JP2005044785A - 正極活物質及びこれを利用したリチウム二次電池 - Google Patents
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Abstract
【解決手段】 ラマンスペクトル分においてスピネル構造のA1g振動モードのピーク強度対六方晶系構造のA1g振動モードのピーク強度の比が1:0.1〜1:0.4であり、六方晶系構造のA1g振動モードのピーク強度対Eg振動モードのピーク強度の比が1:0.9〜1:3.5であり、スピネル構造のA1g振動モードのピーク強度対F2g振動モードのピーク強度の比が1:0.2〜1:0.4であることを特徴とし、優秀なサイクル寿命特性及び充放電特性を示す下記化学式1の正極活物質、及びこれを使用した非水系リチウム二次電池:
[化学式1]
LixCoyM1−yA2
前記式で、0.95≦x≦1.0、0≦y≦1であり、MはNi、Fe、Pb、Mg、Al、K、Na、Ca、Si、Ti、Sn、V、Ge、Ga、B、As、Zr、Mn及びCrからなる群から選択される少なくとも1種以上の元素であり、AはO、F、S及びPからなる群から選択される元素である。
【選択図】 図3
Description
[化学式1]
LixCoyM1−yA2
前記式で、0.95≦x≦1.0、0≦y≦1であり、MはNi、Fe、Pb、Mg、Al、K、Na、Ca、Si、Ti、Sn、V、Ge、Ga、B、As、Zr、Mn及びCrからなる群から選択される少なくとも1種以上の元素であり、AはO、F、S及びPからなる群から選択される元素である。
[化学式1]
LixCoyM1−yA2
前記式で、0.95≦x≦1.0、0≦y≦1であり、MはNi、Fe、Pb、Mg、Al、K、Na、Ca、Si、Ti、Sn、V、Ge、Ga、B、As、Zr、Mn、及びCrからなる群から選択される少なくとも1種以上の元素であり、AはO、F、S及びPからなる群から選択される元素である。
Co3O4:48g、Li2CO3:23gを秤量した後混合した。前記混合物を800℃で焼成した。得られた焼成物を粉砕、分級してリチウムコバルト系酸化物(サンプル1)を得た。この場合、Niの含有量は159ppmであった。
Ni含有量を24ppm(サンプル2)と623ppm(サンプル3)としたことを除いては、前記製造例1と同じ方法で製造した。
前記製造例1〜3で製造したリチウムコバルト系酸化物をそれぞれ100g、結着剤であるポリビニリデンフルオライド5g、及び導電剤であるカーボンブラック10gをN−メチル−2−ピロリドン100gに加え、約10時間ボールミーリングして正極材料を製造した。前記正極材料を、ギャップ250μmのドクターブレードを使用し、厚さ15μm幅30cmのアルミニウム薄膜上にコーティングし、乾燥及び圧延した後所定寸法に切断して正極板を製造した。
正極活物質として、Ni含有量が10ppm以下のものを使用したことを除いては、実施例1と同じ方法でリチウム二次電池を製造した。
前記実施例1〜3で製造したリチウム二次電池を、1回充放電した後、正極板を分離し、650℃で10分間加熱して正極活物質及びカーボン類だけにした。
実施例1〜3及び比較例で製造した公称容量1800mAhである円筒形リチウム二次電池それぞれを、1800mAの電流で4.2Vまで定電流−定電圧(CCV)条件で充電して30分間放置した後、1800mAの電流で2.75VまでCCV条件で放電した。このような工程を反復して充放電寿命特性を測定した。結果を図4に示した。
Claims (8)
- 下記化学式1のリチウム系正極活物質であり、ラマンスペクトル分析においてスピネル構造のA1g振動モードのピーク強度対六方晶系構造のA1g振動モードのピーク強度の比が1:0.1〜1:0.4であり、六方晶系構造のA1g振動モードのピーク強度対Eg振動モードのピーク強度の比が1:0.9〜1:3.5であり、スピネル構造のA1g振動モードのピーク強度対F2g振動モードのピーク強度の比が1:0.2〜1:0.4である正極活物質:
[化学式1]
LixCoyM1−yA2
前記式で、0.95≦x≦1.0、0≦y≦1であり、MはNi、Fe、Pb、Mg、Al、K、Na、Ca、Si、Ti、Sn、V、Ge、Ga、B、As、Zr、Mn及びCrからなる群から選択される少なくとも1種以上の元素であり、AはO、F、S及びPからなる群から選択される元素である。 - ニッケルが10〜1000ppmの量で存在することを特徴とする請求項1に記載の正極活物質。
- ラマンスペクトル分析おいて六方晶系構造を有する前記化学式1のリチウム系化合物のA1g振動モードの半値幅が12.8〜13.6であり、Eg振動モードの半値幅が9.3〜11.3であることを特徴とする請求項1に記載の正極活物質。
- ラマンスペクトル分析においてスピネル構造を有する前記化学式1のリチウム系化合物のA1g振動モードの半値幅が12.2〜13.0であり、F2g振動モードの半値幅が14.1〜16.6であることを特徴とする請求項1に記載の正極活物質。
- 炭素材料を主材料とする負極と、
リチウム系化合物からなる正極活物質を含む正極と、
前記負極と前記正極間に介在するセパレータと、
液体電解質または高分子電解質を含み、
前記正極活物質は下記化学式1のリチウム系正極活物質であり、ラマンスペクトル分析においてスピネル構造のA1g振動モードのピーク強度対六方晶系構造のA1g振動モードのピーク強度の比が1:0.1〜1:0.4であり、六方晶系構造のA1g振動モードのピーク強度対Eg振動モードのピーク強度の比が1:0.9〜1:3.5であり、スピネル構造のA1g振動モードのピーク強度対F2g振動モードのピーク強度の比が1:0.2〜1:0.4であることを特徴とするリチウム二次電池:
[化学式1]
LixCoyM1−yA2
前記式で、0.95≦x≦1.0、0≦y≦1であり、MはNi、Fe、Pb、Mg、Al、K、Na、Ca、Si、Ti、Sn、V、Ge、Ga、B、As、Zr、Mn及びCrからなる群から選択される少なくとも1種以上の元素であり、AはO、F、S及びPからなる群から選択される元素である。 - 前記正極活物質にニッケルが10〜1000ppmの量で存在することを特徴とする請求項5に記載のリチウム二次電池。
- ラマンスペクトル分析において六方晶系構造を有する前記化学式1のリチウム系化合物のA1g振動モードの半値幅が12.8〜13.6であり、Eg振動モードの半値幅が9.3〜11.3であることを特徴とする請求項5に記載のリチウム二次電池。
- ラマンスペクトル分析においてスピネル構造を有する前記化学式1のリチウム系化合物のA1g振動モードの半値幅が12.2〜13.0であり、F2g振動モードの半値幅が14.1〜16.6であることを特徴とする請求項5に記載のリチウム二次電池。
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Cited By (8)
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JP2005336000A (ja) * | 2004-05-26 | 2005-12-08 | Toyota Motor Corp | リチウム複合酸化物材料およびその利用 |
WO2007015473A1 (ja) * | 2005-08-01 | 2007-02-08 | Santoku Corporation | 正極活物質、非水電解質電池用正極、非水電解質電池 |
WO2007083457A1 (ja) | 2006-01-20 | 2007-07-26 | Nippon Mining & Metals Co., Ltd. | リチウムニッケルマンガンコバルト複合酸化物及びリチウム二次電池 |
WO2009128289A1 (ja) | 2008-04-17 | 2009-10-22 | 日鉱金属株式会社 | リチウムイオン電池用正極活物質、二次電池用正極及びリチウムイオン電池 |
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WO2019244936A1 (ja) | 2018-06-21 | 2019-12-26 | 株式会社村田製作所 | 正極活物質および電池 |
WO2019244955A1 (ja) | 2018-06-21 | 2019-12-26 | 株式会社Gsユアサ | 非水電解質二次電池用正極活物質、非水電解質二次電池用正極活物質の製造方法、非水電解質二次電池用正極、非水電解質二次電池、非水電解質二次電池の製造方法、及び非水電解質二次電池の使用方法 |
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JP4993891B2 (ja) * | 2005-09-22 | 2012-08-08 | 三洋電機株式会社 | 非水電解質二次電池 |
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WO2007015473A1 (ja) * | 2005-08-01 | 2007-02-08 | Santoku Corporation | 正極活物質、非水電解質電池用正極、非水電解質電池 |
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KR20050012029A (ko) | 2005-01-31 |
CN1577924A (zh) | 2005-02-09 |
KR100563047B1 (ko) | 2006-03-24 |
US20050019661A1 (en) | 2005-01-27 |
US7563540B2 (en) | 2009-07-21 |
CN1288777C (zh) | 2006-12-06 |
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