JP6329972B2 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
- Publication number
- JP6329972B2 JP6329972B2 JP2015559791A JP2015559791A JP6329972B2 JP 6329972 B2 JP6329972 B2 JP 6329972B2 JP 2015559791 A JP2015559791 A JP 2015559791A JP 2015559791 A JP2015559791 A JP 2015559791A JP 6329972 B2 JP6329972 B2 JP 6329972B2
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- Japan
- Prior art keywords
- composite oxide
- positive electrode
- lithium composite
- active material
- lithium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000007774 positive electrode material Substances 0.000 claims description 28
- 229910052708 sodium Inorganic materials 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 11
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 description 32
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- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 14
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
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Description
正極は、例えば金属箔等の正極集電体と、正極集電体上に形成された正極活物質層とで構成される。正極集電体には、アルミニウムなどの正極の電位範囲で安定な金属の箔、当該金属を表層に配置したフィルム等を用いることができる。正極活物質層は、正極活物質の他に、導電材及び結着材を含むことが好適である。
負極は、例えば金属箔等の負極集電体と、負極集電体上に形成された負極活物質層とを備える。負極集電体には、アルミニウムや銅などの負極の電位範囲で安定な金属の箔、当該金属を表層に配置したフィルム等を用いることができる。負極活物質層は、リチウムイオンを吸蔵・放出可能な負極活物質の他に、結着剤を含むことが好適である。また、必要により導電材を含んでいてもよい。
非水電解質は、非水溶媒と、非水溶媒に溶解した電解質塩とを含む。非水電解質は、液体電解質(非水電解液)に限定されず、ゲル状ポリマー等を用いた固体電解質であってもよい。非水溶媒には、例えばエステル類、エーテル類、アセトニトリル等のニトリル類、ジメチルホルムアミド等のアミド類、及びこれらの2種以上の混合溶媒等を用いることができる。
セパレータには、イオン透過性及び絶縁性を有する多孔性シートが用いられる。多孔性シートの具体例としては、微多孔薄膜、織布、不織布等が挙げられる。セパレータの材質としては、ポリエチレン、ポリプロピレン等のオレフィン系樹脂、セルロースなどが好適である。セパレータは、セルロース繊維層及びオレフィン系樹脂等の熱可塑性樹脂繊維層を有する積層体であってもよい。
[リチウム複合酸化物A1(正極活物質)の作製]
炭酸ナトリウム(Na2CO3)、酸化コバルト(Co3O4)、酸化マンガン(Mn2O3)を、Na0.87Co0.92Mn0.08O2の化学量論比となるように混合した。その後、この混合物を900℃で10時間保持することによって、ナトリウム複合酸化物を得た。ナトリウム複合酸化物の比表面積は(0.09m2/g)であった。
以下の手順により、図2に示す試験セルB1を作製した。
対極2;リチウム金属
参照極3;リチウム金属
セパレータ4;ポリエチレン製セパレータ
非水電解質5;4−フルオロエチレンカーボネート(FEC)と、メチル3,3,3−トリフルオロプロピオネート(FMP)とを体積比が20:80となるように混合して非水溶媒を得た。当該非水溶媒に、電解質塩としてLiPF6を1.0mol/lの濃度になるように溶解させて非水電解質を作製した。
LiOHとLiClとをモル比が1:5となるように混合した以外は、実施例1と同様にして、表1に示す組成比のリチウム複合酸化物A2を作製した。また、リチウム複合酸化物A2を用いて、試験セルB2を作製した。
LiOHとLiClとをモル比が1:1となるように混合し、ナトリウム複合酸化物中のNa量に対してLi量を6倍等量とした以外は、実施例1と同様にして、表1に示す組成比のリチウム複合酸化物A3を作製した。また、リチウム複合酸化物A3を用いて、試験セルB3を作製した。
LiOHとLiClとをモル比が1:1となるように混合した以外は、実施例1と同様にして、表1に示す組成比のリチウム複合酸化物X1を作製した。また、リチウム複合酸化物X1を用いて、試験セルY1を作製した。
BET比表面積が0.12m2/gであるナトリウム複合酸化物を用いた以外は、比較例1と同様にして、表1に示す組成比のリチウム複合酸化物X2を作製した。また、リチウム複合酸化物X2を用いて、試験セルY2を作製した。
イオン交換の処理時間を24時間とした以外は、比較例1と同様にして、表1に示す組成比のリチウム複合酸化物X3を作製した。また、リチウム複合酸化物X3を用いて、試験セルY3を作製した。
窒素吸脱着によるBET比表面積測定装置(日機装製、商品名「ADSOTRAC DN400」)を用いて、BET法により、各実施例・各比較例で作製したリチウム複合酸化物のBET比表面積を測定した。評価結果は表1に示す。
各実施例・各比較例で作製した試験セルについて、下記条件(45℃)で充放電を行い、正極活物質の単位重量当たりの充電容量及び放電容量を求め、初期充放電効率を算出した。評価結果は表1に示す。
各試験セルは、0.2Itの定電流で正極電位が4.65V(vs.Li/Li+)又は4.5V(vs.Li/Li+)に達するまで充電した。その後、0.2Itの定電流で正極電位が3.0V(vs.Li/Li+)に達するまで放電を行った。
2 対極
3 参照極
4 セパレータ
5 非水電解質
6 外装体
7 電極タブ
Claims (3)
- 空間群P63mcに属しO2構造で規定される結晶構造を有し、少なくともCoを含有するリチウム複合酸化物を主成分とする正極活物質を含み、
前記リチウム複合酸化物のBET比表面積が0.6m2/g未満であり、
前記正極活物質を含む正極の充電終止電位が4.5V(vs.Li/Li+)よりも高いことを特徴とする非水電解質二次電池。 - 前記リチウム複合酸化物は、一般式LixNayCozM(1-z)O(2±γ){0.75<x<1.1、0<y<0.1、0.8<z<0.98、0≦γ<0.1、Mは少なくとも1種の金属元素(Li、Na、Coを除く)}で表される、請求項1に記載の非水電解質二次電池。
- 前記リチウム複合酸化物は、一般式LixNayCoz1Mnz2M(1-z1-z2)O(2±γ){0.75<x<1.1、0<y<0.1、0.8<z1≦0.98、0<z2≦0.2、0≦γ<0.1、Mは少なくとも1種の金属元素(Li、Na、Co、Mnを除く)}で表される、請求項1に記載の非水電解質二次電池。
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US20220216467A1 (en) * | 2019-04-26 | 2022-07-07 | Panasonic Intellectual Property Management Co., Ltd. | Secondary battery positive electrode active material, and secondary battery |
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