregation of latex during storage, mechanical stability or freezing stability, etc. In order to give, you may contain generally known surfactant, a dispersing agent, a water-soluble polymer, etc.

  The battery electrode slurry of the present invention contains the battery electrode binder and the active material of the present invention, and is used to form a battery electrode, and is used for a manganese dry battery or a secondary battery electrode. Used to form. Particularly preferred are electrodes for secondary batteries such as nickel metal hydride batteries, nickel cadmium secondary batteries, lithium ion secondary batteries, and more preferably used for forming electrodes for lithium ion secondary batteries.

  The battery electrode slurry of the present invention is prepared by mixing the battery electrode binder of the present invention and an active material.

Any active material that is generally known can be used as the battery electrode slurry of the present invention. Examples of the active material for the negative electrode include amorphous materials such as amorphous carbon, graphite, carbon fluoride, carbon fiber, resin-fired carbon, graphite whiskers, polymer compounds such as polyacene, conductive organic compounds, and lithium alloys. Examples thereof include metals such as silicon and tin. Examples of the positive electrode active material include metal oxides such as manganese dioxide, molybdenum trioxide, divanadium pentoxide, and iron oxides, composite oxides including lithium such as LiCoO ₂ , LiMnO ₂ , and LiNiO ₂ , LiFePO _{4, and the} like. Composite metal oxides containing lithium, transition metal sulfides such as FeS ₂ , transition metal oxides such as Cu ₂ V ₂ O ₃ , metal fluorides such as NiF _2, and polymer compounds such as polyacetylene. These active materials can be used alone or in combination of two or more.

  The battery electrode slurry of the present invention may contain generally known surfactants, dispersants, water-soluble polymers and the like in order to adjust the viscosity and application workability of the slurry. Moreover, it is preferable that the slurry for battery electrodes of this invention contains an electroconductivity imparting agent, in order to make electroconductivity higher. As the conductivity-imparting agent, for example, conductive carbon such as acetylene black, ketjen black, carbon black, and graphite can be used.

  As a method for producing the battery electrode slurry of the present invention, a generally known method is used. Specifically, it is produced by mixing a battery electrode binder and an active material. The mixing is not limited as long as it is a commonly used mixing apparatus. For example, a ball mill, a homogenizer, an ultrasonic disperser, a planetary mixer, a kneader, or the like can be used.

  The battery electrode binder that constitutes the battery electrode slurry of the present invention is not particularly limited, but maintains sufficient binding between the active materials or between the active material and the current collector to facilitate the flow of electricity. In order to improve the battery characteristics, the solid content of the latex is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the active material. .

  The battery electrode of the present invention is formed from the battery electrode slurry of the present invention and a current collector. Specifically, it is obtained by applying and drying the slurry for battery electrodes of the present invention on a current collector.

  The current collector used in the present invention is not limited as long as it is generally used. For example, metal materials such as iron, copper, aluminum, nickel, stainless steel, titanium, tantalum, gold, platinum, etc. Is used. Aluminum is preferable for the positive electrode, and copper is preferable for the negative electrode.

  If the method for apply | coating the said slurry on the electrical power collector for manufacturing the battery electrode obtained by this invention is a general method, there will be no restriction | limiting. For example, methods such as roll coater, gravure, air knife, comma bar, and dipping are used. As a drying method, a method such as standing drying, air drying, hot air drying, infrared drying, or the like is used. The drying temperature and time are not particularly limited, but it is preferable that water is sufficiently volatilized in order to maintain battery characteristics.

  According to the present invention, it is possible to obtain a battery electrode binder capable of sufficiently binding active materials to each other and an active material and a current collector. Furthermore, an electrode formed using a slurry containing the binder can be applied to a battery having high battery characteristics, which has been difficult with conventional electrodes, and can be applied to a very wide range of industries.

  EXAMPLES Next, the present invention will be described in more detail based on examples, but these are examples for helping understanding of the present invention, and the present invention is not limited by these examples.

  In addition, the value used in these Examples was obtained based on the following measuring methods.

<Raw material>
The following raw materials were used in the examples of the present invention.

(1) Styrene-Butadiene Rubber (SBR)-Raw Material for Water-based Binder TRD2001 made by JSR Corporation
(2) Polyvinylidene fluoride (PVDF) -raw material for solvent binder KF polymer 1010 manufactured by Kureha Corporation
(3) Graphite-active material for negative electrode Spherical graphite powder CGB-10 manufactured by Nippon Graphite Industries Co., Ltd.
(4) Acetylene black-conductivity imparting material Denka Black (5) Carboxymethylcellulose (CMC) manufactured by Denki Kagaku Kogyo Co., Ltd.
Daicel Chemical Industries, Ltd. (6) N-methylpyrrolidone (NMP)
Wako Pure Chemical Industries, Ltd. (7) Lithium Cobalt-Active Material for Positive Electrode Cell Seed C-5H, manufactured by Nippon Chemical Industry Co., Ltd.
(8) Copper foil-negative electrode current collector C1220P (100 mm × 100 mm × thickness 0.05 mm) manufactured by Nippon Test Panel Co., Ltd.
(9) Aluminum foil-positive electrode current collector Toyo Aluminum Echo Products Co., Ltd. cooking foil (250 mm x 100 mm x thickness 0.01 mm)
<Preparation of slurry>
A predetermined amount of binder, active material, carboxymethylcellulose (CMC), and acetylene black are charged together with beads into a 500 ml polyethylene bottle, and kneaded on a ball mill at 270 rpm for 12 hours to prepare a slurry for battery electrodes. did.

<Preparation of electrode>
Using a bar coater (RDS75, manufactured by Webster), the slurry was applied on the current collector so as to have a constant thickness (100 μm), and dried with hot air at 130 ° C. for 30 minutes to prepare an electrode.

  In the case of a slurry using a negative electrode active material (graphite), an electrode was obtained using a negative electrode current collector (copper foil). In the case of a slurry using a positive electrode active material (lithium cobaltate), an electrode was obtained using a positive electrode current collector (aluminum foil).

<Binding property>
When the portion on which the slurry on the electrode was applied and dried was rubbed with the following resin, the number of times the current collector surface was exposed by peeling was measured as the number of peeling.

(1) Soft resin (pilot friction ball body rear rubber)
(2) Hard resin (Pilot's friction ball cap tip resin)
<Electrical conductivity>
The tip of the test bar (manufactured by Sanwa Denki Keiki Co., Ltd., AP-33) was brought into contact with the surface of the slurry on the negative electrode, and whether or not electricity was passed was measured in a resistance value measurement mode.

Examples 1-5
1200 g (100 of monomers) of the composition shown in Table 1 (2,3-dichlorobutadiene, 1,2-dichloro-1,3-butadiene, 1,3-dichloro-1,3-butadiene, and 2-chlorobutadiene) Parts by weight), 4 g (0.3 parts by weight) of n-dodecyl mercaptan, 250 g (20.8 parts by weight) of disproportionated potassium rosinate, 20 g (1.7 parts by weight) of a condensate of sodium naphthalenesulfonate and formaldehyde , 20 g (1.7 parts by weight) of sodium oleate, 15 g (1.3 parts by weight) of sodium hydroxide and 5935 g (495 parts by weight) of ion-exchanged water were charged into a 10 L autoclave equipped with a stirrer at 20 ° C. and nitrogen atmosphere After stirring for 30 minutes, 0.5 g (0.04 parts by weight) of ascorbic acid was added, and an aqueous potassium persulfate solution (potassium persulfate 0.4 (0.03 parts by weight), 0.1 g (0.08 parts by weight) of sodium anthraquinone sulfonate dissolved in 400 g (33.3 parts by weight) of ion-exchanged water) and continuously added to polymerize Started. The addition of the potassium persulfate aqueous solution was stopped at a conversion rate of 80%, and the mixture was aged for 1 hour. Thereafter, 1200 g (100 parts by weight) of the monomer having the same composition as that initially charged was added and stirred for 30 minutes, and then 0.6 g (0.05 part by weight) of ascorbic acid was added. (0.4 g (0.03 parts by weight) potassium persulfate and 0.1 g (0.008 parts by weight) sodium anthraquinone sulfonate dissolved in 400 g (33.3 parts by weight) ion-exchanged water) The polymerization was restarted by continuous addition. Total conversion rate was 86% (conversion rate was calculated by solid content measurement. That is, about 2 g of latex was precisely weighed, and the solid content was calculated by measuring the weight after drying at 170 ° C. for 20 minutes. The conversion rate was calculated from the fraction value.) When addition of potassium persulfate aqueous solution was stopped, the mixture was aged for 1 hour. After that, again, 1200 g (100 parts by weight) of the monomer having the same composition as that initially charged was added and stirred for 30 minutes, and then 0.6 g (0.05 part by weight) of ascorbic acid was added. A potassium sulfate aqueous solution (potassium persulfate 0.4 g (0.03 parts by weight) and sodium anthraquinonesulfonate 0.1 g (0.008 parts by weight) were dissolved in 400 g (33.3 parts by weight) of ion-exchanged water to prepare. The continuous addition of the product was started. Addition of potassium persulfate aqueous solution is stopped at a total conversion rate of 99% or more, and 0.4 g (0.03 parts by weight) of phenothiazine and 0.4 g (0.03 parts by weight) of t-butylcatechol are added and listed in Table 1. 1 to 5 (battery electrode binder) were obtained.

実施例６〜９
表２に示す通り、ラテックス２、４、５、カルボキシメチルセルロース（ＣＭＣ）、及び水を、１倍量の仕込み重量で、５００ｍｌポリエチレン製ボトルにビーズとともに投入し、ボールミル上で回転数２７０ｒｐｍ、１２時間の条件で混練し、電池電極用バインダー１〜４を得た。

Examples 6-9
As shown in Table 2, latexes 2, 4, 5, carboxymethylcellulose (CMC), and water were charged together with beads into a 500 ml polyethylene bottle at a charge amount of 1 time, and the number of rotations was 270 rpm on a ball mill for 12 hours. The battery electrode binders 1 to 4 were obtained.

実施例１０〜１９
表３に示す通り、電池電極用バインダー（ラテックス１〜５）、負極用活物質として黒鉛、アセチレンブラック、カルボキシメチルセルロース（ＣＭＣ）、及び水を、１倍量の仕込み重量で、５００ｍｌポリエチレン製ボトルにビーズとともに投入し、ボールミル上で回転数２７０ｒｐｍ、１２時間の条件で混練し、電池電極用スラリーを得た。得られたスラリーを、バーコーターを用いて負極用集電体である銅箔上に塗布、乾燥することにより、電池用電極（負極）を得た。

Examples 10-19
As shown in Table 3, the battery electrode binder (latex 1 to 5), the negative electrode active material graphite, acetylene black, carboxymethyl cellulose (CMC), and water in a 500 ml polyethylene bottle at a charge amount of 1 time. This was charged together with the beads and kneaded on a ball mill under the conditions of 270 rpm and 12 hours to obtain a battery electrode slurry. The obtained slurry was applied onto a copper foil as a negative electrode current collector using a bar coater and dried to obtain a battery electrode (negative electrode).

得られた電極を用いて結着性と通電性の評価を行った。その結果を表３に合わせて示す。得られた電極は良好な結着性、及び通電性を示していた。

The obtained electrode was used to evaluate binding properties and electrical conductivity. The results are also shown in Table 3. The obtained electrode exhibited good binding properties and electrical conductivity.

Examples 20-24
As shown in Table 4, slurry for battery electrodes was obtained according to the method described in Examples 10 to 19 except that the binder for battery electrodes was changed to binders 1 to 4. The obtained slurry was applied onto a copper foil as a negative electrode current collector using a bar coater and dried to obtain a battery electrode (negative electrode).

得られた電極を用いて結着性と通電性の評価を行った。その結果を表４に合わせて示す。得られた電極は良好な結着性、及び通電性を示していた。

The obtained electrode was used to evaluate binding properties and electrical conductivity. The results are also shown in Table 4. The obtained electrode exhibited good binding properties and electrical conductivity.

Comparative Examples 1-2
As shown in Table 5, electrodes were obtained according to the methods described in Examples 10 to 19 except that the binder for battery electrodes was changed from latex 1 to 5 to SBR.

得られた電極を用いて結着性と通電性の評価を行った。その結果を表５に合わせて示す。得られた電極は、ＳＢＲを用いていたために、結着性が劣っていた。

The obtained electrode was used to evaluate binding properties and electrical conductivity. The results are also shown in Table 5. Since the obtained electrode used SBR, the binding property was inferior.

Comparative Examples 3-6
As shown in Table 5, an electrode was obtained according to the method described in Examples 10 to 19 except that the battery electrode binder was changed from latex 1 to 5 to PVDF and water was changed to NMP.

  The obtained electrode was used to evaluate binding properties and electrical conductivity. The results are also shown in Table 5. Since the obtained electrode used PVDF, the binding property was inferior.

Examples 25-30
As shown in Table 6, slurry for battery electrodes was obtained in accordance with the method described in Examples 10 to 19 except that graphite was changed to lithium cobaltate as the positive electrode active material. The obtained slurry was applied onto an aluminum foil as a positive electrode current collector using a bar coater and dried to obtain a battery electrode (positive electrode).

得られた電極を用いて結着性と通電性の評価を行った。その結果を表６に合わせて示す。得られた電極は、良好な結着性、及び通電性を示していた。

The obtained electrode was used to evaluate binding properties and electrical conductivity. The results are also shown in Table 6. The obtained electrode showed good binding properties and electrical conductivity.

Examples 31-35
As shown in Table 7, a battery electrode slurry was obtained according to the method described in Examples 10 to 19 except that the battery electrode binder was changed to binders 1 to 4. The obtained slurry was applied onto an aluminum foil as a positive electrode current collector using a bar coater and dried to obtain a battery electrode (positive electrode).

得られた電極を用いて結着性と通電性の評価を行った。その結果を表７に合わせて示す。得られた電極は、良好な結着性、及び通電性を示していた。

The obtained electrode was used to evaluate binding properties and electrical conductivity. The results are also shown in Table 7. The obtained electrode showed good binding properties and electrical conductivity.

  The battery electrode binder of the present invention and the electrode using the battery electrode slurry containing the binder have sufficient binding properties between the active materials or between the active material and the current collector, and have excellent battery characteristics. Can be obtained.

Claims (3)

A battery electrode binder comprising a latex containing a 2,3-dichlorobutadiene polymer. A battery electrode slurry comprising the battery electrode binder according to claim 1 and an active material. A battery electrode obtained by applying and drying the battery electrode slurry according to claim 2 on a current collector.