JPWO2017047022A1 - 正極活物質、および、電池 - Google Patents
正極活物質、および、電池 Download PDFInfo
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Abstract
空間群FM3−Mに属する結晶構造を有し、下記の組成式(1)により表される化合物と、リチウムイオン導電体とを含む、正極活物質。
LixMeyOαFβ・・・式(1)
ここで、前記Meは、Mn、Co、Ni、Fe、Al、B、Ce、Si、Zr、Nb、Pr、Ti、W、Ge、Mo、Sn、Bi、Cu、Mg、Ca、Ba、Sr、Y、Zn、Ga、Er、La、Sm、Yb、V、Cr、からなる群より選択される一種または二種以上の元素であり、
かつ、下記の条件、
1.7≦x≦2.2、
0.8≦y≦1.3、
1≦α≦2.5、
0.5≦β≦2、
を満たす。
Description
LixMeyOαFβ・・・式(1)
0.8≦y≦1.3、1≦α≦2.5、0.5≦β≦2、を満たす。
実施の形態1における正極活物質は、空間群FM3−Mに属する結晶構造を有し、下記の組成式(1)により表される化合物と、リチウムイオン導電体とを含む、正極活物質。
LixMeyOαFβ・・・式(1)
かつ、下記の条件、
1.7≦x≦2.2、
0.8≦y≦1.3、
1≦α≦2.5、
0.5≦β≦2、
を満たす。
以下に、実施の形態1の正極活物質に含まれる上述の化合物の製造方法の一例が、説明される。
以下、実施の形態2が説明される。なお、上述の実施の形態1と重複する説明は、適宜、省略される。
[正極活物質の作製]
LiFとLi2OとMn2O3をLiF/Li2O/Mn2O3=1.0/0.5/0.5モル比でそれぞれ秤量した。
次に、70質量部の上述の化合物と、20質量部の導電剤と、10質量部のポリフッ化ビニリデン(PVDF)と、適量の2−メチルピロリドン(NMP)とを、混合した。これにより、正極合剤スラリーを得た。
上述の実施例から、LiBO2の添加量を、それぞれ変えた。
実施例1と同様にして、Li2MnO2Fを合成した。
上述の実施例5から、添加するリチウムイオン導電体を、それぞれ、変えた。
公知の手法を用いてコバルト酸リチウム(LiCoO2)を得た。
LiFとLi2OとMn2O3をLiF/Li2O/Mn2O3=1.0/0.5/0.5モル比でそれぞれ秤量した。
公知の手法を用いてコバルト酸リチウム(LiCoO2)を得た。
正極に対する電流密度を1.0mA/cm2に設定し、5.2Vの電圧に達するまで、実施例1の電池を充電した。
11 ケース
12 正極集電体
13 正極活物質層
14 セパレータ
15 封口板
16 負極集電体
17 負極活物質層
18 ガスケット
21 正極
22 負極
Claims (11)
- 空間群FM3−Mに属する結晶構造を有し、下記の組成式(1)により表される化合物と、リチウムイオン導電体とを含む、
正極活物質。
LixMeyOαFβ・・・式(1)
ここで、前記Meは、Mn、Co、Ni、Fe、Al、B、Ce、Si、Zr、Nb、Pr、Ti、W、Ge、Mo、Sn、Bi、Cu、Mg、Ca、Ba、Sr、Y、Zn、Ga、Er、La、Sm、Yb、V、Cr、からなる群より選択される一種または二種以上の元素であり、
かつ、下記の条件、
1.7≦x≦2.2、
0.8≦y≦1.3、
1≦α≦2.5、
0.5≦β≦2、
を満たす。 - 前記リチウムイオン導電体が含まれる量は、前記化合物の5質量%以下である、
請求項1に記載の正極活物質。 - 前記リチウムイオン導電体が含まれる量は、前記化合物の0.5質量%以上、かつ、1質量%以下、である、
請求項2に記載の正極活物質。 - 前記リチウムイオン導電体は、LiBO2、Li3PO4、LiNbO3、LiNbO2、から選択される少なくとも一種である、
請求項1から3のいずれかに記載の正極活物質。 - 前記リチウムイオン導電体は、前記化合物の少なくとも一部の表面を、被覆している、請求項1から4のいずれかに記載の正極活物質。
- 前記リチウムイオン導電体は、前記化合物の表面の少なくとも一部と、固溶体を形成している、
請求項1から5のいずれかに記載の正極活物質。 - 前記化合物を、主成分として、含む、
請求項1から6のいずれかに記載の正極活物質。 - x+y=α+β=3、を満たす、
請求項1から7のいずれかに記載の正極活物質。 - 前記化合物は、Li2MnO2F、または、Li2CoO2F、である、
請求項1から8のいずれかに記載の正極活物質。 - 請求項1から9のいずれかに記載の正極活物質を含む正極と、
負極と、
電解質と、
を備える、
電池。 - 前記負極は、リチウムを吸蔵および放出する特性を有する負極活物質を含み、
前記電解質は、非水電解液である、
請求項10に記載の電池。
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WO2017013848A1 (ja) * | 2015-07-23 | 2017-01-26 | パナソニックIpマネジメント株式会社 | 正極活物質、および、電池 |
CN110268560B (zh) | 2017-09-19 | 2022-04-26 | 株式会社Lg化学 | 二次电池用正极活性材料以及包含其的锂二次电池 |
JP7143864B2 (ja) * | 2020-02-14 | 2022-09-29 | 株式会社豊田中央研究所 | リチウム複合酸化物、蓄電デバイス及びリチウム複合酸化物の製造方法 |
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JP2015069754A (ja) * | 2013-09-27 | 2015-04-13 | トヨタ自動車株式会社 | 正極活物質及び正極活物質の製造方法並びにリチウム電池 |
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