JP6585933B2 - Lithium-ion battery and wearable optical equipment - Google Patents

Description

  The present invention relates to a lithium ion battery provided in a housing of a wearable optical device and a wearable optical device including the lithium ion battery.

  Wearable optical devices such as eyeglasses, such as head-mounted displays and wearable glasses, that perform various displays, operations, etc. with power supplied from the outside or from a battery built in the wearable optical device. Mold optics are well known. In such a wearable optical device that requires a power supply, it is preferable to incorporate the power supply in the wearable optical device from the viewpoint of wearability and portability (see, for example, Patent Documents 1 and 2).

JP 2014-233300 A JP2015-38542A

  However, in the conventional wearable optical device described above, since the battery as a power source is formed in a known columnar shape or a long columnar shape, such a predetermined space for storing the battery is provided in the wearable optical device. It was necessary to secure it. On the other hand, the outer shape of the housing of the wearable optical device is preferably determined in consideration of the ease of wearing and the comfort when worn. Therefore, the case of the wearable optical device is often formed in a free shape, but if a battery of a predetermined shape is stored in such a free shape case, there is a possibility that the space inside the case cannot be effectively used. It was happening.

  The present invention has been made in view of the above-described problems, and one of its purposes is to provide a lithium ion battery and a wearable optical device that can effectively use the internal space provided in the wearable optical device. It is said.

The present invention includes a structure that includes an internal space and that forms at least a part of a housing of a wearable optical device, both ends of the structure are fixed to the structure, and the internal space is disposed in the positive electrode chamber. A separator that is divided into a negative electrode chamber, a positive electrode composition that includes a positive electrode active material filled in each of the positive electrode chamber and the negative electrode chamber, and an electrolyte solution, and a negative electrode composition that includes the negative electrode active material and the electrolyte solution. The lithium ion battery solves at least one of the above-described problems.

Since each of the positive electrode chamber and the negative electrode chamber is filled with the positive electrode composition and the negative electrode composition, the degree of freedom of the shape of the inner surface of the inner space of the casing is increased, and the inner space between the inner surface and the positive electrode and the negative electrode composition is increased. The gap can be made sufficiently small.
Here, the internal space is preferably provided in a support portion of the wearable optical device. In addition, it is preferable that the lithium ion battery has flexibility and can supply power in a bent state.

  Here, it is preferable that at least a part of the inner surface of at least one of the positive electrode chamber and the negative electrode chamber is formed as a curved surface. Moreover, it is preferable to form a separator in flat form. In addition, a current collector is preferably provided in each of the positive electrode chamber and the negative electrode chamber. At this time, the current collector preferably has a portion that is not equidistant from the separator, and more preferably, the current collector is provided along the inner surface of the internal space.

  Moreover, it is preferable to coat at least a part of at least one of the positive electrode composition and the negative electrode composition with a layer mainly comprising a conductive additive and a polymer. Furthermore, at least one of the positive electrode composition and the negative electrode composition preferably contains a fibrous material. In this case, the fibrous material is preferably carbon fiber.

Further, the present invention is applied to a wearable optical apparatus having a structure including an internal space and including a lithium ion battery provided in the internal space of the structure. Then, both ends of the lithium ion battery are fixed to the structure and disposed in the internal space of the structure, and a separator that divides the internal space into a positive electrode chamber and a negative electrode chamber, and a positive electrode chamber and a negative electrode chamber are filled. By providing a positive electrode composition comprising a positive electrode active material and an electrolyte solution and a negative electrode composition comprising a negative electrode active material and an electrolyte solution, at least one of the above-mentioned problems has been solved.

  ADVANTAGE OF THE INVENTION According to this invention, the lithium ion battery which can use effectively the internal space provided in the wearable optical apparatus can be provided.

It is a perspective view which shows the part of an example of the spectacles to which the lithium ion battery which is one Embodiment of this invention was applied. It is AA arrow sectional drawing of FIG. It is a perspective view which shows an example of the spectacles to which the lithium ion battery of one Embodiment was applied.

(One embodiment)
With reference to FIGS. 1-3, the lithium ion battery which is one Embodiment of this invention is demonstrated. 1 is a perspective view showing a portion of an example of eyeglasses to which a lithium ion battery according to an embodiment of the present invention is applied, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. It is a perspective view which shows an example of the spectacles in which the lithium ion battery was used.

  As shown in FIGS. 1 and 3, the lithium ion battery L according to the present embodiment is an example of a support unit as the structure 1 that constitutes a part of the casing that constitutes the spectacle G that is a wearable optical device. It is stored inside the temple. As shown in detail in FIG. 2, a hollow having a substantially barrel-shaped cross section is formed inside the vine which is the structure 1, and this hollow is defined as an internal space 1 a.

  More specifically, the structure body 1 is divided into left and right parts in FIG. 2 to be divided housings 1d and 1e, and one of the divided housings 1d has a locking portion 1f protruding inward of the internal space 1a. Is formed. The flat separator 4 is fixed in the internal space 1a in contact with the locking portion 1f when the structure 1 is configured by the pair of divided housings 1d and 1e being opposed and fixed. Thus, the internal space 1 a is divided into a positive electrode chamber 2 and a negative electrode chamber 3.

  In the positive electrode chamber 2 and the negative electrode chamber 3, a positive electrode current collector 7 and a negative electrode current collector 8 having a cross-sectional elliptic arc shape are disposed along the curved surface that is the inner surface of the internal space 1 a. In addition, the positive electrode active material 5 and the negative electrode active material 6 are filled in the positive electrode chamber 2 and the negative electrode chamber 3 in a state where the negative electrode current collector 8 is disposed in the internal space 1a. Is formed.

  Here, in this specification, “filled” means a state in which the positive electrode active material particles and the negative electrode active material particles are accommodated in the positive electrode chamber 2 and the negative electrode chamber 3, respectively. This means that the material particles, the negative electrode active material particles, and the electrolyte are accommodated in the positive electrode chamber 2 and the negative electrode chamber 3, respectively. More preferably, it means a state in which positive electrode active material particles and negative electrode active material particles are mixed with an electrolyte.

  In the present invention, the positive electrode chamber 2 and the negative electrode chamber 3 are filled with a positive electrode composition containing a positive electrode active material and an electrolyte and a negative electrode composition containing a negative electrode active material and an electrolyte. The positive electrode active material particles and the negative electrode active material particles may be directly put into the positive electrode chamber 2 and the negative electrode chamber 3, respectively. The slurry containing the positive electrode active material or the negative electrode active material particles and the nonaqueous solvent is used as the positive electrode chamber 2 and the negative electrode The positive electrode composition slurry containing the positive electrode active material or the negative electrode active material particles and the electrolytic solution and the negative electrode composition slurry may be put in the positive electrode chamber 2 and the negative electrode chamber 3, respectively. May be. When the powdered positive electrode active material and the negative electrode active material particles are directly put into the positive electrode chamber 2 and the negative electrode chamber 3, the positive electrode composition and the negative electrode are respectively added to the positive electrode chamber 2 and the negative electrode chamber 3 by adding an electrolytic solution thereafter. The composition is filled.

  When a slurry-like material containing a positive electrode active material or negative electrode active material particles and a non-aqueous solvent is put in the positive electrode chamber 2 and the negative electrode chamber 3, respectively, the active material particles and the non-aqueous solvent can be separated by pressurization or decompression thereafter. The positive electrode composition and the negative electrode composition are filled in each of the positive electrode chamber 2 and the negative electrode chamber 3 by allowing the non-aqueous solvent to pass through the membrane and further adding an electrolyte. When the positive electrode active material or negative electrode active material particles and the slurry-like positive electrode composition and negative electrode composition containing the electrolytic solution are put in the positive electrode chamber 2 and the negative electrode chamber 3, respectively, the active material particles are further pressurized or reduced in pressure. A step of increasing the content of the positive electrode active material and the negative electrode active material contained in each of the positive electrode composition and the negative electrode composition by passing through a membrane capable of separating the electrolyte and the electrolyte and removing a part of the electrolyte May be.

  The membrane capable of separating the active material particles from the non-aqueous solvent or the electrolytic solution is not limited as long as it is a membrane capable of separating the active material particles from the non-aqueous solvent or the electrolytic solution, but the current collector and / or the separator. It is preferable that it is a film | membrane provided as.

  When the positive electrode and negative electrode active material particles are filled in the positive electrode chamber 2 and the negative electrode chamber 3, the positive electrode and negative electrode active material particles are uniformly distributed in the positive electrode chamber 2 and the negative electrode chamber 3 by applying vibration and impact to the structure 1. Filling is preferred.

  In addition, the substance obtained by mixing the positive electrode and negative electrode active material particles with the electrolytic solution or the non-aqueous solvent is usually in the form of a slurry, but depending on the weight ratio of the positive electrode and negative electrode active material particles to the electrolytic solution, It may become a substance close to.

  In the structure 1, through-holes 13 that penetrate the positive electrode current collector 7 and the negative electrode current collector 8 and reach the positive electrode chamber 2 and the negative electrode chamber 3 are formed. The positive electrode active material 5 and the negative electrode active material 6 are filled into the positive electrode chamber 2 and the negative electrode chamber 3 from the through holes 13 respectively, and after the positive electrode chamber 2 and the negative electrode chamber 3 are degassed under reduced pressure, the through holes 13 are passed through the electrode terminals 11. , 12 can be used to manufacture the lithium ion battery L of the present embodiment. In addition, the power source from the lithium ion battery L of the present embodiment can be taken out of the structure 1 through the electrode terminals 11 and 12.

The positive electrode active material particles constituting the positive electrode active material 5 include composite oxides of lithium and transition metals (for example, LiCoO ₂ , LiNiO ₂ , LiMnO ₂ and LiMn ₂ O ₄ ), transition metal oxides (for example, MnO ₂ and V ₂ O ₅ ), transition metal sulfides (eg, MoS ₂ and TiS ₂ ), and conductive polymers (eg, polyaniline, polypyrrole, polythiophene, polyacetylene, poly-p-phenylene, and polycarbazole).

In addition, as the negative electrode active material particles constituting the negative electrode active material 6, graphite, non-graphitizable carbon, amorphous carbon, polymer compound fired body (for example, those obtained by firing and carbonizing a phenol resin, a furan resin, etc.), Coke (for example, pitch coke, needle coke and petroleum coke), carbon fiber, conductive polymer (for example, polyacetylene and polyquinoline), tin, silicon, and metal alloy (for example, lithium-tin alloy, lithium-silicon alloy, lithium) -Aluminum alloy and lithium-aluminum-manganese alloy), composite oxides of lithium and transition metal (for example, Li ₄ Ti ₅ O ₁₂ ) and the like.

  In the battery of the present invention, the positive electrode and negative electrode active material particles are preferably coated active material particles in which at least a part of the surface is coated with a coating agent containing a coating resin and a conductive additive.

  The coating agent contains a coating resin, and when the periphery of the positive electrode active material particles is coated with the coating agent, the volume change of the electrode is alleviated and the expansion of the electrode can be suppressed. Examples of the coating resin include vinyl resin, urethane resin, polyester resin, polyamide resin, epoxy resin, polyimide resin, silicone resin, phenol resin, melamine resin, urea resin, aniline resin, ionomer resin, polycarbonate, and the like. Among these, vinyl resin, urethane resin, polyester resin or polyamide resin is preferable.

  As a conductive support agent, it selects from the material which has electroconductivity.

  Specifically, metal [aluminum, stainless steel (SUS), silver, gold, copper, titanium, etc.], carbon [graphite, carbon black (acetylene black, ketjen black, furnace black, channel black, thermal lamp black, etc.), Single-walled carbon nanotubes and multi-walled carbon nanotubes, etc.], and mixtures thereof, but are not limited thereto.

  These conductive assistants may be used alone or in combination of two or more. Moreover, these alloys or metal oxides may be used. From the viewpoint of electrical stability, aluminum, stainless steel, carbon, silver, gold, copper, titanium and mixtures thereof are preferred, silver, gold, aluminum, stainless steel and carbon are more preferred, and carbon is more preferred. is there. These conductive assistants may be those obtained by coating a particulate ceramic material or resin material with a conductive material (metal among the conductive auxiliary materials described above) by plating or the like.

  It is also possible to use conductive fibers as the conductive auxiliary. Examples of conductive fibers include carbon fibers such as PAN-based carbon fibers and pitch-based carbon fibers, conductive fibers obtained by uniformly dispersing highly conductive metal and graphite in synthetic fibers, and metals such as stainless steel. Examples thereof include fiberized metal fibers, conductive fibers in which the surface of organic fiber is coated with metal, and conductive fibers in which the surface of organic fiber is coated with a resin containing a conductive substance. Among these conductive fibers, carbon fibers are preferable.

  The coated active material particles are, for example, dropped into and mixed with a resin solution containing a coating resin over a period of 1 to 90 minutes in a state where the active material particles are put in a universal mixer and stirred at 30 to 500 rpm. It can be obtained by mixing, raising the temperature to 50 to 200 ° C. with stirring, reducing the pressure to 0.007 to 0.04 MPa, and holding for 10 to 150 minutes.

  In the step of filling the positive electrode chamber 2 and the negative electrode chamber 3 with the positive electrode composition and the negative electrode composition, the slurry-like substances each including the positive electrode active material and the negative electrode active material particles are electrolyte slurry containing an electrolyte solution. It is preferably a solvent slurry containing a non-aqueous solvent.

  As the electrolytic solution, an electrolytic solution containing an electrolyte and a non-aqueous solvent used for manufacturing a lithium ion battery can be used.

As the electrolyte, those used in ordinary electrolytic solutions can be used. For example, lithium salts of inorganic acids such as LiPF ₆ , LiBF ₄ , LiSbF ₆ , LiAsF ₆ and LiClO ₄ , LiN (CF ₃ SO ₂ ) ₂ and lithium salts of organic acids such as LiN (C ₂ F ₅ SO ₂ ) ₂ and LiC (CF ₃ SO ₂ ) ₃ . Among these, LiPF ₆ is preferable from the viewpoint of battery output and charge / discharge cycle characteristics.

  As the non-aqueous solvent, those used in ordinary electrolytic solutions can be used, for example, lactone compounds, cyclic or chain carbonates, chain carboxylates, cyclic or chain ethers, phosphates, nitriles. Compounds, amide compounds, sulfones, sulfolanes and the like and mixtures thereof can be used.

  A non-aqueous solvent may be used individually by 1 type, and may use 2 or more types together.

  Among the nonaqueous solvents, lactone compounds, cyclic carbonates, chain carbonates and phosphates are preferred from the viewpoint of battery output and charge / discharge cycle characteristics, and more preferred are lactone compounds, cyclic carbonates and chains. A carbonic acid ester is more preferable, and a mixed liquid of a cyclic carbonate and a chain carbonate is more preferable. Particularly preferred is propylene carbonate (PC) or a mixture of ethylene carbonate (EC) and diethyl carbonate (DEC).

  The slurry is preferably prepared by dispersing and slurrying the active material particles and the conductive additive at a concentration of 10 to 60% by weight based on the weight of the electrolytic solution or the non-aqueous solvent.

  As the separator 4, polyethylene, polypropylene, etc., microporous membrane film made of polyolefin, multilayer film of porous polyethylene film and polypropylene, non-woven fabric made of polyester fiber, aramid fiber, glass fiber, etc., and silica on the surface thereof, Examples include those having ceramic fine particles such as alumina and titania attached thereto.

  As the current collectors 7 and 8, a metal current collector or a resin current collector can be used. As the metal current collector, a known metal current collector can be used. For example, the metal current collector is selected from the group consisting of copper, aluminum, titanium, nickel, tantalum, niobium, hafnium, zirconium, zinc, tungsten, bismuth, antimony, and alloys containing one or more of these, and stainless steel alloys. It is preferable that it consists of 1 or more types. The metal current collector may be formed from a thin plate or a metal foil, or a metal layer may be formed on the surface of the substrate by a technique such as sputtering, electrodeposition, or coating.

  The polymer material constituting the resin current collector may be a conductive polymer or a polymer having no conductivity.

  Polymer materials include polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), polycycloolefin (PCO), polyethylene terephthalate (PET), polyether nitrile (PEN), polytetrafluoroethylene (PTFE) Styrene butadiene rubber (SBR), polyacrylonitrile (PAN), polymethyl acrylate (PMA), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVdF), epoxy resin, silicone resin, or a mixture thereof.

  From the viewpoint of electrical stability, polyethylene (PE), polypropylene (PP), polymethylpentene (PMP) and polycycloolefin (PCO) are preferable, and polyethylene (PE), polypropylene (PP) and polymethylpentene are more preferable. (PMP).

  In addition, the resin current collector is intended to improve the conductivity of the resin current collector containing the conductive polymer material, or to impart conductivity to the resin current collector containing the polymer material having no conductivity. Therefore, it is preferable that a conductive filler is included. The conductive filler is selected from materials having conductivity. Preferably, from the viewpoint of suppressing ion permeation in the current collector, it is preferable to use a material that does not have conductivity with respect to ions used as the charge transfer medium. Specific examples include, but are not limited to, carbon materials, aluminum, gold, silver, copper, iron, platinum, chromium, tin, indium, antimony, titanium, nickel, and the like. These conductive fillers may be used alone or in combination of two or more. Moreover, these alloy materials, such as stainless steel (SUS), may be used. From the viewpoint of corrosion resistance, aluminum, stainless steel, carbon material, nickel, and more preferably carbon material are preferred. In addition, these conductive fillers may be those obtained by coating the metal shown above with a plating or the like around a particulate ceramic material or resin material.

  Specific examples of the resin current collector include those obtained by dispersing 5 to 20 parts of acetylene black as a conductive filler in polypropylene and then rolling with a hot press. Moreover, the thickness is not particularly limited, and can be applied in the same manner as known ones or with appropriate changes.

  The material constituting the seal member is not particularly limited as long as it is a material that has adhesiveness to the current collectors 7 and 8 and is durable to the electrolytic solution. Is preferred. Specific examples include epoxy resins, polyolefin resins, polyurethane resins, and polyvinylidene fluoride resins. Epoxy resins are preferable because they are highly durable and easy to handle.

  The structure 1 constituting the glasses G is made of metal, plastic, or the like, and at least a portion of the vine, which is an example of a support portion, has flexibility to allow bending along the longitudinal direction.

  As an example, the lithium ion battery L of the present embodiment is a head-mounted display supported on a vine which is a structure 1 constituting a part of the casing of the glasses G via a support member 14 as shown in FIG. Used as a power supply battery for driving H. At this time, the support member 14 is provided with a power supply member (not shown) that can be electrically connected to the electrode terminals 11 and 12 and the head mounted display H, and the power supply voltage from the lithium ion battery L is supplied via the power supply member. Supplied to the head mounted display H. Thereby, the spectacles G which are the wearable optical apparatus of this embodiment are comprised.

  Therefore, according to the lithium ion battery L of the present embodiment, it is possible to realize the lithium ion battery L that can effectively use the internal space provided in the spectacles G that are the wearable optical devices.

  Further, in the lithium ion battery L of the present embodiment, even if the structure (vine) 1 that is a support portion of the casing of the glasses G is bent when the glasses G are mounted, the characteristics as the lithium ion battery L are obtained. There is an advantage that the possibility of causing a problem is extremely small. That is, in the lithium ion battery L of this embodiment, since the positive electrode active material and the negative electrode active material are not heat-treated and dried as in the conventional lithium ion battery, the entire battery is bent. In this case, the possibility that the positive electrode or the negative electrode active material peels off from the current collector and causes a problem in characteristics as the lithium ion battery L is extremely small. In addition, the lithium ion battery L can continue to supply power supply voltage even if the vine portion of the structure 1 is bent in the longitudinal direction by wearing the glasses G.

  Furthermore, the through hole 13 is formed in the structure 1, the positive electrode active material 5 and the negative electrode active material 6 are injected and filled into the cavity of the structure 1 from the through hole 13, and the electrode terminals 11 and 12 are inserted. The lithium ion battery L can be formed, and the manufacturing process of the lithium ion battery L can be simplified. In addition, the electrode terminals 11 and 12 have both a function as an electrode terminal for supplying a power supply voltage to the head mounted display H and a function of a lid of the internal space 1a that is a cavity in the structure 1. is doing.

  Furthermore, in the lithium ion battery L of the present embodiment, since the battery is provided in a frame such as a vine which is the structure 1 constituting a part of the casing of the glasses G, it has only a function as a frame until now. Has an excellent effect of having a function as a battery. Therefore, as shown in FIG. 3, when the glasses G and the head mounted display H are combined and used as a wearable glass, power is supplied from the vine portion that is the structure 1. Time can be used, or the size of the head mounted display H can be reduced by omitting the battery storage space.

(Modification)
The details of the lithium ion battery and the wearable optical device of the present invention are not limited to the above-described embodiment, and various modifications are possible. As an example, in the above-described embodiment, the lithium ion battery L is provided on the portion of the vine that is the structure 1 constituting a part of the casing of the glasses G. However, the frame portion around the lens of the glasses G is not provided. You may provide the lithium ion battery L of this embodiment in structures, such as a flame | frame. The outer shape of the lithium ion battery according to the present invention is not particularly limited as long as it is appropriately selected from arbitrary shapes.

  Further, the wearable optical device provided with the lithium ion battery L of the present invention is not limited to the glasses G provided with the head mounted display H separately as in the above-described embodiment, and various modifications are possible. It is. As an example, the present invention can be suitably applied to eyeglasses (wearable glasses) in which a head mounted display H is integrated. Further, the wearable optical device provided with the lithium ion battery L of the present invention is not limited to the head mounted display H and the wearable glass, but can be applied to a liquid crystal shutter type 3D glass or the like.

  On the other hand, the shape of the separator 4 is not particularly limited, but the manufacturing process of the separator 4 and the like can be simplified by forming the separator 4 in a flat plate shape as in the above-described embodiment. The shape of the positive electrode current collector 7 and the negative electrode current collector 8 is not particularly limited, but as in the above-described embodiment, along the inner surface of the internal space 1a of the structure 1 constituting the lithium ion battery. It is preferable to provide the positive and negative electrode current collectors 7 and 8 because the capacity of the positive electrode composition and the negative electrode composition filled in the positive electrode chamber 2 and the negative electrode chamber 3 can be increased. Furthermore, at least the positive and negative electrode current collectors 7 and 8 and the separator 4 have portions that are not equally spaced, so that the storage space inside the structure 1 can be used more effectively.

  EXAMPLES Next, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the examples without departing from the gist of the present invention. Unless otherwise specified, “part” means “part by weight” and “%” means “% by weight”.

(Preparation of resin solution for coating)
A four-necked flask equipped with a stirrer, thermometer, reflux condenser, dropping funnel and nitrogen gas inlet tube was charged with 83 parts of ethyl acetate and 17 parts of methanol, and the temperature was raised to 68 ° C. Next, a monomer compounded liquid in which 242.8 parts of methacrylic acid, 97.1 parts of methyl methacrylate, 242.8 parts of 2-ethylhexyl methacrylate, 52.1 parts of ethyl acetate and 10.7 parts of methanol were blended, and 2,2′- An initiator solution prepared by dissolving 0.263 parts of azobis (2,4-dimethylvaleronitrile) in 34.2 parts of ethyl acetate and stirring with a dropping funnel over 4 hours while blowing nitrogen into a four-necked flask. The radical polymerization was carried out by dropping continuously. After the completion of dropping, an initiator solution prepared by dissolving 0.583 parts of 2,2′-azobis (2,4-dimethylvaleronitrile) in 26 parts of ethyl acetate was continuously added using a dropping funnel over 2 hours. Furthermore, the polymerization was continued for 4 hours at the boiling point. After removing the solvent to obtain 582 parts of resin, 1,360 parts of isopropanol was added to obtain a coating resin solution comprising a vinyl resin having a resin concentration of 30% by weight.

(Preparation of coated positive electrode active material particles)
96 parts by weight of LiCoO ₂ powder [Nippon Chemical Industry Co., Ltd. Cellseed C-8G] was put in a universal mixer and stirred at room temperature and 150 rpm, and the resin solution for coating (resin solid content concentration 30% by weight) was resin. The mixture was added dropwise over 60 minutes so that the solid content was 2 parts by weight, and the mixture was further stirred for 30 minutes.

  Next, 2 parts by weight of acetylene black [Denka Black (registered trademark) manufactured by Denki Kagaku Kogyo Co., Ltd.] was mixed in three portions with stirring, and the temperature was raised to 70 ° C. while stirring for 30 minutes, until 100 mmHg. The pressure was reduced and held for 30 minutes. The coated positive electrode active material particles were obtained by the above operation.

(Preparation of coated negative electrode active material particles)
Resin for coating in a state where 90 parts by weight of non-graphitizable carbon [Carbotron (registered trademark) PS (F) manufactured by Kureha Battery Materials Japan Co., Ltd.] is put in a universal mixer and stirred at room temperature and 150 rpm. The solution (resin solid content concentration of 30% by weight) was added dropwise and mixed over 60 minutes so that the resin solid content was 5 parts by weight, and stirred for another 30 minutes.

  Next, 5 parts by weight of acetylene black [Denka Black (registered trademark) manufactured by Denki Kagaku Kogyo Co., Ltd.] was mixed in three portions with stirring, and the mixture was heated to 70 ° C. with stirring for 30 minutes. The pressure was reduced to 01 MPa and held for 30 minutes. The coated negative electrode active material particles were obtained by the above operation.

(Preparation of electrolyte)
LiPF ₆ was dissolved at a rate of 1 mol / L in a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC) (volume ratio 1: 1) to prepare an electrolytic solution for a lithium ion battery.

(Production of positive electrode-coated active material slurry)
67 parts by weight of the coated positive electrode active material, carbon fiber [Osaka Gas Chemical Co., Ltd. Donacarbo Mild S-243: average fiber length 500 μm, average fiber diameter 13 μm] 1 part by weight, and 32 parts by weight of the above electrolyte were mixed. A positive electrode-coated active material slurry was prepared.

(Manufacture of negative electrode-coated active material slurry)
A negative electrode-coated active material slurry was prepared by mixing 52 parts by weight of coated negative electrode active material particles, 1 part by weight of the same carbon fiber used in the production of the positive electrode-coated active material slurry, and 47 parts by weight of the electrolytic solution.

(Manufacture of lithium ion batteries 1)
A positive electrode active material slurry was poured and a positive electrode active material slurry was injected to form a positive electrode active material layer. Subsequently, a negative electrode active material slurry was formed by spreading a separator and forming a negative electrode active material layer. Subsequently, after covering the negative electrode current collector, the structure (case) was sealed with an adhesive.

  In order to confirm the operation as a battery, a charge / discharge tester was connected to the lead portion from the current collector, and a charge / discharge test was performed. It was confirmed that charging / discharging was possible and functioned as a lithium ion secondary battery.

(Manufacture of lithium ion batteries 2)
The inside of a substantially frustoconical structure (case) sealed at the bottom was separated by a separator to form a positive electrode chamber and a negative electrode chamber, and a positive electrode current collector and a negative electrode current collector were provided on the respective inner walls. Subsequently, the positive electrode chamber and the negative electrode chamber were filled with a positive electrode active material slurry and a negative electrode active material slurry composed of a powdered positive electrode active material and a negative electrode active material and an electrolyte, respectively, and then the upper portion of the structure was sealed. .

  In order to confirm the operation as a battery, a charge / discharge tester was connected to the lead portion from the current collector and a charge / discharge test was performed. Also in this case, it was confirmed that charging / discharging was possible and functioned as a lithium ion secondary battery.

L Lithium ion battery 1 Housing 1a Internal space 2 Positive electrode chamber 3 Negative electrode chamber 4 Separator 5 Positive electrode active material 6 Negative electrode active material 7 Positive electrode current collector 8 Negative electrode current collector 11, 12 Electrode terminal

Claims (11)

A structure having an internal space and constituting at least a part of a housing of the wearable optical device;
Both ends are fixed to the structure and disposed in the internal space, and the separator divides the internal space into a positive electrode chamber and a negative electrode chamber,
A lithium ion comprising: a positive electrode composition comprising a positive electrode active material and an electrolyte filled in each of the positive electrode chamber and the negative electrode chamber; and a negative electrode composition comprising a negative electrode active material and an electrolyte. battery. The lithium ion battery according to claim 1,
The lithium ion battery is characterized in that the internal space is provided in a support portion of the wearable optical device. The lithium ion battery according to claim 1 or 2,
The lithium ion battery has flexibility and can supply power in a bent state. The lithium ion battery according to any one of claims 1 to 3,
At least a part of the inner surface of at least one of the positive electrode chamber and the negative electrode chamber is formed as a curved surface. In the lithium ion battery according to any one of claims 1 to 4,
A lithium ion battery, wherein a current collector is provided in each of the positive electrode chamber and the negative electrode chamber. The lithium ion battery according to claim 5,
The current collector has a portion that is not equidistant from the separator. The lithium ion battery according to claim 6,
The current collector is provided along the inner surface of the internal space. In the lithium ion battery according to any one of claims 1 to 7,
Lithium ion, wherein at least part of at least one of the positive electrode composition and the negative electrode composition is covered with a layer mainly comprising a conductive additive and a polymer. battery. The lithium ion battery according to claim 8,
At least one of the positive electrode composition and the negative electrode composition contains a fibrous material. The lithium ion battery according to claim 9,
The lithium ion battery, wherein the fibrous substance is carbon fiber. A wearable optical apparatus having a structure including an internal space and including a lithium ion battery provided in the internal space,
The lithium ion battery is
Both ends are fixed to the structure and disposed in the internal space of the structure, and a separator that divides the internal space into a positive electrode chamber and a negative electrode chamber;
A mounting type comprising: a positive electrode composition containing a positive electrode active material and an electrolyte solution filled in each of the positive electrode chamber and the negative electrode chamber; and a negative electrode composition containing a negative electrode active material and an electrolyte solution. Optical equipment.

Images