JP2009152037A - リチウム二次電池 - Google Patents
リチウム二次電池 Download PDFInfo
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- JP2009152037A JP2009152037A JP2007328483A JP2007328483A JP2009152037A JP 2009152037 A JP2009152037 A JP 2009152037A JP 2007328483 A JP2007328483 A JP 2007328483A JP 2007328483 A JP2007328483 A JP 2007328483A JP 2009152037 A JP2009152037 A JP 2009152037A
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- Prior art keywords
- negative electrode
- lithium secondary
- secondary battery
- separator
- layer
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Images
Classifications
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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
Abstract
【解決手段】 負極合剤層を有する負極、正極合剤層を有する正極およびセパレータにより構成される電極体を備えたリチウム二次電池であって、前記負極合剤層は、LIと合金化が可能な元素または前記元素を有する化合物である負極活物質と、ポリイミド、ポリアミドイミドおよびポリアミドよりなる群から選択される少なくとも1種のバインダとを含有しており、前記セパレータは、前記負極の負極合剤層および前記正極の正極合剤層の少なくとも一方と接着していることを特徴とするリチウム二次電池により、前記課題を解決する。
【選択図】 図3
Description
<セパレータの作製>
80℃に加熱したキシレン中にポリエチレン(融点120℃)およびポリプロピレン(融点160℃)を溶解させた後、この溶液にLLDPE(融点117℃)を混合して充分に攪拌し、得られた混合溶液をポリエチレンテレフタレートフィルム上にキャストし、キシレンを蒸発させて製膜した。なお、前記混合用液中の各ポリオレフィンの比率は、質量比で、ポリエチレン:ポリプロピレン:LLDPE=45:45:10とした。得られた膜を逐次二軸延伸法により厚みが25μm、空孔率が40%となるように調整して、セパレータを得た。得られたセパレータは、5m×40mmの長尺サイズとなるように裁断した。
正極活物質としてLiCoO2(セイミケミカル製、平均粒径10μm):96質量部、導電助剤としてケッチェンブラック:2質量部、バインダとしてPVDF[呉羽化学製「#1120」(商品名)]:2質量部を、プラネタリミキサーを用いて50rpmで30分間混練して正極合剤を調製し、更に粘度が5000±1000cpsになるまで三菱化学製N−メチル−2−ピロリドン(NMP)を添加して減圧混練を行って正極合剤含有組成物を調製した。得られた組成物をアルミニウム箔(15μm厚み)上にギャップ210μmのアプリケーターバーを用いて塗布し、85℃のホットプレート上で10分間NMPを蒸発させ、更に炉内温度を100℃に設定した真空乾燥機内に15時間静置して乾燥させNMPを完全に除去して、アルミニウム箔からなる集電体上に正極合剤層を形成した。この電極を、正極合剤層の密度が3.55g/cm3になるまでカレンダーロールプレス機により加圧成形して、正極合剤層の形成エリアが表面316mm長×36mm、裏面247mm長×36mm幅のサイズになるように切断して、帯状の正極を得た。
SiO(平均粒径1.0μm)を原料とし、攪拌式の転動造粒機[ホソカワミクロン製「アグロマスタ」(商品名)]を用いて、SiOの複合粒子を得た。この複合粒子の平均粒径は20μmであった。続いて、前記複合粒子10gを沸騰床反応器中で約1000℃に加熱し、加熱された複合粒子にベンゼンと窒素ガスとからなる25℃の混合ガスを接触させ、1000℃で60分間CVD処理を行った。このようにして、前記混合ガスが熱分解して生じた炭素を複合粒子に堆積させて被覆層を形成し、負極材料を得た。
前記の帯状正極と帯状負極の間に、前記のセパレータを配置し、扁平状に巻回して扁平状巻回電極体とし、更に100℃に加熱したヒートプレス機で10kgf/cm2で1分間の熱プレスを行い、セパレータを正極合剤層および負極合剤層と接着させた後に、厚み4mm×幅34mm×高さ43mmの有底角筒形の外装缶内に挿入し、封口体と正極リード体および負極リード体をレーザー溶接法によって溶接した。
扁平状巻回電極体の作製後、ヒートプレス機での熱プレスを行わなかった以外は、実施例1と同様にして角形のリチウム二次電池を作製した。
2 負極
3 セパレータ
Claims (6)
- 負極合剤層を有する負極、正極合剤層を有する正極およびセパレータにより構成される電極体を備えたリチウム二次電池であって、
前記負極合剤層は、Liと合金化が可能な元素または前記元素を有する化合物である負極活物質と、ポリイミド、ポリアミドイミドおよびポリアミドよりなる群から選択される少なくとも1種のバインダとを含有しており、
前記セパレータは、前記負極の負極合剤層および前記正極の正極合剤層の少なくとも一方と接着していることを特徴とするリチウム二次電池。 - 負極の含有するポリイミド、ポリアミドイミドまたはポリアミドが、分子鎖中に芳香環を有するものである請求項1に記載のリチウム二次電池。
- 負極活物質が、SiとOを構成元素に含む化合物(ただし、Siに対するOの原子比xは、0.5≦x≦1.5である)であり、かつ該化合物の表面が炭素で被覆されている請求項1または2に記載のリチウム二次電池。
- セパレータは、樹脂製の基材層と、該基材層の少なくとも一方の表面に前記基材層の構成樹脂よりも融点の低い樹脂で構成された融着層とを有している請求項1〜3のいずれかに記載のリチウム二次電池。
- セパレータの基材層および融着層がポリオレフィン系樹脂により構成されている請求項4に記載のリチウム二次電池。
- 角筒形の外装缶またはラミネートフィルム外装体を有するものである請求項1〜5のいずれかに記載のリチウム二次電池。
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JP2014026986A (ja) * | 2013-10-04 | 2014-02-06 | Hitachi Maxell Ltd | リチウム二次電池用セパレータ、並びにリチウム二次電池およびその製造方法 |
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JP2015523699A (ja) * | 2012-10-26 | 2015-08-13 | 華為技術有限公司Huawei Technologies Co.,Ltd. | リチウムイオン電池負極添加剤及びその作製方法、リチウムイオン電池負極シート並びにリチウムイオン電池 |
US10084189B2 (en) | 2012-10-26 | 2018-09-25 | Huawei Technologies Co., Ltd. | Lithium ion battery cathode additive, fabrication method thereof, lithium ion battery cathode sheet and lithium ion battery |
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