JP7242120B2 - リチウム二次電池およびその製造方法 - Google Patents
リチウム二次電池およびその製造方法 Download PDFInfo
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- JP7242120B2 JP7242120B2 JP2021539358A JP2021539358A JP7242120B2 JP 7242120 B2 JP7242120 B2 JP 7242120B2 JP 2021539358 A JP2021539358 A JP 2021539358A JP 2021539358 A JP2021539358 A JP 2021539358A JP 7242120 B2 JP7242120 B2 JP 7242120B2
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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Description
以下、本発明を図面を参照して詳細に説明する。本明細書および請求の範囲に使用されている用語や単語は、通常的または辞典的な意味に限定して解釈してはならず、発明者は、自身の発明を最善の方法で説明するために、用語の概念を適宜定義することができるという原則に則って、本発明の技術的思想に合致する意味と概念に解釈すべきである。
正極の空隙率(%)={1-(正極の真密度/正極の電極密度)}×100
負極の空隙率(%)={1-(負極の真密度/負極の電極密度)}×100
また、本発明は、リチウム二次電池の製造方法を提供する。前記リチウム二次電池の製造方法は、前述したリチウム二次電池の製造方法である。
実施例1:リチウム二次電池の製造
アルミニウムパウチ型の電池ケースを準備した。前記電池ケース内には、一方の領域と他方の領域とを分離するプロピレン重合体セパレータ(厚さ15μm)を形成した。
正極活物質としてLiNi0.8Co0.1Mn0.1O2(平均粒径(D50)12μm)、正極集電体粒子として球状のアルミニウム粒子(平均粒径(D50)2μm)、導電材としてアセチレンブラックを93:2:5の重量比で混合したもの(粉末状)を第1の混合物として使用し、負極活物質として人造黒鉛(平均粒径(D50)18μm)、負極集電体粒子として銅粒子(平均粒径(D50)2μm)、導電材としてアセチレンブラックを93:2:5の重量比で混合したもの(粉末状)を第2の混合物として使用した以外は、実施例1と同様の方法でリチウム二次電池を製造した。
正極活物質としてLiNi0.8Co0.1Mn0.1O2(平均粒径(D50)12μm)、正極集電体粒子として球状のアルミニウム粒子(平均粒径(D50)2μm)、導電材としてアセチレンブラックを83:12:5の重量比で混合したもの(粉末状)を第1の混合物として使用し、負極活物質として人造黒鉛(平均粒径(D50)18μm)、負極集電体粒子として銅粒子(平均粒径(D50)2μm)、導電材としてアセチレンブラックを83:12:5の重量比で混合したものを第2の混合物として使用(粉末状)した以外は、実施例1と同様の方法でリチウム二次電池を製造した。
第1の混合物のうち、正極活物質として第1の正極活物質LiNi0.8Co0.1Mn0.1O2(平均粒径(D50)14μm)および第2の正極活物質LiNi0.8Co0.1Mn0.1O2(平均粒径(D50)4μm)を80:20の重量比で混合したものを使用した以外は、実施例1と同様の方法でリチウム二次電池を製造した。
正極活物質としてLiNi0.8Co0.1Mn0.1O2(平均粒径(D50)12μm)、導電材としてアセチレンブラック、バインダーとしてPVDFを、N-メチルピロリドン溶媒中に90:5:5の重量比で混合して正極スラリーを作製し、これをアルミニウム集電体(厚さ:15μm)の一方の面に塗布した後、130℃で乾燥した後、圧延して正極を製造した。前記正極の厚さは130μmであった。
実験例1:出力特性の評価
実施例1~4および比較例1で製造されたリチウム二次電池のそれぞれの出力特性を評価した。出力特性評価は、実施例および比較例のリチウム二次電池を充電(0.2C CC/CV充電4.2V 0.05C cut)させ、10分間休止(rest)させ、放電(0.2C CC放電2.5V cut)させた。
実施例1~4および比較例1で製造されたリチウム二次電池を初期充電(0.2C CC/CV充電4.2V/0.05C cut)し、初期放電(0.2C CC放電2.5V cut)させた後の放電容量を評価した。
11 セパレータ
12a 正極タブ
12b 負極タブ
20 正極
20a 第1の混合物
30 負極
30a 第2の混合物
Claims (14)
- セパレータによって内部の一方の領域と他方の領域とが区分されている電池ケースと、
前記電池ケースの内部の一方の領域に形成され、正極活物質および正極集電体粒子を含む正極と、
前記電池ケースの内部の他方の領域に形成され、負極活物質および負極集電体粒子を含む負極と、を含み、
前記正極の空隙率は、20%~30%である、リチウム二次電池。 - 前記負極の空隙率は、25%~35%である、請求項1に記載のリチウム二次電池。
- 前記正極は、前記正極集電体粒子を1重量%~15重量%で含み、
前記負極は、前記負極集電体粒子を1重量%~15重量%で含む、請求項1または2に記載のリチウム二次電池。 - 前記正極集電体粒子および前記負極集電体粒子の平均粒径(D50)は、互いに独立に、0.5μm~3μmである、請求項1から3のいずれか一項に記載のリチウム二次電池。
- 前記正極集電体粒子および前記負極集電体粒子は、互いに独立に、アルミニウム、銅、ステンレス鋼、ニッケルおよびチタンからなる群より選択された少なくとも1種を含む、請求項1から4のいずれか一項に記載のリチウム二次電池。
- 前記正極活物質は、第1の正極活物質及び第2の正極活物質を含み、
前記第1の正極活物質の平均粒径(D50)は、前記第2の正極活物質の平均粒径(D50)よりも大きい、請求項1から5のいずれか一項に記載のリチウム二次電池。 - 前記第1の正極活物質の平均粒径(D50)は、10μm~18μmであり、
前記第2の正極活物質の平均粒径(D50)は、2μm~8μmである、請求項6に記載のリチウム二次電池。 - セパレータによって、内部の一方の領域と他方の領域とが区分されている電池ケースを準備するステップと、
正極活物質および正極集電体粒子を含む第1の混合物を製造し、負極活物質および負極集電体粒子を含む第2の混合物を製造するステップと、
前記電池ケースの一方の領域に前記第1の混合物を注入し、前記電池ケースの他方の領域に前記第2の混合物を注入するステップと、
前記第1の混合物および前記第2の混合物が注入された電池ケースに圧力を加えて圧延する圧延ステップと、を含む、リチウム二次電池の製造方法。 - 前記第1の混合物および前記第2の混合物は、互いに独立に、スラリー状または粉末状で前記電池ケースに注入される、請求項8に記載のリチウム二次電池の製造方法。
- 前記第1の混合物および前記第2の混合物の注入時に、前記電池ケースを振動させる工程をさらに行う、請求項8または9に記載のリチウム二次電池の製造方法。
- 前記第1の混合物および前記第2の混合物が注入された前記電池ケースを乾燥する乾燥ステップをさらに含む、請求項8から10のいずれか一項に記載のリチウム二次電池の製造方法。
- 前記乾燥ステップは、前記圧延ステップの前に行われるか、前記圧延ステップと同時に行われる、請求項11に記載のリチウム二次電池の製造方法。
- 前記圧延ステップが行われた前記電池ケースの内部に電解液を注入するステップをさらに含む、請求項8から12のいずれか一項に記載のリチウム二次電池の製造方法。
- 前記電解液が注入された前記電池ケースの内部を真空化して、前記電池ケースを密封するステップをさらに含む、請求項13に記載のリチウム二次電池の製造方法。
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- 2020-01-16 CN CN202080008759.8A patent/CN113273014A/zh active Pending
- 2020-01-16 KR KR1020200006200A patent/KR102605649B1/ko active IP Right Grant
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- 2020-01-16 EP EP20740822.0A patent/EP3893314B1/en active Active
- 2020-01-16 JP JP2021539358A patent/JP7242120B2/ja active Active
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EP3893314B1 (en) | 2023-07-26 |
JP2022517927A (ja) | 2022-03-11 |
KR20200089239A (ko) | 2020-07-24 |
CN113273014A (zh) | 2021-08-17 |
WO2020149679A1 (ko) | 2020-07-23 |
KR102605649B1 (ko) | 2023-11-24 |
EP3893314A1 (en) | 2021-10-13 |
EP3893314A4 (en) | 2022-02-09 |
US20220102731A1 (en) | 2022-03-31 |
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