JP2020087851A - Active material recycle system - Google Patents

Abstract

To effectively use an active material using an expensive metal by repeatedly reusing it at plural times.SOLUTION: An active material recycle system is an active material recycle system that repeatedly uses a coated active material in a lithium ion battery having an electrode active material layer formed by a non-binding body of the coated active material of which each of active material particles is coated with a coating material. The active material recycle system comprises: a step of determining a recycle period as a primary product by comparing a battery capacitance which is defined in a specification as the battery capacitance and the primary product by transmitting the battery capacitance measured by a battery capacitance measurement part on a computer connected via an electric communication line is transmitted from the battery capacitance measurement part measuring the battery capacitance of the lithium ion battery as a primary product; a step of decomposing the lithium ion battery as a primary product to fetch the coated active material; and a step of producing the lithium ion battery as a secondary product by using the coated active material to be fetched.SELECTED DRAWING: Figure 1

Description

The present invention relates to an active material recycling system.

BACKGROUND ART Lithium ion (secondary) batteries have been widely used in various applications in recent years as high-capacity, small-sized and lightweight secondary batteries. In a general lithium ion battery, a positive electrode active material layer containing a positive electrode active material, a binder resin and an electrolytic solution, and a negative electrode active material layer containing a negative electrode active material, a binder resin and an electrolytic solution are laminated with a separator interposed therebetween. It is housed in a container in a closed state (see, for example, Patent Document 1).

Nickel oxide or cobalt oxide is used as the material of the positive electrode active material. The prices of these metals are expensive, and their reserves are limited, so price fluctuations are large.
Therefore, it is desired to stably manufacture a lithium ion battery by recycling and using an active material containing these metals.

JP, 2006-324118, A

In a conventional lithium-ion battery, the positive electrode active material layer and the negative electrode active material layer contain a binder resin, and the positive electrode active material layer and the negative electrode active material layer are solidified by the binder resin, and the active material layer is a current collector. It was difficult to take out the active material from the lithium-ion battery because it was strongly bound to.

Further, even if the active material could be taken out from such a lithium ion battery, the cost required for taking it out was high, and it was not realistic to construct a system including recycling.

Even if the active material is recycled, the battery capacity of a battery manufactured using the recycled active material may be lower than the battery capacity of a new battery. It could not be used for the same purpose as.
Therefore, there is also a need for a method of effectively using a recycled battery manufactured by using an active material after recycling.

The present invention has been made to solve the above problems, and provides an active material recycling system that can be effectively used by repeatedly reusing an active material using an expensive metal a plurality of times. The target is.

The active material recycling system of the present invention includes a coating active material in which active material particles for a lithium ion battery are coated with a coating material, and a coating in a lithium ion battery including an electrode active material layer formed of a non-bound body of the coating active material. An active material recycling system that uses active materials repeatedly,
Regarding the lithium-ion battery as the primary product, a battery capacity measuring unit that measures the battery capacity and a computer that determines the recycling time are connected through an electric communication line, and the battery capacity measured by the battery capacity measuring unit is the above. The primary product is sent to a computer and compared with the battery capacity received by the computer and the battery capacity defined in the specifications of the primary product to determine the recycling time. To determine when to recycle the lithium-ion battery as
Disassembling the lithium ion battery as the primary product and taking out the coated active material,
And a step of producing a lithium ion battery as a secondary product using the coated active material containing the active material taken out from the primary product.

According to the present invention, it is possible to provide an active material recycling system that can be effectively used by repeatedly reusing an active material using an expensive metal a plurality of times.

FIG. 1 is a flowchart showing the flow of processing of the active material recycling system.

Hereinafter, the present invention will be described in detail.
In addition, in this specification, when describing as a lithium ion battery, it is a concept including a lithium ion secondary battery.

The active material recycling system of the present invention includes a coating active material in which active material particles for a lithium ion battery are coated with a coating material, and a coating in a lithium ion battery including an electrode active material layer formed of a non-bound body of the coating active material. In an active material recycling system that repeatedly uses active materials, a battery capacity measuring unit that measures the battery capacity of a lithium-ion battery as a primary product and a computer that determines when to recycle are connected through a telecommunication line. The battery capacity measured by the battery capacity measuring unit is sent to the computer, and the battery capacity received by the computer is compared with the battery capacity defined in the specifications as the primary product to determine the recycling time. A step of determining the recycling time of the lithium ion battery as the primary product using a recycling time determining means for determining, a step of disassembling the lithium ion battery as the primary product and taking out the coated active material, the step 1 A step of producing a lithium ion battery as a secondary product using the coated active material containing the active material taken out from the next product.

First, a lithium ion battery to be recycled in the active material recycling system of the present invention will be described.
The lithium-ion battery includes a coated active material in which active material particles for a lithium-ion battery are coated with a coating material, and includes an electrode active material layer formed of a non-bound body of the coated active material.

As the lithium-ion battery active material particles, particles of a lithium-ion battery positive electrode active material or a lithium-ion battery negative electrode active material can be used.
As a positive electrode active material for a lithium ion battery, a composite oxide of lithium and a transition metal {a composite oxide having one kind of transition metal (LiCoO ₂ , LiNiO ₂ , LiAlMnO ₄ , LiMnO ₂ and LiMn ₂ O ₄ etc.), A composite oxide having two transition metal elements (for example, LiFeMnO ₄ , LiNi _1-x Co _x O ₂ , LiMn _1-y Co _y O ₂ , LiNi _1/3 Co _1/3 Al _1/3 O ₂ and LiNi. _0.8 Co _0.15 Al _0.05 O ₂ ) and a complex oxide having three or more kinds of metal elements [for example, LiM _a M′ _b M″ _c O ₂ (M, M′ and M″ are respectively It is a different transition metal element and satisfies a+b+c=1. For example, LiNi _1/3 Mn _1/3 Co _1/3 O ₂ ) etc.], lithium-containing transition metal phosphate (eg, LiFePO ₄ , LiCoPO ₄ , LiMnPO _{4) 4} and LiNiPO ₄ ), transition metal oxides (eg MnO ₂ and V ₂ O ₅ ), transition metal sulfides (eg MoS ₂ and TiS ₂ ) and conductive polymers (eg polyaniline, polyvinylidene fluoride, polypyrrole, polythiophene, Polyacetylene, poly-p-phenylene, polycarbazole) and the like, and two or more kinds may be used in combination.
The lithium-containing transition metal phosphate may have a part of the transition metal site replaced with another transition metal.

Examples of the negative electrode active material for lithium ion batteries include carbonaceous materials [graphite, non-graphitizable carbon, amorphous carbon, resin fired bodies (for example, those obtained by firing phenol resin and furan resin etc. to carbonize them), cokes (for example, Pitch coke, needle coke, petroleum coke, etc.) and carbon fiber, etc.], silicon-based materials [silicon, silicon oxide (SiOx), silicon-carbon composite (carbon particles whose surface is coated with silicon and/or silicon carbide, Silicon particles or silicon oxide particles whose surface is coated with carbon and/or silicon carbide, and silicon carbide) and silicon alloys (silicon-aluminum alloys, silicon-lithium alloys, silicon-nickel alloys, silicon-iron alloys, silicon- Titanium alloy, silicon-manganese alloy, silicon-copper alloy, silicon-tin alloy, etc.), conductive polymer (for example, polyacetylene and polypyrrole, etc.), metal (tin, aluminum, zirconium, titanium, etc.), metal oxide ( Examples thereof include titanium oxides and lithium/titanium oxides), metal alloys (for example, lithium-tin alloys, lithium-aluminum alloys and lithium-aluminum-manganese alloys) and the like, and mixtures of these with carbonaceous materials.
Among the negative electrode active materials for lithium ion batteries, those that do not contain lithium or lithium ions inside may be pre-doped to preliminarily contain lithium or lithium ions in part or all of the negative electrode active material.

The coating material contains a polymer compound.
In addition, the coating material preferably further contains a conductive agent.
With a coated active material in which the periphery of the active material for a lithium ion battery is coated with a coating material, the volume change of the active material particles is alleviated, and the expansion of the electrode can be suppressed.

Next, the polymer compound that constitutes the coating material will be specifically described.
Examples of the polymer compound forming the coating material include thermoplastic resins and thermosetting resins. Examples thereof include vinyl resin (A), urethane resin (B), polyester resin, polyamide resin, epoxy resin, polyimide resin, Examples thereof include silicone resins, phenol resins, melamine resins, urea resins, aniline resins, ionomer resins, polycarbonates, polysaccharides (sodium alginate) and mixtures thereof.
Among these, polymer compounds having a liquid absorption rate of 10% or more when immersed in an electrolytic solution and a tensile elongation at break of 10% or more in a saturated liquid absorption state are more preferable.

The vinyl resin (A) is a resin containing a polymer (A1) containing the vinyl monomer (a) as an essential constituent monomer.
In particular, the polymer (A1) preferably contains a vinyl monomer (a1) having a carboxyl group or an acid anhydride group as the vinyl monomer (a) or a vinyl monomer (a2) represented by the following general formula (2). ..
CH ₂ =C(R ¹ )COOR ² (2)
[In the formula (2), R ¹ is a hydrogen atom or a methyl group, and R ² is a linear alkyl group having 4 to 12 carbon atoms or a branched alkyl group having 4 to 36 carbon atoms. ]
Among the vinyl resins (A), those having a liquid absorption rate of 10% or more when immersed in an electrolytic solution and a tensile elongation at break of 10% or more in a saturated liquid absorption state are more preferable.

Examples of the vinyl monomer (a1) having a carboxyl group or an acid anhydride group include (meth)acrylic acid (a11), monocarboxylic acids having 3 to 15 carbon atoms such as crotonic acid and cinnamic acid; (anhydrous) maleic acid and fumaric acid. Acids, (anhydrous) itaconic acid, citraconic acid, mesaconic acid and other dicarboxylic acids having 4 to 24 carbon atoms; aconitic acid and other polycarboxylic acids having 6 to 24 carbon atoms and 3 to 4 or more valences Is mentioned. Among these, (meth)acrylic acid (a11) is preferable, and methacrylic acid is more preferable.

In the vinyl monomer (a2) represented by the general formula (2), R ¹ represents a hydrogen atom or a methyl group. R ¹ is preferably a methyl group.
R ² is preferably a linear or branched alkyl group having 4 to 12 carbon atoms or a branched alkyl group having 13 to 36 carbon atoms.

(A21) Ester compound in which R ² is a linear or branched alkyl group having 4 to 12 carbon atoms As the linear alkyl group having 4 to 12 carbon atoms, butyl group, pentyl group, hexyl group, heptyl group, octyl group, Examples thereof include nonyl group, decyl group, undecyl group and dodecyl group.
Examples of the branched alkyl group having 4 to 12 carbon atoms include 1-methylpropyl group (sec-butyl group), 2-methylpropyl group, 1,1-dimethylethyl group (tert-butyl group), 1-methylbutyl group, 1 ,1-dimethylpropyl group, 1,2-dimethylpropyl group, 2,2-dimethylpropyl group (neopentyl group), 1-methylpentyl group, 2-methylpentyl group, 3-methylpentyl group, 4-methylpentyl group , 1,1-dimethylbutyl group, 1,2-dimethylbutyl group, 1,3-dimethylbutyl group, 2,2-dimethylbutyl group, 2,3-dimethylbutyl group, 1-ethylbutyl group, 2-ethylbutyl group , 1-methylhexyl group, 2-methylhexyl group, 2-methylhexyl group, 4-methylhexyl group, 5-methylhexyl group, 1-ethylpentyl group, 2-ethylpentyl group, 3-ethylpentyl group, 1 ,1-Dimethylpentyl group, 1,2-dimethylpentyl group, 1,3-dimethylpentyl group, 2,2-dimethylpentyl group, 2,3-dimethylpentyl group, 2-ethylpentyl group, 1-methylheptyl group , 2-methylheptyl group, 3-methylheptyl group, 4-methylheptyl group, 5-methylheptyl group, 6-methylheptyl group, 1,1-dimethylhexyl group, 1,2-dimethylhexyl group, 1,3 -Dimethylhexyl group, 1,4-dimethylhexyl group, 1,5-dimethylhexyl group, 1-ethylhexyl group, 2-ethylhexyl group, 1-methyloctyl group, 2-methyloctyl group, 3-methyloctyl group, 4 -Methyloctyl group, 5-methyloctyl group, 6-methyloctyl group, 7-methyloctyl group, 1,1-dimethylheptyl group, 1,2-dimethylheptyl group, 1,3-dimethylheptyl group, 1,4 -Dimethylheptyl group, 1,5-dimethylheptyl group, 1,6-dimethylheptyl group, 1-ethylheptyl group, 2-ethylheptyl group, 1-methylnonyl group, 2-methylnonyl group, 3-methylnonyl group, 4- Methylnonyl group, 5-methylnonyl group, 6-methylnonyl group, 7-methylnonyl group, 8-methylnonyl group, 1,1-dimethyloctyl group, 1,2-dimethyloctyl group, 1,3-dimethyloctyl group, 1,4 -Dimethyloctyl group, 1,5-dimethyloctyl group, 1,6-dimethyloctyl group, 1,7-dimethyloctyl group, 1-ethyloctyl group, 2-ethyloctyl group, 1-methyldecyl group, 2-methyldecyl group , 3-meth Rudecyl group, 4-methyldecyl group, 5-methyldecyl group, 6-methyldecyl group, 7-methyldecyl group, 8-methyldecyl group, 9-methyldecyl group, 1,1-dimethylnonyl group, 1,2-dimethylnonyl group, 1 ,3-Dimethylnonyl group, 1,4-dimethylnonyl group, 1,5-dimethylnonyl group, 1,6-dimethylnonyl group, 1,7-dimethylnonyl group, 1,8-dimethylnonyl group, 1-ethylnonyl group Group, 2-ethylnonyl group, 1-methylundecyl group, 2-methylundecyl group, 3-methylundecyl group, 4-methylundecyl group, 5-methylundecyl group, 6-methylundecyl group, 7 -Methylundecyl group, 8-methylundecyl group, 9-methylundecyl group, 10-methylundecyl group, 1,1-dimethyldecyl group, 1,2-dimethyldecyl group, 1,3-dimethyldecyl group , 1,4-dimethyldecyl group, 1,5-dimethyldecyl group, 1,6-dimethyldecyl group, 1,7-dimethyldecyl group, 1,8-dimethyldecyl group, 1,9-dimethyldecyl group, 1 Examples include -ethyldecyl group and 2-ethyldecyl group.

(A22) ^{R 2} is preferably a branched alkyl group of the ester compound having a carbon number of 13-36 is a branched alkyl group having 13 to 36 carbon atoms, 1-alkyl group [1-methyl-dodecyl group, 1-butyl eicosyl group, 1-hexyl octadecyl group, 1-octyl hexadecyl group, 1-decyl tetradecyl group, 1-undecyl tridecyl group, etc.], 2-alkylalkyl group [2-methyldodecyl group, 2-hexyl octadecyl group, 2- Octyl hexadecyl group, 2-decyl tetradecyl group, 2-undecyl tridecyl group, 2-dodecyl hexadecyl group, 2-tridecyl pentadecyl group, 2-decyl octadecyl group, 2-tetradecyl octadecyl group, 2- Hexadecyl octadecyl group, 2-tetradecyl eicosyl group, 2-hexadecyl eicosyl group, etc.], 3 to 34-alkylalkyl group (3-alkylalkyl group, 4-alkylalkyl group, 5-alkylalkyl group, 32 -Alkylalkyl group, 33-alkylalkyl group and 34-alkylalkyl group, etc.), and propylene oligomer (7-11 mer), ethylene/propylene (molar ratio 16/1 to 1/11) oligomer, isobutylene oligomer ( 7 to 8 mer) and α-olefin (5 to 20 carbon atoms) oligomer (4 to 8 mer) and the like, and one or more branched alkyl groups such as a residue obtained by removing a hydroxyl group from an oxo alcohol. The mixed alkyl group etc. which it contains are mentioned.

The polymer (A1) preferably further contains an ester compound (a3) of a monovalent aliphatic alcohol having 1 to 3 carbon atoms and (meth)acrylic acid.
Examples of the monohydric aliphatic alcohol having 1 to 3 carbon atoms which constitutes the ester compound (a3) include methanol, ethanol, 1-propanol, and 2-propanol.

The content of the ester compound (a3) is preferably 10 to 60% by weight, and preferably 15 to 55% by weight, based on the total weight of the polymer (A1), from the viewpoint of suppressing the change in volume of the positive electrode active material. Is more preferable and 20 to 50% by weight is further preferable.

Further, the polymer (A1) preferably further contains a salt (a4) of an anionic monomer having a polymerizable unsaturated double bond and an anionic group.
Examples of the structure having a polymerizable unsaturated double bond include a vinyl group, an allyl group, a styrenyl group and a (meth)acryloyl group.
Examples of the anionic group include a sulfonic acid group and a carboxyl group.
The anionic monomer having a polymerizable unsaturated double bond and an anionic group is a compound obtained by these combinations, and examples thereof include vinyl sulfonic acid, allyl sulfonic acid, styrene sulfonic acid and (meth)acrylic acid. Be done.
The (meth)acryloyl group means an acryloyl group and/or a methacryloyl group.
Examples of the cation that constitutes the salt (a4) of the anionic monomer include lithium ion, sodium ion, potassium ion, and ammonium ion.

The content of the salt (a4) of the anionic monomer is preferably 0.1 to 15% by weight, and preferably 1 to 15% by weight based on the total weight of the polymer compound, from the viewpoint of internal resistance and the like. It is more preferable that the amount is 2 to 10% by weight.

The polymer (A1) preferably contains (meth)acrylic acid (a11) and an ester compound (a21), more preferably an ester compound (a3), and further a salt of an anionic monomer ( It is particularly preferable to include a4).

The polymer compound is (meth)acrylic acid (a11), an ester compound (a21) represented by the following general formula (1), an ester of a monovalent aliphatic alcohol having 1 to 3 carbon atoms and (meth)acrylic acid. The ester compound (a21) obtained by polymerizing a monomer composition containing the compound (a3) and a salt (a4) of an anionic monomer having a polymerizable unsaturated double bond and an anionic group. It is preferable that the weight ratio of [(meth)acrylic acid (a11)] and [(ester compound (a21)/(meth)acrylic acid (a11)]] be 10/90 to 90/10.
CH ₂ =C(R ¹ )COOR ² (1)
[R ¹ is a hydrogen atom or a methyl group, and R ² is a linear or branched alkyl group having 4 to 12 carbon atoms. ]
When the weight ratio of the ester compound (a21) and the (meth)acrylic acid (a11) is 10/90 to 90/10, the polymer obtained by polymerizing the same has good adhesiveness to the positive electrode active material and is peeled off. Hard to do.
The weight ratio is preferably 30/70 to 85/15, and more preferably 40/60 to 70/30.

Further, the monomer constituting the polymer (A1) includes a vinyl monomer (a1) having a carboxyl group or an acid anhydride group, a vinyl monomer (a2) represented by the general formula (2), and a carbon number of 1 To an ester compound (a3) of monohydric aliphatic alcohol with (meth)acrylic acid of (3) and a salt of an anionic monomer having a polymerizable unsaturated double bond and an anionic group (a4) The copolymerizable vinyl monomer (a5) containing no active hydrogen may be contained.
Examples of the copolymerizable vinyl monomer (a5) containing no active hydrogen include the following (a51) to (a58).
(A51) Hydrocarbon formed from linear aliphatic monool having 13 to 20 carbon atoms, alicyclic monool having 5 to 20 carbon atoms or araliphatic monool having 7 to 20 carbon atoms and (meth)acrylic acid Carbyl (meth)acrylate Examples of the monool include (i) straight-chain aliphatic monool (tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, heptadecyl alcohol, stearyl alcohol, nonadecyl alcohol, arachidyl alcohol). Etc.), (ii) alicyclic monool (cyclopentyl alcohol, cyclohexyl alcohol, cycloheptyl alcohol, cyclooctyl alcohol, etc.), (iii) araliphatic monool (benzyl alcohol, etc.) and mixtures of two or more thereof. Can be mentioned.

(A52) Poly(n=2 to 30) oxyalkylene (C2 to C4) alkyl (C1 to C18) ether (meth)acrylate [ethylene oxide of methanol (hereinafter abbreviated as EO) 10 mol adduct (meta) ) Acrylate, propylene oxide of methanol (hereinafter abbreviated as PO) 10 mol addition product (meth)acrylate, etc.]

(A53) Nitrogen-containing vinyl compound (a53-1) Amido group-containing vinyl compound (i) C3-C30 (meth)acrylamide compound, for example, N,N-dialkyl (C1-C6) or diaralkyl (carbon number) 7 to 15) (meth)acrylamide (N,N-dimethylacrylamide, N,N-dibenzylacrylamide, etc.), diacetone acrylamide (ii) containing an amide group having 4 to 20 carbon atoms excluding the above (meth)acrylamide compound Vinyl compounds such as N-methyl-N-vinylacetamide, cyclic amides [pyrrolidone compounds (C6 to C13, such as N-vinylpyrrolidone)]

(A53-2) (meth)acrylate compound (i) dialkyl (C1-4) aminoalkyl (C1-4) (meth)acrylate [N,N-dimethylaminoethyl (meth)acrylate, N,N -Diethylaminoethyl (meth)acrylate, t-butylaminoethyl (meth)acrylate, morpholinoethyl (meth)acrylate, etc.]
(Ii) Quaternary ammonium group-containing (meth)acrylate {quaternary amino group-containing (meth)acrylate [N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, etc.] Compounds (quaternized with a quaternizing agent such as methyl chloride, dimethyl sulfate, benzyl chloride, dimethyl carbonate), etc.}

(A53-3) Heterocycle-containing vinyl compound Pyridine compound (having 7 to 14 carbon atoms, such as 2- or 4-vinylpyridine), imidazole compound (having 5 to 12 carbon atoms, such as N-vinylimidazole), pyrrole compound (having carbon atoms) 6 to 13, such as N-vinylpyrrole), pyrrolidone compound (having 6 to 13 carbon atoms, such as N-vinyl-2-pyrrolidone)

(A53-4) Nitrile group-containing vinyl compound A nitrile group-containing vinyl compound having 3 to 15 carbon atoms, for example, (meth)acrylonitrile, cyanostyrene, cyanoalkyl (C1 to 4) acrylate

(A53-5) Other nitrogen-containing vinyl compounds Nitro group-containing vinyl compounds (having 8 to 16 carbon atoms, such as nitrostyrene), etc.

(A54) vinyl hydrocarbon (a54-1) aliphatic vinyl hydrocarbon olefin having 2 to 18 carbon atoms or more (ethylene, propylene, butene, isobutylene, pentene, heptene, diisobutylene, octene, dodecene, octadecene, etc.), Diene having 4 to 10 or more carbon atoms (butadiene, isoprene, 1,4-pentadiene, 1,5-hexadiene, 1,7-octadiene, etc.)

(A54-2) alicyclic vinyl hydrocarbon, a cyclic unsaturated compound having 4 to 18 carbon atoms or more, such as cycloalkene (for example, cyclohexene), (di)cycloalkadiene [for example (di)cyclopentadiene], terpene ( Pinene and limonene), indene

(A54-3) Aromatic vinyl hydrocarbon An aromatic unsaturated compound having 8 to 20 carbon atoms or more, for example, styrene, α-methylstyrene, vinyltoluene, 2,4-dimethylstyrene, ethylstyrene, isopropylstyrene, butyl. Styrene, phenyl styrene, cyclohexyl styrene, benzyl styrene

(A55) Vinyl ester Aliphatic vinyl ester [C4-15, for example, alkenyl ester of aliphatic carboxylic acid (mono- or dicarboxylic acid) (for example, vinyl acetate, vinyl propionate, vinyl butyrate, diallyl adipate, isopropenyl acetate, Vinyl methoxyacetate)]
Aromatic vinyl ester [C9-20, for example, alkenyl ester of aromatic carboxylic acid (mono- or dicarboxylic acid) (for example, vinyl benzoate, diallyl phthalate, methyl-4-vinyl benzoate), aromatic carboxylic acid containing aromatic ring] Ester (eg acetoxystyrene)]

(A56) Vinyl ether Aliphatic vinyl ether [C3 to C15, for example, vinyl alkyl (C1 to C10) ether (vinyl methyl ether, vinyl butyl ether, vinyl 2-ethylhexyl ether, etc.), vinyl alkoxy (C1 to C6). Alkyl (C1-4) ether (vinyl-2-methoxyethyl ether, methoxybutadiene, 3,4-dihydro-1,2-pyran, 2-butoxy-2'-vinyloxydiethyl ether, vinyl-2-ethyl Mercaptoethyl ether, etc.), poly(2-4)(meth)allyloxyalkane (carbon number 2-6) (dialyloxyethane, triaryloxyethane, tetraallyloxybutane, tetramethallyloxyethane, etc.)], Aromatic vinyl ether (C8-20, eg vinyl phenyl ether, phenoxystyrene)

(A57) Vinyl ketone Aliphatic vinyl ketone (4 to 25 carbon atoms, for example, vinyl methyl ketone, vinyl ethyl ketone), aromatic vinyl ketone (9 to 21 carbon atoms, for example, vinyl phenyl ketone)

(A58) Unsaturated dicarboxylic acid diester Unsaturated dicarboxylic acid diester having 4 to 34 carbon atoms, for example, dialkyl fumarate (two alkyl groups are straight chain, branched chain or alicyclic groups having 1 to 22 carbon atoms. ), dialkyl maleate (two alkyl groups are linear, branched or alicyclic groups having 1 to 22 carbon atoms)

Among the examples exemplified as (a5) above, (a51), (a52) and (a53) are preferable from the viewpoint of withstand voltage.

In the polymer (A1), a vinyl monomer (a1) having a carboxyl group or an acid anhydride group, a vinyl monomer (a2) represented by the general formula (2), and a monovalent aliphatic alcohol having 1 to 3 carbon atoms. And (meth)acrylic acid ester compound (a3), a salt of an anionic monomer having a polymerizable unsaturated double bond and an anionic group (a4), and a copolymerizable vinyl monomer containing no active hydrogen ( The content of a5) is 0.1 to 80% by weight of (a1), 0.1 to 99.9% by weight of (a2), and 0 to (a3) based on the weight of the polymer (A1). It is preferable that 60% by weight, (a4) is 0 to 15% by weight, and (a5) is 0 to 99.8% by weight.
When the content of the monomer is within the above range, the liquid absorbability into the electrolytic solution becomes good.
More preferable contents are (a1) 15 to 60% by weight, (a2) 5 to 60% by weight, (a3) 10 to 60% by weight, (a4) 0.1 to 15% by weight, (a5) ) Is 5 to 69.9% by weight, and more preferable contents are (a1) 25 to 49% by weight, (a2) 15 to 39% by weight, (a3) 15 to 39% by weight, (a4) ) Is 1 to 15% by weight, and (a5) is 20 to 44% by weight.

The preferable lower limit of the number average molecular weight of the polymer (A1) is 3,000, more preferably 50,000, further preferably 100,000, particularly preferably 200,000, and the preferable upper limit is 2,000,000. It is preferably 1,500,000, more preferably 1,000,000, and particularly preferably 800,000.

The number average molecular weight of the polymer (A1) can be determined by gel permeation chromatography (hereinafter abbreviated as GPC) measurement under the following conditions.
Device: Alliance GPC V2000 (manufactured by Waters)
Solvent: Orthodichlorobenzene Standard substance: Polystyrene Detector: RI
Sample concentration: 3mg/ml
Column stationary phase: PLgel 10 μm, MIXED-B 2 in series (manufactured by Polymer Laboratories)
Column temperature: 135℃

The polymer (A1) can be produced by a known polymerization method (bulk polymerization, solution polymerization, emulsion polymerization, suspension polymerization, etc.).
At the time of polymerization, known polymerization initiators [azo initiators [2,2′-azobis(2-methylpropionitrile), 2,2′-azobis(2,4-dimethylvaleronitrile, etc.)], peroxides System initiator (benzoyl peroxide, di-t-butyl peroxide, lauryl peroxide, etc.) and the like}.
The amount of the polymerization initiator used is preferably 0.01 to 5% by weight, more preferably 0.05 to 2% by weight, further preferably 0.1 to 1.5% by weight, based on the total weight of the monomers. ..

Examples of the solvent used in the case of solution polymerization include esters (C2-8, such as ethyl acetate and butyl acetate), alcohols (C1-8, such as methanol, ethanol and octanol), hydrocarbons (carbon number). 4 to 8, such as n-butane, cyclohexane and toluene) and ketones (having 3 to 9 carbon atoms, such as methyl ethyl ketone), and the amount used is preferably 5 to 900% by weight, more preferably based on the total weight of the monomers. It is 10 to 400% by weight, more preferably 30 to 300% by weight, and the monomer concentration is preferably 10 to 95% by weight, more preferably 20 to 90% by weight, and further preferably 30 to 80% by weight.

Examples of the dispersion medium in emulsion polymerization and suspension polymerization include water, alcohols (eg ethanol), esters (eg ethyl propionate), light naphtha, etc., and emulsifiers are higher fatty acid (C 10-24) metal salts. (For example, sodium oleate and sodium stearate), higher alcohol (having 10 to 24 carbon atoms) sulfate metal salt (for example, sodium lauryl sulfate), ethoxylated tetramethyldecynediol, sodium sulfoethyl methacrylate, dimethylaminomethyl methacrylate, etc. Is mentioned. Further, polyvinyl alcohol, polyvinylpyrrolidone or the like may be added as a stabilizer.
The monomer concentration of the solution or dispersion is preferably 5 to 95% by weight, more preferably 10 to 90% by weight, further preferably 15 to 85% by weight, and the amount of the polymerization initiator used is based on the total weight of the monomers. It is preferably 0.01 to 5% by weight, more preferably 0.05 to 2% by weight.
In the polymerization, known chain transfer agents such as mercapto compounds (dodecyl mercaptan, n-butyl mercaptan, etc.) and/or halogenated hydrocarbons (carbon tetrachloride, carbon tetrabromide, benzyl chloride, etc.) can be used. .. The amount used is preferably 2% by weight or less, more preferably 0.5% by weight or less, still more preferably 0.3% by weight or less, based on the total weight of the monomers.

Next, the conductive agent contained in the covering material will be described.
The conductive agent contained in the coating material is selected from materials having conductivity.
Specifically, metal [nickel, aluminum, stainless steel (SUS), silver, copper, titanium, etc.], carbon [graphite and carbon black (acetylene black, ketjen black, furnace black, channel black, thermal lamp black, etc.), etc. ], and mixtures thereof, but are not limited thereto.
These conductive agents may be used alone or in combination of two or more. Moreover, you may use these alloys or metal oxides. From the viewpoint of electrical stability, aluminum, stainless steel, carbon, silver, copper, titanium and a mixture thereof are preferable, silver, aluminum, stainless steel and carbon are more preferable, and carbon is still more preferable. Further, as the conductive agent, a conductive material (a metal material among the above-mentioned conductive material materials) may be coated around the particle ceramic material or the resin material by plating or the like.

The average particle diameter of the conductive agent is not particularly limited, but from the viewpoint of the electrical characteristics of the battery, it is preferably 0.01 to 10 μm, more preferably 0.02 to 5 μm, and 0.1. It is more preferably from 03 to 1 μm. In addition, in this specification, a "particle diameter" means the largest distance L among the distances between arbitrary two points on the outline of a conductive agent. The value of the “average particle diameter” is an average value of particle diameters of particles observed in several to several tens of visual fields by using an observation means such as a scanning electron microscope (SEM) or a transmission electron microscope (TEM). The calculated value shall be adopted.

The shape (form) of the conductive agent is not limited to the particle form, and may be a form other than the particle form, or may be a form that has been put into practical use as a so-called filler-based conductive resin composition such as carbon nanotubes. ..

The conductive agent may be a conductive fiber having a fibrous shape.
As the conductive fibers, carbon fibers such as PAN-based carbon fibers and pitch-based carbon fibers, conductive fibers obtained by uniformly dispersing metal with good conductivity or graphite in synthetic fibers, metals such as stainless steel, etc. Examples include fibrous metal fibers, conductive fibers obtained by coating the surface of organic fibers with a metal, and conductive fibers obtained by coating the surface of organic fibers with a resin containing a conductive substance. Among these conductive fibers, carbon fiber is preferable. A polypropylene resin in which graphene is kneaded is also preferable.
When the conductive agent is a conductive fiber, its average fiber diameter is preferably 0.1 to 20 μm.

The coating active material for a lithium ion battery may be produced by mixing a polymer compound, a conductive agent and an active material for a lithium ion battery, and after preparing a coating material by mixing a polymer compound and a conductive agent. Alternatively, it may be manufactured by mixing the coating material and a lithium-ion battery active material.
When the active material for lithium-ion batteries, the polymer compound and the conductive agent are mixed, the order of mixing is not particularly limited.

The coated active material for a lithium ion battery is, for example, a mixture of a polymer solution containing a polymer compound added dropwise over 1 to 90 minutes in a state where the active material for a lithium ion battery is placed in a universal mixer and stirred at 30 to 50 rpm. Then, the conductive agent is further mixed, the temperature is raised to 50 to 200° C. with stirring, the pressure is reduced to 0.007 to 0.04 MPa, and then the temperature is maintained for 10 to 150 minutes.

When the coating active material for a lithium ion battery is used as the electrode active material layer, the coating active material for a lithium ion battery and the conductive material are contained in an amount of 30 to 60% by weight based on the weight of the dispersion medium (water, electrolytic solution or solvent). The dispersion liquid which is dispersed at a concentration to form a slurry, is applied to a current collector with a coating device such as a bar coater, and then dried when water or a solvent is used as a dispersion medium, thereby forming an electrolyte solution as a dispersion medium. When used, the excess electrolyte may be absorbed by an absorber such as a sponge, or the dispersion medium may be removed by suction through a mesh, and if necessary, may be pressed by a pressing machine.
It is preferable that the electrode binder is not added to the dispersion liquid. In a lithium-ion battery electrode that does not use a coated active material as an active material, it is necessary to maintain a conductive path by fixing the active material in the electrode with an electrode binder. However, when a coated active material for a lithium ion battery is used, it is not necessary to add a binder for an electrode because the conductive material can maintain a conductive path without fixing the active material in the electrode by the action of the coating material. By not adding the electrode binder, the active material is not fixed in the electrode active material layer, so that the ability to relax the volume change of the active material is further improved.
It can be said that the electrode active material layer thus obtained is composed of a non-binder of the coated active material.
Note that the conductive material used for manufacturing the electrode active material layer is different from the conductive agent contained in the coating material, is present outside the coating material that the coating active material has, and from the surface of the coating active material in the electrode active material layer. Has the function of improving the electronic conductivity of.

When a lithium ion battery is manufactured using an electrode active material layer containing a coated active material for a lithium ion battery, a counter electrode is combined and housed in a cell container together with a separator, and an electrolytic solution is injected into the cell container. Can be manufactured by a method of sealing
In addition, a positive electrode is formed on one surface of the current collector and a negative electrode is formed on the other surface to produce a bipolar electrode, and the bipolar electrode is stacked with a separator and housed in a cell container to store an electrolyte solution. It can also be obtained by injecting and sealing the cell container.

As the separator, polyethylene, a microporous film of a polypropylene film, a multilayer film of a porous polyethylene film and polypropylene, a nonwoven fabric composed of polyester fiber, aramid fiber, glass fiber, and the like, and silica, alumina, titania, etc. on the surface thereof. Known lithium-ion battery separators such as those to which the ceramic fine particles are attached are mentioned.

As the electrolytic solution to be injected into the cell container, a known electrolytic solution containing an electrolyte and a non-aqueous solvent used for manufacturing a known lithium ion battery can be used.

As the electrolyte, those used in known electrolytic solutions can be used, and for example, lithium salts of inorganic acids such as LiN(FSO ₂ ) ₂ , LiPF ₆ , LiBF ₄ , LiSbF ₆ , LiAsF ₆ and LiClO ₄ , Examples thereof include lithium salts of organic acids such as LiN(CF ₃ SO ₂ ) ₂ , LiN(C ₂ F ₅ SO ₂ ) ₂ and LiC(CF ₃ SO ₂ ) ₃ . Of these, imide-based electrolytes [LiN(FSO ₂ ) ₂ , LiN(CF ₃ SO ₂ ) ₂ and LiN(C ₂ F ₅ SO ₂ ) ₂ ] and the like are preferable from the viewpoint of battery output and charge/discharge cycle characteristics. It is LiPF ₆ .

As the non-aqueous solvent, those used in known electrolytic solutions can be used, and examples thereof include lactone compounds, cyclic or chain carbonic acid esters, chain carboxylic acid esters, cyclic or chain ethers, phosphoric acid esters, and nitriles. Compounds, amide compounds, sulfones, sulfolanes, etc. and mixtures thereof can be used.

The electrolyte concentration of the electrolytic solution is preferably 1 to 5 mol/L, more preferably 1.5 to 4 mol/L, and further preferably 2 to 3 mol/L.
When the electrolyte concentration of the electrolytic solution is less than 1 mol/L, sufficient input/output characteristics of the battery may not be obtained, and when it exceeds 5 mol/L, the electrolyte may be deposited.
The electrolyte concentration of the electrolytic solution can be confirmed by extracting the electrolytic solution forming the lithium ion battery electrode or the lithium ion battery without using a solvent and measuring the concentration.

The active material to be recycled in the active material recycling system of the present invention may be either a positive electrode active material or a negative electrode active material, but since it is effective to recycle an expensive active material, the positive electrode active material is targeted. Is preferred.
In the following description, it is assumed that the active material is an expensive positive electrode active material, but the negative electrode active material may be the target.

The application of the lithium-ion battery as a primary product is not particularly limited, but it can be used for applications requiring a large battery capacity per unit volume. Examples include in-vehicle applications and mobile terminals (notebook computers, tablets, smartphones, mobile phones, etc.).
In particular, for in-vehicle applications, it is expected that a large number of lithium-ion batteries will be used to drive electric vehicles, hybrid vehicles, plug-in hybrid vehicles, and the like as the number of these vehicles increases. For this reason, since it is desired to recycle the lithium-ion battery used for in-vehicle use, it is more preferable to use it for in-vehicle use.
It is preferable that the primary product is an application that requires a battery capacity of 300 Wh/L or more.
The lithium-ion battery used for in-vehicle use may be one assembled into a module incorporating a plurality of cells.

The application of the lithium ion battery as the secondary product is not particularly limited, but after recycling, the battery capacity per unit volume becomes smaller than that of the primary product, so the required battery per unit volume is It is preferably used in applications where the capacity may be less than the primary product.
For example, stationary power supplies for home use and business use, and emergency power supplies are included.
As a secondary product, it is preferable that the secondary battery has a battery capacity of 200 Wh/L or more. Further, the battery capacity may be used for an application that may be less than 200 Wh/L.

Further, it is preferable that the use of the lithium ion battery as the primary product and the use of the lithium ion battery as the secondary product in the recycling system of the present invention are different.
It is preferable that the primary product is used for in-vehicle use and the secondary product is used for stationary power supply.

FIG. 1 is a flowchart showing the flow of processing of the active material recycling system.
In step S1 of determining the recycling time in the active material recycling system, the expiration date when the primary product can be used is determined as follows.
First, a lithium ion battery is used for the purpose of the lithium ion battery as a primary product (S11).
Lithium-ion batteries are used by repeating charging and discharging (using batteries).
When the lithium ion battery is charged, the battery capacity measuring unit 10 measures the battery capacity (S12).
The battery capacity measuring unit is often incorporated as a part of a lithium ion battery. When a lithium ion battery is assembled in a module that incorporates a plurality of cells, it is often incorporated as one component of the module.

The battery capacity measuring unit 10 is connected to the computer 20 through an electric communication line. The battery capacity measured by the battery capacity measuring unit is sent to the computer 20.
The computer 20 stores the battery capacity defined by the specifications in the use of the lithium ion battery as the primary product, and is compared with the received numerical value of the battery capacity (S13).

If the battery capacity received by the computer is compared with the battery capacity defined in the specifications for the primary product, and the received battery capacity is greater than or equal to the battery capacity specified in the specifications for the primary product, it is still the primary product. And the lithium ion battery is used as the primary product, the process returns to step S11.

The battery capacity received by the computer is compared with the battery capacity defined by the specifications of the primary product, and if the received battery capacity is less than the battery capacity defined by the specifications of the primary product, it is determined as a primary product. When it is determined that the lithium ion battery cannot be used, the lithium ion battery as the primary product is disassembled, and the process proceeds to step S2 for taking out the coated active material.

In step S2 of taking out the coated active material, the lithium ion battery as the primary product is disassembled and the coated active material is taken out (S21). The procedure and method for disassembling the lithium-ion battery and taking out the coated active material are not particularly limited, but can be, for example, as follows.
The lithium ion battery is usually covered with an outer container, so the outer container is removed. The outer container is removed to expose the electrode active material layer.
The coated active material in the electrode active material layer is a non-binder that is not solidified with a binder (binder). In this case, in the electrode active material layer, even if the coated active materials contact each other, the coating materials do not irreversibly adhere to each other on the contact surface, and the adhesion is temporary, so the coated active material They are not irreversibly fixed to each other by the coating material and can be disentangled without destroying the coated active material. The electrode active material layer containing the non-binder of the mixture containing the coated active material is not one in which the coated active materials are bound to each other, and the uncoated bound active material is loosened by hand or tool. Can be separated and taken out. Alternatively, the coating active material may be taken out as an active material slurry by pouring the electrolytic solution using a shower nozzle or the like to form a slurry.

The coated active material obtained by disassembling the lithium-ion battery as the primary product and taking it out may be used as it is for the production of the lithium-ion battery as the secondary product.
To use the coated active material as it is means to use it without removing the coating material from the coated active material, and it is permissible to use it after performing the necessary cleaning treatment etc. on the coated active material. To be done.

Also, after the step of disassembling the lithium ion battery as the primary product and taking out the coated active material, the coating material is removed from the taken out coated active material, and the active material particles for lithium ion battery are recoated with the coating material. Therefore, the step of recycling the coated active material may be performed, and the recoated coated active material may be used for manufacturing a lithium ion battery as a secondary product (S4, S41). The surface state of the coated active material may change due to modification of the polymer compound that constitutes the coating material, which may cause a decrease in battery capacity.In such a case, recoating the coating material may reduce the coating activity. The performance of the substance can be restored.
As the method for removing the coating material, a method of dissolving and removing the polymer compound in a solvent capable of dissolving the polymer compound constituting the coating material, or a method of heating the coating active material to a temperature above the burning temperature of the polymer compound Is mentioned.
The method for re-coating the active material can be the same as the method for coating the active material with the coating material in the first step of producing the coated active material.

In step S3 of manufacturing a lithium-ion battery as a secondary product using the coated active material containing the active material taken out from the primary product, the coated active material is used to form a lithium ion battery as a secondary product. A battery is manufactured (S31).
As the coated active material containing the active material taken out from the primary product, the coated active material taken out from the primary product may be used as it is, and the coating material is removed from the coated active material taken out from the primary product, and the coated active material is removed again. A coated active material obtained by recoating the active material particles for a lithium ion battery with a coating material may be used.

When a lithium-ion battery as a secondary product is manufactured using the above coated active material, a lithium-ion battery electrode is manufactured without using a binder like the lithium-ion battery as a primary product. Good. Moreover, you may make it manufacture a lithium ion battery electrode using a binder.

When the lithium ion battery as the secondary product is a lithium ion battery manufactured without using a binder, the lithium ion battery as the secondary product is disassembled in the same manner as the lithium ion battery as the primary product. Further, it can be recycled to manufacture a lithium ion battery as a tertiary product.
In this case, the recycling time may be determined by comparing the battery capacity measured by the battery capacity measuring unit for the lithium ion battery as the secondary product with the battery capacity defined by the specifications as the secondary product.
The battery capacity defined by the specifications of the secondary product is smaller than the battery capacity defined by the specifications of the primary product.

If the lithium-ion battery as a secondary product is further recycled and used as a lithium-ion battery as a tertiary product or a quaternary product, an active material using an expensive metal can be effectively and repeatedly used. Therefore, it is very beneficial from the viewpoint of resource conservation and economical viewpoint.

Further, in connection with the active material recycling system of the present invention, a framework for securitizing the ownership of the coated active material in order to mitigate the influence of the price fluctuation of the expensive active material on the manufacturer and the user of the lithium ion battery. It is also preferable to utilize.
For example, a manufacturer of a lithium ion battery as a primary product securitizes the ownership of the coated active material and raises funds, and a user who purchases and uses a lithium ion battery as a primary product is a lithium ion battery. After the battery is used, the recycling of the lithium-ion battery is entrusted to the active material recycling system, and the manufacturer of the lithium-ion battery as a secondary product purchases the ownership of the securitized coated active material or is securitized. It is preferable to obtain a leased right of the coated active material and manufacture a lithium ion battery as a secondary product.

A manufacturer of a lithium-ion battery as a primary product can securitize the ownership of the coated active material and raise funds. By securitizing the ownership of the coated active material, it is preferable that the purchaser of the security (an investor such as a bank or an insurance company) bears part of the cost of purchasing the active material. Since the purchaser of the securities bears a part of the cost, the manufacturer of the lithium-ion battery uses the active material at a price substantially lower than the market price to manufacture the lithium-ion battery as the primary product. You can

The manufacturer of the lithium-ion battery as the primary product can procure the active material at a price lower than the market price, so that the selling price of the lithium-ion battery can be reduced.
A user of a lithium-ion battery as a primary product can purchase and use the lithium-ion battery at a low price. Here, since the purchaser of the security has the ownership of the coated active material, the user of the lithium-ion battery does not have the ownership of the coated active material. You are in a state of borrowing a substance. Therefore, the user of the lithium-ion battery as the primary product will somehow pay the purchaser of the securities.
As an index to pay the cost, the method of using the cost according to the usage period such as monthly cost, the benefit obtained by using the lithium-ion battery (for example, the amount of power used, the distance traveled for in-vehicle use, etc.) There is a method of paying the cost according to the index).
By doing so, the purchaser of the security can enjoy the profit.

A user of a lithium-ion battery as a primary product shall be advised that if the battery capacity measured when using the lithium-ion battery is less than the battery capacity specified in the specifications for the application of the lithium-ion battery as a primary product. Entrusts the recycling of lithium-ion batteries to the active material recycling system.
The user of the lithium-ion battery as the primary product substantially returns the coated active material by entrusting the recycling.

Recycling is performed by the manufacturer of the lithium-ion battery as the primary product, the user of the lithium-ion battery as the primary product, the manufacturer of the lithium-ion battery as the secondary product, or another third party. (Person who only recycles).
Specifically, the recycler disassembles the lithium ion battery as the primary product and takes out the coated active material. The recycler may remove the coating material from the taken-out coated active material and recoat the active material with the coating material.
In the following description, regarding the coated active material containing the active material taken out from the primary product, the coated active material in the case where the taken coated active material is used as it is and the coated active material obtained by re-coating the active material with the coating material are described. The coated active materials when used are collectively referred to as “recycled coated active material”.
The recycler can obtain the operation cost for recycling from the purchaser of the securities (owner of the coated active material).

When a user of a lithium-ion battery as a primary product carries out recycling, the lithium-ion battery is disassembled after use of the lithium-ion battery, the coated active material is taken out, and the recycled coated active material is returned to the market.
When the manufacturer of the lithium-ion battery as the primary product or another third party (those who only recycle) carries out the recycling, the user of the lithium-ion battery as the primary product is the owner of the coated active material. The lithium-ion battery as the primary product returned to the company is obtained, the lithium-ion battery is disassembled after the use of the lithium-ion battery, the coated active material is taken out, and the recycled coated active material is returned to the market.

The manufacturer of the lithium-ion battery as a secondary product purchases the ownership of the securitized coated active material or obtains the leased right of the securitized coated active material to obtain a lithium-ion battery as a secondary product. Manufacture batteries.
If the lithium-ion battery as the secondary product is the final application, it is preferable to purchase the ownership of the coated active material, but it is planned to further use the coated active material for the lithium-ion battery as the tertiary product. If so, it is preferable to obtain the lease right of the securitized coated active material.
In addition, when a manufacturer of a lithium-ion battery as a secondary product recycles, it purchases the ownership of the securitized coated active material or obtains a lease right of the securitized coated active material. After that, a lithium-ion battery as a primary product is obtained, disassembled and the coated active material is taken out, and a lithium-ion battery as a secondary product is manufactured using the recycled coated active material.

Manufacturers of lithium-ion batteries as secondary products can manufacture lithium-ion batteries at a lower cost than when purchasing new active materials from the market to manufacture lithium-ion batteries.
Due to its application, it is not necessary to use a new active material for the lithium-ion battery as a secondary product, and the value of the battery capacity can meet the specifications even if a recycled coated active material is used. Recycled coated active materials that are inexpensive can be used.

Under this framework, securities buyers bear the benefits and risks of price fluctuations of active materials. If the market price of the active material is higher than when the security was purchased, the security price will rise, so you can make a profit by selling the security, but if the market price of the active material is lower than when the security was purchased. Will suffer a loss because the security price will also fall.

Further, the purchaser of the security can be paid for the use of the lithium-ion battery using the coated active material according to the security.
When the use of the lithium ion battery as the final product is finished, the value of the coated active material in the security becomes substantially zero. Therefore, the price of the security is virtually zero.
Therefore, from the lithium-ion battery as the primary product to the lithium-ion battery as the final product, the amount of expenses paid from the start to the end of use of the coated active material should be higher than the purchase price of the securities. By setting the price related to the use of the substance, the purchaser of the security can surely make a profit.

Each company participating in this framework can obtain the following merits.
A manufacturer of a lithium-ion battery as a primary product can procure an active material at a price lower than a market price to manufacture a lithium-ion battery.
Users of the lithium-ion battery as the primary product can procure the lithium-ion battery at a price lower than the market price.
Manufacturers of lithium-ion batteries as secondary products can procure the coated active material at a price lower than the market price to manufacture lithium-ion batteries.
And each business operator can reduce the risk associated with the price fluctuation of the active material.
Further, an investor who purchases the ownership of the securitized coated active material can be paid for the use of the coated active material in the process of being recycled and used.
That is, each of the businesses participating in this framework can enjoy the benefits of recycling the coated active material.

Since the active material recycling system of the present invention can effectively use an active material using an expensive metal as the active material of a lithium ion battery multiple times, it is very useful from the viewpoint of resource protection and economical viewpoint. It is useful.

10 Battery Capacity Measuring Unit 20 Computer

Claims (6)

An active material comprising a coated active material in which active material particles for a lithium ion battery are coated with a coating material, and the coated active material in a lithium ion battery including an electrode active material layer composed of a non-bound body of the coated active material is repeatedly used. A recycling system,
Regarding a lithium ion battery as a primary product, a battery capacity measuring unit that measures the battery capacity and a computer that determines the recycling time are connected through an electric communication line, and the battery capacity measured by the battery capacity measuring unit is Using the recycle time determination means for determining the recycle time by comparing the battery capacity sent to the computer and received by the computer with the battery capacity defined in the specifications as the primary product, the primary product is used. To determine when to recycle the lithium-ion battery as
Disassembling the lithium-ion battery as the primary product and taking out the coated active material,
A step of producing a lithium ion battery as a secondary product by using the coated active material containing the active material taken out from the primary product, the active material recycling system. The active material recycling system according to claim 1, wherein the usage of the lithium ion battery as the primary product and the usage of the lithium ion battery as the secondary product are different. The active material recycling system according to claim 2, wherein the use of the lithium-ion battery as the primary product is in-vehicle use. After disassembling the lithium ion battery as the primary product and taking out the coated active material, the coating material is removed from the taken out coated active material, and the active material particles for lithium ion battery are recoated with the coating material again. The active material recycling system according to any one of claims 1 to 3, wherein the step of recycling the coated active material is performed, and the recoated coated active material is used for manufacturing a lithium ion battery as a secondary product. The lithium ion battery as the primary product is disassembled, and after the step of taking out the coated active material, the taken out coated active material is used as it is for the production of a lithium ion battery as a secondary product. Active material recycling system described in. The manufacturer of the lithium-ion battery as the primary product securitizes the ownership of the coated active material and raises funds,
The user who purchases and uses the lithium-ion battery as the primary product entrusts the recycling of the lithium-ion battery to the active material recycling system after using the lithium-ion battery,
The manufacturer of the lithium-ion battery as a secondary product purchases the ownership of the securitized coated active material or obtains the leased right of the securitized coated active material to obtain a lithium-ion battery as a secondary product. The active material recycling system according to claim 1, which manufactures a battery.

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