JP7313534B2 - 抵抗が改善された二次電池の製造方法 - Google Patents
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Description
実施例1
正極活物質としてLiCoO293重量%、カーボンブラック(導電剤)2.5重量%、PVDF(バインダー)2.5重量%およびスクシノニトリル(SN)2重量%を含む正極合剤に、溶媒として非水系電解液を添加して正極スラリーを製造した。それを集電体の両面に塗布した後、乾燥および圧延して正極を製造した。
実施例3:実施例1での電極合剤内のSN含有量を4%とした場合。
実施例4:実施例1での電極合剤内のSN含有量を5%とした場合。
実施例5:実施例1での正極合剤にはSNを入れず、負極合剤のみにSNを2%含む。
実施例6:実施例5でのロールラミネーション圧力(線圧)を10kgf/cmに変更。
実施例7:実施例5でのロールラミネーション圧力(線圧)を30kgf/cmに変更。
比較例1:実施例1での電極合剤内のSN含有量を0.05%とした場合。
比較例2:実施例1での電極合剤内のSN含有量を7%とした場合。
比較例3:実施例5でのロールラミネーション圧力(線圧)を50kgf/cmに変更。
比較例4:実施例5での正極合剤にはSNを入れず、負極合剤のみにSNを0.05%含む。
電極接着力の測定:正極/分離膜/負極の電極組立体を製造した後、ラミネーション工程を経た後にラミネーションセル(電解液注液前の状態)を分解して、負極/分離膜の電極密着力を測定した。それを表2に示した。
上記実施例1~実施例7および比較例1~比較例4によって製造された二次電池について、充放電測定装置を使用して充放電特性の変化をテストした。得られた電池は、0.2C充電および0.2C放電で一回目のサイクル放電容量および効率を得ており、0.2C充電、2.0C放電を行って0.2C充電0.2C放電の結果と比較した容量を表2に示した。
10:スクシノニトリル
20:バインダーコーティング層
100:分離膜
200:第1電極、負極
210:集電体
220:負極スラリー層/合剤層
300:第2電極
Claims (10)
- スクシノニトリルを含む電極合剤と溶媒を含む電極スラリーを製造する段階(S1)と、
前記電極スラリーを集電体にコーティング及び乾燥して電極を製造する段階(S2)と、
前記電極および分離膜を交互に積層して、電極組立体を製造する段階(S3)と、
前記電極組立体を加熱および加圧するラミネーション段階(S4)と、
ラミネーションされた電極組立体を電池ケースに収容して電解液を注入する段階(S5)と、を含み、
前記電極組立体を加熱および加圧するラミネーション段階(S4)は、前記電極組立体をスクシノニトリルの融点以上の温度で加熱および加圧する段階であり、前記スクシノニトリルは、電極と分離膜との間でバインダーとして作用する、二次電池の製造方法。 - 前記スクシノニトリルの含有量は、電極合剤全体の重量を基準として0.1~5重量%である、請求項1に記載の二次電池の製造方法。
- 前記電極スラリーを製造する段階(S1)は、スクシノニトリルを電極スラリー内に均一に分散させる段階を含む、請求項1または2に記載の二次電池の製造方法。
- 前記電極を製造する段階(S2)は、
前記電極スラリーを集電体の一面または両面に塗布する段階、及び、
前記電極スラリーが塗布された集電体を乾燥する段階を含む、請求項1に記載の二次電池の製造方法。 - 前記電極スラリーが塗布された集電体を乾燥する段階で、前記集電体から遠い電極表面層のスクシノニトリル含有量が前記集電体に近い電極内部層のスクシノニトリルの含有量よりも大きくなるように前記電極スラリー内のスクシノニトリルの分布が再配置される、請求項4に記載の二次電池の製造方法。
- 前記スクシノニトリルは、前記電極の上層部または表面に位置する、請求項5に記載の二次電池の製造方法。
- 前記電極を製造する段階(S2)は、前記電極スラリーが塗布された集電体を常温で冷却させ、液状のスクシノニトリルを固相化する段階をさらに含む、請求項1から6のいずれか一項に記載の二次電池の製造方法。
- 前記電極組立体の加熱温度は、57℃以上である、請求項1から7のいずれか一項に記載の二次電池の製造方法。
- 前記電極組立体の加圧は30kgf/cm以下の線圧で行われる、請求項1から8のいずれか一項に記載の二次電池の製造方法。
- 前記ラミネーションされた電極組立体を電池ケースに収容して電解液を注入する段階(S5)で、電極内のスクシノニトリルが電解液上に溶出される、請求項1から9のいずれか一項に記載の二次電池の製造方法。
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KR1020200054039A KR20210135861A (ko) | 2020-05-06 | 2020-05-06 | 저항이 개선된 이차전지 제조방법 |
PCT/KR2020/019051 WO2021225248A1 (ko) | 2020-05-06 | 2020-12-24 | 저항이 개선된 이차전지 제조방법 |
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JP2016009572A (ja) | 2014-06-24 | 2016-01-18 | 三洋化成工業株式会社 | 電気化学デバイス用電極の製造方法 |
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KR100588288B1 (ko) | 2004-02-16 | 2006-06-09 | 주식회사 엘지화학 | 리튬 이차 전지용 전극 |
JP4954468B2 (ja) | 2004-12-10 | 2012-06-13 | 日立マクセルエナジー株式会社 | 捲回電極およびその製造方法、並びに電池の製造方法 |
FR3040550B1 (fr) | 2015-08-25 | 2017-08-11 | Commissariat Energie Atomique | Batterie au lithium-ion gelifiee |
US20170331092A1 (en) * | 2016-05-13 | 2017-11-16 | Quantumscape Corporation | Solid electrolyte separator bonding agent |
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- 2020-12-24 CN CN202080048316.1A patent/CN114127980B/zh active Active
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WO2021225248A1 (ko) | 2021-11-11 |
CN114127980B (zh) | 2023-11-24 |
CN114127980A (zh) | 2022-03-01 |
KR20210135861A (ko) | 2021-11-16 |
JP2022540233A (ja) | 2022-09-14 |
EP3985778B1 (en) | 2024-02-14 |
US20220263087A1 (en) | 2022-08-18 |
EP3985778A1 (en) | 2022-04-20 |
EP3985778A4 (en) | 2022-09-14 |
PL3985778T3 (pl) | 2024-05-06 |
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