JPWO2016103657A1 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
- Publication number
- JPWO2016103657A1 JPWO2016103657A1 JP2016565909A JP2016565909A JPWO2016103657A1 JP WO2016103657 A1 JPWO2016103657 A1 JP WO2016103657A1 JP 2016565909 A JP2016565909 A JP 2016565909A JP 2016565909 A JP2016565909 A JP 2016565909A JP WO2016103657 A1 JPWO2016103657 A1 JP WO2016103657A1
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- Prior art keywords
- negative electrode
- active material
- positive electrode
- electrode active
- secondary battery
- Prior art date
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- 238000009713 electroplating Methods 0.000 description 1
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- 239000000835 fiber Substances 0.000 description 1
- ZTOMUSMDRMJOTH-UHFFFAOYSA-N glutaronitrile Chemical compound N#CCCCC#N ZTOMUSMDRMJOTH-UHFFFAOYSA-N 0.000 description 1
- 229910001849 group 12 element Inorganic materials 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- LLEVMYXEJUDBTA-UHFFFAOYSA-N heptanedinitrile Chemical compound N#CCCCCCC#N LLEVMYXEJUDBTA-UHFFFAOYSA-N 0.000 description 1
- SDAXRHHPNYTELL-UHFFFAOYSA-N heptanenitrile Chemical compound CCCCCCC#N SDAXRHHPNYTELL-UHFFFAOYSA-N 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
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- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- 229910052912 lithium silicate Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- RCIJMMSZBQEWKW-UHFFFAOYSA-N methyl propan-2-yl carbonate Chemical compound COC(=O)OC(C)C RCIJMMSZBQEWKW-UHFFFAOYSA-N 0.000 description 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
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- 125000001174 sulfone group Chemical group 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
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- 239000010937 tungsten Substances 0.000 description 1
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Abstract
Description
実施形態の説明で参照する図面は、模式的に記載されたものであり、図面に描画された構成要素の寸法比率などは、現物と異なる場合がある。具体的な寸法比率等は、以下の説明を参酌して判断されるべきである。
非水電解質二次電池10は、正極11と、負極12と、非水電解質とを備える。正極11と負極12との間には、セパレータ13を設けることが好適である。非水電解質二次電池10は、例えば正極11及び負極12がセパレータ13を介して巻回されてなる巻回型の電極体14と、非水電解質とが電池ケースに収容された構造を有する。なお、巻回型の電極体14の代わりに、正極及び負極がセパレータを介して交互に積層されてなる積層型の電極体など、他の形態の電極体が適用されてもよい。電極体14及び非水電解質を収容する電池ケースとしては、円筒形、角形、コイン形、ボタン形等の金属製ケース、樹脂シートをラミネートして形成された樹脂製ケース(ラミネート型電池)などが例示できる。図1に示す例では、有底円筒形状のケース本体15と封口体16とにより電池ケースが構成されている。
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合材層とで構成される。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。正極合材層は、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。正極は、例えば正極集電体上に正極活物質、結着材等を含む正極合材スラリーを塗布し、塗膜を乾燥させた後、圧延して正極合材層を集電体の両面に形成することにより作製できる。
負極は、例えば金属箔等からなる負極集電体と、当該集電体上に形成された負極合材層とで構成される。負極集電体には、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。負極合材層は、負極活物質の他に、結着材を含むことが好適である。負極は、例えば負極集電体上に負極活物質、結着材等を含む負極合材スラリーを塗布し、塗膜を乾燥させた後、圧延して負極合材層を集電体の両面に形成することにより作製できる。
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。また、ポリエチレン層及びポリプロピレン層を含む多層セパレータであってもよく、セパレータの表面にアラミド系樹脂等の樹脂が塗布されたものを用いてもよい。
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。非水溶媒は、上記のように、少なくともフッ素化鎖状カルボン酸エステルを含む。非水溶媒には、例えばフッ素化鎖状カルボン酸エステル以外のエステル類、エーテル類、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。また、プロパンスルトン等のスルホン基含有化合物を用いてもよい。非水溶媒は、これら溶媒の水素の少なくとも一部をフッ素等のハロゲン原子で置換したハロゲン置換体を含んでいてもよい。
[正極の作製]
正極活物質としてLiNi0.88Co0.09Al0.03O2で表されるリチウムニッケルコバルトアルミニウム複合酸化物を100重量部と、アセチレンブラック(AB)を1重量部と、ポリフッ化ビニリデン(PVdF)を1重量部とを混合し、さらにN−メチル−2−ピロリドン(NMP)を適量加えて、正極合材スラリーを調製した。次に、当該正極合材スラリーをアルミニウム箔からなる正極集電体の両面に塗布し、乾燥させた。これを所定の電極サイズに切り取り、ローラーを用いて圧延し、正極集電体の両面に正極合材層が形成された正極を作製した。なお、LiNi0.88Co0.09Al0.03O2の結晶構造は、層状岩塩構造(六方晶、空間群R3−m)である。
負極活物質として粒子表面が炭素被覆された酸化ケイ素(SiO)を4重量部、及び黒鉛粉末(C)を96重量部と、カルボキシメチルセルロース(CMC)を1重量部と、スチレン−ブタジエンゴム(SBR)を1重量部とを混合し、さらに水を適量加えて、負極合材スラリーを調製した。次に、当該負極合材スラリーを銅箔からなる負極集電体の両面に塗布し、乾燥させた。これを所定の電極サイズに切り取り、ローラーを用いて圧延し、負極集電体の両面に負極合材層が形成された負極を作製した。
4−フルオロエチレンカーボネート(FEC)と、3,3,3−トリフルオロプロピオン酸メチル(FMP)とを、15:85の体積比で混合した。当該混合溶媒に、LiPF6を1.2mol/Lの濃度となるように溶解させて非水電解質を作製した。なお、電解液100重量部に対して、ビニレンカーボネートを0.5重量部、及びプロペンスルトン1重量部を添加した。
上記正極にアルミニウムリードを、上記負極にニッケルリードをそれぞれ取り付け、セパレータを介して正極及び負極を渦巻き状に巻回することにより巻回型の電極体を作製した。セパレータには、ポリエチレン製の微多孔膜の片面にポリアミドとアルミナのフィラーを分散させた耐熱層を形成したものを用いた。当該電極体を、外径18.2mm、高さ65mmの有底円筒形状の電池ケース本体に収容し、上記非水電解液を注入した後、ガスケット及び封口体により電池ケース本体の開口部を封口して18650型の円筒形非水電解質二次電池X1を作製した。
FMPの代わりにEMCを用いて非水電解質を作製したこと以外は、実施例1と同様にして電池Y1を作製した。
負極活物質として酸化ケイ素を用いず黒鉛のみを用いたこと以外は、実施例1と同様にして電池Y2を作製した。
FMPの代わりにEMCを用いて非水電解質を作製したこと以外は、比較例2と同様にして電池Y3を作製した。
LiNi0.88Co0.09Al0.03O2の代わりにLiNi0.50Co0.20Mn0.30O2を用いて正極を作製したこと以外は、実施例1と同様にして電池Y4を作製した。
FMPの代わりにEMCを用いて非水電解質を作製したこと以外は、比較例4と同様にして電池Y5を作製した。
負極活物質として酸化ケイ素を用いず黒鉛のみを用いたこと以外は、比較例4と同様にして電池Y6を作製した。
FMPの代わりにEMCを用いて非水電解質を作製したこと以外は、比較例6と同様にして電池Y7を作製した。
上記各電池について、下記充放電サイクルを繰り返した後の抵抗値を測定して、入出力特性の評価とした。
0.3It(1000mA)で定格容量の100%まで充電させた〔即ち、充電深度(SOC)が100%となった〕後、25℃の条件の下で、開回路電圧から0.5It(1500mA)の電流値で20秒間放電を行った。放電開始20秒後の電圧と放電開始直前の電圧により、下記の式1を用いて25℃での抵抗値を算出した。なお、セルY1〜Y7の各セルの抵抗値は、セルX1の抵抗値を100%としたときの相対値で示した。
上記各電池について、下記充放電サイクルを繰り返した後の容量維持率を測定して、サイクル特性(耐久性)の評価とした。
25℃の温度環境下において、各電池を0.3It(1000mA)mAの定電流で電池電圧が4.2Vとなるまで充電し、電池電圧が4.2Vに達した後は定電圧で充電した。次に、0.3It(1000mA)mAの定電流で電池電圧が3.0Vとなるまで放電を行い、このときの放電容量(初期容量)を求めた。この充放電サイクルを繰り返し行い、100サイクル後の放電容量を初期容量で除した値に100をかけて、容量維持率を算出した。
Claims (5)
- 層状構造を有し、リチウム(Li)を除く金属元素の総量に対するコバルト(Co)の含有量が1mol%以上20mol%未満であるリチウム遷移金属酸化物を主成分とする正極活物質を含む正極と、
ケイ素(Si)を含有する負極活物質を含む負極と、
フッ素化鎖状カルボン酸エステルを含む非水電解質と、
を備えた、非水電解質二次電池。 - 前記リチウム遷移金属酸化物は、Liを除く金属元素の総量に対するニッケル(Ni)の含有量が80mol%以上である、請求項1に記載の非水電解質二次電池。
- 前記負極活物質は、SiOx(0.8≦x≦1.5)で表されるケイ素酸化物と、黒鉛との混合物からなり、
前記ケイ素酸化物の含有量は、前記負極活物質の総重量に対して1重量%〜20重量%であり、前記黒鉛の含有量は80重量%〜99重量%である、請求項1又は2に記載の非水電解質二次電池。 - 前記フッ素化鎖状カルボン酸エステルは、フッ素化プロピオン酸メチルである、請求項1〜3のいずれか1項に記載の非水電解質二次電池。
- 前記フッ素化鎖状カルボン酸エステルの含有量は、前記非水電解質を構成する非水溶媒の総体積に対して40体積%〜90体積%である、請求項1〜4のいずれか1項に記載の非水電解質二次電池。
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