JP4513385B2 - 二次電池用負極及び二次電池 - Google Patents
二次電池用負極及び二次電池 Download PDFInfo
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- JP4513385B2 JP4513385B2 JP2004108422A JP2004108422A JP4513385B2 JP 4513385 B2 JP4513385 B2 JP 4513385B2 JP 2004108422 A JP2004108422 A JP 2004108422A JP 2004108422 A JP2004108422 A JP 2004108422A JP 4513385 B2 JP4513385 B2 JP 4513385B2
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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
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Description
ホング・リー(Hong Li)他著、「ア ハイ キャパシティ ナノ−シリコン コンポジット アノード マテリアル フォー リチウム リチャージャブル バッテリーズ(A High Capacity Nano-Si Composite Anode Material for Lithium Rechargeable Batteries)」、エレクトロケミカル アンド ソリッドステイト レターズ(Electrochemical and Solid-State Letters)、第2巻、第11号、p547−549
本発明の二次電池用負極について、図面を参照して詳細に説明する。図1は本発明の二次電池用負極の一例を示す断面拡大図である。本発明の二次電池用負極は、図1に示すように、活物質層6と集電体5とからなり、活物質層6は、無機複合粒子1と炭素粒子2とを含有する。本発明の二次電池用負極を用いて二次電池を作製した場合は、電解液7が活物質層6中の粒子間の空隙を埋めることにより電子のやり取りが行われる。
本発明の二次電池は、正極と上述した二次電池用負極とを、セパレータを介して、乾燥空気又は不活性気体雰囲気において積層又は積層したものを捲回した後に容器に封入し、この容器に電解液を注入して作製される。
平均粒径15μmのケイ素酸化物と、金属として平均粒径1μmのFe粒子を用い、ケイ素酸化物中のケイ素と金属との原子数比が3:1となるように配合し、これを遊星型ボールミル装置を用いて、複合化処理を100時間行った。遊星型ボールミル装置中のボールミル容器及び直径10mmのボールはジルコニア製であった。ケイ素酸化物と金属の配合処理及び複合化処理はAr雰囲気で行った。次に、Ar雰囲気中、1100℃で1時間、熱処理を施し、平均粒径5μmの無機複合粒子を得た。
実施例2〜実施例16では、表1に示すような炭素粒子の種類、炭素粒子の形状、炭素粒子の粒径、活物質層の体積充填率、X線の強度比I002/I110、無機複合粒子の粒径、金属の種類、ケイ素酸化物と金属の質量比及び無機複合粒子と炭素粒子の質量比にて二次電池用負極の作製を行った以外は、実施例1と同様の方法で二次電池用負極の作製を行った。また、実施例1と同様の方法にて、二次電池の作製、サイクル試験及びインピーダンス測定を行った。
比較例1として、実施例1で用いた炭素粒子に代えて、式I002/I110=1600を満たし粒径45μmの炭素粒子を用いた以外は、実施例1と同様の方法で二次電池用負極を作製した。また、実施例1と同様の方法にて、二次電池の作製、サイクル試験及びインピーダンス測定を行った。
比較例2として、実施例1で用いた炭素粒子に代えて、式I002/I110=30を満たし粒径50μmの炭素粒子を用い、また、実施例1の3倍のプレス圧にてローラープレスを行って活物質層の体積充填率が20%となるまで加圧成形した以外は、実施例1と同様の方法にて二次電池用負極を作製した。また、実施例1と同様の方法にて、二次電池の作製、サイクル試験及びインピーダンス測定を行った。
実施例1〜16及び比較例1〜2のサイクル試験及びインピーダンス測定の結果を表1に示す。このとき、100サイクル後の容量維持率は、(各サイクルにおける放電容量)/(5サイクル目における放電容量)の計算式にて算出した。また、インピーダンス測定の結果は、100サイクル後の界面抵抗Rを比較例1の界面抵抗Rの値で除した結果で示す。界面抵抗Rは20KHzから50MHzまでの周波数でコールコールプロットを作製した際に虚軸の−Xの値が最大値となるときの実軸の値とした(図6に示す)。
2 炭素粒子
3 ケイ素酸化物
4 金属
5 集電体
6 活物質層
7 電解液
Claims (7)
- 前記活物質層の体積充填率が35〜75%の範囲内であることを特徴とする請求項1に記載の二次電池用負極。
- 前記金属が、Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、Y、Zr、Nb、Mo、Ru、Rh、Pd、Ag、Ta、W、Re、Os、Ir、Pt、Au又はLaであることを特徴とする請求項1又は2に記載の二次電池用負極。
- 前記無機複合粒子中のケイ素の原子数を1としたとき、当該無機複合粒子に含まれる金属の原子数が0.05以上であることを特徴とする請求項1〜3のいずれか1項に記載の二次電池用負極。
- 前記炭素粒子の平均粒径が10μm以下であることを特徴とする請求項1〜4のいずれか1項に記載の二次電池用負極。
- 前記無機複合粒子が、真空蒸着法、スパッタ法又は圧接法を用いて作製されたことを特徴とする請求項1〜5のいずれか1項に記載の二次電池用負極。
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JP5217083B2 (ja) * | 2005-11-15 | 2013-06-19 | 日立化成株式会社 | リチウムイオン二次電池用負極合剤、リチウムイオン二次電池用負極、及びリチウムイオン二次電池 |
JP5185499B2 (ja) * | 2005-11-25 | 2013-04-17 | 公立大学法人大阪府立大学 | 電極用複合体の製造方法 |
JP5039956B2 (ja) * | 2006-09-07 | 2012-10-03 | トヨタ自動車株式会社 | 負極活物質、負極およびリチウム二次電池 |
JP5181002B2 (ja) * | 2009-08-21 | 2013-04-10 | 尾池工業株式会社 | 鱗片状薄膜微粉末分散液又は鱗片状薄膜微粉末、及びこれを用いたペースト、電池用電極、並びにリチウム二次電池 |
US20130011747A1 (en) * | 2010-03-18 | 2013-01-10 | Nec Energy Devices, Ltd. | Lithium ion secondary battery |
JP5177183B2 (ja) * | 2010-07-29 | 2013-04-03 | 株式会社豊田自動織機 | 非水系二次電池用負極活物質の製造方法 |
JP5472263B2 (ja) * | 2011-11-07 | 2014-04-16 | 日立化成株式会社 | リチウムイオン二次電池用負極材の製造方法 |
JP5733190B2 (ja) * | 2011-12-12 | 2015-06-10 | 株式会社豊田自動織機 | 電極の製造方法、製造装置 |
WO2014181447A1 (ja) * | 2013-05-10 | 2014-11-13 | 株式会社 日立製作所 | リチウムイオン二次電池 |
WO2018142682A1 (ja) * | 2017-01-31 | 2018-08-09 | 株式会社村田製作所 | 二次電池用負極、二次電池、電池パック、電動車両、電力貯蔵システム、電動工具および電子機器 |
WO2019188693A1 (ja) * | 2018-03-27 | 2019-10-03 | 日立化成株式会社 | 電解質シート及び二次電池 |
JP6996622B2 (ja) * | 2018-05-31 | 2022-01-17 | 株式会社村田製作所 | 非水電解質二次電池 |
JP7338234B2 (ja) * | 2019-05-21 | 2023-09-05 | 株式会社Gsユアサ | 非水電解質蓄電素子 |
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