JP2017016877A - リチウムイオン二次電池 - Google Patents
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Abstract
Description
本発明は、電池の安全性を向上させつつ、容量維持率を維持することができるリチウムイオン電池を提供する。
負極活物質として、表面被覆天然黒鉛粉末、導電助剤としてカーボンブラック粉末、バインダー樹脂としてスチレンブタジエンラバー(SBR)とカルボキシメチルセルロース(CMC)とを、固形分質量比で93:3:2:2の割合でイオン交換水中に添加して撹拌し、これらの材料を水中に均一に分散させてスラリーを作製した。得られたスラリーを、負極集電体となる厚み10μmの銅箔上に塗布した。次いで、125℃にて10分間、電極を加熱し、水を蒸発させることにより負極活物質層を形成した。更に、負極活物質層をプレスすることによって、負極集電体の片面上に負極活物質層を塗布した負極を作製した。
正極活物質として、ニッケル・コバルト・マンガン酸リチウム(NCM811、すなわちニッケル:コバルト:マンガン=8:1:1)とリチウムマンガン酸化物(LiMn2O4)とを25:75(重量比)とを混合した混合酸化物と、導電助剤としてカーボンブラック粉末と、バインダー樹脂としてポリフッ化ビニリデンとを、固形分質量比で90:5:5の割合で、溶媒であるNMPに添加した。さらに、この混合物に有機系水分捕捉剤として無水シュウ酸(分子量90)を、上記混合物からNMPを除いた固形分100質量部に対して0.03質量部添加した上で撹拌することで、これらの材料を均一に分散させてスラリーを作製した。得られたスラリーを、正極集電体となる厚み20μmのアルミニウム箔上に塗布した。次いで、125℃にて10分間、電極を加熱し、NMPを蒸発させることにより正極活物質層を形成した。さらに、正極活物質層をプレスすることによって、正極集電体の片面上に目付20mg/cm2、密度3.0g/cm3の正極活物質層を塗布した正極を作製した。
耐熱微粒子としてアルミナを用いた厚さ5μmの耐熱微粒子層とポリプロピレンからなる厚さ20μmのオレフィン系樹脂層とから構成されるセラミックセパレータを使用した。耐熱微粒子層中に含有されるθ−アルミナの量の異なる複数のセラミックセパレータを用いた。用いたセパレータの種類は、表1に示す。なお実施例3では、厚さ25μmのポリプロピレン単層セパレータを使用した。
エチレンカーボネート(以下、「EC」と称する。)とDECとを、EC:DEC=30:70(体積比)の割合で混合した非水溶媒に、電解質塩としての六フッ化リン酸リチウム(LiPF6)を濃度が1.0mol/Lとなるように溶解させたものに対して、添加剤として環状ジスルホン酸エステル(メチレンメタンジスルホンネート(MMDS)とビニレンカーボネート(VC)とをそれぞれ濃度が1重量%となるように溶解させたものを用いた。
上記のように作製した各負極板と正極板を、各々所定サイズの矩形に切り出した。このうち、端子を接続するための未塗布部にアルミニウム製の正極リード端子を超音波溶接した。同様に、正極リード端子と同サイズのニッケル製の負極リード端子を負極板における未塗布部に超音波溶接した。セパレータの両面に上記負極板と正極板とを両活物質層がセパレータを隔てて重なるように配置して電極板積層体を得た。2枚のアルミニウムラミネートフィルムの長辺の一方を除いて三辺を熱融着により接着して袋状のラミネート外装体を作製した。ラミネート外装体に上記電極積層体を挿入した。電解液を注液して真空含浸させた後、減圧下にて開口部を熱融着により封止することによって、積層型リチウムイオン電池を得た。この積層型リチウムイオン電池について初期充放電を行った後、高温エージングを行い、電池容量5Ahの積層型リチウムイオン電池を得た。
電池の残容量(以下、「SOC」と称する。)0%から100%まで、雰囲気温度55℃で、初期充放電を行った。充放電の条件は、以下の通りである:0.1C電流で4.1Vまで定電流充電(CC充電)、その後4.1Vで定電圧充電(CV充電)し、次いで0.1C電流での定電流放電(CC放電)を、2.5Vまで行う。
リチウムイオン二次電池の初期充放電を行った後、電池を解体し、高周波誘導結合プラズマ発光分光分析法(ICP発光分光分析法)により、セパレータの硫黄含有量を測定した。
作成した電池に対して次の条件でサイクル試験を行った。作製した電池のSOC0%と100%までの間で、1C電流、4.15Vでの定電流定電圧充電(CCCV充電)と、1C電流での定電流放電(CC放電)を、55℃環境下で300回繰り返した。これによる容量維持率を、(300回サイクル後の電池容量)/(初期電池容量)なる計算式で計算した。
11 負極集電体
12 正極集電体
13 負極活物質層
15 正極活物質層
17 セパレータ
25 負極リード
27 正極リード
29 外装体
31 電解液
Claims (5)
- 正極活物質層が正極集電体に配置された正極と、
負極活物質層が負極集電体に配置された負極と、
セパレータと、
電解液と、
を含む発電要素を、外装体内部に含むリチウムイオン二次電池であって、
該セパレータが、セパレータの重量に対して0.02〜0.11重量%の硫黄を含有する、前記リチウムイオン二次電池。 - 該セパレータが、オレフィン系樹脂層と耐熱性微粒子層とを有する、請求項1に記載のリチウムイオン二次電池。
- 該硫黄が該耐熱性微粒子層中に含有されている、請求項1または2に記載のリチウムイオン二次電池。
- 該耐熱性微粒子がアルミナまたはベーマイトである、請求項1または2に記載のリチウムイオン二次電池。
- 正極活物質層が一般式LixNiyCozMn(1−y−z)O2で表される層状結晶構造を有するリチウムニッケルコバルトマンガン複合酸化物を含む、請求項1〜4のいずれか1項に記載のリチウムイオン二次電池。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015131990A JP6403277B2 (ja) | 2015-06-30 | 2015-06-30 | リチウムイオン二次電池の製造方法 |
| US15/171,058 US10153471B2 (en) | 2015-06-30 | 2016-06-02 | Lithium ion secondary battery |
| CN201610390359.3A CN106328871B (zh) | 2015-06-30 | 2016-06-03 | 锂离子二次电池 |
| EP16173066.8A EP3113247B1 (en) | 2015-06-30 | 2016-06-06 | Lithium ion secondary battery |
| KR1020160073621A KR20170003392A (ko) | 2015-06-30 | 2016-06-14 | 리튬 이온 2차 전지 |
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| JP2017016877A true JP2017016877A (ja) | 2017-01-19 |
| JP2017016877A5 JP2017016877A5 (ja) | 2017-10-12 |
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| WO2024142352A1 (ja) * | 2022-12-28 | 2024-07-04 | 京セラ株式会社 | 二次電池の製造方法 |
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| EP3584861B1 (en) * | 2017-09-15 | 2023-06-07 | LG Energy Solution, Ltd. | Negative electrode for lithium secondary battery, and lithium secondary battery including same |
| KR102468695B1 (ko) * | 2017-11-30 | 2022-11-21 | 주식회사 엘지에너지솔루션 | 전지셀의 활성화 방법 및 활성화 장치 |
| KR102270120B1 (ko) * | 2017-12-01 | 2021-06-28 | 주식회사 엘지에너지솔루션 | 전극 및 전극조립체 |
| US11322799B2 (en) | 2017-12-01 | 2022-05-03 | Lg Energy Solution, Ltd. | Electrode including single-sided electrode with inorganic coating layer attached to slurry on collector and electrode assembly including the same |
| EP3912924A4 (en) * | 2019-01-17 | 2022-03-02 | Toppan Printing Co., Ltd. | PACKAGING, GAS BARRIER LAMINATE AND PACKAGING BODY |
| CN110190327B (zh) * | 2019-05-30 | 2020-05-19 | 湖南电将军新能源有限公司 | 一种锂离子电池及其制备方法 |
| KR20230118887A (ko) | 2020-12-03 | 2023-08-14 | 센츄리 쎄라퓨틱스 인코포레이티드 | 유전자 조작 세포 및 이의 용도 |
| US11661459B2 (en) | 2020-12-03 | 2023-05-30 | Century Therapeutics, Inc. | Artificial cell death polypeptide for chimeric antigen receptor and uses thereof |
| AR124414A1 (es) | 2020-12-18 | 2023-03-22 | Century Therapeutics Inc | Sistema de receptor de antígeno quimérico con especificidad de receptor adaptable |
| JP7655203B2 (ja) * | 2021-11-22 | 2025-04-02 | トヨタ自動車株式会社 | 電池 |
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- 2016-06-06 EP EP16173066.8A patent/EP3113247B1/en active Active
- 2016-06-14 KR KR1020160073621A patent/KR20170003392A/ko not_active Withdrawn
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| WO2024142352A1 (ja) * | 2022-12-28 | 2024-07-04 | 京セラ株式会社 | 二次電池の製造方法 |
| JPWO2024142352A1 (ja) * | 2022-12-28 | 2024-07-04 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106328871A (zh) | 2017-01-11 |
| US20170005308A1 (en) | 2017-01-05 |
| CN106328871B (zh) | 2019-10-29 |
| EP3113247B1 (en) | 2018-11-21 |
| JP6403277B2 (ja) | 2018-10-10 |
| US10153471B2 (en) | 2018-12-11 |
| KR20170003392A (ko) | 2017-01-09 |
| EP3113247A1 (en) | 2017-01-04 |
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