JP2015503836A - ケイ素系物質と炭素材を含む負極、及びこれを含むリチウム二次電池 - Google Patents
ケイ素系物質と炭素材を含む負極、及びこれを含むリチウム二次電池 Download PDFInfo
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Abstract
Description
−スリット(slit):発散スリット=1度、受信スリット=0.1mm、散乱スリット=1度
−測定区域及びステップ角度/測定時間:
(110)面:76.5度<2θ<78.5度、0.01度/3秒
(004)面:53.5度<2θ<56.0度、0.01度/3秒、ここで、2θは回折角度を現わす。前記XRD測定は一つの例として、他の測定方法もまた用いられることができ、前記のような方法で負極の配向指数を測定することができる。
負極の製造
負極活物質としては、5μmのSiO及び表面に非晶質炭素がコーティングされた黒煙を10:90の重量比で混合したものを用いており、導電剤としてアセチレンブラック、バインダとしてスチレン−ブタジエンゴム(SBR)、増粘剤としてカルボキシメチルセルロース(CMC)を88:2:5:5の重量比で混合した後、蒸留水に混合して負極活物質スラリーを製造した。
黒煙表面に非晶質炭素の表面コーティングの量が7重量%であることを除いては、実施例1と同じ方法で負極を製造する。このとき、1.6g/ccの負極密度において負極の配向指数は0.12であった。
黒煙表面に非晶質炭素の表面コーティングの量が10重量%であることを除いては、実施例1と同じ方法で負極を製造する。このとき、1.6g/ccの負極密度において負極の配向指数は0.17であった。
正極活物質としてLiCoO2を用いており、導電剤としてアセチレンブラック、バインダとしてポリビニリデンフルオライド(PVdF)を94:3.5:2.5の重量比で混合した後、NMPに添加して正極活物質スラリーを製造した。製造されたスラリーをアルミニウムホイルの一面にコーティングし、乾燥及び圧延した後、一定の大きさにパンチングして正極を製造した。
非晶質炭素がコーティングされない黒煙及びSiOを用いたことを除いては、前記実施例1と同じ方法で負極を製造した。このとき、1.6g/ccの電極密度において負極の配向指数は0.06であった。
非晶質炭素がコーティングされた黒煙及び黒煙を用いたことを除いては、前記実施例1と同じ方法で負極を製造した。このとき、1.6g/ccの電極密度において負極の配向指数は0.07であった。
非晶質炭素がコーティングされない片状黒煙活物質を用いたことを除いては、実施例1と同じ方法で負極を製造する。このとき、1.6g/ccの負極密度において負極の配向指数は0.04であった。
黒煙表面に非晶質炭素の表面コーティングの量が25重量%である活物質を用いたことを除いては、実施例1と同じ方法で負極を製造する。このとき、1.8g/ccの負極密度において負極の配向指数は0.11であった。(過度なコーティングの量によりプレス特性が良くないため、すなわち、よく押されないため1.6g/ccの負極密度で測定されない)
黒煙表面に非晶質炭素の表面コーティングの量が30重量%である活物質を用いたことを除いては、実施例1と同じ方法で負極を製造する。このとき、1.8g/ccの負極密度において負極の配向指数は0.15であった。(過度なコーティングの量によりプレス特性が良くないため、すなわち、よく押されないため1.6g/ccの負極密度で測定されない)
前記それぞれの比較例1ないし5で製造された負極を用いたことを除いては、前記実施例4ないし6と同じ方法でリチウム二次電池を製造した。
リチウム二次電池の寿命特性及び厚さ変化率の分析
前記実施例4ないし6、及び比較例6及び8ないし10で製造されたリチウム二次電池の寿命特性及び厚さ変化率を調べるために下記のような実験を施した。
リチウム二次電池の初期放電容量の分析
前記実施例4ないし6、及び比較例6ないし10で製造されたリチウム二次電池の初期放電容量及び50サイクル後の電極体積当たりの放電容量を調べるため、実施例4ないし6及び比較例6ないし10で製造されたリチウム二次電池を5mVまで定電流(0.5C)で充電した後、5mVで電流が0.005Cに到逹するまで停電した後、終了した。電池の放電は1.0Vまで定電流(0.5C)で放電した。最終50サイクル目では充電状態で終了した後、セルを分解して厚さを測定しており、得られた厚さで電極の体積を計算した。
Claims (10)
- 負極であって、
SiOx(0<x≦1)及び表面に非晶質炭素がコーティングされた炭素材を含む負極活物質を備えてなり、
配向指数が0.07〜0.17である、負極。 - 前記負極の密度が、1.5g/cc〜1.6g/ccであることを特徴とする、請求項1に記載の負極。
- 前記炭素材が、天然黒煙、人造黒煙、メゾカーボンマイクロビーズ(MCMB)、炭素繊維及びカーボンブラックからなる群から選択される一種又は二種以上の混合物を含むことを特徴とする、請求項1又は2に記載の負極。
- 前記配向指数が、負極に含まれた負極活物質の(110)面と(004)面をXRDで測定し、それぞれの測定されたXRDピークを積分して得られた面積比((110)/(004))であることを特徴とする、請求項1〜3の何れか一項に記載の負極。
- 前記SiOx(0<x≦1)対前記表面に非晶質炭素がコーティングされた炭素材の重量比が、3〜70:97〜30であることを特徴とする、請求項1〜4の何れか一項に記載の負極。
- 前記SiOxが、一酸化ケイ素であることを特徴とする、請求項1〜5の何れか一項に記載の負極。
- 前記非晶質炭素が、ハードカーボン、ソフトカーボン又はこれらの混合物を含むことを特徴とする、請求項1〜6の何れか一項に記載の負極。
- 前記非晶質炭素が、前記炭素材を基準に0.1〜20重量%で含まれることを特徴とする、請求項1〜7の何れか一項に記載の負極。
- 前記非晶質炭素のコーティング厚さが、10nm〜700nmであることを特徴とする、請求項1〜8の何れか一項に記載の負極。
- リチウム二次電池であって、
正極と、負極と、及び前記正極と前記負極との間に介在されたセパレータとを備えてなり、
前記負極が、請求項1〜9の何れか一項に記載のものであることを特徴とする、リチウム二次電池。
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KR10-2012-0058785 | 2012-05-31 | ||
KR10-2013-0054277 | 2013-05-14 | ||
KR1020130054277A KR101552763B1 (ko) | 2012-05-31 | 2013-05-14 | 규소계 물질과 탄소재를 포함하는 음극 및 이를 포함하는 리튬 이차전지 |
PCT/KR2013/004301 WO2013180411A1 (ko) | 2012-05-31 | 2013-05-15 | 규소계 물질과 탄소재를 포함하는 음극 및 이를 포함하는 리튬 이차전지 |
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JP2022514807A (ja) * | 2019-11-28 | 2022-02-16 | 寧徳新能源科技有限公司 | 負極、並びに、それを含む電気化学装置及び電子装置 |
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EP2834192B1 (en) | 2012-04-05 | 2018-01-03 | Imerys Graphite & Carbon Switzerland Ltd. | Surface-oxidized low surface area graphite, processes for making it, and applications of the same |
US20150236343A1 (en) * | 2014-02-18 | 2015-08-20 | GM Global Technology Operations LLC | Coated electrodes for lithium batteries |
JP6565899B2 (ja) * | 2014-03-27 | 2019-08-28 | 三洋電機株式会社 | 非水電解質二次電池 |
KR102234287B1 (ko) * | 2014-08-08 | 2021-03-31 | 삼성에스디아이 주식회사 | 음극 활물질, 이를 채용한 음극과 리튬 전지, 및 상기 음극 활물질의 제조방법 |
KR101895116B1 (ko) * | 2016-03-29 | 2018-09-04 | 주식회사 엘지화학 | 음극 슬러리의 제조방법 |
KR102104492B1 (ko) * | 2016-06-02 | 2020-04-24 | 주식회사 엘지화학 | 음극 활물질, 이의 제조방법, 이를 포함하는 음극 및 이를 포함하는 리튬이차전지 |
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WO2013180411A1 (ko) | 2013-12-05 |
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EP2731179B1 (en) | 2017-12-06 |
KR101552763B1 (ko) | 2015-09-11 |
EP2731179A4 (en) | 2015-10-28 |
EP2731179A1 (en) | 2014-05-14 |
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