JP6628289B2 - メッシュ形態の集電体を含む負極、これを含むリチウム二次電池及びこの製造方法 - Google Patents
メッシュ形態の集電体を含む負極、これを含むリチウム二次電池及びこの製造方法 Download PDFInfo
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- JP6628289B2 JP6628289B2 JP2017143329A JP2017143329A JP6628289B2 JP 6628289 B2 JP6628289 B2 JP 6628289B2 JP 2017143329 A JP2017143329 A JP 2017143329A JP 2017143329 A JP2017143329 A JP 2017143329A JP 6628289 B2 JP6628289 B2 JP 6628289B2
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- negative electrode
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- lithium
- secondary battery
- electrode current
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/72—Grids
- H01M4/74—Meshes or woven material; Expanded metal
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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
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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Description
一般に、リチウム二次電池は、正極、負極、及び上記正極と上記負極の間に介在されたセパレータを含む電極組み立て体が積層または巻き取られた構造で電池ケースに内装し、その内部に非水電解液が注入されることで構成される。負極としてリチウム電極は、平面状の集電体上にリチウムホイルを付着して使用する。このような場合、充放電を行う時、リチウムの形成と除去が不規則で、リチウムデンドライトが形成されるし、これは持続的な容量低下につながる。
本発明による正極は、正極活物質、導電材及びバインダーを含む組成物を正極集電体に製膜して正極の形態で製造することができる。
<実施例1>
負極集電体で厚さが25μmの銅メッシュ(図4、図5に図示)上に厚さが40μmのリチウムホイルを載せて、リチウムホイルの50%が引き込まれるように圧力を加え、常温でロ−ルプレスして負極(図6、図7に図示)を製造した。
負極集電体で厚さが25μmの銅メッシュ(図4、図5に図示)上に厚さが40μmのリチウムホイルを載せて、リチウムホイルの40%が引き込まれるように調節したことを除いて、実施例1と同じ条件でリチウム二次電池を製造した。
負極集電体で厚さが25μmの銅メッシュ(図4、図5に図示)上に厚さが40μmのリチウムホイルを載せて、リチウムホイルの30%が引き込まれるように調節したことを除いて、実施例1と同じ条件でリチウム二次電池を製造した。
負極集電体で厚さが25μmの銅メッシュ(図4、図5に図示)上に厚さが40μmのリチウムホイルを載せて、リチウムホイルの20%が引き込まれるように調節したことを除いて、実施例1と同じ条件でリチウム二次電池を製造した。
負極集電体で厚さが25μmの銅メッシュ(図4、図5に図示)上に厚さが40μmのリチウムホイルを載せて、リチウムホイルの10%が引き込まれるように調節したことを除いて、実施例1と同じ条件でリチウム二次電池を製造した。
負極集電体で厚さが20μmの銅ホイルを適用し、負極の圧延工程を行わずに実施例1と同じ条件でリチウム二次電池を製造した。
上記実施例1ないし5と、比較例1のリチウム二次電池を0.1C充電/0.1C放電の条件で充放電テストを実施して、その結果を図8に示し、下記表1に整理した。
図9及び下記表2は、本発明の実施例1ないし5と比較例1による負極を適用したリチウム二次電池のレート(rate)性能を比べたデータである。
110 開口部
120 線材部
200 リチウム薄膜
210 引込部
220 非引込部
300 押圧ローラー
Claims (15)
- 線材部と開口部からなるメッシュ(mesh)形態の負極集電体;及び
上記負極集電体の開口部に引き込まれた引込部と、引き込まれていない非引込部からなるリチウム薄膜;を含み、
上記リチウム薄膜の引込部の厚さは、リチウム薄膜全体厚さの20ないし60%であり、
前記引込部の厚さは、前記負極集電体の厚さ未満である、リチウム二次電池用負極。 - 上記リチウム薄膜の非引込部の厚さは、全体リチウム薄膜厚さの40ないし80%であることを特徴とする請求項1に記載のリチウム二次電池用負極。
- 上記リチウム薄膜の厚さは10ないし800μmであることを特徴とする請求項1または請求項2に記載のリチウム二次電池用負極。
- 上記負極集電体の線材部は線の幅が50〜500μmで、線の間隔が100μm〜1mmであることを特徴とする請求項1ないし請求項3のいずれか一項に記載のリチウム二次電池用負極。
- 上記負極集電体の開口部の形状は、円形、楕円形または多角形であることを特徴とする請求項1ないし請求項4のいずれか一項に記載のリチウム二次電池用負極。
- 上記負極集電体の開口率は20ないし80%であることを特徴とする請求項1ないし請求項5のいずれか一項に記載のリチウム二次電池用負極。
- 上記負極集電体の厚さは3ないし500μmであることを特徴とする請求項1ないし請求項6のいずれか一項に記載のリチウム二次電池用負極。
- 上記負極集電体は、銅、アルミニウム、ステンレス鋼、亜鉛、チタン、銀、パラジウム、ニッケル、鉄、クロム、これらの合金及びこれらの組み合わせからなる群から選択される1種以上であることを特徴とする請求項1ないし請求項7のいずれか一項に記載のリチウム二次電池用負極。
- 線材部と開口部からなるメッシュ(mesh)形態の負極集電体;
上記負極集電体の開口部に引き込まれた引込部と、引き込まれていない非引込部からなるリチウム薄膜;及び
上記負極集電体が対面したリチウム薄膜の反対面に形成された保護構造物;
を含み、
上記リチウム薄膜の引込部の厚さは、リチウム薄膜全体厚さの20ないし60%であり、
前記引込部の厚さは、前記負極集電体の厚さ未満であり、
上記保護構造物は、有機重合体部と無機物質部で構成され、
上記線材部が接するリチウム薄膜の反対面に上記有機重合体部が、上記開口部にあたるリチウム薄膜の反対面に無機物質部が生成されたことを特徴とする、リチウム二次電池用負極。 - 上記有機重合体部は、ポリビニルアルコール、ポリイソブチレン、エポキシ、ポリエチレン、ポリプロピレン、ポリテトラフルオロエチレン及びこれらの組み合わせから選択されたことを特徴とする請求項9に記載のリチウム二次電池用負極。
- 上記無機物質部は、Li2O、Li3N、Al2O3、ZrO2、SiO2、CeO2、Al2TiO5、オキシ−スルフィド硝子及びこれらの組み合わせから選択されることを特徴とする請求項9または請求項10に記載のリチウム二次電池用負極。
- i)線材部と開口部からなるメッシュ形態の負極集電体を準備する段階;
ii)上記負極集電体上にリチウム薄膜を載せる段階;及び
iii)上記リチウム薄膜と負極集電体を圧延して上記リチウム薄膜が負極集電体の開口部に引き込まれる段階;を含み、
上記リチウム薄膜の引込部の厚さは、リチウム薄膜全体厚さの20ないし60%であり、
前記引込部の厚さは、前記負極集電体の厚さ未満である、リチウム二次電池用負極の製造方法。 - 上記iii)段階の圧延は、10kg/cm2〜100ton/cm2の圧力を印加することを特徴とする請求項12に記載のリチウム二次電池用負極の製造方法。
- 上記iii)段階の圧延は、100〜200℃の温度で加熱することを特徴とする請求項12または請求項13に記載のリチウム二次電池用負極の製造方法。
- 請求項1ないし請求項11のいずれか一項の負極を含むリチウム二次電池。
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2017
- 2017-07-24 CN CN201710606292.7A patent/CN107658472B/zh active Active
- 2017-07-24 US US15/657,801 patent/US10686193B2/en active Active
- 2017-07-25 PL PL17182964.1T patent/PL3276709T3/pl unknown
- 2017-07-25 ES ES17182964T patent/ES2944948T3/es active Active
- 2017-07-25 JP JP2017143329A patent/JP6628289B2/ja active Active
- 2017-07-25 HU HUE17182964A patent/HUE061993T2/hu unknown
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ES2944948T3 (es) | 2023-06-27 |
EP3276709A1 (en) | 2018-01-31 |
CN107658472A (zh) | 2018-02-02 |
HUE061993T2 (hu) | 2023-09-28 |
US10686193B2 (en) | 2020-06-16 |
US20180026271A1 (en) | 2018-01-25 |
EP3276709B1 (en) | 2023-04-12 |
CN107658472B (zh) | 2020-12-15 |
PL3276709T3 (pl) | 2023-06-19 |
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