JPWO2013018898A1 - リチウムイオン二次電池の負極材製造方法及びリチウムイオン二次電池用負極材 - Google Patents
リチウムイオン二次電池の負極材製造方法及びリチウムイオン二次電池用負極材 Download PDFInfo
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Abstract
Description
比較例1では、実施例1で用いた電解銅箔Aの粗化処理を省略した電解銅箔Eを用いた。そして、この電解銅箔Eの表面粗さ(Ra)が、下限値未満である陰極面に、負極活物質としてシリコン粉1〜シリコン粉3のそれぞれ用いて、実施例1と同様にして負極合剤層を形成し、比較用負極材5−I、比較用負極材5−II、および比較用負極材5−IIIを作製した。
比較例2は、実施例1で行った電解銅箔の作製方法と同一の方法において、未処理の電解銅箔の析出面側の粗化処理における微細銅粒子の付着形成の時間及び平滑めっき時間を変更し、表面粗さ(Ra)が上限値を超えた電解銅箔Fを得た。この電解銅箔Fの粗化処理された面の表面粗さ(Ra)は、0.60μmであった。そして、このときの微細銅粒子の平均粒径は、1.30μmであった。そして、この電解銅箔Fの粗化処理面側に、負極活物質としてシリコン粉1〜シリコン粉3のそれぞれ用いて、実施例1と同様にして負極合剤層を形成し、比較用負極材6−I、比較用負極材6−II、および比較用負極材6−IIIを作製した。
比較例3は、リチウムイオン二次電池用負極製造に用いる電解銅箔において、シランカップリング剤処理の有無の影響を検証するためのものであり、実施例1の防錆処理後のシランカップリング剤処理を省略した電解銅箔Gを作製した。このときの粗化処理面の表面粗さ(Ra)は0.21μm、微細銅粒子の平均粒径は、0.25μmであった。そして、この電解銅箔Gの粗化処理面側に、負極活物質としてシリコン粉1〜シリコン粉3のそれぞれ用いて、実施例1と同様にして負極合剤層を形成し、比較用負極材6−I、比較用負極材6−II、および比較用負極材6−IIIを作製した。
総合判定: リチウムイオン二次電池としての、「初回サイクル充放電効率(vs.Li)」、「50サイクル後の容量維持率(vs.LMO)」の測定結果を指標とし、リチウムイオン二次電池の性能の総合評価結果として、「◎」、「○」、「△」、「×」の四水準で判断した。このとき、実用上支障無く、且つ、良好なリチウムイオン二次電池用負極材となりうるのは「△〜◎」の範囲とした。
以下に、評価結果を表2に纏めて示すが、表2には、電解銅箔の表面粗さ(Ra)と活物質の平均粒径(D50(c))との関係を表す(Ra/D50(c))の値の順に、比較例1、実施例1〜実施例4、比較例2の順に並べて掲載している。
Claims (6)
- 負極集電体の表面に、負極活物質を含む負極合剤層を備えたリチウムイオン二次電池の負極材製造において、
リチウムと合金化する粒状材料及びリチウムを吸蔵・放出する炭素材料から選択される1種又は2種以上を負極活物質として用い、
当該負極集電体として、表面粗さ(Ra)が、0.20μm <Ra<0.50μmの範囲にあり、且つ、当該負極活物質の平均粒径(D50(c))の値を基準としたとき、当該表面粗さ(Ra)が、[0.053×D50(c)]μm〜[0.210×D50(c)]μmの範囲にある電解銅箔を選択的に用い、当該電解銅箔の表面にシランカップリング剤処理層を備え、その表面に当該負極活物質で負極合剤層を形成し、負極材とすることを特徴とするリチウムイオン二次電池の負極材製造方法。 - 前記電解銅箔は、負極活物質の平均粒径(D50(c))の値を基準として、その片面或いは両面に、平均粒径(D(p))が[0.06×D50(c)]μm〜[0.44×D50(c)]μmの範囲の微細金属粒子を付着させた粗化処理面を備えるものを用いる請求項1に記載のリチウムイオン二次電池の負極材製造方法。
- 前記電解銅箔は、銅、銅合金、ニッケル、ニッケル合金、コバルト及びコバルト合金のいずれかの成分からなる微細金属粒子を付着させた粗化処理面を備えるものを用いる請求項1又は請求項2に記載のリチウムイオン二次電池の負極材製造方法。
- 前記負極活物質は、平均粒径(D50(c))が、2.0μm〜4.0μmの範囲のものを用いる請求項1〜請求項3のいずれかに記載のリチウムイオン二次電池の負極材製造方法。
- 前記負極活物質は、リチウムと合金化する材料として、スズ又はケイ素を含むものを用いる請求項1〜請求項4のいずれかに記載のリチウムイオン二次電池の負極材製造方法。
- 請求項1〜請求項5のいずれかに記載のリチウムイオン二次電池の負極材製造方法を用いて得られたことを特徴とするリチウムイオン二次電池用負極材。
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KR101936339B1 (ko) | 2015-08-31 | 2019-04-03 | 주식회사 엘지화학 | 전극 합제층 형성 몰드를 포함하는 이차전지용 전극 제조 장치 |
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- 2012-08-03 JP JP2013526969A patent/JP6353655B2/ja active Active
- 2012-08-03 CN CN201280035535.1A patent/CN103688394B/zh active Active
- 2012-08-03 WO PCT/JP2012/069871 patent/WO2013018898A1/ja active Application Filing
- 2012-08-03 MY MYPI2014000299A patent/MY174328A/en unknown
- 2012-08-03 KR KR1020147002485A patent/KR101916984B1/ko active IP Right Grant
- 2012-08-03 TW TW101127976A patent/TWI596827B/zh active
- 2012-08-03 US US14/236,689 patent/US20140170489A1/en not_active Abandoned
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KR20140051278A (ko) | 2014-04-30 |
TW201312839A (zh) | 2013-03-16 |
CN103688394A (zh) | 2014-03-26 |
JP6353655B2 (ja) | 2018-07-04 |
MY174328A (en) | 2020-04-08 |
CN103688394B (zh) | 2016-08-17 |
KR101916984B1 (ko) | 2018-11-08 |
WO2013018898A1 (ja) | 2013-02-07 |
TWI596827B (zh) | 2017-08-21 |
US20140170489A1 (en) | 2014-06-19 |
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