JP2020532058A - リチウム二次電池用負極活物質の製造方法、およびそれを含むリチウム二次電池 - Google Patents
リチウム二次電池用負極活物質の製造方法、およびそれを含むリチウム二次電池 Download PDFInfo
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Abstract
Description
炭素原料として、石炭系プレミアム針状コークス製品であるグリーンコークス(VM含有量約5.0重量%)を使用した。グリーンコークスを、air classifying millを用いてD50が7μmになるように1次粉砕して、1次粒子を製造した。粉砕粒子は、気流分級装置が取り付けられたpulverizer型の粉砕装備を用いて追加的な磨砕を行い、得られた1次粒子のD50は7.5μmであった。
実施例1で揮発分を除去する熱処理段階を省略したことを除いては実施例1と同様の方法で負極活物質を製造した。
実施例1で磨砕工程を省略することを除いては実施例1と同様の方法で負極活物質を製造した。図4では、実施例3での製造工程のうち1次粒子のSEM写真を示した。
実施例1で1次粒子とピッチの重量比率を100:20としたことを除いては、実施例1と同様の方法で負極活物質を製造した。
実施例1で1次粒子の粉砕および磨砕後のD50を10μmとしたことを除いては、実施例1と同様の方法で負極活物質を製造した。
実施例1で1次粒子の粉砕および磨砕後のD50を5.5μmとしたことを除いては、実施例1と同様の方法で負極活物質を製造した。
実施例1で1次粒子の粉砕および磨砕後の昇温速度を20℃/分に調節したことを除いては、実施例1と同様の方法で負極活物質を製造した。
原料コークスとして、実施例1で使用したグリーンコークスではないか焼コークス(calcined coke)を使用(VM含有量約0.25重量%)し、1次粒子を炭化する段階を省略したことを除いては、実施例1と同様の方法で負極活物質を製造した。図5に粉砕および磨砕した1次粒子の走査型電子顕微鏡(SEM)写真を示した。図2、図4および図5に示すように、実施例1および実施例3での1次粒子が、比較例1の1次粒子に比べて、破砕された粒子面が鋭くなく比較的ゆるやかな楕円形と類似の1次粒子の形状を有していることを確認することができる。実施例3のように粉砕のみ実行した1次粒子に比べて、粉砕および磨砕を経た実施例1の1次粒子の粗度がより減少したことを確認することができる。
比較例1でか焼コークスとピッチの重量比率を100:20としたことを除いては、比較例1と同様の方法で負極活物質を製造した。
比較例1で1次粒子の粉砕および磨砕後のD50を10μmとしたことを除いては、比較例1と同様の方法で負極活物質を製造した。
実施例1〜実施例7および比較例1〜比較例3で製造した負極活物質の比表面積(BET)およびD50粒径を測定して下記表1に整理した。比表面積は窒素吸着法によって測定した。
実施例1〜実施例7および比較例1〜比較例3で製造した負極活物質、バインダー(Carboxy Methyl Celluloseおよびstyrene Butadiene Rubber)、導電材(Super P)の重量比率が97:2:1(記載順は、負極活物質:バインダー:導電材)になるように、蒸溜水を溶媒として使用して均一に混合した。
実験例2に記載した方法で電池を製造した。
実験例2に記載した方法で電池を製造した。
Claims (18)
- 揮発分を4〜10重量%含む炭素原料を粉砕して1次粒子を製造する段階;
前記1次粒子をバインダーと混合して2次粒子を製造する段階;および
前記2次粒子を黒鉛化して黒鉛材を製造する段階
を含む、リチウム二次電池用負極活物質の製造方法。 - 前記炭素原料は、グリーンコークスまたは生コークスを含む、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記1次粒子のD50粒径は、10μm以下である、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記1次粒子の球形化度は、0.75〜1である、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記1次粒子を製造する段階以後、前記1次粒子を磨砕する段階をさらに含む、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記1次粒子を製造する段階以後、前記1次粒子を1〜10℃/分の速度で昇温する段階をさらに含む、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記1次粒子を製造する段階以後、前記1次粒子を熱処理して前記1次粒子内の揮発分を除去する段階をさらに含む、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記1次粒子内の揮発分を除去する段階で、熱処理温度は800〜1500℃である、請求項7に記載のリチウム二次電池用負極活物質の製造方法。
- 前記2次粒子を製造する段階で、前記1次粒子100重量部に対して前記バインダーを2〜20重量部混合する、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記バインダーは、石炭系ピッチまたは石油系ピッチを含む、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記バインダーは、軟化点が80〜300℃である、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記2次粒子を製造する段階は、110〜500℃の温度でせん断力を活用して1〜5時間のあいだ行う、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記2次粒子のD50粒径は、14〜25μmである、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記2次粒子を製造する段階以後に、前記2次粒子を炭化する段階をさらに含む、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記炭化する段階は、800〜1500℃の温度で行う、請求項14に記載のリチウム二次電池用負極活物質の製造方法。
- 前記黒鉛材を製造する段階は、2800〜3200℃の温度で行う、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 前記黒鉛材は、比表面積が1.7m2/g以下であり、タップ密度が0.7g/cc以上である、請求項1に記載のリチウム二次電池用負極活物質の製造方法。
- 正極;負極;および電解質;を含み、
前記負極は、請求項1ないし17のいずれか一項による方法で製造されたリチウム二次電池用負極活物質を含む、
リチウム二次電池。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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KR10-2017-0104302 | 2017-08-17 | ||
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PCT/KR2018/008762 WO2019035580A1 (ko) | 2017-08-17 | 2018-08-01 | 리튬 이차 전지용 음극 활물질의 제조 방법, 및 이를 포함하는 리튬 이차 전지 |
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KR102486245B1 (ko) * | 2018-08-13 | 2023-01-10 | 주식회사 엘지에너지솔루션 | 리튬 이차전지용 음극 및 이를 포함하는 리튬 이차전지 |
US20210273223A1 (en) * | 2019-02-01 | 2021-09-02 | Lg Chem, Ltd. | Negative electrode for lithium secondary battery and lithium secondary battery comprising the same |
KR20210057604A (ko) * | 2019-11-12 | 2021-05-21 | 주식회사 엘지에너지솔루션 | 전리튬화된 음극, 및 이를 포함하는 이차전지 |
KR20210079730A (ko) * | 2019-12-20 | 2021-06-30 | 재단법인 포항산업과학연구원 | 리튬 이차전지용 음극 활물질, 이의 제조방법, 및 이를 포함하는 리튬 이차전지 |
CN111370695B (zh) * | 2020-03-20 | 2021-05-18 | 宁德新能源科技有限公司 | 负极活性材料及使用其的电化学装置和电子装置 |
KR20210132927A (ko) * | 2020-04-28 | 2021-11-05 | 재단법인 포항산업과학연구원 | 리튬 이차전지용 음극재, 이의 제조방법 및 리튬 이차전지 |
HUE061901T2 (hu) * | 2020-04-30 | 2023-08-28 | Contemporary Amperex Technology Co Ltd | Másodlagos akkumulátor és elõállítási eljárása, valamint másodlagos akkumulátort magában foglaló berendezés |
KR102163786B1 (ko) | 2020-05-12 | 2020-10-08 | 에스아이에스 주식회사 | 인조흑연 생산 자동화 시스템 |
KR20220057715A (ko) * | 2020-10-30 | 2022-05-09 | 주식회사 엘지에너지솔루션 | 리튬 이차전지용 음극 활물질, 음극 및 리튬 이차전지 |
KR20230038049A (ko) * | 2021-09-10 | 2023-03-17 | 주식회사 엘지에너지솔루션 | 음극 활물질의 제조방법, 음극 및 이차전지 |
KR20230088557A (ko) * | 2021-12-10 | 2023-06-20 | (주)포스코퓨처엠 | 리튬이차 전지용 급속충전형 음극활물질, 이를 포함하는 리튬이차 전지의 제조방법 |
CN114388808B (zh) * | 2022-01-13 | 2024-04-16 | 江西安驰新能源科技有限公司 | 一种长循环锂离子电池 |
CN114937758B (zh) * | 2022-03-22 | 2024-04-05 | 珠海冠宇电池股份有限公司 | 一种负极活性材料及含有该负极活性材料的负极片和电池 |
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- 2018-08-01 CN CN201880053281.3A patent/CN111225888A/zh active Pending
- 2018-08-01 WO PCT/KR2018/008762 patent/WO2019035580A1/ko unknown
- 2018-08-01 EP EP18846532.2A patent/EP3670475A4/en not_active Withdrawn
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EP3670475A1 (en) | 2020-06-24 |
KR20190019430A (ko) | 2019-02-27 |
WO2019035580A1 (ko) | 2019-02-21 |
US20210143425A1 (en) | 2021-05-13 |
EP3670475A4 (en) | 2020-08-26 |
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