JP2016042459A - 薄型蓄電デバイス及びその製造方法 - Google Patents
薄型蓄電デバイス及びその製造方法 Download PDFInfo
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- JP2016042459A JP2016042459A JP2015137011A JP2015137011A JP2016042459A JP 2016042459 A JP2016042459 A JP 2016042459A JP 2015137011 A JP2015137011 A JP 2015137011A JP 2015137011 A JP2015137011 A JP 2015137011A JP 2016042459 A JP2016042459 A JP 2016042459A
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- Prior art keywords
- layer
- metal foil
- active material
- electrode active
- positive electrode
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Abstract
【解決手段】第一金属箔層2と、該第一金属箔層の一方の面における一部の領域に積層された正極活物質層3と、を含む正極部22と、第二金属箔層12と、該第二金属箔層の一方の面における一部の領域に積層された負極活物質層13と、を含む負極部23と、正極部と負極部の間に配置されたセパレーター21と、を備え、第一金属箔層2とセパレーター21との間に正極活物質層3が配置され、第二金属箔層12とセパレーター21との間に負極活物質層13が配置され、正極部22の第一金属箔層の前記一方の面における正極活物質層3が形成されていない周縁部領域と、負極部23の第二金属箔層の前記一方の面における負極活物質層13が形成されていない周縁部領域とが、熱可塑性樹脂を含有してなる周縁封止層31を介して接合された構成とする。
【選択図】図2
Description
第二金属箔層と、該第二金属箔層の一方の面における一部の領域に積層された負極活物質層と、を含む負極部と、
前記正極部と前記負極部の間に配置されたセパレーターと、を備え、
前記第一金属箔層と前記セパレーターとの間に前記正極活物質層が配置され、前記第二金属箔層と前記セパレーターとの間に前記負極活物質層が配置され、
前記正極部の第一金属箔層の前記一方の面における正極活物質層が形成されていない周縁部領域と、前記負極部の第二金属箔層の前記一方の面における負極活物質層が形成されていない周縁部領域とが、熱可塑性樹脂を含有してなる周縁封止層を介して接合されていることを特徴とする薄型蓄電デバイス。
前記第二金属箔層の他方の面に、該第二金属箔層が露出した第二金属露出部を残した態様で、第二絶縁樹脂フィルムが積層されている前項1に記載の薄型蓄電デバイス。
前記第二金属箔層が、アルミニウム箔、銅箔、ステンレス箔、ニッケル箔またはチタン箔で形成されている前項1〜6のいずれか1項に記載の薄型蓄電デバイス。
第二金属箔層と、該第二金属箔層の一方の面における一部の領域に積層された負極活物質層と、前記第二金属箔層の前記一方の面における負極活物質層が形成されていない周縁部に設けられた第二熱可塑性樹脂層と、を備えた負極側シート体を準備する工程と、
セパレーターを準備する工程と、
前記正極側シート体と前記負極側シート体とを互いの熱可塑性樹脂層で接触させると共に前記正極活物質層と前記負極活物質層との間に前記セパレーターを挟み込んだ状態で、前記正極側シート体の第一熱可塑性樹脂層と前記負極側シート体の第二熱可塑性樹脂層とをヒートシール接合する工程と、を含むことを特徴とする薄型蓄電デバイスの製造方法。
・ポリエチレン製セパレーター
・ポリプロピレン製セパレーター
・ポリエチレンフィルムとポリプロピレンフィルムとからなる複層フィルムで形成されるセパレーター
・上記のいずれかにセラミック等の耐熱無機物を塗布した湿式又は乾式の多孔質フィルムで構成されるセパレーター
等が挙げられる。前記セパレーター21の厚さは、5μm〜50μmに設定されるのが好ましい。
1)リン酸と、
クロム酸と、
フッ化物の金属塩及びフッ化物の非金属塩からなる群より選ばれる少なくとも1種の化合物と、を含む混合物の水溶液
2)リン酸と、
アクリル系樹脂、キトサン誘導体樹脂及びフェノール系樹脂からなる群より選ばれる少なくとも1種の樹脂と、
クロム酸及びクロム(III)塩からなる群より選ばれる少なくとも1種の化合物と、を含む混合物の水溶液
3)リン酸と、
アクリル系樹脂、キトサン誘導体樹脂及びフェノール系樹脂からなる群より選ばれる少なくとも1種の樹脂と、
クロム酸及びクロム(III)塩からなる群より選ばれる少なくとも1種の化合物と、
フッ化物の金属塩及びフッ化物の非金属塩からなる群より選ばれる少なくとも1種の化合物と、を含む混合物の水溶液
上記1)〜3)のうちのいずれかの水溶液を金属箔の表面に塗工した後、乾燥することにより、化成処理を施す。
(正極側シート体61の作成)
縦20cm、横30cm、厚さ15μmの硬質アルミニウム箔(JIS H4160で分類されるA1100の硬質アルミニウム箔)2の一方の面(の全面)に、バインダーとしてのPVDFを溶媒のジメチルホルムアミド(DMF)に溶解させたバインダー液を塗布した後、100℃で30秒間乾燥せしめることによって、乾燥後の厚さが0.5μmのバインダー層7を形成した。
縦20cm、横30cm、厚さ15μmの硬質銅箔(JIS H3100で分類されるC1100Rの硬質銅箔)2の一方の面(の全面)に、バインダーとしてのPVDFを溶媒のジメチルホルムアミド(DMF)に溶解させたバインダー液を塗布した後、100℃で30秒間乾燥せしめることによって、乾燥後の厚さが0.5μmのバインダー層17を形成した。
次に、上記正極側シート体61と負極側シート体62との間に、縦85mm×横54mm×厚さ8μmの多孔質の湿式セパレーター21を配置した(参考図;図7)。この時、正極側シート体61は、セパレーター21側に正極活物質層3が存在するように配置すると共に、負極側シート体62は、セパレーター21側に負極活物質層13が存在するように配置した(参考図;図7)。
負極部の第二金属箔層として、硬質の銅箔に代えて、硬質のステンレス箔(SUS304)を使用した以外は、実施例1と同様にして、図1、2に示す構成の電池容量20mAhのカード型の薄型蓄電デバイス(薄型模擬電池)1を得た。
実施例1で得た正極側シート体61に更に次のような付加構成を設けたこと以外は、実施例1と同様にして、図3、4に示す構成の電池容量20mAhのカード型の薄型蓄電デバイス(薄型模擬電池)1を得た。
まず、下記のようにしてラミネート外装材151、152、正極タブリード131、負極タブリード141をそれぞれ準備した。
厚さ20μmの軟質アルミニウム箔(JIS H4160で分類されるA8021の軟質アルミニウム箔)の一方の面に、ポリエステルウレタン系接着剤を介して厚さ12μmのポリエステルフィルムを貼り合わせ、前記軟質アルミニウム箔の他方の面に、ポリオレフィン系接着剤を介して厚さ25μmのポリプロピレンフィルムを貼り合わせ、次いで40℃の恒温槽内で3日間養生した後、裁断することによって、85mm×54mmのサイズのラミネート外装材151、152を得た。
長さ40mm、幅3mm、厚さ500μmの硬質のアルミニウム板(JIS H4000で分類されるA1050の硬質アルミニウム箔)の長さ方向の一端から5mm中の位置から内側の部分領域の両面に、長さ10mm、幅5mm、厚さ50μmの無水マレイン酸変性ポリプロピレンフィルム(融点140℃、MFRは3.0g/10分)からなる絶縁フィルム132をヒートシールにより挟着して、図10に示す正極タブリード131を得た。
長さ40mm、幅3mm、厚さ500μmのニッケル板の長さ方向の一端から5mm中の位置から内側の部分領域の両面に、長さ10mm、幅5mm、厚さ50μmの無水マレイン酸変性ポリプロピレンフィルム(融点140℃、MFRは3.0g/10分)からなる絶縁フィルム142をヒートシールにより挟着して、図10に示す負極タブリード141を得た。
縦20cm、横30cm、厚さ15μmの硬質アルミニウム箔(JIS H4160で分類されるA1100の硬質アルミニウム箔)の一方の面(の全面)に、バインダーとしてのPVDFを溶媒のジメチルホルムアミド(DMF)に溶解させたバインダー液を塗布した後、100℃で30秒間乾燥せしめることによって、乾燥後の厚さが0.5μmのバインダー層を形成した。
各薄型蓄電デバイスの全体質量(g)を測定して軽量性を調べると共に、薄型蓄電デバイスにおける最も厚い部分の厚さ(μm)を測定して薄型性を調べた。
各薄型蓄電デバイスについてそれぞれサンプルを4個準備した。各薄型蓄電デバイスの第1サンプルに対して10mAの充電電流で4.2Vになるまで充電した後、10mA電流値で3.0Vまで放電したときの放電容量比率(充電直後の放電容量比率)を測定すると共に、内部抵抗測定器を用いて薄型蓄電デバイスの内部抵抗値の測定を行った。
放電容量比率(%)=(各実施例の充電直後の放電容量測定値)÷(比較例1の充電直後の放電容量測定値)×100
上記計算式で計算される値である。
また、各薄型蓄電デバイスの第2サンプルに対して10mAの充電電流で4.2Vになるまで充電した後、40℃の恒温槽内に7日間放置し、次いでこれを取り出して、10mA電流値で3.0Vまで放電したときの放電容量比率(40℃放置後の放電容量比率)を測定した。
40℃放置後の放電容量比率(%)=(各実施例の40℃放置後の放電容量測定値)÷(比較例1の充電直後の放電容量測定値)×100
上記計算式で計算される値であり、一方、
比較例1における「40℃放置後の放電容量比率」は、
40℃放置後の放電容量比率(%)=(比較例1の40℃放置後の放電容量測定値)÷(比較例1の充電直後の放電容量測定値)×100
上記計算式で計算される値である。
各薄型蓄電デバイスの第3サンプルに対して10mAの充電電流で4.2Vになるまで充電した後、60℃の恒温槽内に7日間放置し、次いでこれを取り出して、10mA電流値で3.0Vまで放電したときの放電容量比率(60℃放置後の放電容量比率)を測定した。なお、「60℃放置後の放電容量比率」の計算式は、上記「40℃放置後の放電容量比率」の計算式に準じる。
更に、各薄型蓄電デバイスの第3サンプルに対して10mAの充電電流で4.2Vになるまで充電した後、80℃の恒温槽内に7日間放置し、次いでこれを取り出して、10mA電流値で3.0Vまで放電したときの放電容量比率(80℃放置後の放電容量比率)を測定した。なお、「80℃放置後の放電容量比率」の計算式は、上記「40℃放置後の放電容量比率」の計算式に準じる。
・薄型リチウム2次電池(リチウムイオン電池、リチウムポリマー電池等)等の薄型電気化学デバイス
・薄型リチウムイオンキャパシタ
・薄型電気2重層コンデンサ
等が挙げられる。
2…第一金属箔層
3…正極活物質層
4…第一熱可塑性樹脂層
5…電解液
8…第一絶縁樹脂フィルム層
9…第一金属露出部
12…第二金属箔層
13…負極活物質層
14…第二熱可塑性樹脂層
15…電解液
18…第二絶縁樹脂フィルム層
19…第二金属露出部
21…セパレーター
22…正極部
23…負極部
31…周縁封止層
61…正極側シート体
62…負極側シート体
Claims (10)
- 第一金属箔層と、該第一金属箔層の一方の面における一部の領域に積層された正極活物質層と、を含む正極部と、
第二金属箔層と、該第二金属箔層の一方の面における一部の領域に積層された負極活物質層と、を含む負極部と、
前記正極部と前記負極部の間に配置されたセパレーターと、を備え、
前記第一金属箔層と前記セパレーターとの間に前記正極活物質層が配置され、前記第二金属箔層と前記セパレーターとの間に前記負極活物質層が配置され、
前記正極部の第一金属箔層の前記一方の面における正極活物質層が形成されていない周縁部領域と、前記負極部の第二金属箔層の前記一方の面における負極活物質層が形成されていない周縁部領域とが、熱可塑性樹脂を含有してなる周縁封止層を介して接合されていることを特徴とする薄型蓄電デバイス。 - 前記第一金属箔層の他方の面に、該第一金属箔層が露出した第一金属露出部を残した態様で、第一絶縁樹脂フィルムが積層されると共に、
前記第二金属箔層の他方の面に、該第二金属箔層が露出した第二金属露出部を残した態様で、第二絶縁樹脂フィルムが積層されている請求項1に記載の薄型蓄電デバイス。 - 前記第一絶縁樹脂フィルムおよび前記第二絶縁樹脂フィルムが、耐熱性樹脂延伸フィルムで形成されている請求項2に記載の薄型蓄電デバイス。
- 前記第一金属箔層の前記一方の面にバインダー層を介して前記正極活物質層が積層され、前記第二金属箔層の前記一方の面にバインダー層を介して前記負極活物質層が積層され、前記バインダー層は、PVDF、SBR、CMCおよびPANからなる群より選ばれる少なくとも1種のバインダー材で形成されている請求項1〜3のいずれか1項に記載の薄型蓄電デバイス。
- 前記周縁封止層が、熱可塑性樹脂未延伸フィルムで形成されている請求項1〜4のいずれか1項に記載の薄型蓄電デバイス。
- 前記セパレーターと前記正極活物質層の間に電解液が封入され、前記セパレーターと前記負極活物質層の間に電解液が封入されている請求項1〜5のいずれか1項に記載の薄型蓄電デバイス。
- 前記第一金属箔層がアルミニウム箔で形成され、
前記第二金属箔層が、アルミニウム箔、銅箔、ステンレス箔、ニッケル箔またはチタン箔で形成されている請求項1〜6のいずれか1項に記載の薄型蓄電デバイス。 - 前記第一金属箔層における少なくとも前記正極活物質層が積層される側の面に化成皮膜が形成され、前記第二金属箔層における少なくとも前記負極活物質層が積層される側の面に化成皮膜が形成されている請求項1〜7のいずれか1項に記載の薄型蓄電デバイス。
- 第一金属箔層と、該第一金属箔層の一方の面における一部の領域に積層された正極活物質層と、前記第一金属箔層の前記一方の面における正極活物質層が形成されていない周縁部に設けられた第一熱可塑性樹脂層と、を備えた正極側シート体を準備する工程と、
第二金属箔層と、該第二金属箔層の一方の面における一部の領域に積層された負極活物質層と、前記第二金属箔層の前記一方の面における負極活物質層が形成されていない周縁部に設けられた第二熱可塑性樹脂層と、を備えた負極側シート体を準備する工程と、
セパレーターを準備する工程と、
前記正極側シート体と前記負極側シート体とを互いの熱可塑性樹脂層で接触させると共に前記正極活物質層と前記負極活物質層との間に前記セパレーターを挟み込んだ状態で、前記正極側シート体の第一熱可塑性樹脂層と前記負極側シート体の第二熱可塑性樹脂層とをヒートシール接合する工程と、を含むことを特徴とする薄型蓄電デバイスの製造方法。 - 前記第一熱可塑性樹脂層が、熱可塑性樹脂未延伸フィルムで形成され、前記第二熱可塑性樹脂層が、熱可塑性樹脂未延伸フィルムで形成されている請求項9に記載の薄型蓄電デバイスの製造方法。
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JPWO2020066857A1 (ja) * | 2018-09-27 | 2021-08-30 | 日本ゼオン株式会社 | 非水系二次電池接着層用スラリーおよび接着層付き非水系二次電池用電池部材、並びに、非水系二次電池用積層体の製造方法および非水系二次電池の製造方法 |
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JP7553243B2 (ja) | 2020-01-28 | 2024-09-18 | 三洋化成工業株式会社 | 組電池 |
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Also Published As
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DE102015215692A1 (de) | 2016-02-18 |
KR102303986B1 (ko) | 2021-09-17 |
TW201611375A (zh) | 2016-03-16 |
KR20160021716A (ko) | 2016-02-26 |
CN105374959A (zh) | 2016-03-02 |
JP6694246B2 (ja) | 2020-05-13 |
US10079374B2 (en) | 2018-09-18 |
CN105374959B (zh) | 2021-09-07 |
TWI753849B (zh) | 2022-02-01 |
US10756313B2 (en) | 2020-08-25 |
US20160049625A1 (en) | 2016-02-18 |
US20180323410A1 (en) | 2018-11-08 |
CN205159373U (zh) | 2016-04-13 |
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