JP6342697B2 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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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
-
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Electrode And Active Subsutance (AREA)
Description
本発明の実施形態に係る非水電解質二次電池(以下、二次電池と称する)の構造について、リチウムイオン二次電池を例示して説明する。
二次電池1の製造方法について説明する。本発明の範囲としては、正負極いずれか一方に特徴を持つ場合も含むが、ここでは、正極負極両方に本発明の特徴を適用した場合を例示する。まず、正極板41を作製する。正極活物質と、ポリフッ化ビニリデンと、N−メチルピロリドン(NMP)等の溶剤と、必要に応じて導電助剤および他の結着剤と、を混合して、正極形成用スラリーを得る(工程1)。
具体的な実施例をあげて、本発明の実施形態に係る非水電解質二次電池について、さらに詳細に説明する。実施例では、負極と対向する正極活物質層の主面が200mm×220mmの正極板を用い、正極と対向する負極活物質層の主面が正極活物質層の主面よりも大きい負極板(204mm×224mm)を用いた。また、実施例では、負極集電体上に設けられる負極活物質層にポリフッ化ビニリデンを含有させ、負極活物質層の示差走査熱量測定で測定されるDSC曲線において、120℃から160℃の範囲に現れるポリフッ化ビニリデンの吸熱ピークが140℃以上の温度領域に現れる負極板を作成した。
第一の正極活物質としてスピネル構造を有するLi1.1Mn1.9O4粉末と、第二の正極活物質)としてリチウム・ニッケル・コバルト・マンガン酸リチウム(Ni/Liモル比0.7)と、結着剤樹脂としてポリフッ化ビニリデンと、導電助剤としてカーボンブラック粉末とを、固形分質量比で69:23:4:4の割合で、溶媒であるN−メチル−2−ピロリドン(NMP)中に添加することで正極スラリーを調製した。
負極活物質として非晶質性炭素で被覆された球状天然黒鉛粉末と、フッ素樹脂系結着剤樹脂としてポリフッ化ビニリデンと、カーボンブラック系導電助剤とを、固形分質量比で96.5:3:0.5の割合でN−メチル−2−ピロリドン(NMP)中に添加し、攪拌させることで、これらの材料をNMP中に均一に分散させて負極スラリーを作製した。
負極板、セパレータおよび正極板を順次積して発電要素を構成した。この発電要素を電解質とともに外装体の内部に収容し、実施例1の二次電池を作製した。
実施例2の二次電池は、負極板の熱処理温度が異なること以外は、実施例1と同じ方法で二次電池を作製した。実施例2では、負極スラリーを塗布し乾燥させた負極板を、真空雰囲気下145℃で2時間熱処理を行った。
比較例1の二次電池は、負極板の熱処理温度が異なること以外は、実施例1と同じ方法で二次電池を作製した。比較例1では、負極スラリーを塗布し乾燥させた負極板を、真空雰囲気下120℃で2時間熱処理を行った。
比較例2の二次電池は、正極活物質層の面積と負極活物質層の面積が異なること以外は、比較例1と同じ方法で二次電池を作製した。比較例2の正極活物質層のサイズは、40mm×24mmであった。負極活物質層のサイズは、42mm×26mmであった。
実施例1,2および比較例1,2の負極活物質層に対して、示差走査熱量測定を行った。示差走査熱量測定は、ティー・エイ・インスツルメント・ジャパン株式会社製のQ20を用いて、5℃/minのスキャンスピードで行った。図3に、示差走査熱量測定により得られるDSC曲線の120℃〜160℃の部分を示す。なお、図3には、ベースライン補正を行い、吸熱ピークの麓を水平化したDSC曲線を示す。また、160℃以上の領域にポリフッ化ビニリデンの融解による大きな吸熱ピークがあるが、図3に示しているピークはそれとは別の、比較的小さな吸熱ピークであり、何らかの結晶状態の変化に起因していると思われる。
2…正極端子
3…負極端子
4…電池要素
41…正極板
41a…正極集電体
41b,41c…正極活物質層
42…負極板
42a…負極集電体
42b,42c…負極活物質層
43…セパレータ
5…外装体
51…熱融着層
52…金属層
53…保護層
Claims (2)
- 正極活物質層を有する正極と、負極活物質層を有する負極とを具備し、前記正極活物質層と負極活物質層とをセパレータを介して対向配置した発電要素を有する非水電解質二次電池であって、
前記正極活物質層および前記負極活物質層の対向する主面のうち、小さい面積を有する活物質層の主面は、短辺の長さが132mm以上の矩形であり、
前記負極活物質層、または前記負極活物質層と前記正極活物質層の両方は、
活物質と、
活物質層の示差走査熱量測定で測定されるDSC曲線において、120℃から160℃の範囲に現れるポリフッ化ビニリデンの吸熱ピークが140℃以上の温度領域に現れるポリフッ化ビニリデンと、を少なくとも含有する、
ことを特徴とする非水電解質二次電池。 - 前記発電要素を電解質とともに外装体に収容し、
前記短辺の長さが132mm以上の矩形の主面を有する活物質層の各辺と前記外装体の内周面との間に前記電解質を充填する
ことを特徴とする請求項1に記載の非水電解質二次電池。
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JPH10270016A (ja) * | 1997-03-24 | 1998-10-09 | Sanyo Electric Co Ltd | 非水電解液二次電池 |
JP5553165B2 (ja) * | 2010-11-11 | 2014-07-16 | トヨタ自動車株式会社 | 非水二次電池とその製造方法 |
JP5725362B2 (ja) * | 2011-09-26 | 2015-05-27 | トヨタ自動車株式会社 | リチウム二次電池とその製造方法 |
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