JP7263627B2 - 負極活性材料及びその製造方法、二次電池及び二次電池を含む装置 - Google Patents
負極活性材料及びその製造方法、二次電池及び二次電池を含む装置 Download PDFInfo
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- JP7263627B2 JP7263627B2 JP2022534656A JP2022534656A JP7263627B2 JP 7263627 B2 JP7263627 B2 JP 7263627B2 JP 2022534656 A JP2022534656 A JP 2022534656A JP 2022534656 A JP2022534656 A JP 2022534656A JP 7263627 B2 JP7263627 B2 JP 7263627B2
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- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000011366 tin-based material Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Description
前記負極活性材料の表面積平均粒径D(3、2)をAと記し、前記負極活性材料が20kNのプレス力で粉圧された後の表面積平均粒径D(3、2)をBと記し、前記負極活性材料は72%≦B/A×100%≦82%を満たす、負極活性材料。
(a)コークス原料を提供し、前記コークス原料の体積平均粒径Dv50が7μm~12μmであり、前記コークス原料の揮発分含有量C1が1%≦C1≦12%を満たす工程と、
(b)前記コークス原料を整形して分級処理を行い、粒径分布(Dv90-Dv10)/Dv50が1.0~1.55である前駆体を得る工程と、
(c)前記前駆体を造粒させ、前記造粒過程で添加された接着剤の使用量C2が0%≦C2≦16%を満たし、且つ前記C1と前記C2が10%≦C1+C2≦16%を満たし、好ましくは、12%≦C1+C2≦14%である工程と、
(d)造粒生成物に対して黒鉛化処理を行い、人造黒鉛を得る工程と、
(e)有機炭素源を用いて前記人造黒鉛を被覆し、熱処理することにより、前記人造黒鉛の少なくとも一部の表面に非晶質炭素被覆層を形成し、負極活性材料を得て、前記被覆過程で添加された有機炭素源の使用量C3と前記C1と前記C2との間が13%≦C1+C2+C3≦18%、且つ1.5%≦C3×残炭率≦3.5%を満たす工程と、を含み、
ここで、前記負極活性材料の表面積平均粒径D(3、2)をAと記し、前記負極活性材料が20kNのプレス力で粉圧された後の表面積平均粒径D(3、2)をBと記し、前記負極活性材料が72%≦B/A×100%≦82%を満たす、負極活性材料の製造方法を提供する。
負極活性材料
二次電池
[負極シート]
[正極シート]
[電解質]
[セパレータ]
装置
実施例
実施例1
負極活性材料の作製
(1)原料の破砕
(2)整形及び分級
(3)造粒
(4)黒鉛化
(5)被覆
負極シートの作製
正極シートの作製
電解液の作製
セパレータ
二次電池の作製
実施例2~18及び比較例1~2
測定内容
(1)電池のサイクル性能の測定
(2)電池の急速充電性能の測定
Claims (14)
- 負極活性材料であって、核と前記核の少なくとも一部の表面を被覆する被覆層とを含み、
前記核は人造黒鉛を含み、前記被覆層は非晶質炭素を含み、
前記負極活性材料の表面積平均粒径D(3、2)をAと記し、Aの単位はμmであり、前記負極活性材料が20kNのプレス力で粉圧された後の表面積平均粒径D(3、2)をBと記し、Bの単位はμmであり、前記負極活性材料は72%≦B/A×100%≦82%を満たす、負極活性材料。 - 前記負極活性材料は74%≦B/A×100%≦80%を満たす、請求項1に記載の負極活性材料。
- 前記Aは、9μm≦A≦15μmである、請求項1又は2に記載の負極活性材料。
- 前記負極活性材料の体積平均粒径Dv50は10μm≦Dv50≦16μmを満たす、請求項1~3のいずれか一項に記載の負極活性材料。
- 前記負極活性材料の粒径分布(Dv90-Dv10)/Dv50は1.0≦(Dv90-Dv10)/Dv50≦1.35を満たす、請求項1~4のいずれか一項に記載の負極活性材料。
- 前記負極活性材料の体積粒径分布Dv90は18μm≦Dv90≦26μmを満たす、請求項1~5のいずれか一項に記載の負極活性材料。
- 前記負極活性材料のタップ密度は0.9g/cm3~1.15g/cm3である、請求項1~6のいずれか一項に記載の負極活性材料。
- 前記負極活性材料の黒鉛化度は90%~96%である、請求項1~7のいずれか一項に記載の負極活性材料。
- 前記負極活性材料の粉体のOI値は2.0~5.0である、請求項1~8のいずれか一項に記載の負極活性材料。
- 前記負極活性材料のグラム容量Cは350mAh/g≦C≦356mAh/gを満たす、請求項1~8のいずれか一項に記載の負極活性材料。
- 請求項1~10のいずれか一項に記載の負極活性材料を含む負極シート、を含む二次電池。
- 請求項11に記載の二次電池を含む装置。
- 負極活性材料の製造方法であって、
(a)コークス原料を提供し、前記コークス原料の体積平均粒径Dv50が7μm~12μmであり、前記コークス原料の揮発分含有量C1が1%≦C1≦12%を満たす工程と、
(b)前記コークス原料を整形して分級処理を行い、粒径分布(Dv90-Dv10)/Dv50が1.0~1.55である前駆体を得る工程と、
(c)前記前駆体を造粒させ、前記造粒過程で添加された接着剤の使用量C2が0%≦C2≦10%を満たし、且つ前記C1と前記C2が10%≦C1+C2≦16%を満たす工程と、
(d)造粒生成物を2800℃~3200℃の温度で黒鉛化処理を行い、人造黒鉛を得る工程と、
(e)有機炭素源を用いて前記人造黒鉛を被覆し、熱処理することにより、前記人造黒鉛の少なくとも一部の表面に非晶質炭素被覆層を形成し、負極活性材料を得て、前記被覆過程で添加された有機炭素源の使用量C3と前記C1と前記C2との間が13%≦C1+C2+C3≦18%、且つ1.5%≦C3×残炭率≦3.5%を満たす工程と、を含み、
前記負極活性材料の表面積平均粒径D(3、2)をAと記し、Aの単位はμmであり、前記負極活性材料が20kNのプレス力で粉圧された後の表面積平均粒径D(3、2)をBと記し、Bの単位はμmであり、前記負極活性材料が72%≦B/A×100%≦82%を満たす、負極活性材料の製造方法。 - 前記コークス原料は、さらに、
(1)前記コークス原料は石油系非針状コークス、石油系針状コークスのうちの一種又は複数種を含むこと、及び、
(2)前記コークス原料の粒径分布(Dv90-Dv10)/Dv50は1.2~1.7であること、
のうちの少なくとも一つを満たす、請求項13に記載の製造方法。
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WO2012127548A1 (ja) | 2011-03-18 | 2012-09-27 | パナソニック株式会社 | リチウムイオン二次電池用負極およびリチウムイオン二次電池 |
JP2017525083A (ja) | 2014-06-13 | 2017-08-31 | エルジー・ケム・リミテッド | 負極活物質及びその製造方法 |
JP2019179687A (ja) | 2018-03-30 | 2019-10-17 | 三菱ケミカル株式会社 | 人造黒鉛系負極材、非水系二次電池用負極及び非水系二次電池 |
CN109585803A (zh) | 2018-10-16 | 2019-04-05 | 湖南宸宇富基新能源科技有限公司 | 一种具有梯度结构的人造石墨负极材料及其制备和应用 |
CN111048749A (zh) | 2019-10-30 | 2020-04-21 | 深圳市卓能新能源股份有限公司 | 一种负极极片、锂离子电池及其制造方法 |
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US20220166009A1 (en) | 2022-05-26 |
WO2021217620A1 (zh) | 2021-11-04 |
CN114223072B (zh) | 2024-07-12 |
EP3955348A4 (en) | 2022-07-27 |
EP3955348B1 (en) | 2023-04-19 |
US11569498B2 (en) | 2023-01-31 |
JP2022554030A (ja) | 2022-12-27 |
KR20220092566A (ko) | 2022-07-01 |
CN114223072A (zh) | 2022-03-22 |
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