JP2019532459A - 二次電池用正極活物質及びその製造方法 - Google Patents
二次電池用正極活物質及びその製造方法 Download PDFInfo
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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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
- C01B33/00—Silicon; Compounds thereof
- C01B33/02—Silicon
- C01B33/021—Preparation
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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
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
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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
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- 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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
Description
上記式中、πは周速であり、dは回転子の直径であり、VはRPMであり、及びηは粘度である。
以下、特定の実施形態に関してより詳細に本発明を説明するが、本発明はこれらの実施形態に限定されない。
平均直径約5μmの市販のポリシリコン粉末(2kg)を100%エタノールの酸化性溶媒(10kg)に分散させて分散混合物を調製した。表1に示す条件下の応力エネルギーに制御したビーズミル粉砕プロセスを実施し、実施例及び比較例のシリコン系一次粒子を作製して、当該作製した粒子の球形度及び粒度分布を後述の表2に示す。分析したシリコン系一次粒子の純度は99%以上であった。上記の調製方法は例示的なものであり、シリコン粒子は他の研磨プロセスによって、又はバルクシリコン材料(例えば、シリコンロッド及びウェハ)の電気化学的エクスプロージョンによって調製することができる。
表1及び2を参照すると、実施例1〜3に示すように、約9m/s〜18m/sの範囲の応力エネルギー下でシリコン粉末を湿式粉砕すると、球形度が0.5〜0.9の範囲内であり、かつ、D10が50以上であり、かつD90が150以下の値の範囲である粒度分布幅が1未満であることがわかる。一方、比較例1、2では、粒度分布が比較的広範囲にわたって広がり、粒度分布幅が1を超えることが分かる。応力エネルギーが大きすぎると処理時間は短くなるが、粒度分布幅が1を超えるように粒度を制御することができず、一方、比較例2では、応力エネルギーを小さくすると、かなりの粉砕時間の後でさえも、所望の粒度分布が得られないことがわかる。
12 カソード(正極)
13 アノード(負極)
14 セパレータ
15 電池容器
16 封入部材
Claims (11)
- 二次電池用正極活物質であって、
前記正極活物質は、シリコン系一次粒子を含み、前記シリコン系一次粒子の粒度分布が、D10≧50nmであり、かつD90≦150nmである、二次電池用正極活物質。 - 前記シリコン系一次粒子の球形度が0.5〜0.9の範囲である、請求項1に記載の二次電池用正極活物質。
- 前記シリコン系一次粒子が、シリコン粒子のコアと、前記コア上に形成された酸化シリコン層とを含む、請求項1に記載の二次電池用正極活物質。
- 前記シリコン系一次粒子の総重量に対する酸素含有量が、9重量%〜20重量%の範囲に限定される、請求項3に記載の二次電池用正極活物質。
- 前記シリコン系一次粒子の純度が99%以上である、請求項1に記載の二次電池用正極活物質。
- 前記シリコン系一次粒子の粒度分布幅が、1.0以下である、請求項1に記載の二次電池用正極活物質。
- 二次電池用正極活物質の調製方法であって、
シリコン粉末を準備する工程と、
前記シリコン粉末を酸化性溶媒中に分散させた分散混合物を準備する工程と、
下記の式で規定される機械的応力エネルギー(Es)を前記分散混合物の前記シリコン粉末に加えて、粒度分布がD10≧50nmであり、かつD90≦150nmである、精製シリコン粒子を形成する工程と、
(上記式中、πは周速であり、dは回転子の直径であり、VはRPMであり、及びηは粘度である。)
前記精製シリコン粒子を含む生成物を乾燥してシリコン系一次粒子を得る工程と、を有する、調製方法。 - 前記精製シリコン粒子を形成する工程は、前記機械的応力エネルギーを一遍に加えながら、前記酸化性溶媒を用いて前記精製シリコン粒子上に化学酸化物層を形成する工程である、請求項7に記載の方法。
- 前記酸化性溶媒は、水、脱イオン水、アルコール溶媒、又はそれらの2種以上の混合物を含む、請求項7に記載の方法。
- 前記アルコール溶媒は、エチルアルコール、メチルアルコール、グリセリン、プロピレングリコール、イソプロピルアルコール、イソブチルアルコール、ポリビニルアルコール、シクロヘキサノール、オクチルアルコール、デカノール、ヘキサデカノール、エチレングリコール、1,2-オクタンジオール、1,2-ドデカンジオール、及び1,2−ヘキサデカンジオール、又はそれらの混合物からなる群から選択される、任意の溶媒を含む、請求項9に記載の方法。
- 機械的応力エネルギーを加える工程が、酸化性溶媒と共に研磨粒子の組成物を用いるミル粉砕プロセスによって達成される、請求項7に記載の方法。
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EP3506399A2 (en) | 2019-07-03 |
EP3506399B1 (en) | 2021-10-13 |
KR101918815B1 (ko) | 2018-11-15 |
EP3506399A4 (en) | 2020-03-18 |
US20230155119A1 (en) | 2023-05-18 |
JP6957603B2 (ja) | 2021-11-02 |
WO2018038535A3 (ko) | 2018-04-19 |
WO2018038535A2 (ko) | 2018-03-01 |
US20190198869A1 (en) | 2019-06-27 |
CN109845002B (zh) | 2022-06-21 |
CN109845002A (zh) | 2019-06-04 |
KR20180023088A (ko) | 2018-03-07 |
US11588152B2 (en) | 2023-02-21 |
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