JP6380083B2 - Electrode body and method for producing positive electrode - Google Patents

Electrode body and method for producing positive electrode Download PDF

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JP6380083B2
JP6380083B2 JP2014257057A JP2014257057A JP6380083B2 JP 6380083 B2 JP6380083 B2 JP 6380083B2 JP 2014257057 A JP2014257057 A JP 2014257057A JP 2014257057 A JP2014257057 A JP 2014257057A JP 6380083 B2 JP6380083 B2 JP 6380083B2
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positive electrode
current collector
region
insulating layer
negative electrode
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JP2016119183A (en
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将一 梅原
将一 梅原
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Toyota Motor Corp
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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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Description

本発明は電極体および正極の製造方法に関し、特に非水電解質二次電池に用いられる電極体および正極の製造方法に関する。   The present invention relates to an electrode body and a method for producing a positive electrode, and more particularly to an electrode body used for a nonaqueous electrolyte secondary battery and a method for producing a positive electrode.

非水電解質二次電池の一つにリチウムイオン二次電池がある。リチウムイオン二次電池は、リチウムイオンを吸蔵・放出する正極および負極の間を、電解質中のリチウムイオンが移動することで充放電可能な二次電池である。   One of the non-aqueous electrolyte secondary batteries is a lithium ion secondary battery. A lithium ion secondary battery is a secondary battery that can be charged and discharged by moving lithium ions in an electrolyte between a positive electrode and a negative electrode that occlude and release lithium ions.

特許文献１には、電極活物質の上に絶縁層を塗布して形成した電極板を用いた非水電解質二次電池に関する技術が開示されている。特許文献１にかかる非水電解質二次電池では、通常のシート状のセパレータは使用せずに絶縁層をセパレータとして使用している。特許文献１に開示されている技術では、正極集電体上に正極合剤層が形成されていない正極合剤層未形成部にも絶縁層が形成されており、絶縁層を形成する絶縁性粒子として樹脂粒子が用いられている。   Patent Document 1 discloses a technique related to a non-aqueous electrolyte secondary battery using an electrode plate formed by applying an insulating layer on an electrode active material. In the non-aqueous electrolyte secondary battery according to Patent Document 1, an insulating layer is used as a separator without using a normal sheet-like separator. In the technique disclosed in Patent Document 1, the insulating layer is formed on the positive electrode mixture layer-unformed portion where the positive electrode mixture layer is not formed on the positive electrode current collector. Resin particles are used as the particles.

特開２０１１−２４３３５１号公報JP 2011-243351 A

特許文献１に開示されている非水電解質二次電池のように、電極体の絶縁層に樹脂粒子を用いた場合は、樹脂粒子同士の接着強度が弱いために、シート状のセパレータを用いた場合よりも絶縁層の強度が弱くなる。このため、絶縁層を介して正極および負極を積層した際、電極を切断したときに生じたバリが絶縁層を突き破り、正極と負極とが短絡してしまうおそれがある。   When resin particles are used for the insulating layer of the electrode body as in the non-aqueous electrolyte secondary battery disclosed in Patent Document 1, a sheet-like separator is used because the adhesive strength between the resin particles is weak. The strength of the insulating layer is weaker than in the case. For this reason, when the positive electrode and the negative electrode are laminated through the insulating layer, the burr generated when the electrode is cut may break through the insulating layer, causing a short circuit between the positive electrode and the negative electrode.

図１６は、本発明の課題を説明するための図であり、電極体を捲回する前の正極（以下、正極シートとも記載する）と負極（以下、負極シートとも記載する）の状態を示す上面図である。図１７は、図１６に示す電極体の切断線ＸＶＩＩ−ＸＶＩＩにおける断面図である。図１６に示すように、電極体１０１は、帯状の正極シート１１０と帯状の負極シート１２０とを備える。正極シート１１０および負極シート１２０は厚さ方向において積層されている。   FIG. 16 is a diagram for explaining the problem of the present invention and shows a state of a positive electrode (hereinafter also referred to as a positive electrode sheet) and a negative electrode (hereinafter also referred to as a negative electrode sheet) before winding the electrode body. It is a top view. 17 is a cross-sectional view of the electrode body shown in FIG. 16 taken along section line XVII-XVII. As shown in FIG. 16, the electrode body 101 includes a strip-shaped positive electrode sheet 110 and a strip-shaped negative electrode sheet 120. The positive electrode sheet 110 and the negative electrode sheet 120 are laminated in the thickness direction.

図１６、図１７に示すように、正極シート１１０は、正極集電体１１１と、当該正極集電体上（つまり、正極集電体１１１の両面）に形成された正極合剤層１１２と、当該正極合剤層１２２上に形成された樹脂粒子を含む絶縁層１１３と、を備える。図１７に示すように、絶縁層１１３は正極合剤層１１２の端部１１９を覆うように形成されており、絶縁層１１３の一部（符号１１５で示す）は正極集電体１１１上に形成されている。正極シート１１０の幅方向の一端（つまり、図１６に示す正極シート１１０の上側）には、正極集電体１１１が露出している露出部１１４（つまり、正極合剤層１１２及び絶縁層１１３、１１５が形成されていない部分）が設けられている。   As shown in FIGS. 16 and 17, the positive electrode sheet 110 includes a positive electrode current collector 111 and a positive electrode mixture layer 112 formed on the positive electrode current collector (that is, both surfaces of the positive electrode current collector 111). And an insulating layer 113 including resin particles formed on the positive electrode mixture layer 122. As shown in FIG. 17, the insulating layer 113 is formed so as to cover the end portion 119 of the positive electrode mixture layer 112, and a part of the insulating layer 113 (indicated by reference numeral 115) is formed on the positive electrode current collector 111. Has been. At one end in the width direction of the positive electrode sheet 110 (that is, the upper side of the positive electrode sheet 110 shown in FIG. 16), an exposed portion 114 (that is, the positive electrode mixture layer 112 and the insulating layer 113) where the positive electrode current collector 111 is exposed. 115) is provided.

また、負極シート１２０は、負極集電体１２１と、当該負極集電体上（つまり、負極集電体１２１の両面）に形成された負極合剤層１２２と、を備える。負極シート１２０の幅方向の一端（つまり、図１６に示す負極シート１２０の下側）には、負極集電体１２１が露出している露出部１２４（つまり、負極合剤層１２２が形成されていない部分）が設けられている。   The negative electrode sheet 120 includes a negative electrode current collector 121 and a negative electrode mixture layer 122 formed on the negative electrode current collector (that is, both surfaces of the negative electrode current collector 121). At one end in the width direction of the negative electrode sheet 120 (that is, the lower side of the negative electrode sheet 120 shown in FIG. 16), an exposed portion 124 (that is, the negative electrode mixture layer 122) from which the negative electrode current collector 121 is exposed is formed. No part) is provided.

図１７に示すように、正極シート１１０および負極シート１２０は、正極集電体１１１の露出部１１４と負極集電体１２１の露出部１２４とが幅方向において互いに反対側になるように配置されている。また、負極１２０の幅方向の端部１２５は、積層方向から平面視した際に、絶縁層１１５と重畳するように配置されている。   As shown in FIG. 17, the positive electrode sheet 110 and the negative electrode sheet 120 are arranged such that the exposed portion 114 of the positive electrode current collector 111 and the exposed portion 124 of the negative electrode current collector 121 are opposite to each other in the width direction. Yes. Further, the end portion 125 in the width direction of the negative electrode 120 is disposed so as to overlap with the insulating layer 115 when viewed in plan from the stacking direction.

ここで、図１７に示す負極シート１２０の幅方向の端部１２５は負極集電体１２１を切断した部分であるためバリ１３０（金属である負極集電体の破片）が生じる場合がある。また、電極体１０１の絶縁層１１３、１１５に樹脂粒子を用いた場合は、樹脂粒子同士の接着強度が弱いために絶縁層１１３、１１５の強度が弱くなる。このため、電極体１０１を捲回した際に、負極シート１２０のバリ１３０が正極集電体１１１上の絶縁層１１５を突き破り、正極と負極とが短絡してしまうおそれがある。   Here, since the end portion 125 in the width direction of the negative electrode sheet 120 shown in FIG. 17 is a portion obtained by cutting the negative electrode current collector 121, a burr 130 (a fragment of the negative electrode current collector that is a metal) may occur. Further, when resin particles are used for the insulating layers 113 and 115 of the electrode body 101, the strength of the insulating layers 113 and 115 becomes weak because the adhesive strength between the resin particles is weak. For this reason, when the electrode body 101 is wound, the burr 130 of the negative electrode sheet 120 may break through the insulating layer 115 on the positive electrode current collector 111 and the positive electrode and the negative electrode may be short-circuited.

上記課題に鑑み本発明の目的は、絶縁層に樹脂粒子を用いた場合であっても、正極と負極との短絡を抑制することが可能な電極体および正極の製造方法を提供することである。   In view of the above problems, an object of the present invention is to provide an electrode body capable of suppressing a short circuit between a positive electrode and a negative electrode and a method for manufacturing the positive electrode even when resin particles are used for the insulating layer. .

本発明にかかる電極体は、正極と負極とが積層された非水電解質二次電池用の電極体であって、前記正極は、正極集電体と、当該正極集電体上の第１の領域に形成された正極合剤層と、前記正極集電体上の前記第１の領域と幅方向において隣り合う第２の領域および前記正極合剤層上に当該正極合剤層を覆うように形成された樹脂粒子を含む絶縁層と、を備えると共に、前記正極集電体の前記第２の領域を基準として前記第１の領域と反対側の第３の領域に前記正極合剤層および前記絶縁層が形成されておらず前記正極集電体が露出している露出部を備え、前記負極は、負極集電体と、当該負極集電体上に形成された負極合剤層と、を備えると共に、前記負極の幅方向の一方の端部側において前記負極合剤層が形成されておらず前記負極集電体が露出している露出部を備え、前記正極および前記負極は、前記正極集電体の露出部と前記負極集電体の露出部とが幅方向において互いに反対側になるように、且つ、前記正極および前記負極の積層方向から平面視した際に、前記負極の幅方向の他方の端部が前記正極集電体上の前記第２の領域に形成されている前記絶縁層と重畳するように配置されており、前記正極集電体上の前記第２の領域に形成されている前記絶縁層の樹脂粒子同士が熱溶着していることを特徴とする。   An electrode body according to the present invention is an electrode body for a non-aqueous electrolyte secondary battery in which a positive electrode and a negative electrode are laminated, and the positive electrode includes a positive electrode current collector and a first electrode on the positive electrode current collector. A positive electrode mixture layer formed in a region, a second region adjacent to the first region on the positive electrode current collector in the width direction, and the positive electrode mixture layer so as to cover the positive electrode mixture layer An insulating layer including the formed resin particles, and the positive electrode mixture layer and the third region on the side opposite to the first region with respect to the second region of the positive electrode current collector The negative electrode has a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector. The negative electrode mixture layer is not formed on one end side in the width direction of the negative electrode, and the negative electrode current collector The positive electrode and the negative electrode are arranged such that the exposed portion of the positive electrode current collector and the exposed portion of the negative electrode current collector are opposite to each other in the width direction, and When viewed in plan from the stacking direction of the positive electrode and the negative electrode, the other end in the width direction of the negative electrode overlaps with the insulating layer formed in the second region on the positive electrode current collector It is arrange | positioned and the resin particles of the said insulating layer currently formed in the said 2nd area | region on the said positive electrode electrical power collector are heat-welded, It is characterized by the above-mentioned.

本発明にかかる電極体では、正極集電体上の第２の領域に形成されている絶縁層の樹脂粒子同士を熱溶着して、当該絶縁層の強度を高めている。よって、負極の幅方向の他方の端部が、正極集電体上の第２の領域に形成されている絶縁層と重畳するように配置された場合であっても、負極の端部に発生したバリが絶縁層を突き破り、正極と負極とが短絡してしまうことを抑制することができる。   In the electrode body according to the present invention, the resin particles of the insulating layer formed in the second region on the positive electrode current collector are thermally welded to increase the strength of the insulating layer. Therefore, even if the other end in the width direction of the negative electrode is disposed so as to overlap with the insulating layer formed in the second region on the positive electrode current collector, the negative electrode is generated at the end of the negative electrode. It is possible to prevent the burr from breaking through the insulating layer and short-circuiting the positive electrode and the negative electrode.

本発明にかかる正極の製造方法は、長手方向に伸びる第１乃至第３の領域が幅方向において並んでいる帯状の正極集電体上の前記第１の領域に正極合剤層を形成する工程と、前記正極集電体上の前記第３の領域を露出させつつ、前記正極集電体上の前記第１の領域と前記第３の領域とに挟まれた前記第２の領域および前記正極合剤層上に当該正極合剤層を覆うように樹脂粒子を塗布して絶縁層を形成する工程と、前記絶縁層を形成した後の正極を加熱して、前記正極集電体上の前記第２の領域に形成されている前記絶縁層の樹脂粒子同士を選択的に熱溶着する工程と、を備える。   The method for producing a positive electrode according to the present invention includes a step of forming a positive electrode mixture layer in the first region on a strip-shaped positive electrode current collector in which first to third regions extending in the longitudinal direction are arranged in the width direction. And the second region and the positive electrode sandwiched between the first region and the third region on the positive electrode current collector while exposing the third region on the positive electrode current collector A step of forming an insulating layer by applying resin particles so as to cover the positive electrode mixture layer on the mixture layer; and heating the positive electrode after forming the insulating layer, And a step of selectively thermally welding the resin particles of the insulating layer formed in the second region.

本発明にかかる正極の製造方法では、正極集電体上の第２の領域および正極合剤層上に樹脂粒子を塗布して絶縁層を形成した後、当該絶縁層を形成した後の正極を加熱している。ここで、正極集電体の第１の領域には、熱容量の大きい正極合剤層が形成されているので、正極合剤層上に形成された絶縁層は加熱されにくい。一方、正極集電体上の第２の領域には直接絶縁層が形成されているので、正極集電体上の第２の領域に形成されている絶縁層は加熱されやすい。よって、正極集電体上の第２の領域に形成されている絶縁層を選択的に熱溶着することができる。また、正極集電体上の第２の領域に形成されている絶縁層を熱溶着して当該絶縁層の強度を高めているので、本発明にかかる正極を用いて電極体を形成した際、電極体の正極と負極とが短絡してしまうことを抑制することができる。   In the method for producing a positive electrode according to the present invention, after forming an insulating layer by applying resin particles on the second region and the positive electrode mixture layer on the positive electrode current collector, the positive electrode after forming the insulating layer is formed. Heating. Here, since the positive electrode mixture layer having a large heat capacity is formed in the first region of the positive electrode current collector, the insulating layer formed on the positive electrode mixture layer is hardly heated. On the other hand, since the insulating layer is directly formed in the second region on the positive electrode current collector, the insulating layer formed in the second region on the positive electrode current collector is easily heated. Therefore, the insulating layer formed in the second region on the positive electrode current collector can be selectively heat-welded. In addition, since the strength of the insulating layer is increased by thermally welding the insulating layer formed in the second region on the positive electrode current collector, when the electrode body is formed using the positive electrode according to the present invention, It can suppress that the positive electrode and negative electrode of an electrode body short-circuit.

本発明により、絶縁層に樹脂粒子を用いた場合であっても、正極と負極との短絡を抑制することが可能な電極体および正極の製造方法を提供することができる。   According to the present invention, even when resin particles are used for the insulating layer, an electrode body capable of suppressing a short circuit between the positive electrode and the negative electrode and a method for manufacturing the positive electrode can be provided.

実施の形態にかかる電極体を説明するための上面図である。It is a top view for demonstrating the electrode body concerning embodiment. 図１に示す電極体の切断線ＩＩ−ＩＩにおける断面図である。It is sectional drawing in the cutting line II-II of the electrode body shown in FIG. 実施の形態にかかる電極体を捲回している状態を示す斜視図である。It is a perspective view which shows the state which is winding the electrode body concerning embodiment. 実施の形態にかかる電極体の一例を示す断面図である。It is sectional drawing which shows an example of the electrode body concerning embodiment. 実施の形態にかかる電極体の他の構成例を示す断面図である。It is sectional drawing which shows the other structural example of the electrode body concerning embodiment. 実施の形態にかかる電極体の他の構成例を示す断面図である。It is sectional drawing which shows the other structural example of the electrode body concerning embodiment. 実施の形態にかかる電極体の他の構成例を示す断面図である。It is sectional drawing which shows the other structural example of the electrode body concerning embodiment. 実施の形態にかかる正極の製造方法を説明するためのフローチャートである。It is a flowchart for demonstrating the manufacturing method of the positive electrode concerning embodiment. 実施の形態にかかる正極の製造方法を説明するための断面図である。It is sectional drawing for demonstrating the manufacturing method of the positive electrode concerning embodiment. 実施の形態にかかる正極の製造方法を説明するための断面図である。It is sectional drawing for demonstrating the manufacturing method of the positive electrode concerning embodiment. グラビア塗工装置を用いて樹脂粒子を塗工する工程を説明するための図である。It is a figure for demonstrating the process of applying a resin particle using a gravure coating apparatus. グラビア塗工装置を用いて樹脂粒子を塗工する工程を説明するための図である。It is a figure for demonstrating the process of applying a resin particle using a gravure coating apparatus. 実施の形態にかかる正極の製造方法を説明するための上面図である。It is a top view for demonstrating the manufacturing method of the positive electrode concerning embodiment. 実施の形態にかかる正極の製造方法を説明するための断面図である。It is sectional drawing for demonstrating the manufacturing method of the positive electrode concerning embodiment. 絶縁層の熱溶着の有無と電極体の短絡の有無との関係を示す表である。It is a table | surface which shows the relationship between the presence or absence of the thermal welding of an insulating layer, and the presence or absence of a short circuit of an electrode body. 本発明の課題を説明するための上面図である。It is a top view for demonstrating the subject of this invention. 図１６に示す電極体の切断線ＸＶＩＩ−ＸＶＩＩにおける断面図である。It is sectional drawing in the cutting | disconnection line XVII-XVII of the electrode body shown in FIG.

以下、図面を参照して本発明の実施の形態について説明する。
図１は、本実施の形態にかかる電極体１を説明するための上面図である。図１は、電極体１を捲回する前の正極（正極シート）１０と負極（負極シート）２０の状態を示す上面図である。図２は、図１に示す電極体１の切断線ＩＩ−ＩＩにおける断面図である。図１に示すように、電極体１は、帯状の正極シート１０と帯状の負極シート２０とを備える。正極シート１０および負極シート２０は厚さ方向において積層されている。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a top view for explaining an electrode body 1 according to the present embodiment. FIG. 1 is a top view showing a state of the positive electrode (positive electrode sheet) 10 and the negative electrode (negative electrode sheet) 20 before winding the electrode body 1. 2 is a cross-sectional view of the electrode body 1 shown in FIG. 1 taken along a cutting line II-II. As shown in FIG. 1, the electrode body 1 includes a strip-shaped positive electrode sheet 10 and a strip-shaped negative electrode sheet 20. The positive electrode sheet 10 and the negative electrode sheet 20 are laminated in the thickness direction.

図１、図２に示すように、正極シート１０は、正極集電体１１、正極合剤層１２（図２参照）、及び絶縁層１３、１５を備える。正極合剤層１２は、正極集電体１１上の第１の領域３１の両面に形成されている。絶縁層１３、１５は、正極合剤層１２上（第１の領域３１）および正極集電体１１上の第２の領域３２に、正極合剤層１２を覆うように形成されている。ここで、第２の領域３２は、第１の領域３１と幅方向において隣り合う領域である。また、絶縁層１３、１５は樹脂粒子を用いて構成されており、絶縁層１５を構成している樹脂粒子同士は互いに熱溶着している。正極集電体１１の第３の領域３３（つまり、第２の領域３２を基準として第１の領域３１と反対側の領域）は、正極集電体１１が露出している（以下、露出部３３とも記載する）。換言すると、正極集電体１１の露出部３３は、正極合剤層１２および絶縁層１３、１５が形成（塗工）されていない部分である。また、図１に示すように、第１乃至第３の領域３１〜３３は、帯状の正極シート１０の長手方向に伸びるように配置されている。   As shown in FIGS. 1 and 2, the positive electrode sheet 10 includes a positive electrode current collector 11, a positive electrode mixture layer 12 (see FIG. 2), and insulating layers 13 and 15. The positive electrode mixture layer 12 is formed on both surfaces of the first region 31 on the positive electrode current collector 11. The insulating layers 13 and 15 are formed on the positive electrode mixture layer 12 (first region 31) and the second region 32 on the positive electrode current collector 11 so as to cover the positive electrode mixture layer 12. Here, the second region 32 is a region adjacent to the first region 31 in the width direction. Moreover, the insulating layers 13 and 15 are comprised using the resin particle, and the resin particles which comprise the insulating layer 15 are heat-welded mutually. The positive electrode current collector 11 is exposed in the third region 33 of the positive electrode current collector 11 (that is, the region opposite to the first region 31 with respect to the second region 32) (hereinafter, an exposed portion). 33). In other words, the exposed portion 33 of the positive electrode current collector 11 is a portion where the positive electrode mixture layer 12 and the insulating layers 13 and 15 are not formed (coated). Further, as shown in FIG. 1, the first to third regions 31 to 33 are arranged so as to extend in the longitudinal direction of the belt-like positive electrode sheet 10.

正極集電体１１には、例えばアルミニウムまたはアルミニウムを主成分とする合金を用いることができる。正極合剤層１２は、正極活物質を含む。正極活物質は、リチウムを吸蔵・放出可能な材料であり、例えばコバルト酸リチウム（ＬｉＣｏＯ２）、マンガン酸リチウム（ＬｉＭｎ２Ｏ４）、ニッケル酸リチウム（ＬｉＮｉＯ２）等を用いることができる。また、ＬｉＣｏＯ２、ＬｉＭｎ２Ｏ４、ＬｉＮｉＯ２を任意の割合で混合して焼成した材料を用いてもよい。また、正極合剤層１２は、導電材を含んでいてもよい。導電材としては、例えばアセチレンブラック（ＡＢ）、ケッチェンブラック等のカーボンブラック、黒鉛（グラファイト）を用いることができる。また、絶縁層１３、１５を構成する樹脂粒子には、例えばポリエチレン粒子等の熱可塑性の樹脂粒子を用いることができる。絶縁層１３、１５は、正極シート１０と負極シート２０とを積層した際に、正極シート１０と負極シート２０とが短絡することを防止するセパレータとして機能する。 For the positive electrode current collector 11, for example, aluminum or an alloy containing aluminum as a main component can be used. The positive electrode mixture layer 12 includes a positive electrode active material. The positive electrode active material is a material capable of inserting and extracting lithium. For example, lithium cobaltate (LiCoO 2 ), lithium manganate (LiMn 2 O 4 ), lithium nickelate (LiNiO 2 ), and the like can be used. Moreover, LiCoO 2, LiMn 2 O 4 , LiNiO 2 and may be a material obtained by firing mixed at an arbitrary ratio. Moreover, the positive mix layer 12 may contain the electrically conductive material. As the conductive material, for example, carbon black such as acetylene black (AB) and ketjen black, and graphite (graphite) can be used. Further, thermoplastic resin particles such as polyethylene particles can be used as the resin particles constituting the insulating layers 13 and 15. The insulating layers 13 and 15 function as a separator that prevents the positive electrode sheet 10 and the negative electrode sheet 20 from being short-circuited when the positive electrode sheet 10 and the negative electrode sheet 20 are laminated.

図１、図２に示すように、負極シート２０は、負極集電体２１と、当該負極集電体２１上（つまり、負極集電体２１の両面）に配置された負極合剤層２２と、を備える。負極シート２０の幅方向の一端（つまり、図１に示す負極シート２０の下側）には、負極集電体２１が露出している露出部２４（つまり、負極合剤層２２が配置（塗工）されていない部分）が設けられている。   As shown in FIGS. 1 and 2, the negative electrode sheet 20 includes a negative electrode current collector 21, and a negative electrode mixture layer 22 disposed on the negative electrode current collector 21 (that is, both surfaces of the negative electrode current collector 21). . At one end in the width direction of the negative electrode sheet 20 (that is, the lower side of the negative electrode sheet 20 shown in FIG. 1), an exposed portion 24 (that is, the negative electrode mixture layer 22) where the negative electrode current collector 21 is exposed is disposed (coated). The part which is not worked) is provided.

負極集電体２１には、例えば銅やニッケルあるいはそれらの合金を用いることができる。負極合剤層２２は負極活物質を含む。負極活物質は、リチウムを吸蔵・放出可能な材料であり、例えば、黒鉛（グラファイト）等からなる粉末状の炭素材料を用いることができる。   For the negative electrode current collector 21, for example, copper, nickel, or an alloy thereof can be used. The negative electrode mixture layer 22 includes a negative electrode active material. The negative electrode active material is a material capable of inserting and extracting lithium, and for example, a powdery carbon material made of graphite or the like can be used.

図２に示すように、正極シート１０および負極シート２０は、正極集電体１１の露出部３３と負極集電体２１の露出部２４とが幅方向において互いに反対側になるように配置されている。また、負極合剤層２２の幅は正極合剤層１２の幅よりも広い。このため、負極シート２０の幅方向の端部２５は、正極シート１０および負極シート２０の積層方向から平面視した際に、絶縁層１５（正極集電体１１上の第２の領域３２）と重畳するように配置される。換言すると、正極集電体１１上の第２の領域３２に配置されている絶縁層１５と負極シート２０の幅方向の端部２５とが積層方向において互いに対向するように配置されている。   As shown in FIG. 2, the positive electrode sheet 10 and the negative electrode sheet 20 are arranged such that the exposed portion 33 of the positive electrode current collector 11 and the exposed portion 24 of the negative electrode current collector 21 are opposite to each other in the width direction. Yes. The width of the negative electrode mixture layer 22 is wider than the width of the positive electrode mixture layer 12. For this reason, the end portion 25 in the width direction of the negative electrode sheet 20 and the insulating layer 15 (the second region 32 on the positive electrode current collector 11) when viewed in plan from the stacking direction of the positive electrode sheet 10 and the negative electrode sheet 20. It arrange | positions so that it may overlap. In other words, the insulating layer 15 disposed in the second region 32 on the positive electrode current collector 11 and the end portion 25 in the width direction of the negative electrode sheet 20 are disposed so as to face each other in the stacking direction.

このとき、本実施の形態にかかる電極体１では、正極集電体１１上の第２の領域３２に形成されている絶縁層１５の樹脂粒子同士を熱溶着している。このように樹脂粒子同士を熱溶着することで（つまり、樹脂粒子をフィルム状とすることで）樹脂粒子同士の接着強度をあげることができる。   At this time, in the electrode body 1 according to the present embodiment, the resin particles of the insulating layer 15 formed in the second region 32 on the positive electrode current collector 11 are thermally welded. Thus, the adhesive strength of resin particles can be raised by thermally welding the resin particles (that is, by forming the resin particles into a film).

すなわち、図１７に示した電極体１０１では、正極集電体１１１上の絶縁層１１５は樹脂粒子（熱溶着していない樹脂粒子）を用いて構成されていた。熱溶着していない樹脂粒子は樹脂粒子同士の接着強度が弱いため、電極体１０１を捲回した際に、負極シート１２０のバリ１３０が正極集電体１１１上の絶縁層１１５を突き破り、正極と負極とが短絡してしまうおそれがあった。   That is, in the electrode body 101 shown in FIG. 17, the insulating layer 115 on the positive electrode current collector 111 is configured using resin particles (resin particles that are not thermally welded). Since the resin particles not thermally welded have a low adhesive strength between the resin particles, when the electrode body 101 is wound, the burr 130 of the negative electrode sheet 120 breaks through the insulating layer 115 on the positive electrode current collector 111, There was a possibility that the negative electrode would be short-circuited.

これに対して本実施の形態にかかる電極体１では、図２に示すように、正極集電体１１上の第２の領域３２に形成されている絶縁層１５の樹脂粒子同士を熱溶着している。このように樹脂粒子を熱溶着することで（つまり、樹脂粒子をフィルム状とすることで）樹脂粒子同士の接着強度をあげることができ、絶縁層１５の強度を向上させることができる。よって、負極シート２０を切断する際に発生したバリ（つまり、負極集電体２１の端部２５に発生したバリ）が絶縁層１５を突き破り、正極１０と負極２０とが短絡してしまうことを抑制することができる。   On the other hand, in the electrode body 1 according to the present embodiment, as shown in FIG. 2, the resin particles of the insulating layer 15 formed in the second region 32 on the positive electrode current collector 11 are thermally welded together. ing. Thus, by thermally welding the resin particles (that is, by forming the resin particles in a film shape), the adhesive strength between the resin particles can be increased, and the strength of the insulating layer 15 can be improved. Therefore, the burr generated when cutting the negative electrode sheet 20 (that is, the burr generated at the end 25 of the negative electrode current collector 21) breaks through the insulating layer 15 and the positive electrode 10 and the negative electrode 20 are short-circuited. Can be suppressed.

ここで、正極合剤層１２と負極合剤層２２とで挟まれる第１の領域３１における絶縁層１３は、リチウムイオンの通り道となる。一方、正極集電体１１上の第２の領域３２における絶縁層１５（つまり、正極合剤層１２の側面と接している絶縁層）は、リチウムイオンのメインの通り道とはならない。よって、本実施の形態のように、正極集電体１１上の第２の領域３２に形成されている絶縁層１５の樹脂粒子同士を熱溶着し、正極合剤層１２上に形成された絶縁層１３（第１の領域３１における絶縁層１３）の樹脂粒子については熱溶着しないことで（つまり、絶縁層１３の空孔を保った状態とすることで）、絶縁層１３におけるリチウムイオンの透過性を確保しつつ、正極１０と負極２０とが短絡してしまうことを抑制することができる。   Here, the insulating layer 13 in the first region 31 sandwiched between the positive electrode mixture layer 12 and the negative electrode mixture layer 22 becomes a path for lithium ions. On the other hand, the insulating layer 15 in the second region 32 on the positive electrode current collector 11 (that is, the insulating layer in contact with the side surface of the positive electrode mixture layer 12) does not become a main path for lithium ions. Therefore, as in the present embodiment, the resin particles of the insulating layer 15 formed in the second region 32 on the positive electrode current collector 11 are thermally welded together, and the insulating formed on the positive electrode mixture layer 12 The resin particles of the layer 13 (the insulating layer 13 in the first region 31) are not thermally welded (that is, by keeping the holes in the insulating layer 13), so that lithium ions can pass through the insulating layer 13. It can suppress that the positive electrode 10 and the negative electrode 20 short-circuit, ensuring the property.

例えば、本実施の形態では、図１に示すように正極シート１０および負極シート２０を積層した後、図３に示すように正極シート１０および負極シート２０を捲回することで捲回電極体を形成してもよい。また、例えば、図４に示すように複数の正極シート１０と複数の負極シート２０を交互に積層して電極体を形成してもよい。なお、正極シート１０および負極シート２０を捲回して捲回電極体を形成した場合も、図４に示すような複数の正極シート１０と複数の負極シート２０とが交互に積層された構造となる。   For example, in the present embodiment, after the positive electrode sheet 10 and the negative electrode sheet 20 are laminated as shown in FIG. 1, the positive electrode sheet 10 and the negative electrode sheet 20 are wound as shown in FIG. It may be formed. Further, for example, as shown in FIG. 4, a plurality of positive electrode sheets 10 and a plurality of negative electrode sheets 20 may be alternately stacked to form an electrode body. In addition, even when the positive electrode sheet 10 and the negative electrode sheet 20 are wound to form a wound electrode body, a plurality of positive electrode sheets 10 and a plurality of negative electrode sheets 20 are alternately stacked as shown in FIG. .

本実施の形態では、絶縁層１５の樹脂粒子同士を熱溶着しているので、正極シート１０および負極シート２０を捲回する時や正極集電体１１の露出部３３を集めて溶接する時に負極集電体２１の端部２５のバリが絶縁層１５を突き破り、正極１０と負極２０とが短絡してしまうことを抑制することができる。   In the present embodiment, since the resin particles of the insulating layer 15 are thermally welded, the negative electrode is wound when the positive electrode sheet 10 and the negative electrode sheet 20 are wound or when the exposed portion 33 of the positive electrode current collector 11 is collected and welded. It is possible to suppress the burr at the end portion 25 of the current collector 21 from breaking through the insulating layer 15 and short-circuiting the positive electrode 10 and the negative electrode 20.

更に本実施の形態では、図５に示す電極体１’のように、正極シート１０’の露出部３３と反対側の端部１６の側面を、樹脂粒子を含む絶縁層１７で覆うようにしてもよい。すなわち、正極シート１０’の端部１６の側面が露出した状態では、導電性の異物が混入した場合、正極シート１０’の端部１６と負極シート２０とが短絡するおそれがあった。しかし、図５に示す電極体１’のように、正極シート１０’の端部１６の側面を絶縁層１７で覆うことで、正極シート１０’の端部１６における短絡を抑制することができる。よって、正極１０’と負極２０とが短絡することをより確実に抑制することができる。   Further, in the present embodiment, as in the electrode body 1 ′ shown in FIG. 5, the side surface of the end portion 16 opposite to the exposed portion 33 of the positive electrode sheet 10 ′ is covered with the insulating layer 17 containing resin particles. Also good. That is, in a state where the side surface of the end portion 16 of the positive electrode sheet 10 ′ is exposed, there is a possibility that the end portion 16 of the positive electrode sheet 10 ′ and the negative electrode sheet 20 may be short-circuited when conductive foreign matter is mixed. However, a short circuit at the end 16 of the positive electrode sheet 10 ′ can be suppressed by covering the side surface of the end 16 of the positive electrode sheet 10 ′ with the insulating layer 17 as in the electrode body 1 ′ shown in FIG. 5. Therefore, a short circuit between the positive electrode 10 ′ and the negative electrode 20 can be more reliably suppressed.

このとき、図６に示す電極体１’’のように、正極シート１０’’の端部１６の側面を覆っている絶縁層１８の樹脂粒子同士を熱溶着してもよい。このように、絶縁層１８の樹脂粒子同士を熱溶着することで、樹脂粒子同士の接着強度をあげることができ、絶縁層１８の強度を向上させることができる。よって、図５に示した電極体１’の場合よりも、正極シート１０’’と負極シート２０とが短絡することをより確実に抑制することができる。   At this time, as in the electrode body 1 ″ shown in FIG. 6, the resin particles of the insulating layer 18 covering the side surface of the end portion 16 of the positive electrode sheet 10 ″ may be heat-welded. Thus, by thermally welding the resin particles of the insulating layer 18, the adhesive strength between the resin particles can be increased, and the strength of the insulating layer 18 can be improved. Therefore, short circuit between the positive electrode sheet 10 ″ and the negative electrode sheet 20 can be more reliably suppressed than in the case of the electrode body 1 ′ illustrated in FIG. 5.

また、本実施の形態では、図７に示す電極体２のように、負極合剤層２２上に絶縁層２３を設けてもよい。絶縁層２３は、正極シート１０と負極シート２０’とを積層した際に、正極シート１０と負極シート２０’とが短絡することを防止するセパレータとして機能する。絶縁層２３は、絶縁粒子を用いて構成することができる。絶縁粒子には、セラミック粒子や樹脂粒子を用いることができる。セラミック粒子としては、例えばアルミナ粒子を用いることができる。このように、正極シート１０に加えて、負極シート２０’にも絶縁層２３を設けることで、正極シート１０と負極シート２０’とが短絡することをより確実に抑制することができる。なお、図７では、負極シート２０’の両面に絶縁層２３を設けた場合を示したが、本実施の形態では、負極シート２０’の片面のみに絶縁層２３を設けるようにしてもよい。   Moreover, in this Embodiment, you may provide the insulating layer 23 on the negative mix layer 22 like the electrode body 2 shown in FIG. The insulating layer 23 functions as a separator that prevents the positive electrode sheet 10 and the negative electrode sheet 20 ′ from being short-circuited when the positive electrode sheet 10 and the negative electrode sheet 20 ′ are laminated. The insulating layer 23 can be configured using insulating particles. Ceramic particles or resin particles can be used for the insulating particles. For example, alumina particles can be used as the ceramic particles. In this way, by providing the negative electrode sheet 20 ′ with the insulating layer 23 in addition to the positive electrode sheet 10, it is possible to more reliably prevent the positive electrode sheet 10 and the negative electrode sheet 20 ′ from being short-circuited. FIG. 7 shows the case where the insulating layer 23 is provided on both surfaces of the negative electrode sheet 20 ′. However, in this embodiment, the insulating layer 23 may be provided only on one surface of the negative electrode sheet 20 ′.

次に、本実施の形態にかかる正極の製造方法について説明する。
図８は、本実施の形態にかかる正極の製造方法を説明するためのフローチャートである。正極（正極シート）を製造する際は、図９の断面図に示すように、帯状の正極集電体１１上の第１の領域３１に正極合剤層１２を形成する（図８のステップＳ１）。ここで、正極集電体１１上の第１乃至第３の領域３１〜３３は、正極集電体１１の幅方向において並んでいる。 Next, the manufacturing method of the positive electrode concerning this Embodiment is demonstrated.
FIG. 8 is a flowchart for explaining the method for manufacturing the positive electrode according to the present embodiment. When manufacturing the positive electrode (positive electrode sheet), as shown in the cross-sectional view of FIG. 9, the positive electrode mixture layer 12 is formed in the first region 31 on the strip-shaped positive electrode current collector 11 (step S1 in FIG. 8). ). Here, the first to third regions 31 to 33 on the positive electrode current collector 11 are arranged in the width direction of the positive electrode current collector 11.

具体的には、正極活物質と、導電材と、溶媒と、結着剤（バインダー）とを混練して正極合剤を形成し、混練後の正極合剤を正極集電体１１の第１の領域３１の両面に塗布して乾燥することによって正極合剤層１２を形成することができる。ここで、溶媒としては、例えばＮＭＰ（Ｎ−メチル−２−ピロリドン）溶液を用いることができる。また、バインダーとしては、例えば、ポリフッ化ビニリデン（ＰＶｄＦ）、スチレンブタジエンラバー（ＳＢＲ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、カルボキシメチルセルロース（ＣＭＣ）等を用いることができる。   Specifically, a positive electrode active material, a conductive material, a solvent, and a binder (binder) are kneaded to form a positive electrode mixture, and the kneaded positive electrode mixture is used as the first positive electrode current collector 11. The positive electrode mixture layer 12 can be formed by applying to both sides of the region 31 and drying. Here, as the solvent, for example, an NMP (N-methyl-2-pyrrolidone) solution can be used. As the binder, for example, polyvinylidene fluoride (PVdF), styrene butadiene rubber (SBR), polytetrafluoroethylene (PTFE), carboxymethyl cellulose (CMC), or the like can be used.

その後、図１０の断面図に示すように、正極集電体１１上の第２の領域３２および正極合剤層３１上に、正極合剤層３１を覆うように樹脂粒子を塗布して絶縁層１３を形成する（図８のステップＳ２）。正極集電体１１上の第２の領域３２は、第１の領域３１と第３の領域３３とに挟まれた領域である。絶縁層１３を形成する際は、例えばグラビア塗工装置を用いて絶縁粒子を塗工する。図１１、図１２は、グラビア塗工装置４１を用いて樹脂粒子を塗工する工程を説明するための図である。図１２は、図１１に示すグラビア塗工装置４１を正極シート５１の搬送方向上流側（つまり、図１１の紙面左側）から見た図である。ここで、正極シート５１は図８のステップＳ１で形成された正極シート５１であり、正極集電体１１上の第１の領域３１に正極合剤層１２が形成された正極シート５１（図９参照）である。   Thereafter, as shown in the cross-sectional view of FIG. 10, resin particles are applied on the second region 32 and the positive electrode mixture layer 31 on the positive electrode current collector 11 so as to cover the positive electrode mixture layer 31, thereby insulating layers. 13 is formed (step S2 in FIG. 8). The second region 32 on the positive electrode current collector 11 is a region sandwiched between the first region 31 and the third region 33. When forming the insulating layer 13, the insulating particles are applied using, for example, a gravure coating apparatus. 11 and 12 are diagrams for explaining a process of applying resin particles using the gravure coating apparatus 41. FIG. FIG. 12 is a view of the gravure coating apparatus 41 shown in FIG. 11 as viewed from the upstream side in the conveyance direction of the positive electrode sheet 51 (that is, the left side in FIG. 11). Here, the positive electrode sheet 51 is the positive electrode sheet 51 formed in step S1 of FIG. 8, and the positive electrode sheet 51 in which the positive electrode mixture layer 12 is formed in the first region 31 on the positive electrode current collector 11 (FIG. 9). Reference).

図１１に示すように、グラビア塗工装置４１は、複数のローラー４２、液槽４３、グラビアロール４５、及びドクターブレード４６を備える。複数のローラー４２は、正極合剤層１２が形成された後の正極シート５１を搬送方向（図１１の矢印に示す）に搬送する。液槽４３は、絶縁粒子を含むペースト４４を保持すると共に、ペースト４４をグラビアロール４５の外周表面に供給する。絶縁粒子を含むペースト４４は、例えば、絶縁粒子と溶媒と増粘剤とを混合することで作製することができる。グラビアロール４５は、ペースト４４を正極シート５１の表面（つまり、正極集電体１１上の第２の領域３２および正極合剤層１２上）に転写して塗布する。ドクターブレード４６は、グラビアロール４５の外周表面に付着した余分なペースト４４を掻き取る。   As shown in FIG. 11, the gravure coating apparatus 41 includes a plurality of rollers 42, a liquid tank 43, a gravure roll 45, and a doctor blade 46. The plurality of rollers 42 transport the positive electrode sheet 51 after the positive electrode mixture layer 12 is formed in the transport direction (indicated by an arrow in FIG. 11). The liquid tank 43 holds the paste 44 containing insulating particles and supplies the paste 44 to the outer peripheral surface of the gravure roll 45. The paste 44 containing insulating particles can be produced, for example, by mixing insulating particles, a solvent, and a thickener. The gravure roll 45 transfers and applies the paste 44 to the surface of the positive electrode sheet 51 (that is, on the second region 32 and the positive electrode mixture layer 12 on the positive electrode current collector 11). The doctor blade 46 scrapes off excess paste 44 adhering to the outer peripheral surface of the gravure roll 45.

図１２に示すように、グラビアロール４５の外周表面に保持されているペーストは、搬送されてきた正極シート５１の表面に塗布される。このとき、正極集電体１１の露出部（第３の領域）３３にマスキングテープ４８を設けることで、ペースト４４が正極集電体１１の露出部３３に塗布されることを防止することができる。また、図１２に示すように、グラビアロール４５の溝４７の方向を、正極シート５１の第２の領域３２側へと向かうように傾斜させることで、ペースト４４が流れる方向を溝４７に沿った方向（図１２の矢印４９に示す方向）とすることができる。これにより、正極集電体１１上の第２の領域３２にペースト４４を塗布することができる。グラビア塗工装置４１を用いて正極シート５１の表面に絶縁粒子（絶縁層１３）を塗工する工程は、正極シート５１の両面に対して実施する。このような方法を用いることで、図１０に示すような、正極集電体１１上の第２の領域３２および正極合剤層１２上に絶縁層１３が形成された正極シート５２を作製することができる。   As shown in FIG. 12, the paste held on the outer peripheral surface of the gravure roll 45 is applied to the surface of the positive electrode sheet 51 that has been conveyed. At this time, it is possible to prevent the paste 44 from being applied to the exposed portion 33 of the positive electrode current collector 11 by providing the masking tape 48 on the exposed portion (third region) 33 of the positive electrode current collector 11. . 12, the direction of the groove 47 of the gravure roll 45 is inclined so as to be directed toward the second region 32 side of the positive electrode sheet 51, so that the direction in which the paste 44 flows is along the groove 47. Direction (direction shown by an arrow 49 in FIG. 12). Thereby, the paste 44 can be applied to the second region 32 on the positive electrode current collector 11. The step of applying insulating particles (insulating layer 13) to the surface of the positive electrode sheet 51 using the gravure coating device 41 is performed on both surfaces of the positive electrode sheet 51. By using such a method, the positive electrode sheet 52 in which the insulating layer 13 is formed on the second region 32 on the positive electrode current collector 11 and the positive electrode mixture layer 12 as shown in FIG. 10 is produced. Can do.

絶縁層１３が形成された正極シート５２を作製した後、絶縁層１３が形成された正極シート５２を加熱して、正極集電体１１上の第２の領域３２に形成されている絶縁層１３の樹脂粒子同士を選択的に熱溶着する（図８のステップＳ３）。つまり、正極集電体１１上の第２の領域３２および正極合剤層３１上に形成された絶縁層のうち、正極集電体１１上の第２の領域３２に形成された絶縁層の樹脂粒子同士を熱溶着し、正極合剤層３１上に形成された絶縁層の樹脂粒子については熱溶着しないようにする。このとき、正極合剤層１２上に形成されている絶縁層１３からは水分が蒸発して乾燥される。   After producing the positive electrode sheet 52 on which the insulating layer 13 is formed, the positive electrode sheet 52 on which the insulating layer 13 is formed is heated to form the insulating layer 13 formed in the second region 32 on the positive electrode current collector 11. These resin particles are selectively thermally welded (step S3 in FIG. 8). That is, out of the insulating layer formed on the second region 32 and the positive electrode mixture layer 31 on the positive electrode current collector 11, the resin of the insulating layer formed on the second region 32 on the positive electrode current collector 11. The particles are thermally welded so that the resin particles of the insulating layer formed on the positive electrode mixture layer 31 are not thermally welded. At this time, moisture is evaporated from the insulating layer 13 formed on the positive electrode mixture layer 12 and dried.

樹脂粒子同士を熱溶着する際は、図１３の上面図に示すように、絶縁層１３が形成された正極シート５２を乾燥炉６０内に導入する。乾燥炉６０は、導入口６１と搬出口６２とを備えている。乾燥炉６０の内部には、正極シート５２の表面（両面）に熱風を吹き付けるための機構（例えば、ヒータとファン）が設けられている。   When the resin particles are thermally welded, the positive electrode sheet 52 on which the insulating layer 13 is formed is introduced into the drying furnace 60 as shown in the top view of FIG. The drying furnace 60 includes an inlet 61 and a carry-out port 62. Inside the drying furnace 60, a mechanism (for example, a heater and a fan) for blowing hot air onto the surface (both sides) of the positive electrode sheet 52 is provided.

絶縁層１３が形成された正極シート５２は導入口６１から乾燥炉６０に導入され、乾燥炉６０内において加熱される。これにより、正極集電体１１上の第２の領域３２に形成されている絶縁層の樹脂粒子同士が熱溶着される。樹脂粒子同士が熱溶着された後の正極シート５３は、搬出口６２から排出される。例えば、正極シート５２は乾燥炉６０内を連続的に搬送される。   The positive electrode sheet 52 on which the insulating layer 13 is formed is introduced into the drying furnace 60 through the inlet 61 and heated in the drying furnace 60. Thereby, the resin particles of the insulating layer formed in the second region 32 on the positive electrode current collector 11 are thermally welded. The positive electrode sheet 53 after the resin particles are thermally welded is discharged from the carry-out port 62. For example, the positive electrode sheet 52 is continuously conveyed in the drying furnace 60.

図１４の断面図（上図）に示すように、乾燥炉６０内において正極シート５２の表面に熱風６５が吹き付けられると、正極シート５２が加熱される。このとき、正極集電体１１は金属（アルミニウム）で構成されているので熱伝導が高い。よって、正極集電体１１の第３の領域３３に熱風６５が吹き付けられると、正極集電体１１の第３の領域３３から第２の領域３２へと熱が伝わり、正極集電体１１の第２の領域３２が加熱される。一方、正極集電体１１の第１の領域３１には、熱容量の大きい正極合剤層１２が形成されているので、正極集電体１１の第１の領域３１は加熱されにくい。このため、正極集電体１１の第２の領域３２は第１の領域３１よりも温度が高くなる。   As shown in the cross-sectional view (upper view) of FIG. 14, when hot air 65 is blown onto the surface of the positive electrode sheet 52 in the drying furnace 60, the positive electrode sheet 52 is heated. At this time, since the positive electrode current collector 11 is made of metal (aluminum), heat conduction is high. Therefore, when the hot air 65 is blown to the third region 33 of the positive electrode current collector 11, heat is transmitted from the third region 33 of the positive electrode current collector 11 to the second region 32, and the positive electrode current collector 11 The second region 32 is heated. On the other hand, since the positive electrode mixture layer 12 having a large heat capacity is formed in the first region 31 of the positive electrode current collector 11, the first region 31 of the positive electrode current collector 11 is hardly heated. For this reason, the temperature of the second region 32 of the positive electrode current collector 11 is higher than that of the first region 31.

また、正極合剤層１２上の樹脂粒子に加えられた熱は、熱容量の大きい正極合剤層１２へと伝わる。一方、正極集電体１１上の第２の領域３２の樹脂粒子に加えられた熱は、正極集電体１１の第２の領域３２における温度が高いために逃げ場がなくなる。このため、正極集電体１１上の第２の領域３２の樹脂粒子が融点以上に加熱されて熱溶着される。これに対して、正極合剤層１２上の絶縁層１３の温度は融点以上とはならないため、正極合剤層１２上の絶縁層１３は熱溶着されない。これにより、図１４の断面図（下図）に示すように、正極集電体１１上の第２の領域３２に形成されている絶縁層１５の樹脂粒子同士のみを選択的に熱溶着することができる。   Further, the heat applied to the resin particles on the positive electrode mixture layer 12 is transferred to the positive electrode mixture layer 12 having a large heat capacity. On the other hand, the heat applied to the resin particles in the second region 32 on the positive electrode current collector 11 disappears because the temperature in the second region 32 of the positive electrode current collector 11 is high. For this reason, the resin particles in the second region 32 on the positive electrode current collector 11 are heated to the melting point or higher and thermally welded. On the other hand, since the temperature of the insulating layer 13 on the positive electrode mixture layer 12 does not exceed the melting point, the insulating layer 13 on the positive electrode mixture layer 12 is not thermally welded. Thereby, as shown in the cross-sectional view of FIG. 14 (lower figure), only the resin particles of the insulating layer 15 formed in the second region 32 on the positive electrode current collector 11 can be selectively thermally welded. it can.

正極シート５２の表面に吹き付ける熱風６５の温度は、樹脂粒子の融点以上の温度とする。例えば、絶縁層１３、１５を構成する樹脂粒子としてポリエチレン粒子を用いた場合は、正極シート５２の表面に吹き付ける熱風６５の温度は、ポリエチレン粒子の融点である１３０℃以上、好ましくは１３０℃〜１９０℃とする。絶縁層１３、１５にポリエチレン粒子を用いた場合は、ポリエチレン粒子の融点が低いので、熱溶着する際の温度を低くすることができる。   The temperature of the hot air 65 sprayed on the surface of the positive electrode sheet 52 is set to a temperature equal to or higher than the melting point of the resin particles. For example, when polyethylene particles are used as the resin particles constituting the insulating layers 13 and 15, the temperature of the hot air 65 sprayed on the surface of the positive electrode sheet 52 is 130 ° C. or higher, preferably 130 ° C. to 190 ° C., which is the melting point of the polyethylene particles. ℃. When polyethylene particles are used for the insulating layers 13 and 15, since the melting point of the polyethylene particles is low, the temperature at the time of heat welding can be lowered.

本実施の形態にかかる正極の製造方法では、正極集電体１１上の第２の領域３２および正極合剤層３１上に樹脂粒子を塗布（図８のステップＳ２）した後、第２の領域３２の樹脂粒子を選択的に熱溶着（ステップＳ３）している。よって、図１４の下図に示すように、正極合剤層３１上の絶縁層１３と正極集電体１１上の第２の領域３２の絶縁層１５とを連続的に形成することができる。つまり、絶縁層１３と絶縁層１５とを別々に形成すると（すなわち、別々の工程で形成すると）絶縁層１３と絶縁層１５との間に隙間が生じる場合があるが、上記で説明したような本実施の形態にかかる製造方法を用いることで、絶縁層１３と絶縁層１５との間に隙間が形成されることを抑制することができる。   In the method for manufacturing the positive electrode according to the present embodiment, resin particles are applied on the second region 32 and the positive electrode mixture layer 31 on the positive electrode current collector 11 (step S2 in FIG. 8), and then the second region. The 32 resin particles are selectively thermally welded (step S3). Therefore, as shown in the lower diagram of FIG. 14, the insulating layer 13 on the positive electrode mixture layer 31 and the insulating layer 15 in the second region 32 on the positive electrode current collector 11 can be formed continuously. That is, if the insulating layer 13 and the insulating layer 15 are formed separately (that is, formed in separate steps), a gap may be formed between the insulating layer 13 and the insulating layer 15, but as described above. By using the manufacturing method according to the present embodiment, formation of a gap between the insulating layer 13 and the insulating layer 15 can be suppressed.

なお、上記で説明した正極の製造方法では、正極集電体１１の両面に樹脂粒子を塗布（図８のステップＳ２）した後に、第２の領域３２の樹脂粒子（正極集電体１１の両面の樹脂粒子）を熱溶着（ステップＳ３）していた。しかし、本実施の形態にかかる正極の製造方法では、正極集電体１１の一方の面（片面）に樹脂粒子を塗布した後に、第２の領域３２の樹脂粒子（正極集電体１１の一方の面の樹脂粒子）を熱溶着し、その後、正極集電体１１の他方の面（片面）に樹脂粒子を塗布した後に、第２の領域３２の樹脂粒子（正極集電体１１の他方の面の樹脂粒子）を熱溶着するようにしてもよい。換言すると、正極集電体１１の片面毎に絶縁層１３、１５を形成するようにしてもよい。   In the positive electrode manufacturing method described above, resin particles are applied to both surfaces of the positive electrode current collector 11 (step S2 in FIG. 8), and then the resin particles in the second region 32 (both surfaces of the positive electrode current collector 11). Resin particles) was thermally welded (step S3). However, in the method for manufacturing the positive electrode according to the present embodiment, after the resin particles are applied to one surface (one surface) of the positive electrode current collector 11, the resin particles in the second region 32 (one of the positive electrode current collector 11) are applied. After the resin particles are applied to the other surface (one surface) of the positive electrode current collector 11, the resin particles in the second region 32 (the other of the positive electrode current collector 11) The surface resin particles) may be heat-welded. In other words, the insulating layers 13 and 15 may be formed on each side of the positive electrode current collector 11.

以上で説明した正極の製造方法を用いることで、本実施の形態にかかる電極体１が備える正極を製造することができる。なお、本実施の形態にかかる電極体１を作製する際は、更に負極シートを形成する。負極シート２０（図２参照）は、負極活物質と、導電材と、溶媒と、バインダーとを混練し、混練後の負極合剤を負極集電体２１の両面に塗布して乾燥することによって作製することができる。このとき、負極シート２０の幅方向の一端（つまり、図１に示す負極シート２０の下側）には、負極集電体２１が露出している露出部２４（つまり、負極合剤層２２が塗工されていない部分）を設ける。   By using the positive electrode manufacturing method described above, the positive electrode included in the electrode body 1 according to the present embodiment can be manufactured. In addition, when producing the electrode body 1 concerning this Embodiment, a negative electrode sheet is further formed. The negative electrode sheet 20 (see FIG. 2) is obtained by kneading a negative electrode active material, a conductive material, a solvent, and a binder, applying the kneaded negative electrode mixture on both surfaces of the negative electrode current collector 21, and drying. Can be produced. At this time, the exposed portion 24 (that is, the negative electrode mixture layer 22) where the negative electrode current collector 21 is exposed is formed at one end in the width direction of the negative electrode sheet 20 (that is, the lower side of the negative electrode sheet 20 illustrated in FIG. 1). Provide an uncoated part).

そして、上記のようにして正極シート１０および負極シート２０を作製した後、正極シート１０および負極シート２０を積層する。正極シート１０および負極シート２０を積層する際は、図２に示すように、正極集電体１１の露出部３３と負極集電体２１の露出部２４とが幅方向において互いに反対側になるように配置する。正極シート１０および負極シート２０を積層した後、図３に示すように正極シート１０および負極シート２０を捲回することで捲回電極体を形成することができる。また、図４に示すように複数の正極シート１０と複数の負極シート２０を交互に積層して電極体を形成してもよい。   And after producing the positive electrode sheet 10 and the negative electrode sheet 20 as mentioned above, the positive electrode sheet 10 and the negative electrode sheet 20 are laminated | stacked. When laminating the positive electrode sheet 10 and the negative electrode sheet 20, as shown in FIG. 2, the exposed portion 33 of the positive electrode current collector 11 and the exposed portion 24 of the negative electrode current collector 21 are opposite to each other in the width direction. To place. After laminating the positive electrode sheet 10 and the negative electrode sheet 20, the wound electrode body can be formed by winding the positive electrode sheet 10 and the negative electrode sheet 20 as shown in FIG. In addition, as shown in FIG. 4, a plurality of positive electrode sheets 10 and a plurality of negative electrode sheets 20 may be alternately stacked to form an electrode body.

以上で説明した本実施の形態にかかる発明により、絶縁層に樹脂粒子を用いた場合であっても、正極と負極との短絡を抑制することが可能な電極体および正極の製造方法を提供することができる。   The invention according to the present embodiment described above provides an electrode body capable of suppressing a short circuit between a positive electrode and a negative electrode even when resin particles are used for the insulating layer, and a method for manufacturing the positive electrode. be able to.

次に、本発明の実施例について説明する。
上記で説明した方法を用いて、図２に示した構成を備える電極体１（捲回電極体）を形成した。このとき、正極集電体１１上の第２の領域３２に形成されている絶縁層１５の樹脂粒子同士を熱溶着した（実施例）。また、比較例として、絶縁層の樹脂粒子同士を熱溶着していないサンプルを作製した（図１６、図１７参照）。 Next, examples of the present invention will be described.
Using the method described above, an electrode body 1 (rolled electrode body) having the configuration shown in FIG. 2 was formed. At this time, the resin particles of the insulating layer 15 formed in the second region 32 on the positive electrode current collector 11 were thermally welded (Example). As a comparative example, a sample in which the resin particles of the insulating layer were not thermally welded was prepared (see FIGS. 16 and 17).

そして、正極シート１０および負極シート２０を捲回した後、正極と負極の短絡の有無を調べた。短絡の有無は、電極体の抵抗値、つまり、正極と負極との間の抵抗値を測定して判定した。このときの判定基準値を１ＧΩとした。すなわち、正極と負極との間の抵抗値が１ＧΩ以上の場合は短絡無しと判定し、１ＧΩよりも小さい場合は短絡有りと判定した。   And after winding the positive electrode sheet 10 and the negative electrode sheet 20, the presence or absence of the short circuit of a positive electrode and a negative electrode was investigated. The presence or absence of a short circuit was determined by measuring the resistance value of the electrode body, that is, the resistance value between the positive electrode and the negative electrode. The criterion value at this time was 1 GΩ. That is, when the resistance value between the positive electrode and the negative electrode was 1 GΩ or more, it was determined that there was no short circuit, and when it was less than 1 GΩ, it was determined that there was a short circuit.

絶縁層（ポリエチレン粒子）の熱溶着の有無と電極体の短絡の有無との関係を図１５に示す。図１５に示すように、正極シートの絶縁層を熱溶着していないサンプル（比較例）では、捲回後の電極体の正極と負極とが短絡していた。これは、負極シートを切断した際に発生したバリが絶縁層（樹脂粒子）を突き破り、これにより正極と負極とが短絡したためであると考えられる。   FIG. 15 shows the relationship between the presence or absence of thermal welding of the insulating layer (polyethylene particles) and the presence or absence of a short circuit of the electrode body. As shown in FIG. 15, in the sample (comparative example) in which the insulating layer of the positive electrode sheet was not thermally welded, the positive electrode and the negative electrode of the electrode body after winding were short-circuited. This is considered to be because the burr generated when the negative electrode sheet was cut pierced the insulating layer (resin particles), thereby causing a short circuit between the positive electrode and the negative electrode.

一方、正極シート１０の第２の領域３２の絶縁層１５を熱溶着したサンプル（実施例）では、捲回後の電極体の正極と負極とが短絡していなかった。よって、本発明のように絶縁層１５（樹脂粒子）を熱溶着することで樹脂粒子同士の接着強度をあげることができ、負極シート１０を切断する際に発生したバリが絶縁層１５を突き破ることを抑制することができた。   On the other hand, in the sample (Example) in which the insulating layer 15 of the second region 32 of the positive electrode sheet 10 was thermally welded, the positive electrode and the negative electrode of the electrode body after winding were not short-circuited. Therefore, the adhesive strength between the resin particles can be increased by thermally welding the insulating layer 15 (resin particles) as in the present invention, and burrs generated when cutting the negative electrode sheet 10 break through the insulating layer 15. Could be suppressed.

以上、本発明を上記実施の形態に即して説明したが、本発明は上記実施の形態の構成にのみ限定されるものではなく、本願特許請求の範囲の請求項の発明の範囲内で当業者であればなし得る各種変形、修正、組み合わせを含むことは勿論である。   Although the present invention has been described with reference to the above embodiment, the present invention is not limited only to the configuration of the above embodiment, and within the scope of the invention of the claims of the present application. It goes without saying that various modifications, corrections, and combinations that can be made by those skilled in the art are included.

１、２ 電極体
１０ 正極（正極シート）
１１ 正極集電体
１２ 正極合剤層
１３ 絶縁層
１５ 絶縁層（熱溶着）
１６ 端部
１７ 絶縁層
１８ 絶縁層（熱溶着）
２０ 負極（負極シート）
２１ 負極集電体
２２ 負極合剤層
２３ 絶縁層
２４ 露出部
２５ 端部
３１ 第１の領域
３２ 第２の領域
３３ 第３の領域
４１ グラビア塗工装置
４２ ローラー
４３ 液槽
４４ ペースト
４５ グラビアロール
４６ ドクターブレード
５１ 正極シート（正極集電体＋正極合剤層）
５２ 正極シート（正極集電体＋正極合剤層＋絶縁層）
５３ 正極シート（正極集電体＋正極合剤層＋絶縁層（溶着あり））
６０ 乾燥炉
６１ 導入口
６２ 搬出口
６５ 熱風 1, 2 Electrode body 10 Positive electrode (positive electrode sheet)
DESCRIPTION OF SYMBOLS 11 Positive electrode collector 12 Positive electrode mixture layer 13 Insulating layer 15 Insulating layer (thermal welding)
16 End 17 Insulating layer 18 Insulating layer (thermal welding)
20 Negative electrode (negative electrode sheet)
DESCRIPTION OF SYMBOLS 21 Negative electrode collector 22 Negative electrode mixture layer 23 Insulating layer 24 Exposed part 25 End part 31 1st area | region 32 2nd area | region 33 3rd area | region 41 Gravure coating apparatus 42 Roller 43 Liquid tank 44 Paste 45 Gravure roll 46 Doctor blade 51 positive electrode sheet (positive electrode current collector + positive electrode mixture layer)
52 Positive electrode sheet (positive electrode current collector + positive electrode mixture layer + insulating layer)
53 Positive electrode sheet (positive electrode current collector + positive electrode mixture layer + insulating layer (with welding))
60 Drying furnace 61 Inlet 62 Outlet 65 Hot air

Claims (8)

正極と負極とが積層された非水電解質二次電池用の電極体であって、
前記正極は、正極集電体と、当該正極集電体上の第１の領域に形成された正極合剤層と、前記正極集電体上の前記第１の領域と幅方向において隣り合う第２の領域および前記正極合剤層上に当該正極合剤層を覆うように形成された樹脂粒子を含む絶縁層と、を備えると共に、前記正極集電体の前記第２の領域を基準として前記第１の領域と反対側の第３の領域に前記正極合剤層および前記絶縁層が形成されておらず前記正極集電体が露出している露出部を備え、
前記負極は、負極集電体と、当該負極集電体上に形成された負極合剤層と、を備えると共に、前記負極の幅方向の一方の端部側において前記負極合剤層が形成されておらず前記負極集電体が露出している露出部を備え、
前記正極および前記負極は、前記正極集電体の露出部と前記負極集電体の露出部とが幅方向において互いに反対側になるように、且つ、前記正極および前記負極の積層方向から平面視した際に、前記負極の幅方向の他方の端部が前記正極集電体上の前記第２の領域に形成されている前記絶縁層と重畳するように配置されており、
前記正極集電体上の前記第２の領域に形成されている前記絶縁層の樹脂粒子同士が熱溶着していることを特徴とする、
電極体。 An electrode body for a non-aqueous electrolyte secondary battery in which a positive electrode and a negative electrode are laminated,
The positive electrode includes a positive electrode current collector, a positive electrode mixture layer formed in a first region on the positive electrode current collector, and a first electrode adjacent to the first region on the positive electrode current collector in the width direction. 2 and an insulating layer including resin particles formed on the positive electrode mixture layer so as to cover the positive electrode mixture layer, and the second region of the positive electrode current collector as a reference. An exposed portion in which the positive electrode mixture layer and the insulating layer are not formed in the third region opposite to the first region and the positive electrode current collector is exposed;
The negative electrode includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, and the negative electrode mixture layer is formed on one end side in the width direction of the negative electrode. An exposed portion where the negative electrode current collector is exposed,
The positive electrode and the negative electrode are viewed in plan from the stacking direction of the positive electrode and the negative electrode so that the exposed portion of the positive electrode current collector and the exposed portion of the negative electrode current collector are opposite to each other in the width direction. When arranged, the other end in the width direction of the negative electrode is disposed so as to overlap the insulating layer formed in the second region on the positive electrode current collector,
The resin particles of the insulating layer formed in the second region on the positive electrode current collector are thermally welded,
Electrode body. 前記樹脂粒子はポリエチレン粒子である、請求項１に記載の電極体。   The electrode body according to claim 1, wherein the resin particles are polyethylene particles. 前記正極は更に、当該正極の露出部と反対側の端部側面が樹脂粒子を含む絶縁層で覆われている、請求項１または２に記載の電極体。   The electrode body according to claim 1 or 2, wherein the positive electrode is further covered with an insulating layer containing resin particles on an end portion side surface opposite to the exposed portion of the positive electrode. 前記正極の前記端部側面を覆っている前記絶縁層の樹脂粒子同士が熱溶着している、請求項３に記載の電極体。   The electrode body according to claim 3, wherein the resin particles of the insulating layer covering the side surface of the end portion of the positive electrode are heat-welded. 前記電極体は、前記正極と前記負極とを互いに積層して捲回した捲回電極体である、請求項１乃至４のいずれか一項に記載の電極体。   The electrode body according to any one of claims 1 to 4, wherein the electrode body is a wound electrode body in which the positive electrode and the negative electrode are laminated and wound together. 長手方向に伸びる第１乃至第３の領域が幅方向において並んでいる帯状の正極集電体上の前記第１の領域に正極合剤層を形成する工程と、
前記正極集電体上の前記第３の領域を露出させつつ、前記正極集電体上の前記第１の領域と前記第３の領域とに挟まれた前記第２の領域および前記正極合剤層上に当該正極合剤層を覆うように樹脂粒子を塗布して絶縁層を形成する工程と、
前記絶縁層を形成した後の正極を加熱して、前記正極集電体上の前記第２の領域に形成されている前記絶縁層の樹脂粒子同士を選択的に熱溶着する工程と、を備える、請求項１乃至５のいずれか一項に記載の電極体が備える正極の製造方法。 Forming a positive electrode mixture layer in the first region on the belt-like positive electrode current collector in which the first to third regions extending in the longitudinal direction are arranged in the width direction;
The second region and the positive electrode mixture sandwiched between the first region and the third region on the positive electrode current collector while exposing the third region on the positive electrode current collector Forming an insulating layer by applying resin particles so as to cover the positive electrode mixture layer on the layer;
Heating the positive electrode after forming the insulating layer, and selectively thermally welding the resin particles of the insulating layer formed in the second region on the positive electrode current collector. The manufacturing method of the positive electrode with which the electrode body as described in any one of Claims 1 thru | or 5 is provided . 前記樹脂粒子同士を熱溶着する際、前記絶縁層を形成した後の正極を乾燥炉内に導入し、当該正極の表面に前記樹脂粒子の融点以上の温度の熱風を吹き付ける、請求項６に記載の電極体が備える正極の製造方法。 The said positive electrode after forming the said insulating layer is introduce | transduced in a drying furnace when heat-welding the said resin particles, The hot air of the temperature more than the melting | fusing point of the said resin particle is sprayed on the surface of the said positive electrode. The manufacturing method of the positive electrode with which this electrode body is provided . 前記樹脂粒子がポリエチレン粒子である場合、前記正極の表面に吹き付ける熱風の温度を１３０℃〜１９０℃とする、請求項７に記載の電極体が備える正極の製造方法。 The manufacturing method of the positive electrode with which the electrode body of Claim 7 with which the temperature of the hot air sprayed on the surface of the said positive electrode shall be 130 to 190 degreeC, when the said resin particle is a polyethylene particle.
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