JP2016009556A - Secondary battery electrode - Google Patents

Secondary battery electrode Download PDF

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JP2016009556A
JP2016009556A JP2014128724A JP2014128724A JP2016009556A JP 2016009556 A JP2016009556 A JP 2016009556A JP 2014128724 A JP2014128724 A JP 2014128724A JP 2014128724 A JP2014128724 A JP 2014128724A JP 2016009556 A JP2016009556 A JP 2016009556A
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carbon
intermediate layer
negative electrode
active material
electrode active
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JP6403151B2 (en
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浩一 生杉
Koichi Namasugi
浩一 生杉
俊夫 滝谷
Toshio Takiya
俊夫 滝谷
和志 平岡
Kazuyuki Hiraoka
和志 平岡
福田　直晃
Naoaki Fukuda
直晃 福田
美奈子 加藤
Minako Kato
美奈子 加藤
周　豪慎
Goshin Shu
豪慎 周
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Hitachi Zosen Corp
National Institute of Advanced Industrial Science and Technology AIST
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National Institute of Advanced Industrial Science and Technology AIST
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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
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    • Y02E60/10—Energy storage using batteries

Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery electrode by which the worsening of a battery performance can be prevented.SOLUTION: A secondary battery electrode 10 comprises: a substrate 1; a carbon-based material 2 disposed on the substrate 1; a negative electrode active material absorber layer 3 disposed on the surface of the carbon-based material 2 and made of a material absorbing a negative electrode active material; and an intermediate layer 4 disposed between the carbon-based material 2 and the negative electrode active material absorber layer 3 and made of a material which allows electrons to travel between the carbon-based material 2 and the negative electrode active material absorber layer 3.

Description

本発明は二次電池用電極に関する。   The present invention relates to an electrode for a secondary battery.

従来の二次電池用電極の例として、電極活物質の吸収量を増加させるため、基板上に生成されたカーボンナノチューブの周囲にシース状（鞘状）にシリコン粒子のフィルムが直接堆積されたものがある（例えば特許文献１）。なお、一般的に、シリコンはカーボンよりも電極活物質の吸収量が多いことが知られている。   As an example of a conventional secondary battery electrode, a film of silicon particles is directly deposited in a sheath shape (sheath shape) around carbon nanotubes generated on a substrate in order to increase the amount of absorption of an electrode active material (For example, Patent Document 1). In general, it is known that silicon absorbs more electrode active material than carbon.

特表２００９−５２１０８２号公報Special table 2009-521082 gazette

しかし、このような従来の二次電池用電極においては、カーボンナノチューブの表面にシリコン粒子のフィルムを直接堆積させているため、カーボンナノチューブとシリコン粒子のフィルムとの間に、カーボンナノチューブとシリコンとが反応して生成されるシリコンカーバイドの層が形成される可能性がある。このシリコンカーバイドの層は、シリコンよりも絶縁性が高いため電極としての電気抵抗値が増大してしまい、電池性能が低下する惧れがある。   However, in such a conventional secondary battery electrode, since a film of silicon particles is directly deposited on the surface of the carbon nanotube, the carbon nanotube and the silicon are interposed between the carbon nanotube and the silicon particle film. A layer of silicon carbide produced by reaction may be formed. Since this silicon carbide layer has higher insulation than silicon, the electrical resistance value as an electrode increases, and there is a concern that the battery performance may be lowered.

本発明は上記問題点を解決して、電池性能の低下を防止し得る二次電池用電極を提供することを目的とする。   An object of the present invention is to solve the above problems and provide an electrode for a secondary battery that can prevent a decrease in battery performance.

本発明の二次電池用電極は、基板と、当該基板上に配置される炭素系材料と、当該炭素系材料の表面に配置されて負極活物質を吸収する材料から成る負極活物質吸収層とから成る二次電池用電極において、
前記炭素系材料と前記負極活物質吸収層との間に、前記炭素系材料と前記負極活物質吸収層との間での電子移動を可能とする材料から成る中間層が配置されることを特徴とする。 An electrode for a secondary battery according to the present invention includes a substrate, a carbon-based material disposed on the substrate, and a negative electrode active material absorbing layer made of a material disposed on the surface of the carbon-based material and absorbing the negative electrode active material. A secondary battery electrode comprising:
An intermediate layer made of a material that enables electron transfer between the carbon-based material and the negative electrode active material absorption layer is disposed between the carbon-based material and the negative electrode active material absorption layer. And

また、中間層は、チタン、銅、ジルコニウム、それらの酸化物、それらの炭化物、又はこれらを少なくとも二種以上組み合わせた材料から成ることが好ましい。
また、中間層は、チタンの第１中間層と、チタンカーバイドの第２中間層とで構成されることが好ましい。このとき、炭素系材料の表面に第２中間層が、当該第２中間層の表面に第１中間層がそれぞれ配置されることがより好ましい。 Moreover, it is preferable that an intermediate | middle layer consists of a material which combined titanium, copper, zirconium, those oxides, those carbides, or these 2 or more types.
The intermediate layer is preferably composed of a first intermediate layer of titanium and a second intermediate layer of titanium carbide. At this time, it is more preferable that the second intermediate layer is disposed on the surface of the carbon-based material, and the first intermediate layer is disposed on the surface of the second intermediate layer.

また、炭素系材料は、カーボンナノチューブ、カーボンファイバー及び活性炭でできた繊維のうちのいずれか一つであるとよい。
また、負極活物質吸収層はアモルファスシリコンから成るとよい。 The carbon-based material may be any one of fibers made of carbon nanotubes, carbon fibers, and activated carbon.
The negative electrode active material absorption layer may be made of amorphous silicon.

本発明の二次電池用電極によれば、炭素系材料の表面に配置される負極活物質吸収層と炭素系材料との間に、炭素系材料と負極活物質吸収層との間の電子移動が可能な材料から成る中間層が配置されるため、炭素系材料と負極活物質吸収層との反応を防止することで電気抵抗値の増大を抑制するとともに、電池性能の低下を抑制する。   According to the secondary battery electrode of the present invention, the electron transfer between the carbon-based material and the negative electrode active material absorbing layer between the negative electrode active material absorbing layer and the carbon-based material disposed on the surface of the carbon-based material. Since an intermediate layer made of a material that can be used is disposed, the reaction between the carbon-based material and the negative electrode active material absorption layer is prevented, thereby suppressing an increase in electric resistance and suppressing a decrease in battery performance.

本発明の実施例に係る第１の二次電池用電極の模式断面図である。It is a schematic cross section of the 1st electrode for secondary batteries concerning the example of the present invention. 本発明の実施例に係る第２の二次電池用電極の模式断面図である。It is a schematic cross section of the 2nd electrode for secondary batteries concerning the example of the present invention. 本発明の実施例に係る二次電池用電極の製造方法を示す概略図である。It is the schematic which shows the manufacturing method of the electrode for secondary batteries which concerns on the Example of this invention.

［実施例］
本発明に係る二次電池用電極の実施例について、図１〜図３を用いて詳細に説明する。本実施例では、二次電池としてリチウムイオン電池を例として説明する。すなわち、本実施例に係る二次電池用電極１０は、リチウムイオン電池の負極として用いられる。 [Example]
The Example of the electrode for secondary batteries which concerns on this invention is described in detail using FIGS. 1-3. In this embodiment, a lithium ion battery will be described as an example of a secondary battery. That is, the secondary battery electrode 10 according to this example is used as a negative electrode of a lithium ion battery.

図１及び図２に示すように、本発明に係る二次電池用電極１０は、基板１と、基板１上に配置される炭素系材料２と、炭素系材料２の表面に配置されて負極活物質を吸収する材料から成る負極活物質吸収層３とを備え、炭素系材料２と負極活物質吸収層３との間に電子移動を可能とする材料から成る中間層４が配置されるものである。本実施例においては、一層で構成された中間層４を有する二次電池用電極１０Ａと、二層で構成された中間層４を有する二次電池用電極１０Ｂとをそれぞれ説明する。二次電池用電極１０Ａ及び二次電池用電極１０Ｂは、中間層の数以外は同一の構成であるため、同一の構成については、まとめて二次電池用電極１０として説明する。   As shown in FIGS. 1 and 2, the secondary battery electrode 10 according to the present invention includes a substrate 1, a carbon-based material 2 disposed on the substrate 1, and a negative electrode disposed on the surface of the carbon-based material 2. An anode active material absorbing layer 3 made of a material that absorbs the active material, and an intermediate layer 4 made of a material that enables electron transfer between the carbon-based material 2 and the anode active material absorbing layer 3 It is. In this embodiment, a secondary battery electrode 10A having an intermediate layer 4 composed of one layer and a secondary battery electrode 10B having an intermediate layer 4 composed of two layers will be described. Since the secondary battery electrode 10A and the secondary battery electrode 10B have the same configuration except for the number of intermediate layers, the same configuration will be collectively described as the secondary battery electrode 10.

基板１は、集電板として機能するため導電材料、なかでも金属材料から成る。金属材料としては、銅（Ｃｕ）、アルミ（Ａｌ）、チタン（Ｔｉ）、鉄（Ｆｅ）、マグネシウム（Ｍｇ）などが例示される。本実施例においては、チタンが選択される。   The substrate 1 functions as a current collector plate and is made of a conductive material, particularly a metal material. Examples of the metal material include copper (Cu), aluminum (Al), titanium (Ti), iron (Fe), magnesium (Mg), and the like. In this example, titanium is selected.

炭素系材料２としては、炭素系繊維、例えばカーボンナノチューブ、カーボンファイバー及び活性炭でできた繊維が挙げられるが、本実施例ではカーボンナノチューブを用いる。図１に示すように、複数の炭素系材料（カーボンナノチューブ）２は、充電量向上の観点から、基板（集電板）１に所定方向（より好ましくは垂直）に配向されているとよい。さらにカーボンナノチューブ２は集電板１に対して高い密度で複数配置されている。例えば、カーボンナノチューブ２の配置条件としては、太さ５ｎｍ〜１００ｎｍ、長さ１μｍ〜１０００μｍ、密度１０９本／ｃｍ２以上であることが好適である。 Examples of the carbon-based material 2 include carbon-based fibers such as carbon nanotubes, carbon fibers, and fibers made of activated carbon. In this embodiment, carbon nanotubes are used. As shown in FIG. 1, the plurality of carbon-based materials (carbon nanotubes) 2 are preferably oriented in a predetermined direction (more preferably perpendicular) to the substrate (current collector plate) 1 from the viewpoint of improving the charge amount. Further, a plurality of carbon nanotubes 2 are arranged at a high density with respect to the current collector plate 1. For example, the arrangement condition of the carbon nanotube 2, thickness 5 nm to 100 nm, it is preferable to set the length 1Myuemu～1000myuemu, density 10 nine / cm 2 or more.

負極活物質はリチウムイオン二次電池においては、リチウムイオン（以下、単にリチウムということがある。）であり充電時にはこのリチウムイオンを負極が吸収する。したがって、負極活物質吸収層３はリチウムを吸収し得る材料から成る。例えば、周期律表１４族の元素、すなわちカーボン（Ｃ）、シリコン（Ｓｉ）、ゲルマニウム（Ｇｅ）、錫（Ｓｎ）、鉛（Ｐｂ）、これらの合金、これらを含む合成材料が挙げられる。本実施例では、これらのうち最もリチウムの吸収量が多いシリコンが用いられる。さらに、負極活物質吸収層３は、非晶質及び結晶質のいずれの状態でも構わないが、本実施例では、充放電時に体積が増減することを考慮して、体積の増減に追従しやすい非晶質のもの（アモルファスシリコン）を用いる。なお、負極活物質吸収層３の厚みは、カーボンナノチューブ２の表面に形成されることを考慮すると、５ｎｍ〜１００ｎｍが好適な範囲である。   In the lithium ion secondary battery, the negative electrode active material is lithium ion (hereinafter sometimes simply referred to as lithium), and the negative electrode absorbs this lithium ion during charging. Therefore, the negative electrode active material absorption layer 3 is made of a material that can absorb lithium. For example, elements of group 14 of the periodic table, that is, carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), alloys thereof, and synthetic materials containing these can be given. In this embodiment, silicon having the largest lithium absorption amount is used. Furthermore, the negative electrode active material absorption layer 3 may be in any state of amorphous and crystalline, but in this embodiment, it is easy to follow the increase and decrease of the volume in consideration of the increase and decrease of the volume during charging and discharging. Amorphous material (amorphous silicon) is used. The thickness of the negative electrode active material absorption layer 3 is preferably in the range of 5 nm to 100 nm in consideration of being formed on the surface of the carbon nanotube 2.

中間層４は、炭素系材料２と負極活物質３との反応を抑制するために、上述のとおり炭素系材料２と負極活物質吸収層３との間に配置される。中間層４には、リチウムとの非反応性を有するとともに、両者間での電子の受け渡しを可能とする（すなわち導電性を有する）材料が適している。したがって、中間層４には、例えばチタン（Ｔｉ）、銅、ジルコニウム（Ｚｒ）、それらの炭化物、それらの酸化物、すなわちチタン、チタンカーバイド（ＴｉＣ）、チタニア（ＴｉＯ２）、銅、炭化銅（ＣｕＣ）、酸化銅（ＣｕＯ）、ジルコニウム、炭化ジルコニウム（ＺｒＣ）、ジルコニア（ＺｒＯ２）及びこれらを少なくとも二種以上組み合わせた材料を含む。これらのうち、本実施例においては、万一、炭素系材料２の炭素と中間層４の材料との反応物が形成されても導電性に影響しにくいものとして、基板１と同一の材料であるチタン（Ｔｉ）が選択される。また、中間層４が、結晶質の状態であれば高い導電性を、非晶質の状態であれば高い密着性を有することになる。いずれの性質を優先するかによって結晶質か否かを適宜決定すればよい。そして、中間層４は、炭素系材料２の全周囲を被覆するとともに集電板１に接触して形成されている。なお、中間層４の厚みはカーボンナノチューブ２の表面に形成することを考慮すると、１ｎｍ〜２０ｎｍが好適な範囲である。 The intermediate layer 4 is disposed between the carbon-based material 2 and the negative electrode active material absorbing layer 3 as described above in order to suppress the reaction between the carbon-based material 2 and the negative electrode active material 3. For the intermediate layer 4, a material that is non-reactive with lithium and that can transfer electrons between the two (that is, has conductivity) is suitable. Therefore, the intermediate layer 4 includes, for example, titanium (Ti), copper, zirconium (Zr), carbides thereof, oxides thereof, that is, titanium, titanium carbide (TiC), titania (TiO 2 ), copper, copper carbide ( CuC), copper oxide (CuO), zirconium, zirconium carbide (ZrC), zirconia (ZrO 2 ), and materials obtained by combining at least two of these. Among these, in the present embodiment, even if a reaction product of carbon of the carbon-based material 2 and the material of the intermediate layer 4 is formed, it is assumed that the conductivity is not easily affected. Some titanium (Ti) is selected. Further, if the intermediate layer 4 is in a crystalline state, it has high conductivity, and if it is in an amorphous state, it has high adhesion. Whether or not it is crystalline may be appropriately determined depending on which property is given priority. The intermediate layer 4 covers the entire periphery of the carbon-based material 2 and is formed in contact with the current collector plate 1. In consideration of the formation of the intermediate layer 4 on the surface of the carbon nanotube 2, 1 nm to 20 nm is a preferable range.

したがって、図１に示すように、本実施例に係る第１のリチウム電池用電極１０Ａは、チタン製集電板１と、チタン製集電板１上に配置されるカーボンナノチューブ２と、カーボンナノチューブ２の表面に配置されて負極活物質すなわちリチウムイオンを吸収するシリコンから成る負極活物質吸収層３とを備え、カーボンナノチューブ２と負極活物質吸収層３との間にチタン製の中間層４が配置されるものである。   Therefore, as shown in FIG. 1, the first lithium battery electrode 10 </ b> A according to this example includes a titanium current collector plate 1, a carbon nanotube 2 disposed on the titanium current collector plate 1, and a carbon nanotube. 2 and a negative electrode active material absorption layer 3 made of silicon that absorbs lithium ions, and an intermediate layer 4 made of titanium is interposed between the carbon nanotubes 2 and the negative electrode active material absorption layer 3. Is to be placed.

ところで、中間層４は、図２に示すように、中間層４をチタンの第１中間層４ａと、チタンカーバイドの第２中間層４ｂとの二層で構成することにより密着性が向上する。また、図２に示すように、炭素系材料２の表面には、炭素系材料２と親和性の高いチタンカーバイドの第２中間層４ｂが、第２中間層４ｂの表面にチタンの第１中間層４ａがそれぞれ配置されることが好ましい。   By the way, as shown in FIG. 2, the intermediate layer 4 is composed of two layers of a first intermediate layer 4a made of titanium and a second intermediate layer 4b made of titanium carbide. Further, as shown in FIG. 2, a second intermediate layer 4b of titanium carbide having high affinity with the carbon-based material 2 is formed on the surface of the carbon-based material 2, and a first intermediate layer of titanium is formed on the surface of the second intermediate layer 4b. The layers 4a are preferably arranged respectively.

したがって、図２に示すように、実施例に係る第２のリチウム電池用電極１０Ｂは、チタン製集電板１と、チタン製集電板１上に配置されるカーボンナノチューブ２と、カーボンナノチューブ２の表面に配置されて負極活物質すなわちリチウムイオンを吸収するシリコンから成る負極活物質吸収層３とを備え、カーボンナノチューブ２と負極活物質吸収層３との間に、炭素系材料２の表面にチタンカーバイド製の第２中間層４ｂが、第２中間層４ｂの表面にチタン製の第１中間層４ａがそれぞれ配置されるものである。   Accordingly, as shown in FIG. 2, the second lithium battery electrode 10 </ b> B according to the example includes a titanium current collector plate 1, a carbon nanotube 2 disposed on the titanium current collector plate 1, and a carbon nanotube 2. And a negative electrode active material absorption layer 3 made of silicon that absorbs lithium ions, and is disposed on the surface of the carbon-based material 2 between the carbon nanotubes 2 and the negative electrode active material absorption layer 3. The second intermediate layer 4b made of titanium carbide is arranged with the first intermediate layer 4a made of titanium on the surface of the second intermediate layer 4b.

本発明に係る二次電池用電極１０によれば、炭素系材料２の表面に配置される負極活物質吸収層３と炭素系材料２との間に、炭素系材料２と負極活物質吸収層３との間の電子移動が可能な材料から成る中間層４が配置されるため、炭素系材料２と負極活物質吸収層３との反応を防止することで電気抵抗値の増大を抑制するとともに、電池性能の低下を抑制する。   According to the secondary battery electrode 10 of the present invention, the carbon-based material 2 and the negative electrode active material absorbing layer are disposed between the carbon-based material 2 and the negative-electrode active material absorbing layer 3 disposed on the surface of the carbon-based material 2. Since the intermediate layer 4 made of a material capable of transferring electrons between the carbon material 3 and the negative electrode active material absorption layer 3 is prevented, an increase in the electric resistance value is suppressed. Suppresses battery performance degradation.

また、中間層４に負極活物質吸収層３と炭素系材料２との間に、炭素系材料２と負極活物質吸収層３との間の電子移動が可能な材料（チタン）を用いることによって、導電性を低下させることなく負極活物質吸収層３の炭素系材料２への密着性を高めることができる。   Further, by using a material (titanium) capable of electron transfer between the carbon-based material 2 and the negative electrode active material absorbing layer 3 between the negative electrode active material absorbing layer 3 and the carbon-based material 2 for the intermediate layer 4. In addition, the adhesion of the negative electrode active material absorption layer 3 to the carbon-based material 2 can be improved without reducing the conductivity.

さらに、負極活物質吸収層３にアモルファスシリコンを用いた場合には、リチウム吸収時（充電時）の負極活物質吸収層３の体積膨張による負極活物質吸収層３の破壊を抑制するとともに、負極活物質吸収層３内へのリチウムの吸収を容易にすることもできる。   Further, when amorphous silicon is used for the negative electrode active material absorption layer 3, the negative electrode active material absorption layer 3 is prevented from being destroyed due to volume expansion of the negative electrode active material absorption layer 3 during lithium absorption (at the time of charging), and the negative electrode The absorption of lithium into the active material absorption layer 3 can also be facilitated.

なお、集電板１と同一材料を用いて中間層４を炭素系材料２の全周囲に被覆させるとともに集電板１に接触させて形成したことによって、導電性が向上する。
以下、本実施例に係る二次電池用電極１０（１０Ａ，１０Ｂ）の製造方法について、図３を用いて説明する。 The intermediate layer 4 is coated on the entire periphery of the carbon-based material 2 using the same material as the current collector plate 1 and is formed in contact with the current collector plate 1, thereby improving conductivity.
Hereinafter, a method for manufacturing the secondary battery electrode 10 (10A, 10B) according to this example will be described with reference to FIG.

本実施例の二次電池用電極１０の製造方法は、炭素系材料２を形成する炭素系材料形成工程と、形成した炭素系材料を集電板１へ配置する炭素系材料配置（転写）工程と、集電板１に配置された炭素系材料の周囲に中間層４を配置する中間層配置（形成）工程と、形成された中間層４上に負極活物質吸収層３を配置する負極活物質吸収層配置（形成）工程とを備える。   The manufacturing method of the electrode 10 for secondary batteries of a present Example is the carbon-type material formation process which forms the carbon-type material 2, and the carbon-type material arrangement | positioning (transfer) process which arrange | positions the formed carbon-type material to the current collecting plate 1. An intermediate layer disposing (forming) step of disposing the intermediate layer 4 around the carbon-based material disposed on the current collector plate 1; and a negative electrode active material for disposing the negative electrode active material absorbing layer 3 on the formed intermediate layer 4 A substance absorption layer arrangement (formation) step.

まず、炭素系材料形成工程について説明する。炭素系材料２の形成は、選択される炭素系材料２において公知の製法を用いればよい。本実施例においては、炭素系材料２はカーボンナノチューブであるため、例えばアーク放電法や、レーザ蒸発法、熱化学気相成長法が挙げられる。本実施例においては、図３（ａ）に示すように、熱化学気相成長法によって、カーボンナノチューブ２が生成用基板２０上に生成される。   First, the carbon-based material forming process will be described. The carbon-based material 2 may be formed by using a known manufacturing method for the selected carbon-based material 2. In this embodiment, since the carbon-based material 2 is a carbon nanotube, for example, an arc discharge method, a laser evaporation method, and a thermal chemical vapor deposition method can be used. In this embodiment, as shown in FIG. 3A, the carbon nanotubes 2 are generated on the generation substrate 20 by thermal chemical vapor deposition.

次に、炭素系材料配置（転写）工程について説明する。形成した炭素系材料（カーボンナノチューブ）２は、集電板１へ配置される。集電板１への配置は公知の方法を用いればよい。実施例１においては、例えば、生成用基板２０上に生成されたカーボンナノチューブ２を生成用基板２０から剥離して集電板（チタン製基板）１へ転写する方法が挙げられる。すなわち、実施例１においては、図３（ｂ）に示すように、カーボンナノチューブ２を、生成用基板２０からカッター、ガスやレーザ等で剥離するとともに、集電板１へ移し替えて配置（固定）する。   Next, a carbon-based material arrangement (transfer) process will be described. The formed carbon-based material (carbon nanotube) 2 is disposed on the current collector plate 1. A known method may be used for the arrangement on the current collector plate 1. In Example 1, for example, there is a method in which the carbon nanotubes 2 generated on the generation substrate 20 are peeled off from the generation substrate 20 and transferred to the current collector plate (titanium substrate) 1. That is, in Example 1, as shown in FIG. 3B, the carbon nanotubes 2 are peeled off from the generation substrate 20 with a cutter, gas, laser, or the like, and transferred to the current collector plate 1 to be arranged (fixed). )

次に、中間層配置（形成）工程について説明する。集電板１に転写した炭素系材料２の全周囲を被覆し、かつ集電板１に接触するように中間層４を形成する。すなわち、炭素系材料２の周囲に、中間層４に用いられる材料を蒸着、スパッタリング、化学気相成長法、物理気相成長法、ＶＬＳ（Ｖａｐｏｒ−Ｌｉｑｕｉｄ−Ｓｏｌｉｄ）法などの公知の薄膜生成技術を用いて均一にコーティングする。図３（ｃ）には蒸着を用いた場合を示す。   Next, the intermediate layer arrangement (formation) step will be described. The intermediate layer 4 is formed so as to cover the entire circumference of the carbon-based material 2 transferred to the current collector plate 1 and to be in contact with the current collector plate 1. That is, a known thin film forming technique such as vapor deposition, sputtering, chemical vapor deposition, physical vapor deposition, VLS (Vapor-Liquid-Solid), etc., is used around the carbon-based material 2 to deposit the material used for the intermediate layer 4. Use to coat uniformly. FIG. 3C shows a case where vapor deposition is used.

ここで、図２に示す第２の二次電池用電極１０Ｂを製造する場合、すなわち中間層４が第１中間層４ａと第２中間層４ｂとを備える場合には、中間層配置工程は第１中間層配置工程と第２中間層配置工程とを具備する。すなわち、集電板１に形成された炭素系材料２の全周囲を被覆し、かつ集電板１に接触するように、第１中間層４ａに用いられる材料を、第１中間層４ａ上に第２中間層４ｂに用いられる材料を、それぞれ上記の公知の薄膜生成技術を用いて均一にコーティングする。   Here, when the second secondary battery electrode 10B shown in FIG. 2 is manufactured, that is, when the intermediate layer 4 includes the first intermediate layer 4a and the second intermediate layer 4b, the intermediate layer disposing step is performed as follows. 1 intermediate | middle layer arrangement | positioning process and 2nd intermediate | middle layer arrangement | positioning process are comprised. That is, the material used for the first intermediate layer 4a is coated on the first intermediate layer 4a so as to cover the entire periphery of the carbon-based material 2 formed on the current collector plate 1 and to be in contact with the current collector plate 1. The materials used for the second intermediate layer 4b are uniformly coated using the above-described known thin film generation techniques.

最後に、負極活物質吸収層配置（形成）工程について説明する。中間層４が形成された炭素系材料２に、中間層４の上に負極活物質吸収層３を形成（配置）する。すなわち、炭素系材料２の周囲に、負極活物質吸収材料を蒸着、スパッタリング、化学気相成長法、物理気相成長法、ＶＬＳ法などの公知の薄膜生成技術を用いて均一にコーティングする。図３（ｄ）には蒸着を用いた場合を示す。これらのうち蒸着などの材料を気化して負極活物質吸収層３を形成する場合には、その温度が中間層４の材料が気化しない温度範囲で行うことが好ましい。本実施例においては、チタンが気化しない１３００℃程度以下で且つシリコンが気化する１１００℃以上（１１００℃〜１３００℃）が好適な温度範囲である。   Finally, the negative electrode active material absorption layer arrangement (formation) step will be described. The negative electrode active material absorption layer 3 is formed (arranged) on the intermediate layer 4 in the carbon-based material 2 on which the intermediate layer 4 is formed. That is, the negative electrode active material absorbing material is uniformly coated around the carbon-based material 2 using a known thin film forming technique such as vapor deposition, sputtering, chemical vapor deposition, physical vapor deposition, or VLS. FIG. 3D shows a case where vapor deposition is used. Of these, when the material for vapor deposition or the like is vaporized to form the negative electrode active material absorbing layer 3, it is preferable that the temperature be within a temperature range in which the material for the intermediate layer 4 is not vaporized. In this embodiment, the temperature range is preferably about 1300 ° C. or less at which titanium is not vaporized and 1100 ° C. or higher (1100 ° C. to 1300 ° C.) at which silicon is vaporized.

なお、本実施例のように炭素系材料２としてカーボンナノチューブを用いる場合には、付加的に、炭素系材料配置工程の前に、その先端を開端することや、炭素系材料配置工程の後にカーボンナノチューブ内部に残った触媒金属を除去することなどを行ってもよい。   In addition, when using a carbon nanotube as the carbon-based material 2 as in the present embodiment, in addition, the front end of the carbon-based material is opened before the carbon-based material arranging step, or after the carbon-based material arranging step. For example, the catalyst metal remaining inside the nanotube may be removed.

本実施例の二次電池用電極１０の製造方法によれば、炭素系材料２の表面に配置される負極活物質吸収層３と炭素系材料２との間に、炭素系材料２と負極活物質吸収層３との間の電子移動が可能な材料から成る中間層４を配置するため、導電性を低下させることなく負極活物質吸収層３の炭素系材料２への密着性を高めることができる。   According to the method for manufacturing the secondary battery electrode 10 of the present embodiment, the carbon-based material 2 and the negative electrode active material are disposed between the carbon-based material 2 and the negative-electrode active material absorbing layer 3 disposed on the surface of the carbon-based material 2. Since the intermediate layer 4 made of a material capable of transferring electrons to and from the material absorption layer 3 is disposed, the adhesion of the negative electrode active material absorption layer 3 to the carbon-based material 2 can be improved without reducing the conductivity. it can.

さらに、負極活物質吸収層３にアモルファスシリコンを用いた場合には、リチウム吸収時（充電時）の負極活物質吸収層３の体積膨張による負極活物質吸収層３の破壊を抑制するとともに、負極活物質吸収層３内へのリチウムの吸収を容易にすることもできる。   Further, when amorphous silicon is used for the negative electrode active material absorption layer 3, the negative electrode active material absorption layer 3 is prevented from being destroyed due to volume expansion of the negative electrode active material absorption layer 3 during lithium absorption (at the time of charging), and the negative electrode The absorption of lithium into the active material absorption layer 3 can also be facilitated.

なお、中間層４が集電板１と同一材料であるとともに集電板１に接触させて形成したことによって、中間層４をコーティングする上で利便性がある。
したがって、得られた二次電池用電極１０は、炭素系材料２と負極活物質吸収層３との反応を防止することで電気抵抗値の増大を抑制するとともに、電池性能の低下を抑制する。 The intermediate layer 4 is made of the same material as the current collector plate 1 and is formed in contact with the current collector plate 1, which is convenient for coating the intermediate layer 4.
Therefore, the obtained secondary battery electrode 10 prevents the reaction between the carbon-based material 2 and the negative electrode active material absorption layer 3, thereby suppressing an increase in electric resistance and suppressing a decrease in battery performance.

１ 基板（集電板）
２ 炭素系材料（カーボンナノチューブ）
３ 負極活物質吸収層
４ 中間層
４ａ 第１中間層
４ｂ 第２中間層
１０（１０Ａ，１０Ｂ） 二次電池用電極 1 Substrate (collector plate)
2 Carbon materials (carbon nanotubes)
3 Negative electrode active material absorption layer 4 Intermediate layer 4a First intermediate layer 4b Second intermediate layer 10 (10A, 10B) Secondary battery electrode

Claims (6)

基板と、当該基板上に配置される炭素系材料と、当該炭素系材料の表面に配置されて負極活物質を吸収する材料から成る負極活物質吸収層とから成る二次電池用電極において、
前記炭素系材料と前記負極活物質吸収層との間に、前記炭素系材料と前記負極活物質吸収層との間での電子移動を可能とする材料から成る中間層が配置されることを特徴とする二次電池用電極。 In an electrode for a secondary battery comprising a substrate, a carbon-based material disposed on the substrate, and a negative electrode active material absorption layer made of a material that is disposed on the surface of the carbon-based material and absorbs the negative electrode active material,
An intermediate layer made of a material that enables electron transfer between the carbon-based material and the negative electrode active material absorption layer is disposed between the carbon-based material and the negative electrode active material absorption layer. An electrode for a secondary battery. 中間層は、チタン、銅、ジルコニウム、それらの酸化物、それらの炭化物、又はこれらを少なくとも二種以上組み合わせた材料から成ることを特徴とする請求項１に記載の二次電池用電極。   2. The electrode for a secondary battery according to claim 1, wherein the intermediate layer is made of titanium, copper, zirconium, oxides thereof, carbides thereof, or a combination of at least two of these materials. 中間層は、チタンの第１中間層と、チタンカーバイドの第２中間層とで構成されることを特徴とする請求項１に記載の二次電池用電極。   The secondary battery electrode according to claim 1, wherein the intermediate layer includes a first intermediate layer of titanium and a second intermediate layer of titanium carbide. 炭素系材料の表面に第２中間層が、当該第２中間層の表面に第１中間層がそれぞれ配置されることを特徴とする請求項３に記載の二次電池用電極。   The secondary battery electrode according to claim 3, wherein the second intermediate layer is disposed on the surface of the carbon-based material, and the first intermediate layer is disposed on the surface of the second intermediate layer. 炭素系材料は、カーボンナノチューブ、カーボンファイバー及び活性炭でできた繊維のうちのいずれか一つであることを特徴とする請求項１乃至４のいずれか一項に記載の二次電池用電極。   The electrode for a secondary battery according to any one of claims 1 to 4, wherein the carbon-based material is any one of carbon nanotubes, carbon fibers, and fibers made of activated carbon. 負極活物質吸収層はアモルファスシリコンから成ることを特徴とする請求項１乃至５のいずれか一項に記載の二次電池用電極。   The secondary battery electrode according to any one of claims 1 to 5, wherein the negative electrode active material absorption layer is made of amorphous silicon.
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