JP2014063724A - 二次電池用正極、二次電池、及びその製造方法 - Google Patents
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Abstract
【解決手段】集電体と、集電体上に設けられた活物質層と、を有し、活物質層は、活物質と、グラフェンと、結着剤とを含み、活物質の表面に炭素層を有し、活物質層におけるグラフェンの配合比は、0.1wt%以上1.0wt%以下である二次電池用正極及びこの二次電池用正極を備えた二次電池を提供する。また炭素層、酸化グラフェンを用いて二次電池用正極を製造する。
【選択図】図1
Description
本実施の形態では、本発明の一態様に係る二次電池用正極について、図1を用いて説明する。
本実施の形態においては、実施の形態1で説明した二次電池用正極の製造方法について、図2を用いて説明する。
本実施の形態では、実施の形態1で示した二次電池用正極を用いた種々の二次電池について、図3及び図4を参照して説明する。
図3(A)は、コイン型(単層偏平型)の二次電池の外観図であり、部分的にその断面構造を併せて示した図である。
次に、ラミネート型の二次電池の一例について、図3(B)を参照して説明する。図3(B)では、説明の便宜上、部分的にその内部構造を露出して記載している。
次に、円筒型の二次電池の一例について、図4を参照して説明する。円筒型の二次電池480は図4(A)に示すように、上面に正極キャップ(電池蓋)481を有し、側面及び底面に電池缶(外装缶)482を有している。これら正極キャップ481と電池缶(外装缶)482とは、ガスケット(絶縁パッキン)490によって絶縁されている。
本発明の一態様に係る二次電池は、電力により駆動する様々な電子機器の電源として用いることができる。
次に、携帯型電子機器の一例として携帯情報端末について、図6を用いて説明する。
さらに、電子機器の一例である移動体の例について、図7を用いて説明する。
実施例として、本願発明に係る正極を作製した。以下にその作製方法を示す。
次に、活物質層の構造を視覚的に確認するため、上記の条件で作製した活物質層のSEM(Scanning Electron Microscope)による観察を行った。
上記のように作製した二次電池用正極をハーフセルに組み込み、セルの放電特性を測定した。特性の評価は、CR2032タイプ(直径20mm高さ3.2mm)のコイン形セルの形態で行った。また、負極にはリチウム箔、セパレータには25μm厚のポリプロピレン(PP)膜、電解液には、エチレンカーボネート(EC)とジエチルカーボネート(DEC)とを体積比で1:1の割合で混合した混合溶液中へ六フッ化リン酸リチウム(LiPF6)を1モル/リットルの濃度で溶解したものを用いた。充電は、0.2CのレートでCCCV充電し、上限電圧を4.3Vとした。放電は0.2C、1C、5Cのレート全てについてCC放電により行い、下限電圧は2Vとした。また、測定温度は25℃で行った。下限電圧2Vでの放電容量を最大値とした。
次に、本発明の一態様に係る二次電池用正極について、電極強度の評価を上述の巻き付け試験により評価した。
101 集電体
102 活物質層
103 活物質
104 グラフェン
105 炭素層
450 二次電池
451 正極缶
452 負極缶
453 ガスケット
454 正極
455 正極集電体
456 正極活物質層
457 負極
458 負極集電体
459 負極活物質層
460 セパレータ
470 二次電池
471 正極集電体
472 正極活物質層
473 正極
474 負極集電体
475 負極活物質層
476 負極
477 セパレータ
478 外装体
480 二次電池
481 正極キャップ
482 電池缶
483 正極端子
484 正極
485 セパレータ
486 負極
487 負極端子
488 絶縁板
489 絶縁板
490 ガスケット(絶縁パッキン)
491 PTC素子
492 安全弁機構
500 表示装置
501 筐体
502 表示部
503 スピーカ部
504 二次電池
510 照明装置
511 筐体
512 光源
513 二次電池
514 天井
515 側壁
516 床
517 窓
520 室内機
521 筐体
522 送風口
523 二次電池
524 室外機
530 電気冷凍冷蔵庫
531 筐体
532 冷蔵室用扉
533 冷凍室用扉
534 二次電池
600 タブレット型端末
601 筐体
602 表示部
602a 表示部
602b 表示部
603 表示モード切り替えスイッチ
604 電源スイッチ
605 省電力モード切り替えスイッチ
607 操作スイッチ
608a 領域
608b 領域
609 操作キー
610 キーボード表示切り替えボタン
611 太陽電池
650 充放電制御回路
651 バッテリー
652 DCDCコンバータ
653 コンバータ
660 電気自動車
661 バッテリー
662 制御回路
663 駆動装置
664 処理装置
700 活物質
701 グラフェン
710 放電曲線
711 放電曲線
712 放電曲線
720 放電曲線
721 放電曲線
722 放電曲線
723 放電曲線
724 放電曲線
730 放電曲線
731 放電曲線
Claims (5)
- 集電体と、前記集電体上に設けられた活物質層と、を有し、
前記活物質層は、活物質と、グラフェンと、結着剤とを含み、
前記活物質の表面に炭素層を有し、
前記活物質層における前記グラフェンの配合比は、0.1wt%以上1.0wt%以下であることを特徴とする二次電池用正極。 - 集電体と、前記集電体上に設けられた活物質層と、を有し、
前記活物質層は、活物質と、グラフェンと、結着剤とを含み、
前記活物質の表面に炭素層を有し、
直径6mmの円筒を用いた巻き付け試験において、前記集電体と前記活物質層とが剥離せず、
放電レートを1Cとしたときに、放電容量の最大値が140mAh/g以上であり、かつ、測定した放電容量(mAh/g)の区間のうち60%以上の区間で放電曲線がプラトーであることを特徴とする二次電池用正極。 - 請求項1又は請求項2に記載の二次電池用正極を備えた二次電池。
- 請求項3に記載の二次電池を搭載した電子機器。
- 活物質の表面に炭素層を被覆し、
前記炭素層を被覆した活物質と、酸化グラフェンと、結着剤とを、前記酸化グラフェンの配合比が0.2wt%以上1.0wt%以下として混練することで混合物を形成し、
前記混合物を集電体上に配置し、
前記酸化グラフェンを還元して、グラフェンを含む活物質層を形成することを特徴とする二次電池用正極の製造方法。
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020004738A (ja) * | 2015-01-09 | 2020-01-09 | 株式会社半導体エネルギー研究所 | 活物質の作製方法 |
KR20200058373A (ko) * | 2016-11-18 | 2020-05-27 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 양극 활물질, 및 양극 활물질의 제작 방법, 그리고 이차 전지 |
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KR20220035359A (ko) * | 2016-11-18 | 2022-03-22 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 양극 활물질, 및 양극 활물질의 제작 방법, 그리고 이차 전지 |
KR20200096475A (ko) * | 2016-11-18 | 2020-08-12 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 양극 활물질, 및 양극 활물질의 제작 방법, 그리고 이차 전지 |
KR102557406B1 (ko) * | 2016-11-18 | 2023-07-18 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 양극 활물질, 및 양극 활물질의 제작 방법, 그리고 이차 전지 |
KR20200058373A (ko) * | 2016-11-18 | 2020-05-27 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 양극 활물질, 및 양극 활물질의 제작 방법, 그리고 이차 전지 |
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KR102204284B1 (ko) | 2021-01-18 |
KR20210007025A (ko) | 2021-01-19 |
US20140057165A1 (en) | 2014-02-27 |
KR20230030607A (ko) | 2023-03-06 |
CN103633294A (zh) | 2014-03-12 |
CN103633294B (zh) | 2018-02-23 |
KR20200097230A (ko) | 2020-08-18 |
KR20220024267A (ko) | 2022-03-03 |
US20220059824A1 (en) | 2022-02-24 |
KR102502707B1 (ko) | 2023-02-23 |
KR20200024807A (ko) | 2020-03-09 |
JP6207923B2 (ja) | 2017-10-04 |
US20160308200A1 (en) | 2016-10-20 |
US9385366B2 (en) | 2016-07-05 |
US11108038B2 (en) | 2021-08-31 |
KR20140027881A (ko) | 2014-03-07 |
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