JP6474190B2 - リチウム二次電池用負極、これを含むリチウム二次電池およびリチウム二次電池の製造方法 - Google Patents
リチウム二次電池用負極、これを含むリチウム二次電池およびリチウム二次電池の製造方法 Download PDFInfo
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- JP6474190B2 JP6474190B2 JP2013093954A JP2013093954A JP6474190B2 JP 6474190 B2 JP6474190 B2 JP 6474190B2 JP 2013093954 A JP2013093954 A JP 2013093954A JP 2013093954 A JP2013093954 A JP 2013093954A JP 6474190 B2 JP6474190 B2 JP 6474190B2
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- negative electrode
- lithium secondary
- secondary battery
- sei film
- sei
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Images
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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H—ELECTRICITY
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Description
前記化成工程後、2.7V〜3.0Vの間で前記リチウム二次電池の放電時、前記SEI被膜は、前記SEI被膜総量に対してLiFを10〜50質量%含むことができる。
平均粒径5μmであるソフトカーボン、カーボンブラック、スチレン−ブタジエンラバーおよびカルボキシメチルセルロースをそれぞれ92:4:2:2の質量比に混合して負極活物質層組成物を製造した。前記負極活物質層組成物を銅箔にコーティングして乾燥および圧延後、負極を製造した。前記負極の対極(counter electrode)としてリチウム金属を使用して、前記負極と前記リチウム金属を電池容器に投入し電解液を注入してコインセルを製造した。この時、前記電解液としては、エチレンカーボネート(EC)、ジメチルカーボネート(DMC)およびジエチルカーボネート(DEC)の混合体積比が3:3:4である混合溶液に1.2M濃度のLiPF6が溶解されたものを使用した。
実施例1で前記コインセルをリチウム金属対比0.5Vで3時間充電した後、0.35V〜0.8V範囲で0.1C/0.1C充放電する方式で10回遂行して化成工程を行ったことを除いては、実施例1と同様な方法でコインセルを製造して化成工程を行った。
実施例1で前記コインセルをリチウム金属対比0.5Vで1時間充電した後、0.35V〜0.8V範囲で0.1C/0.1C充放電する方式で10回遂行して化成工程を行ったことを除いては、実施例1と同様な方法でコインセルを製造して化成工程を行った。
実施例1で化成工程を行わないことを除いては、実施例1と同様な方法でコインセルを製造した。
実施例1で前記コインセルをリチウム金属対比1.6Vで1時間充電した後、0.1V〜1.6V範囲で0.1C/0.1C充放電する方式で10回遂行して化成工程を行ったことを除いては、実施例1と同様な方法でコインセルを製造して化成工程を行った。
実施例1で前記コインセルをリチウム金属対比0.1Vで1時間充電した後、0.1V〜1.6V範囲で0.1C/0.1C充放電する方式で10回遂行して化成工程を行ったことを除いては、実施例1と同様な方法でコインセルを製造して化成工程を行った。
平均粒径10μmである黒鉛、スチレン−ブタジエンラバーおよびカルボキシメチルセルロースをそれぞれ98:1:1の質量比に混合して負極活物質層組成物を製造したことを除いては、実施例1と同様な方法でコインセルを製造して化成工程を行った。
実施例4で前記コインセルをリチウム金属対比0.5Vで3時間充電した後、0.35V〜0.8V範囲で0.1C/0.1C充放電する方式で10回遂行して化成工程を行ったことを除いては、実施例4と同様な方法でコインセルを製造して化成工程を行った。
実施例4で前記コインセルをリチウム金属対比0.5Vで1時間充電した後、0.35V〜0.8V範囲で0.1C/0.1C充放電する方式で10回遂行して化成工程を行ったことを除いては、実施例4と同様な方法でコインセルを製造して化成工程を行った。
実施例4で化成工程を行わないことを除いては、実施例4と同様な方法でコインセルを製造した。
前記実施例1〜6および比較例1〜4で化成工程済みの負極表面に形成されたSEI被膜の組成および厚さを測定して、その結果を下記表1に示した。
前記実施例1〜6および比較例1〜4で化成工程済みのリチウム二次電池を充放電して、その結果を下記表1に示した。
112…負極
113…セパレータ
114…正極
120…電池容器
140…封入部材
Claims (8)
- CuKα線を用いたX線回折パターンにおいて、20度〜30度で(002面)のピークを有する炭素系物質を含む負極活物質を含み、
LiF、Li2O、Li2CO3およびLixPFyO(0<x≦1、1≦y≦4)から選択される少なくとも一つを含む無機物を含み、10nm〜50nmの平均厚さを有するSEI被膜を表面に含み、
前記SEI被膜は、前記SEI被膜総量に対してLiFを30〜70質量%含む、リチウム二次電池用負極。 - 前記炭素系物質は、ソフトカーボンおよび黒鉛から選択される少なくとも一つを含む、請求項1に記載のリチウム二次電池用負極。
- 前記炭素系物質は、1μm〜20μmの平均粒径を有する、請求項1に記載のリチウム二次電池用負極。
- 前記SEI被膜の総厚さを二等分して二つの層に分ける場合、前記SEI被膜の表面から内部の前記負極活物質方向に第1層、および第2層という時、
前記SEI被膜の第1層は、前記第1層の総量に対してLiFを60〜70質量%含み、
前記SEI被膜の第2層は、前記第2層の総量に対してLiFを0.1〜10質量%含む、請求項1に記載のリチウム二次電池用負極。 - 正極;
請求項1〜4のいずれか一項に記載の負極;および
電解液を含む、リチウム二次電池。 - 前記負極表面のSEI被膜は、リチウム金属対比0.35V〜0.8V領域で前記リチウム二次電池を数回充電および放電する化成工程を経ることによって形成される、請求項5に記載のリチウム二次電池。
- 前記正極は、活性炭を含む正極活物質を含む、請求項5に記載のリチウム二次電池。
- 正極および負極を含む電極組立体と電解液を電池容器に投入して電池を製造する段階;および
リチウム金属対比0.35V〜0.8V領域で前記電池を数回充電および放電する化成工程を経ることによって、有機物および無機物から選択される少なくとも一つの物質を含み、10nm〜50nmの平均厚さを有するSEI被膜が前記負極の表面に形成される段階を含み、
前記負極は、CuKα線を用いたX線回折パターンにおいて、20度〜30度で(002面)のピークを有する炭素系物質を含む負極活物質を含み、
前記SEI被膜は、前記SEI被膜総量に対してLiFを30〜70質量%含む、リチウム二次電池の製造方法。
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KR100467705B1 (ko) | 2002-11-02 | 2005-01-24 | 삼성에스디아이 주식회사 | 무기 보호막을 갖는 세퍼레이타 및 이를 채용한 리튬 전지 |
KR100544515B1 (ko) * | 2003-02-06 | 2006-01-24 | 주식회사 엘지화학 | 고효율 리튬 이차 전지 |
KR100471984B1 (ko) | 2003-04-02 | 2005-03-10 | 삼성에스디아이 주식회사 | 비수성 전해질 및 이를 포함하는 리튬 이차 전지 |
KR100471973B1 (ko) | 2003-04-03 | 2005-03-10 | 삼성에스디아이 주식회사 | 비수성 전해질 및 이를 포함하는 리튬 이차 전지 |
KR100703845B1 (ko) | 2004-12-28 | 2007-04-04 | 제일모직주식회사 | 리튬이차전지용 비수전해액 및 그를 포함하는 리튬이차전지 |
KR100684733B1 (ko) * | 2005-07-07 | 2007-02-20 | 삼성에스디아이 주식회사 | 리튬 이차 전지 |
KR101182273B1 (ko) | 2010-08-12 | 2012-09-12 | 삼성에스디아이 주식회사 | 리튬 이차 전지용 음극 활물질, 이의 제조 방법 및 이를 포함하는 리튬 이차 전지 |
KR20120016840A (ko) * | 2010-08-17 | 2012-02-27 | 삼성에스디아이 주식회사 | 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지 |
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KR20130122469A (ko) | 2013-11-07 |
US9793539B2 (en) | 2017-10-17 |
EP2660902A1 (en) | 2013-11-06 |
KR101683206B1 (ko) | 2016-12-06 |
CN103378349B (zh) | 2017-06-23 |
US20130288130A1 (en) | 2013-10-31 |
JP2013232413A (ja) | 2013-11-14 |
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