JP2017527071A - 二次電池の正極材及びその製造方法 - Google Patents
二次電池の正極材及びその製造方法 Download PDFInfo
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- JP2017527071A JP2017527071A JP2016575922A JP2016575922A JP2017527071A JP 2017527071 A JP2017527071 A JP 2017527071A JP 2016575922 A JP2016575922 A JP 2016575922A JP 2016575922 A JP2016575922 A JP 2016575922A JP 2017527071 A JP2017527071 A JP 2017527071A
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- positive electrode
- active material
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Description
[Mn1−xMx]3O4 (1)
前記式で、
0≦x≦0.5であり、
MはNi、Co、Fe、Cr、V、Cu、Zn、Ti、Al、Mg、及びBからなる群より選択される1種以上である。
Fe1−xMx(PO4−b)Xb (2)
前記式で、
0≦x≦0.5であり、
0≦b≦0.1であり、
MはMn、Ni、Co、Fe、Cr、V、Cu、Zn、Ti、Al、Mg、及びBからなる群より選択される1種以上であり、
XはF、S、及びNからなる群より選択される1種以上である。
M(OH1−x)2 (3)
前記式で、
MはMn、Ni、Co、Al、及びMgからなる群より選択される1種以上であり、
0≦x≦1である。
MyP (4)
前記式で、
M=M’1−kAkであり、
ここで、M’はNi1−a−b(Ni1/2Mn1/2)aCobであって、0.65≦a+b≦0.85及び0.1≦b≦0.4であり、
Aはドーパントであり、
0≦k≦0.05であり、
0.95≦y≦1.05であり、
Pは−OH、及び−OOHからなる群より選択される1種である。
1−1.正極材の製造
(Ni6.0Mn2.0Co2.0)OOHとLiOHを50:50の重量比で混合し、空気雰囲気で800℃にて6時間の間焼成して、Li(Ni6.0Mn2.0Co2.0)O2の正極活物質を製造した。
製造された正極材をアルミニウム(Al)ホイル集電体の一面にコーティングし、乾燥及び圧延した後、一定の大きさでパンチング(pouching)して正極を製造した。
人造黒鉛:SBR系バインダ:増粘剤を98:1:1の重量比で混合して負極活物質スラリーを製造した後、通常の方法で銅(Cu)ホイル集電体にコーティングして負極を製造した。
エチレンカーボネート(EC):プロピレンカーボネート(PC):ジエチルカーボネート(DEC)=3:2:5(体積比)の組成を有する有機溶媒及び1.0MのLiPF6を添加して非水性電解液を製造した。
正極活物質Li(Ni6.0Mn2.0Co2.0)O293.8重量%、導電材としてsuper−p3.2重量%、バインダとしてポリビニリデンフルオライド3.0重量%のみを混合して正極材を製造したことを除いては、実施例1と同一の方法で二次電池を製造した。
(Ni6.0Mn2.0Co2.0)OOHを5.8重量%混合して正極材を製造したことを除いては、実施例1と同一の方法で二次電池を製造した。
1.容量実験
前記実施例及び比較例で製造された二次電池等に対して、過放電条件(1.0〜4.25V)で容量実験をした。
3rd〜50thCycles − 1.0〜4.25V cut off
容量維持率は、過放電を進めた3th放電容量を基準に50thの放電容量の維持率を計算した。
Claims (14)
- 活物質前駆体とリチウム化合物から製造された正極活物質、導電材、及びバインダ、を含む正極活物質混合物;及び
添加剤としての活物質前駆体;を含み、
前記添加剤である活物質前駆体と正極活物質の材料である活物質前駆体は、同一の物質であるものである正極材。 - 前記活物質前駆体は、マンガン複合酸化物系前駆体、リン酸鉄複合酸化物系前駆体、コバルト酸化物系前駆体、ニッケル−コバルト酸化物系前駆体、及びニッケル−コバルト−マンガン複合酸化物系前駆体からなる群より選択された1種または2種以上を含む請求項1に記載の正極材。
- 前記マンガン複合酸化物系前駆体は、下記式(1)の組成を有する請求項2に記載の正極材。
[Mn1−xMx]3O4 (1)
前記式で、
0≦x≦0.5であり、
Mは、Ni、Co、Fe、Cr、V、Cu、Zn、Ti、Al、Mg、及びBからなる群より選択される1種以上である。 - 前記リン酸鉄複合酸化物系前駆体は、下記式(2)の組成を有する請求項2に記載の正極材。
Fe1−xMx(PO4−b)Xb (2)
前記式で、
0≦x≦0.5であり、
0≦b≦0.1であり、
Mは、Mn、Ni、Co、Fe、Cr、V、Cu、Zn、Ti、Al、Mg、及びBからなる群より選択される1種以上であり、
Xは、F、S、及びNからなる群より選択される1種以上である。 - 前記コバルト酸化物系前駆体は、Co2O3、およびCo3O4からなる群より選択される1種または2種を含む請求項2に記載の正極材。
- 前記ニッケル−コバルト酸化物系前駆体は、下記式(3)の組成を有する請求項2に記載の正極材。
M(OH1−x)2 (3)
前記式で、
Mは、Mn、Ni、Co、Fe、Cr、V、Cu、Zn、Ti、Al、Mg、及びBからなる群より選択される1種以上であり、
0≦x≦1である。 - 前記ニッケル−コバルト−マンガン複合酸化物系前駆体は、下記式(4)の組成を有する請求項2に記載の正極材。
MyP (4)
前記式で、
M=M’1−kAkであり、
ここで、M’はNi1−a−b(Ni1/2Mn1/2)aCobであって、0.65≦a+b≦0.85及び0.1≦b≦0.4であり、
Aは、ドーパントであり、
0≦k≦0.05であり、
0.95≦y≦1.05であり、
Pは、−OH、−OOH、及び−CO3からなる群より選択される1種である。 - 前記リチウム化合物は、炭酸リチウム(Li2CO3)、水酸化リチウム(LiOH)、硝酸リチウム(LiNO3)、及びリチウム水和物(LiOH・H2O)からなる群より選択された1種または2種以上である請求項1に記載の正極材。
- 前記正極活物質混合物は、正極活物質80.0〜99.0重量%、導電材0.1〜30.0重量%、及びバインダ0.1〜30.0重量%を含み、
前記正極材は、正極活物質混合物の総重量に対して、添加剤としての活物質前駆体を1.0〜5.0重量%で含む請求項1に記載の正極材。 - 前記正極活物質混合物は、正極活物質92.0〜97.0重量%、導電材1.0〜5.0重量%及びバインダ1.0〜5.0重量%を含み、
前記正極材は、正極活物質混合物の総重量に対して、添加剤としての活物質前駆体を2.0〜4.0重量%で含む請求項9に記載の正極材。 - (a)活物質前駆体及びリチウム化合物から正極活物質を製造する段階;及び
(b)前記製造された正極活物質、導電材、バインダ及び添加剤としての活物質前駆体を混合する段階;
を含む請求項1に記載の正極材の製造方法。 - 前記(b)段階で添加剤としての活物質前駆体は、正極活物質を添加する際に共に添加して混合する請求項11に記載の正極材の製造方法。
- 請求項1に記載の正極材を含む正極。
- 請求項13に記載の正極を含む二次電池。
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