JP7393860B2 - Active material recycling system - Google Patents

Description

The present invention relates to an active material recycling system.

Lithium ion (secondary) batteries are high-capacity, small-sized, lightweight secondary batteries that have been widely used in a variety of applications in recent years. In a typical 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 similarly containing a negative electrode active material, a binder resin, and an electrolytic solution are stacked with a separator in between. The device is configured such that it is housed in a container in a state of being closed (for example, see Patent Document 1).

Nickel oxide and cobalt oxide are used as the material for the positive electrode active material. These metals are expensive, and their prices are subject to large fluctuations because their reserves are limited.
Therefore, it is desired to stably manufacture lithium ion batteries by recycling and using active materials containing these metals.

JP2006-324118A

In conventional lithium ion batteries, the positive electrode active material layer and the negative electrode active material layer contain a binder resin, and the binder resin solidifies the positive electrode active material layer and the negative electrode active material layer, and the active material layer acts as a current collector. It has been difficult to remove the active material from the lithium ion battery because it is strongly bound to the lithium ion battery.

Furthermore, even if it were possible to extract the active material from such a lithium ion battery, the cost required to extract it was high, making it impractical to construct a system that included recycling.

In addition, even if active materials are recycled, the battery capacity of batteries manufactured using recycled active materials may be lower than that of new batteries, and the battery capacity of batteries manufactured using recycled active materials may be lower than that of new batteries. It may not be possible to use it for the same purpose.
Therefore, there has been a need for a method for effectively using recycled batteries manufactured using recycled active materials.

The present invention has been made in order to solve the above problems, and provides an active material recycling system that can effectively utilize active materials using expensive metals by repeatedly reusing them multiple times. The goal is

The active material recycling system of the present invention provides a coating in a lithium ion battery in which active material particles for a lithium ion battery include a coated active material coated with a coating material, and an electrode active material layer consisting of a non-binding body of the coated active material. An active material recycling system that repeatedly uses active materials,
For lithium-ion batteries as primary products, a battery capacity measurement unit that measures battery capacity and a computer that determines when to recycle are connected through a telecommunications line, and the battery capacity measured by the battery capacity measurement unit is The primary product is sent to a computer and is sent to the computer, and the recycling time determination means determines the recycling time by comparing the battery capacity received by the computer with the battery capacity specified in the specifications for the primary product. Steps to determine when to recycle lithium-ion batteries,
a step of disassembling the lithium ion battery as the primary product and taking out the coated active material;
The present invention is characterized by comprising the step of manufacturing a lithium ion battery as a secondary product using a 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 effectively utilize an active material using an expensive metal by repeatedly reusing it multiple times.

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

The present invention will be explained in detail below.
In addition, in this specification, when describing a lithium ion battery, it is a concept that also includes a lithium ion secondary battery.

The active material recycling system of the present invention provides a coating in a lithium ion battery in which active material particles for a lithium ion battery include a coated active material coated with a coating material, and an electrode active material layer consisting of a non-binding body of the coated active material. This is an active material recycling system that repeatedly uses active materials, and for lithium ion batteries as the primary product, a battery capacity measurement unit that measures the battery capacity and a computer that determines when to recycle are connected through a telecommunications line. The battery capacity measured by the battery capacity measuring section is sent to the computer, and the computer compares the battery capacity received with the battery capacity specified in the specifications for the primary product to determine when it is time to recycle. a step of determining the recycle time of the lithium ion battery as the primary product using a recycling time determining means; a step of disassembling the lithium ion battery as the primary product and taking out the coated active material; The present invention is characterized by comprising the step of manufacturing a lithium ion battery as a secondary product using a coated active material containing an active material taken out from a secondary product.

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

As the active material particles for lithium ion batteries, particles of a positive electrode active material for lithium ion batteries or a negative electrode active material for lithium ion batteries can be used.
As positive electrode active materials for lithium ion batteries, composite oxides of lithium and transition metals {complex oxides containing one type of transition metal (LiCoO ₂ , LiNiO ₂ , LiAlMnO ₄ , LiMnO ₂ and LiMn ₂ O ₄ , etc.); Composite oxides containing two types of 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 composite oxide containing three or more types of metal elements [for example, LiM _a M' _b M'' _c O ₂ (M, M' and M'' are each lithium-containing transition metal phosphates ( _{e.g. ,} LiFePO ₄ , _{LiCoPO 4 ,} LiMnPO ₄ and LiNiPO ₄ ), transition metal oxides (e.g. MnO ₂ and V ₂ O ₅ ), transition metal sulfides (e.g. MoS ₂ and TiS ₂ ) and conductive polymers (e.g. polyaniline, polyvinylidene fluoride, polypyrrole, polythiophene, (polyacetylene, poly-p-phenylene, polycarbazole), etc., and two or more types may be used in combination.
Note that the lithium-containing transition metal phosphate may be one in which some of the transition metal sites are replaced with another transition metal.

Negative electrode active materials for lithium ion batteries include carbon-based materials [graphite, non-graphitizable carbon, amorphous carbon, fired resin bodies (e.g. carbonized carbonized materials such as phenol resins and furan resins), cokes (e.g. pitch coke, needle coke, petroleum coke, etc.) and carbon fibers], silicon-based materials [silicon, silicon oxide (SiOx), silicon-carbon composites (carbon particles whose surfaces are coated with silicon and/or silicon carbide, silicon particles or silicon oxide particles whose surfaces are coated with carbon and/or silicon carbide, silicon carbide, etc.) and silicon alloys (silicon-aluminum alloys, silicon-lithium alloys, silicon-nickel alloys, silicon-iron alloys, silicon- titanium alloys, silicon-manganese alloys, silicon-copper alloys, silicon-tin alloys, etc.), conductive polymers (e.g. polyacetylene and polypyrrole, etc.), metals (tin, aluminum, zirconium, titanium, etc.), metal oxides ( Examples include titanium oxides and lithium titanium oxides), metal alloys (for example, lithium-tin alloys, lithium-aluminum alloys, and lithium-aluminum-manganese alloys), and mixtures of these with carbon-based materials.
Among the negative electrode active materials for lithium ion batteries, those that do not contain lithium or lithium ions may be subjected to a pre-doping treatment in which part or all of the negative electrode active material contains lithium or lithium ions.

The coating material includes a polymer compound.
Moreover, it is preferable that the coating material further contains a conductive agent.
A coated active material in which the periphery of the active material for a lithium ion battery is coated with a coating material can reduce volume change of the active material particles and suppress expansion of the electrode.

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

The vinyl resin (A) is a resin comprising a polymer (A1) having the vinyl monomer (a) as an essential constituent monomer.
In particular, the polymer (A1) preferably contains, as the vinyl monomer (a), a vinyl monomer (a1) having a carboxyl group or an acid anhydride group, or a vinyl monomer (a2) represented by the following general formula (2). .
CH ₂ =C(R ¹ )COOR ² (2)
[In formula (2), R ¹ is a hydrogen atom or a methyl group, and R ² is a straight chain 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 in a saturated liquid absorption state of 10% or more are more preferable.

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

In the vinyl monomer (a2) represented by the above general formula (2), R ¹ represents a hydrogen atom or a methyl group. Preferably, R ¹ is a methyl group.
R ² is preferably a straight chain 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 straight chain or branched alkyl group having 4 to 12 carbon atoms Examples of straight chain alkyl groups having 4 to 12 carbon atoms include butyl group, pentyl group, hexyl group, heptyl group, octyl group, Examples include nonyl group, decyl group, undecyl group, and dodecyl group.
Examples of branched alkyl groups 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-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-methyldecyl 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 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, 2-ethylnonyl group, 1-methylundecyl group, 2-methylundecyl group, 3-methylundecyl group, 4-methylundecyl group, 5-methylundecyl group, 6-methylundecyl group 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 group, 1-ethyldecyl group, 2-ethyldecyl group, etc.

(a22) Ester compound in which R ² is a branched alkyl group having 13 to 36 carbon atoms The branched alkyl group having 13 to 36 carbon atoms includes a 1-alkylalkyl group [1-methyldodecyl group, 1-butyleicosyl group, 1-hexyloctadecyl group, 1-octylhexadecyl group, 1-decyltetradecyl group, 1-undecyltridecyl group, etc.], 2-alkylalkyl group [2-methyldodecyl group, 2-hexyloctadecyl group, 2- Octylhexadecyl group, 2-decyltetradecyl group, 2-undecyltridecyl group, 2-dodecylhexadecyl group, 2-tridecylpentadecyl group, 2-decyloctadecyl group, 2-tetradecyloctadecyl group, 2- hexadecyl octadecyl group, 2-tetradecyl eicosyl group, 2-hexadecyl eicosyl group, etc.], 3-34-alkylalkyl group (3-alkylalkyl group, 4-alkylalkyl group, 5-alkylalkyl group, 32 -alkylalkyl group, 33-alkylalkyl group, 34-alkylalkyl group, etc.), propylene oligomer (7-11mer), ethylene/propylene (molar ratio 16/1-1/11) oligomer, isobutylene oligomer ( One or more branched alkyl groups, such as residues obtained by removing the hydroxyl group from oxo alcohols obtained from α-olefins (7- to 8-mer) and α-olefin (5-20 carbon atoms) oligomers (4- to 8-mer), etc. Examples include mixed alkyl groups.

It is preferable that the polymer (A1) further contains an ester compound (a3) of a monovalent aliphatic alcohol having 1 to 3 carbon atoms and (meth)acrylic acid.
Examples of the monovalent aliphatic alcohol having 1 to 3 carbon atoms constituting 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 15 to 55% by weight, based on the total weight of the polymer (A1), from the viewpoint of suppressing volume change of the positive electrode active material. More preferably, the amount is 20 to 50% by weight.

Moreover, it is preferable that the polymer (A1) 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.
Anionic monomers having a polymerizable unsaturated double bond and an anionic group are compounds obtained by a combination of these, and include, for example, vinylsulfonic acid, allylsulfonic acid, styrenesulfonic acid, and (meth)acrylic acid. It will be done.
In addition, a (meth)acryloyl group means an acryloyl group and/or a methacryloyl group.
Examples of the cations constituting the anionic monomer salt (a4) include lithium ions, sodium ions, potassium ions, and ammonium ions.

The content of the anionic monomer salt (a4) is preferably 0.1 to 15% by weight, based on the total weight of the polymer compound, from the viewpoint of internal resistance, etc., and 1 to 15% by weight. 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 contains an ester compound (a3), and further contains a salt of an anionic monomer ( Particularly preferred is a4).

The polymer compound includes (meth)acrylic acid (a11), an ester compound (a21) represented by the following general formula (1), and an ester of a monohydric aliphatic alcohol having 1 to 3 carbon atoms and (meth)acrylic acid. The above ester compound (a21) is obtained by polymerizing a monomer composition comprising a compound (a3) and a salt (a4) of an anionic monomer having a polymerizable unsaturated double bond and an anionic group. The weight ratio of the above (meth)acrylic acid (a11) [the above ester compound (a21)/the above (meth)acrylic acid (a11)] is preferably 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 straight chain or branched alkyl group having 4 to 12 carbon atoms. ]
When the weight ratio of the ester compound (a21) and (meth)acrylic acid (a11) is 10/90 to 90/10, the polymer obtained by polymerizing them has good adhesion to the positive electrode active material and can be peeled off. It becomes difficult to do.
The weight ratio is preferably 30/70 to 85/15, more preferably 40/60 to 70/30.

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

(a52) Poly(n=2-30) oxyalkylene (carbon number 2-4) alkyl (carbon number 1-18) ether (meth)acrylate [10 mol adduct of methanol with ethylene oxide (hereinafter abbreviated as EO) (meth) ) acrylate, 10 mole adduct of methanol with propylene oxide (hereinafter abbreviated as PO) (meth)acrylate, etc.]

(a53) Nitrogen-containing vinyl compound (a53-1) Vinyl compound containing amide group (i) (meth)acrylamide compound having 3 to 30 carbon atoms, such as N,N-dialkyl (1 to 6 carbon atoms) or dialkyl (carbon number 7-15) (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 compounds Vinyl compounds, such as N-methyl-N-vinylacetamide, cyclic amides [pyrrolidone compounds (6 to 13 carbon atoms, such as N-vinylpyrrolidone)]

(a53-2) (meth)acrylate compound (i) Dialkyl (1 to 4 carbon atoms) Aminoalkyl (1 to 4 carbon atoms) (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 {tertiary amino group-containing (meth)acrylate [N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, etc.] compounds (quaternized using a quaternizing agent such as methyl chloride, dimethyl sulfate, benzyl chloride, dimethyl carbonate, etc.), etc.}

(a53-3) Heterocycle-containing vinyl compounds, pyridine compounds (7 to 14 carbon atoms, e.g. 2- or 4-vinylpyridine), imidazole compounds (5 to 12 carbon atoms, e.g. N-vinylimidazole), pyrrole compounds (carbon atoms 6-13 carbon atoms, e.g. N-vinylpyrrole), pyrrolidone compounds (6-13 carbon atoms, e.g. N-vinyl-2-pyrrolidone)

(a53-4) Nitrile group-containing vinyl compound Nitrile group-containing vinyl compound having 3 to 15 carbon atoms, such as (meth)acrylonitrile, cyanostyrene, cyanoalkyl (1 to 4 carbon atoms) acrylate

(a53-5) Other nitrogen-containing vinyl compounds Nitro group-containing vinyl compounds (8 to 16 carbon atoms, such as nitrostyrene), etc.

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

(a54-2) Alicyclic vinyl hydrocarbon Cyclic unsaturated compounds having 4 to 18 or more carbon atoms, such as cycloalkenes (e.g. cyclohexene), (di)cycloalkadienes [e.g. (di)cyclopentadiene], terpenes ( e.g. pinene and limonene), indene

(a54-3) Aromatic vinyl hydrocarbon Aromatic unsaturated compounds having 8 to 20 carbon atoms or more, such as styrene, α-methylstyrene, vinyltoluene, 2,4-dimethylstyrene, ethylstyrene, isopropylstyrene, butyl Styrene, phenylstyrene, cyclohexylstyrene, benzylstyrene

(a55) Vinyl ester aliphatic vinyl ester [carbon number 4-15, e.g. alkenyl ester of aliphatic carboxylic acid (mono- or dicarboxylic acid) (e.g. vinyl acetate, vinyl propionate, vinyl butyrate, diallyl adipate, isopropenyl acetate, vinyl methoxy acetate)]
Aromatic vinyl esters [9 to 20 carbon atoms, such as alkenyl esters of aromatic carboxylic acids (mono- or dicarboxylic acids) (such as vinyl benzoate, diallyl phthalate, methyl-4-vinyl benzoate), aromatic ring-containing aliphatic carboxylic acids ester (e.g. acetoxystyrene)]

(a56) Vinyl ether aliphatic vinyl ether [3 to 15 carbon atoms, such as vinyl alkyl (1 to 10 carbon atoms) ether (vinyl methyl ether, vinyl butyl ether, vinyl 2-ethylhexyl ether, etc.), vinyl alkoxy (1 to 6 carbon atoms) Alkyl (1-4 carbon atoms) 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) (diallyloxyethane, triaryloxyethane, tetraallyloxybutane, tetramethallyloxyethane, etc.)], Aromatic vinyl ether (8 to 20 carbon atoms, e.g. vinyl phenyl ether, phenoxystyrene)

(a57) Vinyl ketone Aliphatic vinyl ketone (4 to 25 carbon atoms, e.g. vinyl methyl ketone, vinyl ethyl ketone), aromatic vinyl ketone (9 to 21 carbon atoms, e.g. vinyl phenyl ketone)

(a58) Unsaturated dicarboxylic acid diester Unsaturated dicarboxylic acid diester having 4 to 34 carbon atoms, such as dialkyl fumarate (two alkyl groups are linear, branched, 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 those 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 above general formula (2), a monovalent aliphatic alcohol having 1 to 3 carbon atoms; and (meth)acrylic acid (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, based on the weight of the polymer (A1), (a1) is 0.1 to 80% by weight, (a2) is 0.1 to 99.9% by weight, and (a3) is 0 to 80% by weight. 60% by weight, (a4) preferably from 0 to 15% by weight, and (a5) from 0 to 99.8% by weight.
When the content of the monomer is within the above range, the liquid absorption property to the electrolytic solution will be good.
More preferable contents are 15 to 60% by weight of (a1), 5 to 60% by weight of (a2), 10 to 60% by weight of (a3), 0.1 to 15% by weight of (a4), and (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, even more preferably 100,000, particularly preferably 200,000, and the preferable upper limit is 2,000,000, more preferably Preferably it is 1,500,000, more preferably 1,000,000, particularly preferably 800,000.

The number average molecular weight of the polymer (A1) can be determined by gel permeation chromatography (hereinafter abbreviated as GPC) under the following conditions.
Equipment: Alliance GPC V2000 (manufactured by Waters)
Solvent: Orthodichlorobenzene Standard material: Polystyrene Detector: RI
Sample concentration: 3mg/ml
Column stationary phase: PLgel 10μm, 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.).
During polymerization, known polymerization initiators {azo initiators [2,2'-azobis(2-methylpropionitrile), 2,2'-azobis(2,4-dimethylvaleronitrile, etc.)], peroxide This can be carried out using a system initiator (benzoyl peroxide, di-t-butyl peroxide, lauryl peroxide, etc.).
The amount of the polymerization initiator used is preferably 0.01 to 5% by weight, more preferably 0.05 to 2% by weight, even more preferably 0.1 to 1.5% by weight, based on the total weight of the monomers. .

Solvents used in solution polymerization include, for example, esters (with 2 to 8 carbon atoms, such as ethyl acetate and butyl acetate), alcohols (with 1 to 8 carbon atoms, such as methanol, ethanol and octanol), hydrocarbons (with 1 to 8 carbon atoms, such as methanol, ethanol and octanol), 4-8, e.g. The monomer concentration is preferably 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 even more preferably 30 to 80% by weight.

Dispersion media in emulsion polymerization and suspension polymerization include water, alcohol (e.g. ethanol), ester (e.g. ethyl propionate), light naphtha, etc., and emulsifiers include higher fatty acid (carbon number 10-24) metal salts. (e.g. sodium oleate and sodium stearate), higher alcohol (10-24 carbon atoms) sulfate ester metal salt (e.g. sodium lauryl sulfate), ethoxylated tetramethyldecynediol, sodium sulfoethyl methacrylate, dimethylaminomethyl methacrylate, etc. can be mentioned. Furthermore, polyvinyl alcohol, polyvinylpyrrolidone, etc. 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, even more preferably 15 to 85% by weight, and the amount of the polymerization initiator used is based on the total weight of the monomers. The amount is preferably 0.01 to 5% by weight, more preferably 0.05 to 2% by weight.
During 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, even more preferably 0.3% by weight or less, based on the total weight of the monomers.

Next, the conductive agent contained in the coating material will be explained.
The conductive agent contained in the coating material is selected from materials that have conductivity.
Specifically, metals [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.] ], mixtures thereof, etc., but are not limited thereto.
These conductive agents may be used alone or in combination of two or more. Further, alloys or metal oxides of these may also be used. From the viewpoint of electrical stability, aluminum, stainless steel, carbon, silver, copper, titanium, and mixtures thereof are preferred, silver, aluminum, stainless steel, and carbon are more preferred, and carbon is still more preferred. Further, these conductive agents may be ones in which a particulate ceramic material or a resin material is coated with a conductive material (metal among the above-mentioned conductive agent materials) 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 0.01 to 10 μm, more preferably 0.02 to 5 μm. More preferably, the thickness is 0.03 to 1 μm. In addition, in this specification, "particle diameter" means the maximum distance L among the distances between any two points on the outline of the conductive agent. The value of "average particle diameter" is the average value of the particle diameter of particles observed in several to several dozen fields of view using 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 in a form other than the particle form, and may be in 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.
Examples of conductive fibers include carbon fibers such as PAN-based carbon fibers and pitch-based carbon fibers, conductive fibers made by uniformly dispersing highly conductive metals or graphite in synthetic fibers, and metals such as stainless steel. Examples include fibrous metal fibers, conductive fibers in which the surface of organic fibers is coated with metal, and conductive fibers in which the surface of organic fibers is coated with resin containing a conductive substance. Among these conductive fibers, carbon fibers are preferred. Further, polypropylene resin kneaded with graphene is also preferable.
When the conductive agent is a conductive fiber, the average fiber diameter is preferably 0.1 to 20 μm.

The coated active material for lithium ion batteries may be manufactured by mixing a polymer compound, a conductive agent, and an active material for lithium ion batteries, and after preparing the coating material by mixing the polymer compound and the conductive agent. , it may be manufactured by mixing the coating material and an active material for a lithium ion battery.
In addition, when mixing the active material for lithium ion batteries, the polymer compound, and the conductive agent, there is no particular restriction on the mixing order.

The coated active material for lithium ion batteries can be prepared by, for example, placing the active material for lithium ion batteries in a universal mixer and stirring at 30 to 50 rpm, and then dropwise mixing a polymer solution containing a polymer compound over 1 to 90 minutes. It can be obtained by further mixing a conductive agent, raising the temperature to 50 to 200° C. while stirring, reducing the pressure to 0.007 to 0.04 MPa, and holding for 10 to 150 minutes.

When using the coated active material for lithium ion batteries as an electrode active material layer, the coated active material for lithium ion batteries and the conductive material are mixed in an amount of 30 to 60% by weight based on the weight of the dispersion medium (water, electrolyte, or solvent). After applying the dispersion liquid, which is made into a slurry by dispersing it at a concentration, to the current collector using a coating device such as a bar coater, and drying it if water or a solvent is used as the dispersion medium, the electrolyte solution can be used as the dispersion medium. When used, the dispersion medium may be removed by absorbing the excess electrolyte into an absorbent such as a sponge or suctioning through a mesh, and pressing with a press if necessary.
It is preferable that an electrode binder is not added to the dispersion. 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 within the electrode with an electrode binder. However, when a coated active material for lithium ion batteries is used, the conductive path can be maintained without fixing the active material within the electrode due to the action of the coating material, so there is no need to add an electrode binder. By not adding an electrode binder, the active material is not immobilized within the electrode active material layer, so that the ability to relax the volume change of the active material becomes even better.
It can be said that the electrode active material layer obtained in this manner consists of a non-bound body of the coated active material.
Note that the conductive material used for manufacturing the electrode active material layer is separate from the conductive agent included in the coating material, and is present outside the coating material of the coating active material. It has the function of improving the electronic conductivity of

When producing a lithium ion battery using an electrode active material layer containing a coated active material for lithium ion batteries, a counter electrode is combined and housed together with a separator in a cell container, an electrolyte is injected, and the cell container is It can be manufactured by a method such as sealing.
In addition, a positive electrode is formed on one side of the current collector and a negative electrode is formed on the other side to create a bipolar electrode, and the bipolar electrode is laminated with a separator and housed in a cell container, and the electrolyte is poured into the cell container. It can also be obtained by injecting it and sealing the cell container.

Separators include microporous films made of polyethylene or polypropylene, multilayer films of porous polyethylene and polypropylene, nonwoven fabrics made of polyester fibers, aramid fibers, glass fibers, etc., and silica, alumina, titania, etc. on their surfaces. Examples include known separators for lithium ion batteries, such as those having ceramic fine particles attached thereto.

As the electrolytic solution injected into the cell container, a known electrolytic solution containing an electrolyte and a non-aqueous solvent, which is used in the production of known lithium ion batteries, can be used.

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

As the non-aqueous solvent, those used in known electrolytes can be used, such as lactone compounds, cyclic or chain carbonates, chain carboxylic esters, cyclic or chain ethers, phosphate 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 even more preferably 2 to 3 mol/L.
If 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 if it exceeds 5 mol/L, the electrolyte may precipitate.
Note that the electrolyte concentration of the electrolyte solution can be confirmed by extracting the electrolyte solution constituting the lithium ion battery electrode or the lithium ion battery without using a solvent or the like, and measuring the concentration.

The active material to be recycled in the active material recycling system of the present invention may be either the positive electrode active material or the negative electrode active material, but since it is effective to recycle expensive active materials, the active material to be recycled is the positive electrode active material. It is preferable to
The following description assumes that the active material is an expensive positive electrode active material, but the negative electrode active material may also be used.

The use of a lithium ion battery as a primary product is not particularly limited, but it can be used in applications that require a large battery capacity per unit volume. Examples include in-vehicle applications and mobile terminals (laptops, tablets, smartphones, mobile phones, etc.).
In particular, in in-vehicle applications, as the number of electric vehicles, hybrid vehicles, plug-in hybrid vehicles, etc. increases, it is expected that many lithium ion batteries will be used to drive these vehicles. For this reason, it is desired to recycle lithium ion batteries used for in-vehicle applications, and therefore it is more preferable to use them for in-vehicle applications.
As a primary product, it is preferable that the battery capacity is required to be 300Wh/L or more.
Lithium ion batteries used for automotive applications may be assembled into modules incorporating multiple cells.

The use of lithium-ion batteries as secondary products is not particularly limited, but after recycling, the battery capacity per unit volume will be smaller than that of the primary product, so the required battery capacity per unit volume will be lower than that of the primary product. It is preferable to use it in applications where the capacity may be smaller than that of the primary product.
Examples include stationary power supplies for home and commercial use, and emergency power supplies.
As a secondary product, it is preferable that the application requires a battery capacity of 200Wh/L or more. Further, it may be used for applications where the battery capacity may be less than 200Wh/L.

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

FIG. 1 is a flowchart showing the process flow of the active material recycling system.
In the active material recycling system, in step S1 for determining the recycling time, the expiration date for use as a primary product is determined as follows.
First, a lithium ion battery is used as a primary product (S11).
Lithium ion batteries are used by repeatedly charging and discharging (battery usage).
When charging the lithium ion battery, the battery capacity is measured in the battery capacity measuring section 10 (S12).
A battery capacity measuring section is often incorporated as a component of a lithium ion battery. When a lithium ion battery is assembled into a module that incorporates a plurality of cells, it is often incorporated as one component of the module.

The battery capacity measuring section 10 is connected to the computer 20 through a telecommunications line. The battery capacity measured by the battery capacity measuring section is sent to the computer 20.
The computer 20 stores the battery capacity defined in the specifications for the use of the lithium ion battery as a primary product, and compares it with the received battery capacity value (S13).

The computer compares the received battery capacity with the battery capacity specified in the specifications as a primary product, and if the received battery capacity is greater than or equal to the battery capacity specified in the specifications as a primary product, it is still a primary product. It is determined that the lithium ion battery can be used as the primary product, and the process returns to step S11 where the lithium ion battery is used as the primary product.

The computer compares the received battery capacity with the battery capacity specified in the specifications as a primary product, and if the received battery capacity is less than the battery capacity specified in the specifications as a primary product, it is considered as a primary product. It is determined that the battery cannot be used, and the process moves to step S2 in which the lithium ion battery as a primary product is disassembled and the coated active material is taken out.

In step S2 of taking out the coated active material, the lithium ion battery as a 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 performed as follows, for example.
Lithium ion batteries are usually covered with an outer container, so remove the outer container. The outer container is removed to expose the electrode active material layer.
The coated active material in the electrode active material layer consists of a non-bound body that is not hardened with a binder (binder). In this case, even if the coated active materials come into contact with each other in the electrode active material layer, the coated active materials will not irreversibly adhere to each other at the contact surface, and the adhesion is temporary. They are not irreversibly fixed to each other by the coating material, and can be loosened without destroying the coating active material. An electrode active material layer containing a non-bound substance of a mixture containing a coated active material is one in which the coated active materials are not bound to each other, and the coated active material, which is a non-bound body, is loosened by hand or with a tool. It can be separated and taken out. Alternatively, the coated active material may be taken out as a slurry by pouring an electrolytic solution using a shower nozzle or the like.

The coated active material taken out by disassembling a lithium ion battery as a primary product may be used as it is for manufacturing a lithium ion battery as a secondary product.
Using the coated active material as is means using it without removing the coating material from the coated active material, and it is permissible to use the coated active material after performing necessary cleaning treatments. be done.

In addition, after the step of disassembling the lithium ion battery as a primary product and taking out the coated active material, the coating material is removed from the coated active material taken out, and the active material particles for lithium ion battery are recoated with the coating material again. By doing so, a step of recycling the coated active material may be performed, and the re-coated coated active material may be used for manufacturing a lithium ion battery as a secondary product (S4, S41). The surface condition of the coated active material may change due to denaturation of the polymer compound that makes up the coating material, which may cause a decrease in battery capacity. Can restore the performance of substances.
Methods for removing the coating material include a method of dissolving and removing the polymer compound in a solvent that can dissolve the polymer compound constituting the coating material, and a method of heating the coating active material to a temperature higher than the burnout temperature of the polymer compound. can be mentioned.
The method for recoating the active material can be the same as the method for covering the active material with a coating material in the first manufacturing process of the coated active material.

In step S3 of manufacturing a lithium ion battery as a secondary product using a coated active material including the active material taken out from the primary product, the coated active material is used to produce 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, or the coating material may be removed from the coated active material taken out from the primary product and then the coated active material taken out from the primary product may be used again. A coated active material obtained by re-coating active material particles for lithium ion batteries with a coating material may also be used.

When manufacturing a lithium ion battery as a secondary product using the above-mentioned coated active material, the electrode for the lithium ion battery is manufactured without using a binder, similar to the lithium ion battery as a primary product. Good too. Alternatively, a binder may be used to manufacture the electrode for a lithium ion battery.

If the lithium ion battery as a secondary product is a lithium ion battery manufactured without using a binder, the lithium ion battery as a secondary product must be disassembled in the same way as the lithium ion battery as a primary product. Furthermore, recycling can be performed to produce lithium ion batteries as tertiary products.
In this case, the recycling time may be determined by comparing the battery capacity of the lithium ion battery as a secondary product measured by the battery capacity measurement unit with the battery capacity defined in the specifications for the secondary product.
The battery capacity specified in the specifications as a secondary product is smaller than the battery capacity specified in the specifications as a primary product.

If a lithium-ion battery as a secondary product is further recycled and used as a lithium-ion battery as a tertiary product, then a tertiary product, and then a lithium-ion battery as a quaternary product, active materials made of expensive metals can be used effectively and multiple times. Therefore, it is very beneficial from the viewpoint of resource conservation and from the economic viewpoint.

In addition, in connection with the active material recycling system of the present invention, a framework for securitizing the ownership of coated active materials is provided in order to alleviate the impact on lithium ion battery manufacturers and users due to price fluctuations of expensive active materials. It is also preferable to use
For example, a manufacturer of lithium-ion batteries as a primary product raises funds by securitizing the ownership of the coated active material, and a user who purchases and uses a lithium-ion battery as a primary product After the battery is used, the active material recycling system is entrusted with the recycling of the lithium-ion battery, and the manufacturer of the lithium-ion battery as a secondary product purchases the ownership of the securitized coated active material, or It is preferable to obtain the lease right for the coated active material and manufacture lithium ion batteries as secondary products.

Manufacturers of lithium ion batteries as primary products can raise funds by securitizing ownership of the coated active material. It is preferable to securitize the ownership of the coated active material because the purchaser of the security (an investor such as a bank or insurance company) will bear part of the cost of purchasing the active material. With a portion of the cost borne by the purchaser of securities, lithium-ion battery manufacturers can produce lithium-ion batteries as primary products using active materials at substantially lower prices than market prices. I can do it.

Manufacturers of lithium-ion batteries as primary products can lower the selling price of lithium-ion batteries because they can procure active materials at a price lower than the market price.
Users of lithium ion batteries as primary products can purchase and use lithium ion batteries at low prices. Here, since the purchaser of the securities has ownership of the covering active material, the user of the lithium ion battery does not have ownership of the covering active material. It becomes a state of borrowing material. Therefore, users of lithium-ion batteries as primary products must pay some form of expense to the purchaser of the securities.
Indicators for paying costs include methods such as monthly costs, which are based on the period of use, and benefits obtained from using lithium-ion batteries (e.g., amount of electricity used, distance traveled if used in a car, etc.) One method is to pay the cost according to the index).
By doing so, the purchaser of securities can enjoy benefits.

A user of a lithium-ion battery as a primary product shall be held liable if the battery capacity measured during use of the lithium-ion battery is less than the battery capacity specified in the specifications for the use of the lithium-ion battery as a primary product. , will outsource the recycling of lithium-ion batteries to Active Material Recycling System.
Users of lithium ion batteries as primary products essentially return the coated active material by outsourcing recycling.

Recycling is carried out by the manufacturer of lithium-ion batteries as a primary product, the user of lithium-ion batteries as a primary product, the manufacturer of lithium-ion batteries as a secondary product, or another third party. (a person who only performs recycling).
Specifically, the person carrying out the recycling disassembles the lithium ion battery as a primary product and takes out the coated active material. The person carrying out the recycling may remove the coating material from the removed coated active material and recoat the active material with the coating material.
In the following explanation, the coated active material including the active material taken out from the primary product will be described as the coated active material when the taken out coated active material is used as it is, and the coated active material where the active material is re-coated with the coating material. When used, the coated active materials are collectively referred to as "recycled coated active materials."
The person carrying out the recycling can obtain work costs related to recycling from the purchaser of the securities (the 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, the coated active material is taken out, and the recycled coated active material is returned to the market.
If the manufacturer of the lithium-ion battery as a primary product or another third party (person who only performs recycling) carries out the recycling, the user of the lithium-ion battery as a primary product is the owner of the coated active material. After the lithium ion battery has been used, the lithium ion battery is dismantled, the coated active material is taken out, and the recycled coated active material is returned to the market.

Manufacturers of lithium ion batteries as secondary products purchase the ownership rights to the securitized coated active materials or obtain the lease rights to the securitized coated active materials and produce lithium ion batteries as secondary products. Manufacture batteries.
If the final use is a lithium-ion battery as a secondary product, it is preferable to purchase ownership of the coated active material, but if you also plan to use the coated active material in a lithium-ion battery as a tertiary product. If so, it is preferable to obtain the lease rights of the securitized coated active material.
In addition, if a manufacturer of lithium-ion batteries as a secondary product carries out recycling, it may purchase ownership of the securitized coated active material or obtain a lease right for the securitized coated active material. Later, 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 manufacturing lithium ion batteries by purchasing new active materials from the market.
Due to its use, lithium-ion batteries as secondary products do not require the use of new active materials; even if recycled coated active materials are used, the battery capacity value can still meet the specifications. Recycled coated active materials that are inexpensive can be used.

Within this framework, purchasers of securities bear the benefits and risks of price fluctuations in active materials. If the market price of the active material increases from when the security was purchased, the security price will rise and you can make a profit by selling the security, but if the market price of the active material decreases from the time the security was purchased. will incur a loss because the security price will also fall.

In addition, the purchaser of a security can receive payment for the costs associated with the use of a lithium-ion battery using the coated active material covered by the security, as long as the lithium-ion battery is used.
Once a lithium ion battery is no longer used as a final product, the value of the coated active material associated with the security becomes essentially zero. Therefore, the price of the security will also be effectively zero.
Therefore, from the lithium ion battery as a primary product to the lithium ion battery as a final product, we have developed a method for covering active materials so that the amount paid from the start of use to the end of use of the covered active material is higher than the purchase price of the securities. By setting prices for the use of substances, purchasers of securities can be more assured of profits.

Businesses participating in this framework will receive the following benefits:
Manufacturers of lithium-ion batteries as primary products can procure active materials at lower prices than market prices and manufacture lithium-ion batteries.
Users of lithium ion batteries as primary products can procure lithium ion batteries at a price lower than the market price.
Manufacturers of lithium ion batteries as secondary products can procure coated active materials at lower prices than market prices and manufacture lithium ion batteries.
In addition, each business operator can reduce the risk associated with price fluctuations of active materials.
In addition, investors who purchase ownership of the securitized coated active material can receive payment for usage costs in the process of recycling and using the coated active material.
In other words, each of the businesses participating in this framework can enjoy the benefits of recycling the coated active material.

The active material recycling system of the present invention allows active materials made of expensive metals to be used effectively and multiple times as active materials for lithium-ion batteries, so it is very effective from the viewpoint of resource conservation and economics. Useful.

10 Battery capacity measuring section 20 Computer

Claims (2)

An active material in which active material particles for lithium ion batteries include a coated active material coated with a coating material, and the coated active material in a lithium ion battery is provided with an electrode active material layer consisting of a non-binding body of the coated active material. A recycling system,
The primary product for lithium-ion batteries is automotive use.
The use of the lithium-ion battery as a secondary product is as a stationary power source or emergency power source for home or business use,
For lithium ion batteries as primary products, a battery capacity measurement unit that measures the battery capacity and a computer that determines when to recycle are connected through a telecommunication line, and the battery capacity measured by the battery capacity measurement unit is The primary product is determined by using a recycling time determining means that determines the recycling time by comparing the battery capacity sent to the computer and received by the computer with the battery capacity specified in the specifications for the primary product. Steps to determine when to recycle lithium-ion batteries,
disassembling the lithium ion battery as the primary product and taking out the coated active material;
Recycling the coated active material by removing the coating material from the taken out coated active material and recoating the lithium ion battery active material particles with the coating material again;
An active material recycling system comprising the step of manufacturing a lithium ion battery as a secondary product using the re-coated active material . A manufacturer of a lithium ion battery as a primary product securitizes the ownership of the coated active material to raise funds,
Users who purchase and use lithium-ion batteries as primary products entrust the recycling of lithium-ion batteries to an active material recycling system after use.
Manufacturers of lithium ion batteries as secondary products purchase the ownership rights to the securitized coated active materials or obtain the lease rights to the securitized coated active materials and produce lithium ion batteries as secondary products. The active material recycling system according to claim 1 , which manufactures a battery.

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