JP2012227107A - Electrode body for nonaqueous electrolyte battery and nonaqueous electrolyte battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: an electrode body for a nonaqueous electrolyte battery, capable of preventing a binder in an active material layer from being agglutinated and forming an active material layer small in internal resistance; and a nonaqueous electrolyte battery manufactured using the electrode body.SOLUTION: In an electrode body for a nonaqueous electrolyte battery, an active material layer is formed on a collector. The active material layer contains active material powder, powder of a sulfide-based solid electrolyte, and a binder. The binder is a copolymer of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF). Since the binder is a copolymer of PTFE and PVDF, the binder is excellent in both heat resistance and dispersibility. Therefore, the binder is prevented from being agglutinated in the active material layer, internal resistance can be reduced, and the active material layer can be hot pressed without no trouble. Accordingly, an active material layer with high strength can be obtained.

Description

  The present invention relates to an electrode body suitable for a non-aqueous electrolyte battery used for a power source of an electric device or the like, and a non-aqueous electrolyte battery using the electrode body.

  Nonaqueous electrolyte batteries are used as power sources for relatively small electric devices such as portable devices. Typical examples of the nonaqueous electrolyte battery include a lithium battery and a lithium ion secondary battery (hereinafter simply referred to as a lithium ion battery) using a lithium ion transfer reaction between the positive and negative electrode bodies.

  This lithium ion battery includes a positive electrode body, a negative electrode body, and an electrolyte layer disposed between these electrode bodies. Each electrode body further includes a current collector having a current collecting function and an active material layer containing an active material. And it is a secondary battery of the system which performs charging / discharging by lithium (Li) ion moving through an electrolyte layer between a positive electrode body and a negative electrode body. In recent years, an all-solid-state battery using an inorganic solid electrolyte instead of an organic electrolyte has been proposed (see, for example, Patent Document 1).

  Patent Document 1 discloses a positive electrode layer (positive electrode active material layer) including a positive electrode active material and an electrolyte, and a binder is contained in the positive electrode layer so that the active materials are not in contact with each other, other than the active material and the active material. It is described that these substances (electrolyte particles and conductive assistant) are bound. As this binder, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), and the like are disclosed.

JP 2009-152077 A

  However, when a binder is contained in the active material layer, if PTFE is used as the binder, PTFE aggregates due to low dispersibility, and this agglomerated portion becomes an internal resistance and causes ionic conduction and electronic conduction. This may hinder the path and reduce the battery characteristics. On the other hand, when PVDF is used as the binder, when hot press molding the active material layer, PVDF has low heat resistance, and thus there is a risk of being restricted by the temperature during hot pressing.

  The present invention has been made in view of the above circumstances, and one of its purposes is a nonaqueous electrolyte capable of preventing the aggregation of the binder in the active material layer and forming an active material layer having a low internal resistance. The object is to provide an electrode body for a battery. Another object of the present invention is to provide a nonaqueous electrolyte battery using the electrode body for a nonaqueous electrolyte battery of the present invention.

  The present invention achieves the above object by specifying the constituent material of a binder (binder) and its chemical structure.

  (1) The electrode body for a nonaqueous electrolyte battery according to the present invention is a nonaqueous electrolyte battery electrode body in which an active material layer is formed on a current collector, and the active material layer includes an active material powder and sulfide. It contains a powder of a physical solid electrolyte and a binder. The binder is a copolymer of polytetrafluoroethylene and polyvinylidene fluoride.

  According to this configuration, since the binder is a copolymer of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), each advantage of PTFE and PVDF can be extracted in a balanced manner. Since PTFE is excellent in heat resistance and PVDF is excellent in dispersibility, a binder obtained by copolymerizing both can have an effect of being excellent in heat resistance and dispersibility. Accordingly, it is possible to prevent local dispersibility reduction due to PTFE and PVDF deterioration due to PVDF in the electrode body, and the heat resistance and dispersibility are excellent over the entire electrode body. By copolymerizing PTFE and PVDF, the binder can be prevented from agglomerating in the active material layer, the internal resistance can be reduced, and a sufficient path for ion conduction and electron conduction can be secured. Moreover, there are few temperature restrictions at the time of hot press-molding the active material layer, and the constituent materials in the active material layer can be firmly bound to each other.

  In the present invention, since the active material layer includes the active material powder and the sulfide-based solid electrolyte powder, the active material layer has a structure in which the sulfide-based solid electrolyte exists around the active material particles. ing. Since this sulfide-based solid electrolyte mediates the conduction of ions in the active material layer, the exchange of ions can be performed stably. A sulfide-based solid electrolyte is preferable because it generally exhibits higher ionic conductivity than an oxide-based solid electrolyte. Although the active material layer includes a sulfide-based solid electrolyte, the binder does not react with the sulfide-based material, and thus aggregation in the active material layer can be prevented.

  The electrode body for a nonaqueous electrolyte battery according to the present invention is formed by pressing a powdered material (including an active material powder and a sulfide solid electrolyte powder) to form an active material layer. Since it contains excellent deformability, it is difficult for the active material layer to crack or crack. Moreover, the strength of the active material layer is also increased by the binding effect between the powdery materials.

  (2) As one form of the electrode body for nonaqueous electrolyte batteries of this invention, the copolymerization ratio of the said polytetrafluoroethylene and polyvinylidene fluoride is 10: 90-40: 60.

  In a copolymer of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), if the polymerization ratio of PTFE in the copolymer is reduced, heat resistance may be lowered. On the other hand, if the polymerization ratio of PTFE in the copolymer is too large, the polymerization ratio of PVDF is relatively decreased, which may cause a decrease in dispersibility. Therefore, the preferable copolymerization ratio of PTFE and PVDF in the copolymer is 10:90 to 40:60, and more preferably 25:75 to 35:65.

  (3) As one form of the electrode body for nonaqueous electrolyte batteries of this invention, the mixing ratio of the said active material powder and the sulfide type solid electrolyte powder is 80: 20-40: 60 by volume ratio. Is mentioned.

  If the ratio of the active material to the entire active material layer is reduced, the battery capacity may be reduced. On the other hand, if the ratio of the active material to the entire active material layer becomes too large, the ratio of the sulfide-based solid electrolyte decreases relatively, making it difficult to mediate the conduction of ions in the active material layer and increasing the internal resistance. There is a risk of inviting. Therefore, a preferable mixing ratio of each powder of the active material and the sulfide-based solid electrolyte in the active material layer is 80:20 to 40:60 by volume ratio, and more preferably 70:30 to 60:40 by volume ratio. It is.

  (4) The non-aqueous electrolyte battery of the present invention is a non-aqueous electrolyte battery comprising a positive electrode body, a negative electrode body, and a solid electrolyte layer disposed between both electrode bodies. The electrode body for a nonaqueous electrolyte battery according to the present invention is used for at least one of them.

  If it is a nonaqueous electrolyte battery provided with the said structure, it is excellent in a battery characteristic. This is because, as described in the description of the electrode body for a non-aqueous electrolyte battery, the electrode body to be used can prevent the binder from aggregating in the active material layer, and can reduce the internal resistance. This is because a sufficient path for conduction and electron conduction can be secured.

  (5) As one form of the nonaqueous electrolyte battery of this invention, it is mentioned that the said solid electrolyte layer contains sulfide type solid electrolyte.

  As described above, sulfide-based solid electrolytes are preferable because they generally exhibit higher lithium ion conductivity than oxide-based ones.

  In the electrode body for a non-aqueous electrolyte battery of the present invention, since the binder is a copolymer of PTFE and PVDF in the active material layer, the binder is agglomerated in the active material layer because it is excellent in heat resistance and dispersibility. And the internal resistance can be reduced. Moreover, there are few temperature restrictions at the time of hot pressing an active material layer, an active material layer can be hot press-molded without trouble, and a high-strength active material layer can be obtained.

  Since the nonaqueous electrolyte battery of the present invention uses the electrode body for a nonaqueous electrolyte battery of the present invention, the battery characteristics are excellent.

It is a SEM photograph of the electrode body in an Example, (1-1) is sample No.2. No. 1 positive electrode body (1-2) is sample No. No. 1 negative electrode body, (2-1) is Sample No. No. 2 positive electrode body, (2-2) is Sample No. 2 negative electrode body, (3-1) is the sample No. 3 and (3-2) are sample Nos. 3 is a negative electrode body.

  Hereinafter, embodiments of the electrode body for a nonaqueous electrolyte battery of the present invention will be described. The electrode body of the present invention can be used as a positive electrode body or a negative electrode body of a nonaqueous electrolyte battery (lithium ion battery). The nonaqueous electrolyte battery includes a positive electrode body, a negative electrode body, and a solid electrolyte layer (SE layer). The positive electrode body further includes a positive electrode current collector and a positive electrode active material layer, and the negative electrode body is a negative electrode. A current collector and a negative electrode active material layer are provided. And it functions as a battery by exchanging Li ion between a positive electrode body and a negative electrode body. Hereinafter, each configuration of the nonaqueous electrolyte battery will be described in detail. In this example, the electrode body of the present invention is used as a positive electrode body.

[Positive electrode body]
(Positive electrode current collector)
The substrate serving as the positive electrode current collector may be composed of only a conductive material, or may be composed of a conductive material film formed on an insulating substrate. In the latter case, the conductive material functions as a current collector. As the conductive material, one selected from Al, Ni, alloys thereof, and stainless steel can be suitably used.

(Positive electrode active material layer)
The positive electrode active material layer is a layer obtained by pressure forming a mixed powder containing positive electrode active material particles, sulfide-based solid electrolyte particles, and a binder. The positive electrode active material particles are composed of a positive electrode active material that is a main component of the battery reaction. As the positive electrode active material, a material having a layered rock salt type crystal structure, for example, Liα _X β _(1-X) O ₂ (α is one selected from Co, Ni, Mn, β is Fe, Al, Ti , Cr, Zn, Mo, Bi, Co, Ni, and Mn, α ≠ β, and X is 0.5 or more). Specific examples thereof include LiCoO ₂ , LiNiO ₂ , LiMnO ₂ , LiNi _0.5 Mn _0.5 O ₂ , LiCo _0.5 Fe _0.5 O ₂ , LiCo _0.5 Al _0.5 O ₂ , LiNi _{1. / 3} Mn _1/3 Co _1/3 O ₂ , LiNi _0.8 Co _0.15 Al _0.05 O _{2 and the} like. In addition, as a positive electrode active material, a substance having a spinel crystal structure (for example, LiMn ₂ O ₄ or the like) or a substance having an olivine crystal structure (for example, Li _X FePO ₄ (0 <X <1)) is used. It can also be used. A preferable average particle diameter of the positive electrode active material particles is 0.1 to 20 μm.

The sulfide-based solid electrolyte particles are composed of a sulfide-based solid electrolyte having high ion conductivity, and are necessary for mediating ion conduction in the positive electrode active material layer. Examples of the sulfide-based solid electrolyte include Li ₂ S—P ₂ S ₅ system, Li ₂ S—SiS ₂ system, Li ₂ S—B ₂ S ₃ system, and further P ₂ O ₅ and Li ₃ PO _4. May be added. A preferable average particle diameter of the sulfide-based solid electrolyte particles is 0.1 to 10 μm.

  Each mixing ratio of the positive electrode active material particles and the sulfide-based solid electrolyte particles in the positive electrode active material layer can be appropriately selected. However, if the ratio of the positive electrode active material particles to the entire positive electrode active material layer is reduced, the battery capacity may be reduced. On the other hand, if the ratio of the positive electrode active material particles to the entire positive electrode active material layer is too large, the ratio of the sulfide-based solid electrolyte particles is relatively small, and it is difficult to mediate ion conduction in the positive electrode active material layer. There is a risk of increasing internal resistance. Therefore, the preferable mixing ratio of the positive electrode active material particles and the sulfide-based solid electrolyte particles in the positive electrode active material layer is 80:20 to 40:60 by volume ratio, more preferably 70:30 to 60: by volume ratio. 40.

  The binder is composed of a copolymer of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), and is necessary for hot press-molding the positive electrode active material layer as described later. As a polymerization method for forming a copolymer of PTFE and PVDF, various conventionally known polymerization methods can be employed. Examples of this polymerization method include an emulsion polymerization method, a suspension polymerization method, a bulk polymerization method, and a solution polymerization method. For polymerization, various conventionally known polymerization initiators, polymerization catalysts, and the like can be used. Various additives such as a solvent, a dispersion medium, a dispersion stabilizer, and an emulsifier can be used depending on the polymerization method. In the copolymer of PTFE and PVDF, when the polymerization rate of PTFE in the copolymer is decreased, there is a risk of causing a decrease in heat resistance, while on the other hand, when the polymerization rate of PTFE in the copolymer is excessively increased, There is a possibility that the polymerization ratio of PVDF is relatively reduced and the dispersibility is lowered. Therefore, the copolymerization ratio of PTFE and PVDF is preferably 10:90 to 40:60, and more preferably 25:75 to 35:65. The binder of the above copolymerization ratio is excellent in dispersibility and heat resistance, and does not react with the sulfide system, thus preventing the binder from aggregating in the positive electrode active material layer, reducing internal resistance, and There are few temperature restrictions when hot-pressing the positive electrode active material layer, and it is possible to hot press-mold the positive electrode active material layer without hindrance. This copolymerization ratio is determined by the mixing ratio when the PTFE and PVDF powders are mixed in the polymerization method. A preferable average particle size of the copolymer particles obtained by copolymerizing PTFE and PVDF is 10 to 100 μm.

  When the ratio of the binder to the whole positive electrode active material layer increases, the ratio of the positive electrode active material and the sulfide-based solid electrolyte relatively decreases, which may cause internal resistance in the positive electrode active material layer. On the other hand, when the ratio of the binder with respect to the whole positive electrode active material layer is too small, there is a possibility that cracking or cracking may occur when the positive electrode active material layer is hot press-molded, leading to a decrease in strength. Therefore, it is preferable that the mixing ratio of the binder with respect to the whole positive electrode active material layer is 3 to 15 vol%.

  The positive electrode active material layer may contain a conductive additive, if necessary, in addition to the mixed powder of the positive electrode active material particles, the sulfide-based solid electrolyte particles, and the binder. Examples of the conductive assistant include carbon black such as acetylene black (AB) and ketjen black (KB).

  As a method of forming the positive electrode body, a method of hot press molding can be mentioned. First, a constituent material for the positive electrode active material layer (including a positive electrode active material, a sulfide-based solid electrolyte, and a copolymer of PTFE and PVDF) is mixed with a ball mill or the like to prepare a positive electrode mixture. Next, after placing the positive electrode current collector in a mold and filling the positive electrode mixture from above, it is hot press-molded at a press pressure of 300 to 800 MPa and a press temperature of 100 to 220 ° C. In addition, after the positive electrode active material layer is pressure-molded, the positive electrode current collector may be bonded to form a positive electrode body.

[Negative electrode body]
(Negative electrode current collector)
The substrate serving as the negative electrode current collector may be composed of only a conductive material, or may be composed of a conductive material film formed on an insulating substrate. In the latter case, the conductive material functions as a current collector. As the conductive material, for example, one selected from Cu, Ni, Fe, Cr and alloys thereof (for example, stainless steel) can be suitably used.

(Negative electrode active material layer)
The negative electrode active material layer is composed of a negative electrode active material that is a main component of the battery reaction. As the negative electrode active material, in addition to metal Li (single Li metal) or Li alloy (alloy composed of Li metal and an additive element), C, Si, Ge, Sn, Al, Li alloy, Li ₄ Ti ₅ O ₁₂ or the like An oxide containing Li can be used.

When the negative electrode active material layer is a powder molded body made of powdered negative electrode active material particles, the negative electrode active material layer contains solid electrolyte particles that mediate ion conduction and improve ion conductivity in the active material layer. Also good. As solid electrolyte particles, sulfide systems such as Li ₂ S—P ₂ S ₅ can be suitably used. In addition, you may contain a conductive support agent and a binder as needed.

  The negative electrode body can be formed using the same method as that for the positive electrode body when the negative electrode active material layer is a powder molded body made of powdered negative electrode active material particles. In addition, when forming a negative electrode active material layer, the metal foil may be formed on a solid electrolyte layer described later and adhered to the solid electrolyte layer by pressing or an electrochemical technique.

[Solid electrolyte layer]
The solid electrolyte layer (SE layer) is composed of a solid electrolyte, and is preferably composed of a sulfide-based solid electrolyte with high ion conductivity. Examples of the sulfide solid electrolyte include Li ₂ S—P ₂ S ₅ system, Li ₂ S—SiS ₂ system, Li ₂ S—B ₂ S ₃ system, and further P ₂ O ₅ and Li ₃ PO _4. It may be added. The same material as the sulfide-based solid electrolyte particles that are constituent materials of the positive electrode active material layer may be used. In addition, you may comprise with oxide type solid electrolytes, such as LiPON.

[Others]
(Middle layer)
Depending on the material of the positive electrode active material layer and the SE layer, an intermediate layer may be provided between the positive electrode active material layer and the SE layer. The intermediate layer is required when an oxide is used for the positive electrode active material and a solid sulfide system is used for the SE layer, and suppresses an increase in resistance between the positive electrode active material layer and the SE layer. Is a layer. The sulfide-based solid electrolyte contained in the SE layer and the oxide-based positive electrode active material contained in the positive electrode active material layer may react to form a high resistance layer. By providing the intermediate layer, the formation of the high resistance layer can be suppressed, and the decrease in the discharge capacity of the battery due to charge / discharge can be suppressed. As a material used for the intermediate layer, an amorphous Li ion conductive oxide such as LiNbO ₃ or LiTaO ₃ can be used. In particular, LiNbO ₃ can effectively suppress an increase in resistance near the interface between the positive electrode active material layer and the SE layer.

(Interface layer)
The interface layer is a layer that plays a role of ensuring the bonding between the negative electrode active material layer and the SE layer. As a material for the interface layer, a group 14 element (particularly, Si) of the periodic table can be used. When the interface layer is substantially composed of Si, a battery having excellent discharge characteristics can be obtained.

[Test example]
A non-aqueous electrolyte battery (lithium ion battery) of the present invention was produced and its battery performance was evaluated.

[Nonaqueous Electrolyte Battery of Example]
LiCoO ₂ powder (volume distribution center particle diameter D50 = 10 μm), Li ₂ S—P ₂ S ₅ based solid electrolyte powder (D50 = 5 μm), binder (D50 = 40 μm), and acetylene black (D50 = 10 μm). The positive electrode mixture was prepared by mixing with a ball mill at a volume ratio of 44: 47: 6: 3 at 50 rpm for 4 hours. As the binder, a copolymer of PTFE and PVDF was used. The copolymerization ratio of PTFE and PVDF is 30:70. An Al foil (thickness 20 μm) serving as a positive electrode current collector is placed in a mold, and a positive electrode mixture is filled thereon, and this is hot-pressed for 10 minutes at a press pressure of 360 MPa and a press temperature of 200 ° C. By doing so, a positive electrode body (30 mm × 40 mm) in which a positive electrode active material layer (formed body of LiCoO ₂ + Li ₂ S—P ₂ S ₅ solid electrolyte) was formed on the positive electrode current collector (Al foil). It is formed. The thickness of the positive electrode active material layer in this positive electrode body was 60 μm.

Graphite powder (volume distribution center particle diameter D50 = 10 μm), Li ₂ S—P ₂ S ₅ based solid electrolyte powder (D50 = 5 μm) and binder (D50 = 40 μm) in a volume ratio of 49: 45: 6 The negative electrode mixture was prepared by mixing with a ball mill at a rate of 50 rpm for 4 hours. As the binder, a copolymer of PTFE and PVDF was used. The copolymerization ratio of PTFE and PVDF is 30:70. A stainless steel foil (thickness 10 μm) serving as a negative electrode current collector is placed in a mold and filled with a negative electrode mixture, which is hot-pressed for 10 minutes at a press pressure of 360 MPa and a press temperature of 200 ° C. By doing so, a negative electrode body (30 mm × 40 mm) in which a negative electrode active material layer (graphite + Li ₂ S—P ₂ S ₅ solid electrolyte formed body) was formed on the negative electrode current collector (stainless foil) was formed. Is done. The thickness of the negative electrode active material layer in this negative electrode body was 60 μm.

Next, a Li ₂ SP—P ₂ S ₅ solid electrolyte is formed on the positive electrode active material layer of the positive electrode body and on the negative electrode active material layer of the negative electrode body using a PLD (pulse laser deposition) method, respectively. The positive electrode side solid electrolyte layer (thickness 5 μm) and the negative electrode side solid electrolyte layer (thickness 5 μm) were formed. At this time, an interface layer (thickness: 0.02 μm) made of Si was formed between the negative electrode active material layer and the negative electrode side solid electrolyte layer.

  And by laminating both electrode bodies so that the solid electrolyte layers formed on the positive electrode body and the negative electrode body face each other, pressurizing with a pressure of 16 MPa in the laminating direction, and holding at a temperature of 190 ° C. for 130 minutes, The solid electrolyte layers were fused together, and both electrode bodies were joined to produce a lithium ion battery.

  The lithium ion battery fabricated as described above was sample No. It was set to 1.

[Lithium ion battery of comparative example]
In the positive electrode body and the negative electrode body, sample No. 4 was used except that a powder of only PTFE was used as the binder. In the same manner as in Example 1, a lithium ion battery was produced. This lithium ion battery is referred to as Sample No. 2.

  In addition, in the positive electrode body and the negative electrode body, sample No. 1 was used except that powder (non-copolymer powder) in which PTFE and PVDF were mixed in a binder was used. In the same manner as in Example 1, a lithium ion battery was produced. This lithium ion battery is referred to as Sample No. It was set to 3.

[Battery evaluation]
Sample No. 1 to Sample No. For the lithium ion battery of No. 3, the cross section of each electrode body (positive electrode active material layer and negative electrode active material layer) was observed with a scanning electron microscope (SEM). FIG. 1 shows SEM photographs (120 times) of the positive electrode body and the negative electrode body of each sample. 1 (1-1) shows sample No. No. 1 positive electrode body (1-2) is sample No. 1 shows a negative electrode body, and it can be seen that the constituent materials are uniformly dispersed throughout both electrode bodies. FIG. 1 (2-1) shows sample no. No. 2 positive electrode body, (2-2) is Sample No. 2 shows a negative electrode body, and the black lump is due to the aggregation of the binder, and it can be seen that a plurality of the lump are present. FIG. 1 (3-1) shows sample no. 3 and (3-2) are sample Nos. 3 and a lump due to the aggregation of the binder is shown in Sample No. Although it is not coarse compared with 2, it turns out that there exist multiple.

Next, each sample was incorporated in a coin cell, and the resistance value of each lithium ion battery was measured by an AC impedance method. The measurement conditions are an applied voltage of 5 mV and a measurement frequency of 0.01 to 100 kHz. The measurement results are shown in Sample No. 1 was 118 Ω · cm ² , whereas sample no. 2 is 6200 Ω · cm ² , sample No. In No. 3, the resistance was as very large as 1700 Ω · cm ² .

Moreover, about the lithium ion battery of each sample, the charge / discharge cycle test which makes charging / discharging 1 cycle is carried out by the constant current of 0.2 mA / cm < ² > with the cutoff voltage of 3.0-4.2V, The charge / discharge cycle characteristics were investigated. This result is shown in Sample No. 1 is stable even after Ave 210 cycles, while sample no. 2 could not be charged to 4.2 V in Ave 17 cycles. In Fig. 3, it was confirmed that the battery could not be charged up to 4.2 V in the Ave125 cycle.

  From the above results, in the electrode body, by using a copolymer of PTFE and PVDF as a binder in the positive electrode active material layer and the negative electrode active material layer, the binder is uniformly dispersed throughout the active material layer without aggregation. Therefore, it is considered that the internal resistance can be reduced, and sufficient paths for ion conduction and electron conduction can be secured.

  The present invention can be implemented with appropriate modifications without departing from the scope of the present invention, and the scope of the present invention is not limited to the above-described configuration. For example, the nonaqueous electrolyte battery electrode body of the present invention can be used only for one of the positive electrode body and the negative electrode body.

  The nonaqueous electrolyte battery of the present invention can be suitably used as a nonaqueous electrolyte battery as a power source for various electric devices.

Claims (5)

An electrode body for a non-aqueous electrolyte battery in which an active material layer is formed on a current collector,
The active material layer contains an active material powder, a sulfide-based solid electrolyte powder, and a binder,
The binder is a copolymer of polytetrafluoroethylene and polyvinylidene fluoride. An electrode body for a nonaqueous electrolyte battery, wherein the binder is a copolymer of polytetrafluoroethylene and polyvinylidene fluoride.   2. The electrode body for a nonaqueous electrolyte battery according to claim 1, wherein a copolymerization ratio of the polytetrafluoroethylene and the polyvinylidene fluoride is 10:90 to 40:60.   3. The electrode for a nonaqueous electrolyte battery according to claim 1, wherein a mixing ratio of the active material powder and the sulfide-based solid electrolyte powder is 80:20 to 40:60 in a volume ratio. body. A non-aqueous electrolyte battery comprising a positive electrode body, a negative electrode body, and a solid electrolyte layer disposed between both electrode bodies,
At least one of the said positive electrode body and a negative electrode body is the electrode body for nonaqueous electrolyte batteries of any one of Claims 1-3, The nonaqueous electrolyte battery characterized by the above-mentioned.   The non-aqueous electrolyte battery according to claim 4, wherein the solid electrolyte layer contains a sulfide-based solid electrolyte.