JPH07161350A - Manufacture of electrode slurry for lithium battery - Google Patents
Manufacture of electrode slurry for lithium batteryInfo
- Publication number
- JPH07161350A JPH07161350A JP5307744A JP30774493A JPH07161350A JP H07161350 A JPH07161350 A JP H07161350A JP 5307744 A JP5307744 A JP 5307744A JP 30774493 A JP30774493 A JP 30774493A JP H07161350 A JPH07161350 A JP H07161350A
- Authority
- JP
- Japan
- Prior art keywords
- solvent
- viscosity
- added
- poise
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Colloid Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、リチウム電池用電極
スラリーの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a lithium battery electrode slurry.
【０００２】[0002]
【従来の技術】リチウム電池の電極としてスパイラル形
電極構造を有するものが広く採用されており、この電極
は電極スラリーを芯材としてのシート状集電体上に塗布
し、この後乾燥工程、圧延工程を経て製造される。この
うちの電極スラリーの製造は、従来、以下に示す手順で
行われていた。2. Description of the Related Art As an electrode of a lithium battery, one having a spiral electrode structure has been widely adopted. This electrode is prepared by applying an electrode slurry onto a sheet-like current collector as a core material, followed by a drying step and rolling. It is manufactured through steps. The production of the electrode slurry among them has been conventionally performed by the following procedure.
【０００３】先づ始めに、粉末状電極活物質と粉末状の
導電材を乾式混合し、この混合物に結着剤を加えるとと
もに所望の粘度にするために所定量の溶剤を湿式条件下
で加えて混練することでスラリーを作るようにしてい
た。そして、前記溶剤を前記混合物に加える際には、前
記所定量の溶剤の全量を一度に加えていた。First, a powdery electrode active material and a powdery conductive material are dry-mixed, a binder is added to this mixture, and a predetermined amount of a solvent is added under a wet condition in order to obtain a desired viscosity. It kneaded and kneaded to make a slurry. Then, when the solvent was added to the mixture, the entire amount of the predetermined amount of solvent was added at one time.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記従
来の方法で作製された電極スラリーは前記乾燥工程にお
いてこのスラリーに含まれた溶剤を蒸発させるためにど
うしても乾燥時間が長くなるため、乾燥に要するエネル
ギーコストが増大したり製造速度が低下するなどして生
産性が低下してしまうという問題があった。However, since the electrode slurry prepared by the above-mentioned conventional method inevitably elongates the drying time in order to evaporate the solvent contained in the slurry in the above-mentioned drying step, the energy required for the drying is increased. There has been a problem that productivity is lowered due to an increase in cost and a decrease in manufacturing speed.
【０００５】この発明は以上の問題を解決するものであ
って、乾燥工程における乾燥時間を短縮して生産性を向
上することのできるリチウム電池用電極スラリーの製造
方法を提供するものである。The present invention solves the above problems and provides a method for producing a lithium battery electrode slurry which can shorten the drying time in the drying step and improve the productivity.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するた
め、本発明では、電極活物質、導電材、結着剤及び溶剤
を混練してなるリチウム電池用電極スラリーの製造方法
において、前記電極活物質、前記導電材、前記結着剤及
び前記溶剤を混練する際に前記溶剤の量を調整してこの
混練物の粘度を３００〜６０００００ポイズに調整し、
その後さらに溶剤を加えて前記混練物を所定の粘度にな
るまで混練するものである。To achieve the above object, the present invention provides a method for producing an electrode slurry for a lithium battery, which comprises kneading an electrode active material, a conductive material, a binder and a solvent. When kneading the substance, the conductive material, the binder and the solvent, the amount of the solvent is adjusted to adjust the viscosity of the kneaded product to 300 to 600,000 poises,
Thereafter, a solvent is further added to knead the kneaded product until a predetermined viscosity is obtained.
【０００７】また、前記混練物の粘度を３００〜６００
０００ポイズに調整する際には、加える溶剤量を前記混
練物に加える溶剤の全量の２０〜７０重量％にするとと
もに、その後さらに溶剤を加えて混練した後の前記所定
の粘度を２０〜７０ポイズにすることが望ましい。Further, the viscosity of the kneaded product is 300 to 600.
When adjusting to 000 poise, the amount of the solvent to be added is set to 20 to 70% by weight of the total amount of the solvent to be added to the kneaded product, and then the predetermined viscosity after kneading by further adding the solvent is 20 to 70 poise. Is desirable.
【０００８】[0008]
【作用】本発明の上記構成によれば、前記電極活物質、
前記導電材、前記結着剤及び前記溶剤を混練する際に前
記溶剤の量を調整してこの混練物の粘度を３００〜６０
００００ポイズに調整すると、前記電極活物質、前記導
電材、前記結着剤は部分的に凝集することなく前記溶剤
に均一に分散混合されるので、その後さらに所定の粘度
になるために加える溶剤は少量で済む。したがって、従
来の製造方法に比べて必要な溶剤は少量で済むため、得
られた電極スラリーを電極シートの芯材に塗布した場合
には乾燥工程でのスラリーの乾燥時間を短縮できる。According to the above configuration of the present invention, the electrode active material,
When the conductive material, the binder and the solvent are kneaded, the amount of the solvent is adjusted so that the viscosity of the kneaded material is 300 to 60.
When the porosity is adjusted to 0000 poise, the electrode active material, the conductive material, and the binder are uniformly dispersed and mixed in the solvent without partially aggregating. A small amount is enough. Therefore, a small amount of solvent is required as compared with the conventional manufacturing method, and thus when the obtained electrode slurry is applied to the core material of the electrode sheet, the drying time of the slurry in the drying step can be shortened.
【０００９】[0009]
【実施例】以下、スパイラル形リチウム電池を対象とし
た本発明の好適な一実施例を図面を参照して詳細に説明
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention for a spiral type lithium battery will be described in detail below with reference to the drawings.
【００１０】［正極スラリーの製造方法］正極活物質と
してのリチウム−金属複合酸化物としてのＬｉＣｏＯ2
と、導電剤としての黒鉛及びアセチレンブラックと、結
着剤としてのポリフッ化ビニリデン（ＰＶＤＦ）とを混
合して作製した粉体に、溶剤としてのＮ−メチル−２−
ピロリジノンをこの粉体の２０重量％加え６０分間混練
して粘度１５００ポイズとした後、さらに同溶剤を前記
粉体の４０重量％加えて３０分間撹はんして粘度２８ポ
イズの正極スラリーとした。ここで、混合粉体に最初に
加える溶剤量は加える溶剤の全量の約３３重量％とな
る。[Method for producing positive electrode slurry] LiCoO 2 as a lithium-metal composite oxide as a positive electrode active material
Powder of graphite and acetylene black as a conductive agent and polyvinylidene fluoride (PVDF) as a binder, and N-methyl-2- as a solvent.
Pyrrolidinone was added at 20% by weight of this powder and kneaded for 60 minutes to a viscosity of 1500 poise, and then the same solvent was added at 40% by weight of the powder and stirred for 30 minutes to obtain a positive electrode slurry having a viscosity of 28 poise. . Here, the amount of the solvent initially added to the mixed powder is about 33% by weight of the total amount of the solvent added.
【００１１】［後加工］完成した正極スラリーを、コー
ティング装置等で厚さ２０μｍの金属薄板（銅、アルミ
ニウム、ステンレススチール、ニッケル、チタン等）に
塗布した後、連続的に乾燥炉を通過させて乾燥固化させ
た後、プレス用ロ―ラ等を通過させることによって均一
な厚み（０．２ｍｍ）の正極を形成する。その後定寸カ
ット、正極リード板溶接などの二次加工工程により正極
を完成する。[Post-processing] After coating the completed positive electrode slurry on a thin metal plate (copper, aluminum, stainless steel, nickel, titanium, etc.) having a thickness of 20 μm with a coating device or the like, it is continuously passed through a drying furnace. After being dried and solidified, a positive electrode having a uniform thickness (0.2 mm) is formed by passing it through a pressing roller or the like. After that, the positive electrode is completed by secondary processing steps such as constant-size cutting and positive electrode lead plate welding.
【００１２】［負極スラリーの製造方法］Ｌｉイオンの
ドープ，脱ドープが可能である炭素質材料としてのピッ
チコークスを６９重量％、導電剤としてのアセチレンブ
ラックを１０重量％、フッ素系結着剤を２１重量％混合
して作製した粉体に、溶剤としてのＮ−メチル−２−ピ
ロリジノンをこの粉体の７０重量％加えて６０分間混練
して粘度を１５００ポイズとした後、さらに同溶剤を前
記粉体の７０重量％加えて３０分間撹はんして粘度２８
ポイズの負極スラリーとした。ここで、混合粉体に最初
に加える溶剤量は加える溶剤の全量の約５０重量％とな
る。[Method for producing negative electrode slurry] 69% by weight of pitch coke as a carbonaceous material capable of doping and dedoping with Li ions, 10% by weight of acetylene black as a conductive agent, and a fluorine-based binder. To the powder prepared by mixing 21% by weight, 70% by weight of N-methyl-2-pyrrolidinone as a solvent was added and kneaded for 60 minutes to a viscosity of 1500 poise. Add 70% by weight of powder and stir for 30 minutes to obtain a viscosity of 28
It was a poise negative electrode slurry. Here, the amount of the solvent initially added to the mixed powder is about 50% by weight of the total amount of the solvent added.
【００１３】［後加工］完成した負極スラリーを、コー
ティング装置等で厚さ１０μｍの金属薄板（銅、アルミ
ニウム、ステンレススチール、ニッケル、チタン等）に
塗布した後、連続的に乾燥炉を通過させて乾燥固化させ
た後、プレス用ロ―ラ等を通過させることによって均一
な厚み（０．２ｍｍ）の負極を形成する。その後定寸カ
ット、負極リード板溶接などの二次加工工程により負極
を完成する。[Post-processing] The completed negative electrode slurry is applied to a metal thin plate (copper, aluminum, stainless steel, nickel, titanium, etc.) having a thickness of 10 μm by a coating device or the like, and then continuously passed through a drying furnace. After being dried and solidified, a negative electrode having a uniform thickness (0.2 mm) is formed by passing it through a pressing roller or the like. After that, the negative electrode is completed by secondary processing steps such as constant-size cutting and welding of the negative electrode lead plate.
【００１４】次に、本実施例の作用について説明する。
図１は正極シートの時間に対する乾燥曲線（８０℃ＤＲ
Ｙ）、表１は正極シートの乾燥時間と正極スラリーの塗
布面のダマ（粉体の部分凝集）によるキズの発生数をそ
れぞれ本発明品と従来品とで比較して示している。図１
及び表１から明らかなように、スラリーの乾燥時間は従
来品の４５分間に対し本発明品では３０分間に短縮され
ている。また、塗布面のダマによるキズは、従来品では
１００個中７２個発生しているのに対し本発明品では全
く発生していないことが分かる。また、図２は溶剤量
（電極活物質、導電剤及び結着剤の混合粉体に対する重
量％）に対する正極スラリーの粘度変化を本発明品と従
来品とで比較して示したグラフであり、スラリーを２８
００ＣＰ（２８ポイズ）の粘度にするために、従来品で
は混合粉体の量に対して８０重量％必要であるのに対
し、本発明品では６０重量％で済む。なお、従来品は本
実施例と同じスラリー材料を用いており、混合粉体に対
して８０重量％の溶剤の全量を一度に加えて９０分間撹
はんして粘度を２８ポイズとした。Next, the operation of this embodiment will be described.
Figure 1 shows the drying curve of the positive electrode sheet against time (80 ° C DR
Y) and Table 1 show the drying time of the positive electrode sheet and the number of scratches caused by lumps (partial agglomeration of powder) on the surface coated with the positive electrode slurry, respectively, for the product of the present invention and for the conventional product. Figure 1
Further, as is clear from Table 1, the drying time of the slurry is shortened to 30 minutes in the product of the present invention compared to 45 minutes in the conventional product. Further, it can be seen that the conventional product has 72 scratches due to lumps on the coated surface, whereas the product of the present invention has no scratches. Further, FIG. 2 is a graph showing a change in viscosity of the positive electrode slurry with respect to the amount of solvent (% by weight based on the mixed powder of the electrode active material, the conductive agent and the binder) in the product of the present invention and the conventional product, 28 slurries
In order to obtain a viscosity of 00 CP (28 poise), the conventional product needs 80% by weight with respect to the amount of the mixed powder, whereas the product of the present invention requires 60% by weight. The conventional product uses the same slurry material as in this embodiment, and the total amount of the solvent of 80% by weight to the mixed powder is added all at once and stirred for 90 minutes to adjust the viscosity to 28 poise.
【００１５】[0015]
【表１】 負極スラリー及びシートに関しても、同様な結果を得て
おり、図３は負極シートの時間に対する乾燥曲線（６０
℃ＤＲＹ）、表２は負極シートの乾燥時間と負極スラリ
ーの塗布面のダマによるキズの発生数をそれぞれ本発明
品と従来品とで比較して示している。図３及び表２から
明らかなように、スラリーの乾燥時間は従来品の６０分
間に対し本発明品では４０分間に短縮されている。ま
た、塗布面のダマによるキズは、従来品では１００個中
６３個発生しているのに対し本発明品では全く発生して
いないことが分かる。また、図４は溶剤量（電極活物
質、導電剤及び結着剤の混合粉体に対する重量％）に対
する負極スラリーの粘度変化を本発明品と従来品とで比
較して示したグラフであり、スラリーを２８００ＣＰ
（２８ポイズ）の粘度にするために、従来品では混合粉
体の量に対して２００重量％必要であるのに対し、本発
明品では１４０重量％で済む。なお、従来品は本実施例
と同じスラリー材料を用いており、混合粉体に対して２
００重量％の溶剤の全量を一度に加えて９０分間撹はん
して粘度を２８ポイズとした。[Table 1] Similar results were obtained for the negative electrode slurry and sheet, and FIG. 3 shows the drying curve (60%) of the negative electrode sheet.
Table 2 shows the drying time of the negative electrode sheet and the number of scratches caused by lumps on the negative electrode slurry-coated surface of the present invention product and the conventional product, respectively. As is apparent from FIG. 3 and Table 2, the drying time of the slurry is shortened to 40 minutes in the product of the present invention compared to 60 minutes in the conventional product. Further, it can be seen that the conventional product has 63 scratches due to lumps on the coated surface, whereas the product of the present invention has no scratches. Further, FIG. 4 is a graph showing a change in the viscosity of the negative electrode slurry with respect to the amount of solvent (% by weight based on the mixed powder of the electrode active material, the conductive agent and the binder) between the product of the present invention and the conventional product, 2800 CP of slurry
In order to obtain a viscosity of (28 poise), the conventional product needs 200% by weight with respect to the amount of the mixed powder, whereas the product of the present invention requires 140% by weight. In addition, the conventional product uses the same slurry material as that of the present embodiment, and 2
The total amount of 00 wt% solvent was added all at once and stirred for 90 minutes to a viscosity of 28 poise.
【００１６】[0016]
【表２】 以上、説明した製造方法によれば、電極活物質、導電材
及び結着剤の混合粉体に対して少量の溶剤を加えて高粘
度で練ると、粉体同士のズリ効果により粉体は部分的に
凝集することなく均一に分散混合される。したがって、
電極スラリーとして必要な粘度にするためにさらに加え
る溶剤量を減らすことができるので、従来に比べて混合
粉体に加える溶剤の全量を低減できる。したがって、後
工程でのスラリーの乾燥時間を短縮することができる。
また、粉体はズリ効果により均一に分散混合されて部分
凝集を防止できるため、電極シートを作製するために金
属薄板に塗布した場合には、表面にキズのない均一な塗
布状態を実現できる。[Table 2] According to the manufacturing method described above, when a small amount of solvent is added to the mixed powder of the electrode active material, the conductive material, and the binder and the mixture is kneaded at a high viscosity, the powder partially forms due to the sliding effect between the powders. It is uniformly dispersed and mixed without agglomerating. Therefore,
Since it is possible to further reduce the amount of solvent added to obtain the viscosity required for the electrode slurry, it is possible to reduce the total amount of solvent added to the mixed powder as compared with the conventional case. Therefore, the drying time of the slurry in the post process can be shortened.
Further, the powder can be uniformly dispersed and mixed by the sliding effect to prevent partial agglomeration. Therefore, when the powder is applied to a thin metal plate to prepare an electrode sheet, it is possible to achieve a uniform coating state without scratches on the surface.
【００１７】なお、本実施例では、混合粉体に対する最
初の溶剤添加混練後のスラリー粘度を１５００ポイズと
したが、この粘度を３００ポイズ未満に設定すると、不
必要に、溶剤量を増大させなければならない他に混練時
間が長くなりすぎ、また、６０００００ポイズより大き
いと粉体の部分的な凝集が発生しても解消できず最終的
に均一な混合が困難になる。したがって、混合粉体に対
する最初の溶剤添加混練後のスラリー粘度は、３００〜
６０００００ポイズが望ましい。In this embodiment, the slurry viscosity after the first solvent addition and kneading to the mixed powder was 1500 poise, but if this viscosity is set to less than 300 poise, the amount of solvent must be increased unnecessarily. In addition to the above, the kneading time becomes too long, and if it is larger than 600,000 poise, even if partial agglomeration of the powder occurs, it cannot be solved and finally uniform mixing becomes difficult. Therefore, the slurry viscosity after the first solvent addition and kneading to the mixed powder is 300 to
600,000 poise is desirable.
【００１８】また、混合粉体に対する最終的なスラリー
粘度を２８ポイズとしたが、得られたスラリーを電極シ
ートの芯材に塗布する場合に、２０ポイズ未満ではスラ
リーとして軟らかすぎ、あるいは７０ポイズより大きい
と固すぎて、いずれにしても芯材への塗布性が悪くな
る。したがって、最終的なスラリー粘度は２０〜７０ポ
イズが望ましい。The final slurry viscosity for the mixed powder is 28 poise. When the obtained slurry is applied to the core material of the electrode sheet, the slurry is too soft as 20 poise or more than 70 poise. If it is too large, it will be too hard, and in any case, the coatability on the core material will deteriorate. Therefore, the final slurry viscosity is preferably 20 to 70 poise.
【００１９】さらにまた、混合粉体に加える溶剤の全量
は、正極スラリー及び負極スラリーではそれぞれ混合粉
体に対して６０重量％及び１４０重量％となるが、正極
スラリーではこれが４０重量％未満の場合、溶剤量が少
なすぎて粉体の粘度が高くなりすぎるため粉体の部分的
な凝集が発生して粉体の均一な混合が困難になり、ま
た、７０重量％より大きい場合は、スラリーとして軟ら
かすぎて芯材への塗布性が悪くなるとともに溶剤量が多
すぎて乾燥工程での乾燥時間が長くなる。したがって、
正極スラリー用混合粉体に加える溶剤の全量は加える混
合粉体の４０〜７０重量％が望ましい。同様に負極スラ
リー用混合粉体に加える溶剤の全量は加える混合粉体の
９０〜１８０重量％が望ましい。Furthermore, the total amount of the solvent added to the mixed powder is 60% by weight and 140% by weight with respect to the mixed powder in the positive electrode slurry and the negative electrode slurry, respectively, but when this is less than 40% by weight in the positive electrode slurry. If the amount of the solvent is too small and the viscosity of the powder becomes too high, the powder partially aggregates, which makes it difficult to uniformly mix the powder, and when it is more than 70% by weight, it becomes a slurry. If it is too soft, the coatability on the core material will be poor, and the amount of solvent will be too large, and the drying time in the drying step will be long. Therefore,
The total amount of the solvent added to the mixed powder for the positive electrode slurry is preferably 40 to 70% by weight of the mixed powder to be added. Similarly, the total amount of the solvent added to the mixed powder for negative electrode slurry is preferably 90 to 180% by weight of the mixed powder to be added.
【００２０】なお、混合粉体に最初に加える溶剤量を、
正極スラリーでは加える溶剤の全量の約３３重量％、負
極スラリーでは加える溶剤の全量の約５０重量％とした
が、２０重量％未満では溶剤量が少なすぎて粉体の粘度
が高くなりすぎるため粉体の部分的な凝集が発生して粉
体の均一な混合が困難になり、また、７０重量％より大
きい場合も溶剤量が多くなり粘度が低くなりすぎて粉体
同士のズリ効果が生じないため、やはり部分的な凝集が
発生しても解消できずに粉体の均一な混合が困難にな
る。したがって、混合粉体に加える最初の溶剤量は加え
る溶剤の全量の２０〜７０重量％が望ましい。The amount of solvent initially added to the mixed powder is
About 33% by weight of the total amount of the solvent added in the positive electrode slurry and about 50% by weight of the total amount of the solvent added in the negative electrode slurry, but if it is less than 20% by weight, the amount of the solvent is too small and the viscosity of the powder becomes too high. Partial agglomeration of the body occurs and it becomes difficult to uniformly mix the powders. Also, when the content is more than 70% by weight, the amount of the solvent increases and the viscosity becomes too low so that the sliding effect between the powders does not occur. Therefore, even if partial agglomeration occurs, it cannot be eliminated and it becomes difficult to uniformly mix the powder. Therefore, the initial amount of solvent added to the mixed powder is preferably 20 to 70% by weight of the total amount of solvent added.
【００２１】また、混合粉体への最初の溶剤添加時の混
練時間を６０分間としたが、各種粉体及び溶剤の量や混
練方法を工夫することによりこの混練時間を短縮するこ
とも可能であるが、いずれにせよ１０分間未満では粉体
の均一な混合が困難となる。したがって、混合粉体への
最初の溶剤添加時の混練時間は１０分間以上が望まし
い。Further, the kneading time at the time of first adding the solvent to the mixed powder was set to 60 minutes, but the kneading time can be shortened by devising the amounts of the various powders and the solvent and the kneading method. However, in any case, if it is less than 10 minutes, it becomes difficult to uniformly mix the powder. Therefore, the kneading time at the time of first adding the solvent to the mixed powder is preferably 10 minutes or more.
【００２２】なお、本発明における粘度は、回転式粘度
計を用い、ズリ速度Ｄ＝５０（Ｓ-1）で測定されたもの
である。The viscosity in the present invention is measured at a shear rate D = 50 (S -1 ) using a rotary viscometer.
【００２３】[0023]
【発明の効果】電極活物質、導電材、結着剤及び溶剤を
混練する際に前記溶剤の量を調整してこの混練物の粘度
を３００〜６０００００ポイズに調整すると、前記電極
活物質、前記導電材、前記結着剤は部分的に凝集するこ
となく前記溶剤に均一に分散混合されるので、その後さ
らに所定の粘度になるために加える溶剤は、少量で済
む。したがって、従来の製造方法に比べて必要な溶剤は
少量で済むため、得られた電極スラリーを電極シートの
芯材に塗布した場合には乾燥工程でのスラリーの乾燥時
間を短縮でき、以て生産性を向上できる。また、混練物
は均一に分散混合されるので均一な粘度のスラリーを得
ることができる。したがって、得られた電極スラリーを
電極シートの芯材に塗布した場合には、均一な塗布状態
を実現でき、以て品質を向上できる。When the electrode active material, the conductive material, the binder and the solvent are kneaded, the amount of the solvent is adjusted to adjust the viscosity of the kneaded product to 300 to 600,000 poises. Since the conductive material and the binder are uniformly dispersed and mixed in the solvent without partially agglomerating, a small amount of solvent may be added in order to obtain a predetermined viscosity thereafter. Therefore, a small amount of solvent is required as compared with the conventional manufacturing method, and thus when the obtained electrode slurry is applied to the core material of the electrode sheet, the drying time of the slurry in the drying step can be shortened, and thus the production You can improve the property. Moreover, since the kneaded product is uniformly dispersed and mixed, a slurry having a uniform viscosity can be obtained. Therefore, when the obtained electrode slurry is applied to the core material of the electrode sheet, a uniform application state can be realized and thus the quality can be improved.
【図１】本発明に係る正極シートと従来の正極シートと
のスラリー塗布後重量の経時変化を比較して示すグラフ
である。FIG. 1 is a graph showing changes in weight of a positive electrode sheet according to the present invention and a conventional positive electrode sheet with time after a slurry is applied for comparison.
【図２】本発明に係る溶剤量に対する正極スラリーの粘
度変化と従来の溶剤量に対する正極スラリーの粘度変化
を比較して示すグラフである。FIG. 2 is a graph showing a change in the viscosity of the positive electrode slurry with respect to the amount of solvent according to the present invention and a change in the viscosity of the positive electrode slurry with respect to the conventional amount of solvent.
【図３】本発明に係る負極シートと従来の負極シートと
のスラリー塗布後重量の経時変化を比較して示すグラフ
である。FIG. 3 is a graph showing changes in weight of a negative electrode sheet according to the present invention and a conventional negative electrode sheet after slurry coating, for comparison.
【図４】本発明に係る溶剤量に対する負極スラリーの粘
度変化と従来の溶剤量に対する負極スラリーの粘度変化
を比較して示すグラフである。FIG. 4 is a graph showing a change in viscosity of a negative electrode slurry with respect to an amount of a solvent according to the present invention and a change in viscosity of a negative electrode slurry with respect to a conventional amount of a solvent.
Claims (2)
混練してなるリチウム電池用電極スラリーの製造方法に
おいて、該電極活物質、該導電材、該結着剤及び該溶剤
を混練する際に該溶剤の量を調整してこの混練物の粘度
を３００〜６０００００ポイズに調整し、その後さらに
溶剤を加えて該混練物を所定の粘度になるまで混練する
ことを特徴とするリチウム電池用電極スラリーの製造方
法。1. A method for producing an electrode slurry for a lithium battery, which comprises kneading an electrode active material, a conductive material, a binder and a solvent, and kneading the electrode active material, the conductive material, the binder and the solvent. A lithium battery characterized by adjusting the amount of the solvent to adjust the viscosity of the kneaded product to 300 to 600,000 poise, and then adding a solvent to knead the kneaded product until a predetermined viscosity is reached. Of manufacturing electrode slurry for automobile.
０ポイズに調整する際に加える溶剤量を前記混練物に加
える溶剤の全量の２０〜７０重量％にするとともに、そ
の後さらに溶剤を加えて混練した後の前記所定の粘度を
２０〜７０ポイズにすることを特徴とする請求項１に記
載のリチウム電池用電極スラリーの製造方法。2. The kneaded product has a viscosity of 300 to 60,000.
The amount of the solvent added when adjusting to 0 poise is 20 to 70% by weight of the total amount of the solvent added to the kneaded product, and then the predetermined viscosity after kneading is further added with the solvent to 20 to 70 poise. The method for producing a lithium battery electrode slurry according to claim 1, wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5307744A JP2750077B2 (en) | 1993-12-08 | 1993-12-08 | Method for producing electrode slurry for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5307744A JP2750077B2 (en) | 1993-12-08 | 1993-12-08 | Method for producing electrode slurry for lithium battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07161350A true JPH07161350A (en) | 1995-06-23 |
| JP2750077B2 JP2750077B2 (en) | 1998-05-13 |
Family
ID=17972749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5307744A Expired - Fee Related JP2750077B2 (en) | 1993-12-08 | 1993-12-08 | Method for producing electrode slurry for lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2750077B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0822606A1 (en) * | 1996-08-02 | 1998-02-04 | Saft | Composition for positive electrode, process of preparation and the use of an organic to neutralise LiOH |
| JPH10208728A (en) * | 1997-01-21 | 1998-08-07 | Nippon Chem Ind Co Ltd | Positive electrode composition for lithium secondary battery and lithium secondary battery |
| WO1998038029A1 (en) * | 1997-02-25 | 1998-09-03 | Elf Atochem S.A. | A thermoplastic fluororesin porous body, a method for the production thereof and use of said porous body for producing a battery cell |
| JP2001167756A (en) * | 1999-12-07 | 2001-06-22 | Sanyo Electronic Components Co Ltd | Method of fabricating non-aqueous electrolyte secondary battery |
| KR100373722B1 (en) * | 1995-11-17 | 2003-04-23 | 삼성에스디아이 주식회사 | Process for producing lithium cathode |
| US7662516B2 (en) | 2004-06-07 | 2010-02-16 | Panasonic Corporation | Electrode plate of positive electrode for non-aqueous electrolyte secondary battery and manufacturing method thereof |
| CN102683644A (en) * | 2012-05-23 | 2012-09-19 | 东莞新能源科技有限公司 | Preparation method of anode slurry of lithium ion battery |
| JP2013073749A (en) * | 2011-09-27 | 2013-04-22 | Toyota Motor Corp | Manufacturing method of electrode for power storage device |
| CN111063892A (en) * | 2019-12-24 | 2020-04-24 | 横店集团东磁股份有限公司 | Lithium ion battery cathode slurry and preparation method and application thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5222313B2 (en) | 2010-02-09 | 2013-06-26 | 三菱重工業株式会社 | Electrode material manufacturing equipment |
-
1993
- 1993-12-08 JP JP5307744A patent/JP2750077B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100373722B1 (en) * | 1995-11-17 | 2003-04-23 | 삼성에스디아이 주식회사 | Process for producing lithium cathode |
| EP0822606A1 (en) * | 1996-08-02 | 1998-02-04 | Saft | Composition for positive electrode, process of preparation and the use of an organic to neutralise LiOH |
| JPH10208728A (en) * | 1997-01-21 | 1998-08-07 | Nippon Chem Ind Co Ltd | Positive electrode composition for lithium secondary battery and lithium secondary battery |
| WO1998038029A1 (en) * | 1997-02-25 | 1998-09-03 | Elf Atochem S.A. | A thermoplastic fluororesin porous body, a method for the production thereof and use of said porous body for producing a battery cell |
| JP2001167756A (en) * | 1999-12-07 | 2001-06-22 | Sanyo Electronic Components Co Ltd | Method of fabricating non-aqueous electrolyte secondary battery |
| US7662516B2 (en) | 2004-06-07 | 2010-02-16 | Panasonic Corporation | Electrode plate of positive electrode for non-aqueous electrolyte secondary battery and manufacturing method thereof |
| JP2013073749A (en) * | 2011-09-27 | 2013-04-22 | Toyota Motor Corp | Manufacturing method of electrode for power storage device |
| CN102683644A (en) * | 2012-05-23 | 2012-09-19 | 东莞新能源科技有限公司 | Preparation method of anode slurry of lithium ion battery |
| CN102683644B (en) * | 2012-05-23 | 2014-11-12 | 东莞新能源科技有限公司 | Preparation method of anode slurry of lithium ion battery |
| CN111063892A (en) * | 2019-12-24 | 2020-04-24 | 横店集团东磁股份有限公司 | Lithium ion battery cathode slurry and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2750077B2 (en) | 1998-05-13 |
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