WO2015190334A1 - リチウムイオン電池用活物質粒子の製造方法 - Google Patents
リチウムイオン電池用活物質粒子の製造方法 Download PDFInfo
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- WO2015190334A1 WO2015190334A1 PCT/JP2015/065744 JP2015065744W WO2015190334A1 WO 2015190334 A1 WO2015190334 A1 WO 2015190334A1 JP 2015065744 W JP2015065744 W JP 2015065744W WO 2015190334 A1 WO2015190334 A1 WO 2015190334A1
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- raw material
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- lithium ion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/40—Nickelates
- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
- C01G53/44—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/50—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese of the type [MnO2]n-, e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a production method for continuously producing active material particles for a lithium ion battery.
- the active material particles are converted into nano particles by using a breakdown type method in which active material particles having a particle size on the order of micrometers are crushed and a build-up type that directly produces active material nanoparticles from raw materials.
- the breakdown type is a method of crushing a certain amount of active material using media dispersion such as a ball mill or a bead mill.
- media dispersion such as a ball mill or a bead mill.
- a build-up type nanoparticle formation method has been studied recently.
- Many of the build-up types are methods of synthesis in a liquid phase, and specifically, a method in which active material nanoparticles are generated by dissolving or dispersing raw materials in a solvent and heating with stirring.
- Patent Document 1 The method disclosed in Patent Document 1 is a method called hydrothermal synthesis, and after the raw material is dissolved in water, it is sealed in a pressure-resistant container and heated to produce nanoparticulate lithium ion secondary battery active material is doing.
- Non-Patent Document 1 is a synthesis method called supercritical synthesis, which produces a nano-particle active material for a lithium ion battery by bringing a solution in which raw materials are dissolved into a supercritical state at high temperature and high pressure. is doing.
- the reaction system during synthesis is exposed to high pressure, the resulting particles tend to have high crystallinity and the particle size tends to be small.
- Patent Document 1 Even if the method of Patent Document 1 is used, it is possible to make the active material for a lithium ion battery into nanoparticles, but for mass production, a huge pressure-resistant and heat-resistant container is required, and production is a batch, It is difficult to produce particles continuously.
- Non-Patent Document 1 since the synthesis is performed in a supercritical state, it is difficult to increase the size and mass production of the apparatus.
- An object of the present invention is to provide a method for easily and efficiently producing a nanocrystalline lithium ion battery active material having high crystallinity.
- the present invention provides a plurality of raw material solutions capable of generating active material particles for lithium ion batteries or active material precursor particles for lithium ion batteries by inducing a chemical reaction by mixing, at least 0.3 MPa.
- Each of the plurality of raw material solutions is mixed at the confluence of the raw material supply flow path under a pressure of 500 MPa or less, and the active material particles for the lithium ion battery are continuously generated by the chemical reaction.
- a method of producing active material particles for lithium ion batteries comprising the step of generating active material precursor particles for lithium ion batteries.
- an active material for a lithium ion battery having a particle size on the order of nanometers and having high crystallinity can be produced simply and efficiently.
- the raw material solution is obtained by dissolving a raw material for generating the nanoparticles in a solvent, and by inducing a chemical reaction by mixing a plurality of active material particles for lithium ion batteries or lithium ion batteries It refers to a solution that can produce active material precursor particles.
- the lithium ion battery active material produced by the production method of the present invention may be either a positive electrode active material or a negative electrode active material.
- Examples of the positive electrode active material include LiMPO 4 , Li 2 MSiO 4 , and Li 2 MPO 4 F (M is one or more selected from Fe, Co, Mn, and Ni) in addition to LiMn 2 O 4 called spinel type. It is done.
- the plurality of raw material solutions capable of inducing a chemical reaction by mixing to generate active material particles for a lithium ion battery include a first raw material solution containing a lithium compound and a second raw material solution containing a transition metal. It is preferable. Of the elements constituting the positive electrode active material, raw material compounds other than lithium and transition metals may be added to either the first raw material solution or the second raw material solution. Moreover, you may add to a 3rd raw material solution or a 4th raw material solution, without adding to either. When producing an active material containing two or more kinds of transition metal elements, the third and fourth raw material solutions may be prepared using the respective transition metals as separate raw material solutions.
- the transition metal contained in the raw material solution it is preferable to use a salt in order to dissolve it in the solvent, and in consideration of solubility in water or an organic solvent, carbonate, phosphate, sulfate, hydrochloride, nitrate It is more preferable to use acetate or acetylacetone salt, and it is particularly preferable to use sulfate, nitrate, or acetate in consideration of solubility in water, which is a general-purpose solvent.
- a salt as the lithium compound in consideration of solubility in water or an organic solvent, among which lithium carbonate and lithium hydroxide are preferable, and water in consideration of solubility in water, which is a general-purpose solvent. It is preferable to use lithium oxide.
- LiMn 2 O 4 it is preferable to use a combination of a first raw material solution in which a Li salt is dissolved and a second raw material solution in which a Mn salt is dissolved.
- a combination of three solutions of the second raw material solution in which the M salt is dissolved and the third raw material solution in which the phosphate compound is dissolved a combination of three solutions of the second raw material solution in which the M salt is dissolved and the third raw material solution in which the phosphate compound is dissolved.
- Li 2 MSiO 4 a combination of three solutions of a first raw material solution in which an Li salt is dissolved, a second raw material solution in which an M salt is dissolved, and a third raw material solution in which an Si compound is dissolved.
- the liquid may be mixed to the extent that precipitation does not occur to form three liquids or two liquids.
- the lithium ion battery active material precursor particles are compound particles containing at least a part of the elements contained in the finally obtained lithium ion battery active material, and are obtained by some additional treatment.
- such precursor particles are preferably particles of a compound containing all elements except lithium and oxygen among the elements contained in the finally obtained active material, more specifically.
- transition metal salt particles are preferably transition metal salt particles.
- transition metal salt particles hydroxide particles, carbonate particles, acetylacetone salt particles containing one transition metal element selected from the group consisting of nickel, manganese, cobalt and aluminum are selected from the group.
- a lithium source such as a lithium compound such as lithium hydroxide or lithium carbonate
- a raw material solution capable of generating active material precursor particles for a lithium ion battery a first raw material solution containing a transition metal and a second raw material solution containing an element other than the transition metal contained in the precursor particles It is preferable to use a combination.
- a first raw material solution containing a transition metal and a second raw material solution containing a counter ion that forms a salt with the transition metal contained in the first raw material solution is preferable to use a plurality of raw material solutions containing
- the transition metal contained in the first raw material solution is preferably a salt in order to dissolve in the solvent, and in consideration of solubility in water or an organic solvent, carbonate, phosphate, sulfuric acid It is more preferable to use a salt, hydrochloride, nitrate, acetate, or acetylacetone salt, and it is particularly preferable to use a sulfate, nitrate, or acetate in consideration of solubility in water, which is a general-purpose solvent.
- a combination of one or more raw material solutions in which a transition metal is dissolved and a raw material solution in which a compound containing hydroxide ions is dissolved can be used.
- the dissolved transition metal A combination of one or more raw material solutions and a raw material solution in which a compound containing carbonate is dissolved can be used.
- the solvent of the raw material solution is appropriately selected in consideration of the solubility of the raw material.
- One type of solvent may be used, but two or more types of mixed solvents may be used.
- a coordinating solvent having coordinating properties to the particles is selected, an effect of reducing the particle size of the synthesized particles can be expected. Therefore, it is preferable to use the coordinating solvent at least in part.
- alcohol solvents are preferable. Specific examples include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 2-propanol, 1,3-propanediol, 1,4- Examples include butanediol.
- Amine solvents can also be used as preferred coordinating solvents, such as hexylamine, heptylamine, octylamine, nonylamine, decanamine, dioctylamine, trioctylamine, piperazine and other linear, branched or cyclic saturated aliphatics.
- linear, branched, or cyclic unsaturated aliphatic primary, secondary, or tertiary amines such as oleylamine, linoleamine, and linolenicamine are exemplified.
- coordinating solvents that can be suitably used include linear, branched, or cyclic saturation such as butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, etc.
- the solvents used in the plurality of raw material solutions may be different or the same, but when different solvents are used, a combination of compatible solvents is preferable. It can be expected that by mixing, the raw materials are uniformly mixed at the time of mixing, and nanoparticles having a small amount of impurities and a uniform composition can be produced.
- the chemical reaction in the production method of the present invention preferably includes a reaction mechanism in which particles are generated immediately after mixing the raw material solution.
- the production of active material particles or active material precursor particles is included.
- the reaction preferably includes a neutralization reaction. Therefore, it is preferable that the pH of at least one raw material solution is 5 or less and the pH of at least one other raw material solution is 9 or more.
- a plurality of raw material solutions can be joined at a constant ratio, so that the pH after joining tends to be constant, and it is necessary to keep the pH as the reaction proceeds.
- It can be particularly suitably applied to particle synthesis.
- Na 2 CO 3 is added to an aqueous solution of Ni, Mn, Co sulfate.
- ammonia water was appropriately added, but it took a certain time for the pH to stabilize.
- aqueous ammonia is added to Na 2 CO 3 in advance, and the pH of the mixed solution after the reaction can be immediately stabilized by reacting with the aqueous sulfate solution at the flow path merging point.
- the plurality of raw material solutions described above are each flowed to the raw material supply flow path under pressure, and continuously by a chemical reaction at the junction of the raw material supply flow path, the active material particles for lithium ion batteries Or the active material precursor particle
- the raw material solutions are respectively sent to the flow path by a plunger pump and merged.
- the number of plunger pumps and flow paths need only be the number of minimum raw material solutions, but in that case, due to the nature of the plunger pump, the raw material is intermittently supplied to the confluence, and at the confluence Time for the raw material to stay is generated. Therefore, in order to perform more stable production, it is more preferable to configure each raw material solution to flow through two raw material supply channels and to perform a pulsating operation in which the raw material solution is supplied without interruption.
- the flow path diameter immediately before the confluence of the raw material supply flow paths is preferably 3 mm or less, in order to limit the contact area between the raw materials at the confluence and uniform the reaction of the raw materials, and 0.5 mm or less. More preferably. Moreover, in order to suppress the pressure loss of the raw material which flows through a flow path, it is preferable to set it as 0.05 mm or more, and it is more preferable to set it as 0.1 mm or more.
- the pressure at the time of merging is 0.3 MPa or more and 500 MPa or less. Since the treatment time can be shortened as the pressure increases, the pressure at the time of merging is preferably 1 MPa or more, and more preferably 10 MPa or more. Further, if the pressure is too high, the temperature rise of the solution after the merging becomes large, and there is a possibility of the bumping of the solvent or the progress of side reactions, so the pressure is preferably 250 MPa or less.
- the merges may be combined into one place and reacted at a time, or the reaction may be multistaged by merging at two or more places.
- a wet jet mill for the manufacturing apparatus for carrying out the manufacturing method of the present invention.
- wet jet mills include the JN series (manufactured by Joko), the starburst (registered trademark) series (manufactured by Sugino Machine), and the nanoveita (registered trademark) series (manufactured by Yoshida Kikai Kogyo Co., Ltd.).
- a nanoveita combined with a nanoreactor microreactor can be used particularly suitably.
- the raw material solution is mixed at the confluence of the raw material supply flow path so as to be equal to or higher than the reaction temperature necessary for the chemical reaction for generating the active material particles for lithium ion batteries or the active material precursor particles for lithium ion batteries. It is preferable to adjust the temperature before (joining). By adjusting the temperature of the raw material solution before mixing, the particle formation reaction immediately proceeds at the time of merging, and particles having a high crystallinity and a small particle diameter can be obtained. Moreover, since the reaction temperature has not been reached, it is possible to prevent the formation of a product other than the target product.
- the temperature after the raw material solutions are merged is preferably 60 ° C. or higher and 120 ° C. or lower, and more preferably 80 ° C. or higher and 110 ° C. or lower.
- Such temperature adjustment may be performed in advance before flowing the raw material solution into the raw material supply flow path, but it is more preferable to perform it before the confluence of the raw material supply flow path in order to prevent the raw material from being denatured.
- active material particles for lithium ion batteries having high crystallinity are produced.
- the height of the crystallinity of the active material particles is evaluated by the size of the crystallite size relative to the particle size. The closer the crystallite size (nm) / average particle size (nm) is to 1, the higher the crystallinity.
- Example 1 Production of Li (Ni 1/3 Mn 1/3 Co 1/3 ) O 2
- Manganese sulfate monohydrate 1.69 g, Cobalt sulfate heptahydrate 2.81 g, Nickel sulfate hexahydrate 2.63 g was dissolved in 100 g of pure water to obtain a first raw material solution. Further, 3.18 g of sodium carbonate was dissolved in 100 g of pure water to obtain a second raw material solution. When the two raw material solutions were mixed, 0.8 g of 28% ammonia water was added to the second raw material solution so that the pH of the mixed solution was 8.
- Nanovater L-ED manufactured by Yoshida Kikai Kogyo Co., Ltd.
- a microreactor having a turbulent flow mechanism with a channel diameter of about 200 ⁇ m and a channel that bends at a right angle at the junction point
- the raw material solution is allowed to flow through the microreactor flow path, and is mixed at a ratio of 1: 1 at the confluence of the microreactor flow path under a pressure of 20 MPa, respectively, so that the solid content is (Mn 1/3 Ni 1/3 Co 1 / 3 ) CO 3 particles were obtained.
- the average particle size was calculated to be 132.2 nm.
- the obtained nanoparticles were mixed with 1.28 g of lithium hydroxide monohydrate and fired at 800 ° C.
- Example 2 Production of lithium iron phosphate 2.52 g of lithium hydroxide monohydrate was dissolved in 15 g of pure water, and 26.0 g of diethylene glycol was added to obtain a first raw material solution. Iron (II) sulfate heptahydrate 5.56 g and ascorbic acid 1 g are dissolved in 12 g of pure water, 2.3 g of phosphoric acid aqueous solution (85%) is added, and then 17.3 g of diethylene glycol is added to the second raw material. It was set as the solution.
- Iron (II) sulfate heptahydrate 5.56 g and ascorbic acid 1 g are dissolved in 12 g of pure water, 2.3 g of phosphoric acid aqueous solution (85%) is added, and then 17.3 g of diethylene glycol is added to the second raw material. It was set as the solution.
- the two raw material solutions are heated to 80 ° C., and the first raw material solution: the second raw material solution is flowed through the nanometer L-ED flow path under a pressure of 10 MPa at a ratio of 1.3: 1.
- the obtained particles were LiFePO 4 by identifying the crystal phase according to A above.
- the average particle size was calculated to be 61.1 nm, the crystallite size was 52.2 nm, and the crystallite size (nm) / average particle size (nm) was 0.85.
- the obtained lithium iron phosphate was mixed with glucose at a weight ratio of 4: 1 and baked at 700 ° C.
- the obtained carbon-coated lithium iron phosphate was evaluated according to C above with a theoretical capacity of 170 mAh / g, and the charge / discharge characteristics were evaluated. As a discharge capacity, 140 mAh / g at 0.1 C and 115 mAh / g at 3 C were obtained. .
- Example 3 Production of lithium manganese phosphate For lithium ion batteries, in the same manner as in Example 2, except that 5.56 g of iron (II) sulfate heptahydrate was changed to 3.38 g of manganese sulfate monohydrate. Active material particles were obtained. When the crystal phase of the obtained particles was identified, it was confirmed to be LiMnPO 4 . Further, when the average particle diameter was calculated according to B above, the crystallite size was 43.3 nm, the crystallite size was 39.8 nm, and the crystallite size (nm) / average particle diameter (nm) was 0.92. The obtained lithium manganese phosphate was mixed with glucose at a weight ratio of 4: 1 and baked at 700 ° C.
- Comparative Example 1 Production of Li (Ni 1/3 Mn 1/3 Co 1/3 ) O 2 While stirring the first raw material solution of Example 1 with a magnetic stirrer, pH was added by adding ammonia. While maintaining the above, the second raw material solution was dropped to obtain (Mn 1/3 Ni 1/3 Co 1/3 ) CO 3 particles as a solid content. The average particle size was calculated to be 384.5 nm, and the particle size became coarse. The obtained nanoparticles were mixed with 1.28 g of lithium hydroxide monohydrate and baked at 800 ° C. in an air atmosphere to obtain an average particle size of 789.5 nm and a crystallite size as active material particles for a lithium ion battery.
- the obtained Li (Ni 1/3 Mn 1/3 Co 1/3 ) O 2 was evaluated according to the above C and the theoretical capacity was 160 mAh / g, the charge / discharge characteristics were evaluated, and the discharge capacity was 133 mAh / 0.1 C at 0.1 C. It was 124 mAh / g in g and 3C.
- Example 2 The first raw material solution of Example 2 was heated to 80 ° C. while stirring at 300 rpm with a hot plate stirrer, and the second raw material solution similarly heated to 80 ° C. was dropped to obtain a solid content. When the crystal phase of the obtained solid was identified, it was found that Li 3 PO 4 was present in addition to LiFePO 4 . Although attempts calculating the average particle size, since the LiFePO 4 and impurities are mixed, could not be measured.
- Example 3 the first raw material solution was heated to 80 ° C. while stirring at 300 rpm with a hot plate stirrer, and the second raw material solution heated to 80 ° C. was dropped to obtain a solid.
- an impurity phase such as Mn 5 (HPO 4 ) 2 (PO 4 ) 2 .4H 2 O or Li 3 PO 4 was present in addition to LiMnPO 4 .
- attempts calculating an average particle size in accordance with the A since the LiMnPO 4 and impurities are mixed, could not be measured.
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Abstract
Description
走査型電子顕微鏡(日立ハイテク社製 S-5500)を用いて30個以上60個以下の粒子が一視野に入る倍率で粒子を観察し、視野内のすべての粒子の粒子径の平均を平均粒子径とした。各粒子の粒子径は、粒子の最大径と最小径の平均とした。
X線回折装置であるブルカーエイエックスエス株式会社製D8 ADVANCEを用い2θ=5°から70°までステップ角0.040°、ステップタイム70.4秒の条件下で測定することで行った。また、結晶子サイズの算出はD8 ADVANCE付属のリートベルト解析ソフトTOPASを用いて行った。
活物質粒子900重量部、導電助剤としてアセチレンブラック(電気化学工業株式会社製 デンカブラック(登録商標))50重量部、バインダーとしてポリフッ化ビニリデン(アルケマ株式会社 Kynar HSV900)50重量部、溶剤としてN-メチルピロリドン1200重量をプラネタリーミキサーで混合して、電極ペーストを得た。当該電極ペーストをアルミニウム箔(厚さ18μm)にドクターブレード(300μm)を用いて塗布し、80℃30分間乾燥して電極板を得た。作製した電極板を直径15.9mmに切り出して正極とし、直径16.1mm厚さ0.2mmに切り出したリチウム箔を負極とし、直径20mmに切り出したセルガード(登録商標)#2400(セルガード社製)をセパレータとし、LiPF6を1M含有するエチレンカーボネート:ジエチルカーボネート=3:7(体積比)の溶媒を電解液として、2032型コイン電池を作製し、電気化学評価を行った。測定は、充放電測定をレート0.1Cで3回行った後続けて3Cで3回行い、各レートの3回目の放電時の容量を放電容量とした。
[実施例1]Li(Ni1/3Mn1/3Co1/3)O2の製造
硫酸マンガン一水和物1.69g、硫酸コバルト七水和物2.81g、硫酸ニッケル六水和物2.63gを純水100gに溶解させて第1の原料溶液とした。また、炭酸ナトリウム3.18gを純水100gに溶解させて第2の原料溶液とした。2つの原料溶液を混合した際に、混合液のpHが8となるよう、第2の原料溶液に0.8gの28%アンモニア水を添加した。流路径が約200μmであり、合流地点にて流路が直角に曲がる乱流機構を有するマイクロリアクタを装着したナノヴェイタL-ED(吉田機械興業株式会社製)にて第1の原料溶液および第2の原料溶液を該マイクロリアクタ内流路に流し、それぞれ20MPaの加圧下で、該マイクロリアクタ内流路の合流点で1:1の割合で混合し、固形分として(Mn1/3Ni1/3Co1/3)CO3粒子を得た。平均粒径を算出すると132.2nmであった。得られたナノ粒子を水酸化リチウム一水和物1.28gと混合し、大気雰囲気下800℃にて焼成することで、平均粒径252.3nm、結晶子サイズ201.2nm、平均粒径に対する結晶子サイズが0.80であるLi(Ni1/3Mn1/3Co1/3)O2を得た。得られたLi(Ni1/3Mn1/3Co1/3)O2を上記Cに従い、理論容量を160mAh/gとして充放電特性を評価したところ、放電容量として0.1Cにて145mAh/g,3Cにて135mAh/gを得た。
水酸化リチウム一水和物2.52gを純水15gへ溶解し、ジエチレングリコール26.0gを加えて第1の原料溶液とした。硫酸鉄(II)七水和物5.56gとアスコルビン酸1gを純水12gに溶解させ、リン酸水溶液(85%)2.3gを加えた後、ジエチレングリコール17.3gを加えて第2の原料溶液とした。
硫酸鉄(II)七水和物5.56gを硫酸マンガン一水和物3.38gに変えた以外は実施例2と同様にして、リチウムイオン電池用活物質粒子を得た。得られた粒子の結晶相の同定を行うと、LiMnPO4であることが確認できた。また、上記Bに従い、平均粒径を算出すると43.3nm、結晶子サイズは39.8nm、結晶子サイズ(nm)/平均粒径(nm)は0.92であった。得られたリン酸マンガンリチウムをグルコースと4:1の重量比で混合し、アルゴン雰囲気下にて700℃で6時間焼成することで、リン酸マンガンリチウムにカーボンコートを施した。得られたカーボンコートリン酸鉄リチウムを上記Cに従い、理論容量を171mAh/gとして充放電特性を評価したところ、放電容量として0.1Cにて136mAh/g,3Cにて102mAh/gを得た。
実施例1の第1の原料溶液をマグネティックスターラーで撹拌しつつ、アンモニアを添加することでpH=8を維持しつつ、第2の原料溶液を滴下し、固形分としての(Mn1/3Ni1/3Co1/3)CO3粒子を得た。平均粒径を算出すると384.5nmであり、粒径は粗大化した。得られたナノ粒子を水酸化リチウム一水和物1.28gと混合し、大気雰囲気下800℃にて焼成することで、リチウムイオン電池用活物質粒子として平均粒径789.5nm、結晶子サイズ531.9nm、結晶子サイズ(nm)/平均粒径(nm)が0.67と粒径が粗大化し、結晶性が低下したLi(Ni1/3Mn1/3Co1/3)O2を得た。得られたLi(Ni1/3Mn1/3Co1/3)O2を上記Cに従い、理論容量を160mAh/gとして充放電特性を評価したところ、放電容量は0.1Cにて133mAh/g,3Cにて124mAh/gであった。
実施例2の第1の原料溶液をホットプレートスターラーにて300rpmで撹拌しつつ80℃まで加熱し、同じく80℃まで加熱した第2の原料溶液を滴下し固形分を得た。得られた固形物の結晶相の同定を行うと、LiFePO4以外にLi3PO4が存在することがわかった。また、平均粒径を算出しようとしたが、LiFePO4と不純物が混在するため、測定できなかった。
実施例3において第1の原料溶液をホットプレートスターラーにて300rpmで撹拌しつつ80℃まで加熱し、80℃まで加熱した第2の原料溶液を滴下し固形物を得た。得られた固形物を結晶相の同定を行うとLiMnPO4以外にMn5(HPO4)2(PO4)2・4H2OやLi3PO4などの不純物相が存在することがわかった。また、上記Aに従い平均粒径を算出しようとしたが、LiMnPO4と不純物が混在するため、測定できなかった。
Claims (8)
- 混合により化学反応を誘発してリチウムイオン電池用活物質粒子またはリチウムイオン電池用活物質前駆体粒子を生成し得る複数の原料溶液を、0.3MPa以上500MPa以下の加圧下でそれぞれ原料供給用流路に流し、該原料供給用流路の合流点で前記複数の原料溶液を混合せしめ、前記化学反応により連続的にリチウムイオン電池用活物質粒子を生成するか、またはリチウムイオン電池用活物質前駆体粒子を生成する工程を有することを特徴とするリチウムイオン電池用活物質粒子の製造方法。
- 前記原料供給用流路の前記合流点直前における流路径が0.05mm以上3mm以下である、請求項1に記載のリチウムイオン電池用活物質粒子の製造方法。
- 前記原料供給用流路の合流点付近で合流後の前記原料溶液に乱流を与える、請求項1または請求項2に記載のリチウムイオン電池用活物質粒子の製造方法。
- 前記複数の原料溶液を、前記原料供給用流路の合流点における混合直後に前記化学反応に誘発に必要な反応温度以上となるよう混合前に温度調整する、請求項1~請求項3のいずれかに記載のリチウムイオン電池用活物質粒子の製造方法。
- 前記化学反応が中和反応を含む、請求項1~請求項4のいずれかに記載のリチウムイオン電池用活物質粒子の製造方法。
- 前記原料溶液の溶媒が配位性溶媒である、請求項1~請求項5のいずれかに記載のリチウムイオン電池用活物質粒子の製造方法。
- 請求項1~請求項6のいずれかに記載のリチウムイオン電池用活物質粒子の製造方法において、前記複数の原料溶液が、リチウム化合物を含む第1の原料溶液と、遷移金属を含む第2の原料溶液とを含み、前記化学反応により連続的にリチウムイオン電池活物質粒子を生成することを特徴とするリチウムイオン電池用正極活物質粒子の製造方法。
- 請求項1~請求項6のいずれかに記載のリチウムイオン電池用活物質粒子の製造方法において、前記リチウムイオン電池用活物質前駆体粒子は遷移金属塩粒子であり、前記複数の原料溶液が、前記遷移金属塩粒子を構成する遷移金属を含む第1の原料溶液と、前記遷移金属と塩を形成する対イオンを含む第2の原料溶液とを含み、前記化学反応により連続的にリチウムイオン電池活物質前駆体粒子を生成する工程を有することを特徴とするリチウムイオン電池用正極活物質粒子の製造方法。
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