JP6917888B2 - リチウム硫黄電池 - Google Patents
リチウム硫黄電池 Download PDFInfo
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Description
2Li+S8(固体)←→Li2S8(溶液)
2Li+Li2S8(溶液)←→2Li2S4(溶液)
2Li+Li2S4(溶液)←→2Li2S2(溶液)
2Li+Li2S2(溶液)←→2Li2S(固体沈殿物)
具体的に前記金属酸化物膜6は、コロイドシリカ、非晶質シリカ、表面処理されたシリカ、コロイドアルミナ、非晶質アルミナ、酸化スズ、酸化チタン、硫化チタン(TiS2)、酸化バナジウム、酸化ジルコニウム(ZrO2)、酸化鉄(Iron Oxide)、黄化鉄(FeS)、チタン酸鉄(FeTiO3)、チタン酸バリウム(BaTiO3)及びこれらの混合物からなる群から選ばれる金属酸化物を含むことができる。
前記電解質中に、前記リチウムポリスルファイドを溶解させない場合、放電時に正極から硫黄単体がポリスルファイドになり、電解質中に溶解されることで、正極活物質減少による電池容量減少の問題がある。しかし、前記リチウムポリスルファイドを前記電解質中に予め過飽和状態で溶解させれば、前記電解質中に溶解した前記リチウムポリスルファイド(Li2Sx)(1≦x≦8)が、S8 2−、S6 2−、S4 2−、S2 2−、S2−などのポリスルファイドイオン(Sx 2−)の形態で電解質中に均一に分散して存在する。その結果、電極から溶解されたポリスルファイドイオンの拡散が抑制され、活物質損失を低減させることができ、また、電極近方のポリスルファイドイオンが放電反応に関与することによって、充放電効率及びサイクル性能が向上される。また、固体−液体反応によりキネティック(kinetic)上昇効果があるので、固体界面(solid surface)対比高い反応活性度を示すことができる。
リチウム金属(bulk Li:150μm)を正極とし、リチウム薄膜−銅薄膜(Li foil(40μm)−Cu foil(20μm))を負極とするシンメトリック電池(symmetric cell)を製造し、電解質にリチウムポリスルファイドの含量を変更して添加剤として添加し、シンメトリック電池の利用効率増加を確認することによって、過飽和されたリチウムポリスルファイドの効果を間接的に測定した。
前記シンメトリック電池で、電解質として、トリエチレングリコールモノメチルエーテル(TEGDME)/ジオキソラン(DOL)/ジメチルエーテル(DME)(混合体積費=1/1/1)からなる有機溶媒に、1M濃度のリチウムビス(トリフルオロメタンスルホニル)イミド(LiTFSI)及び0.1M濃度のLiNO3を溶解させて製造した電解質を使用した。
前記参考例1の電解質で、0.05M濃度のLi2S6をさらに添加した。
前記参考例1の電解質で、0.5M濃度のLi2S6をさらに添加した。
X=[(qc−(q1−qr)/N)/qc] (1)
qc:進むLi含量(DOD10%:1.32mA)
q1:Cu薄膜上のLi含量(40μm:13.2mA)
qr:サイクル進行後、十分にストリッピングさせて測定されたLi含量(測定値)
N:15回
硫黄(平均粒径:5μm)をアセトニトリル中で、導電剤とバインダーをボールミルで混合して、正極活物質層形成用組成物を製造した。このとき、導電剤としてはカーボンブラックを、バインダーとしてはポリエチレンオキシド(分子量5,000,000g/mol)をそれぞれ使用した。混合割合は、重量比で硫黄:導電剤:バインダーが60:20:20になるようにした。製造された正極活物質層形成用組成物をアルミニウム集電体に塗布した後、乾燥して、正極を製造した(正極のエネルギー密度:1.0mAh/cm2)。
負極上に金属酸化物膜を形成しないことを除いては、前記実施例1と同様の方法でリチウム硫黄電池を製造した。
正極上にリチウムイオン伝導性高分子膜を形成しないことを除いては、前記実施例1と同様の方法でリチウム硫黄電池を製造した。
カーボン紙(厚さ:142μm、繊維直径:7〜7.5μm)にカーボンブラックをディップコーティングし、正極材を製造した(孔隙率82%)。前記正極材上に、ポリ(ペルフルオロスルホン酸)のリチウムイオン伝導性高分子膜(厚さ:0.5μm、イオン伝導率:1×10−4S/cm)を形成した。
硫黄(平均粒径:5μm)をアセトニトリル中で導電剤とバインダーをボールミルで混合し、正極活物質層形成用組成物を製造した。このとき、導電剤としてはカーボンブラックを、バインダーとしてはポリエチレンオキシド(分子量5,000,000g/mol)をそれぞれ使用した。混合割合は重量比で、硫黄:導電剤:バインダーが60:20:20になるようにした。製造された正極活物質層形成用組成物をアルミニウム集電体に塗布した後、乾燥して、正極を製造した(正極のエネルギー密度:1.0mAh/cm2)。
前記実施例4で製造された正極を走査型顕微鏡で観察した。その結果は、本発明の原出願である韓国特許出願第2015−0115013号(出願日:2015年8月14日)の図3に示した。
前記実施例1に係るリチウム硫黄電池の電解質のLi2S6濃度によるサイクル特性を測定し、図3及び図4に示した。これらから容量保持率を計算し、下記の表3(@50CYC.)に示した。
Li2Snのチェーン別電圧特性を調べるために、硫黄電極の影響の少ないカソライトシステム(catholyte system)で実験を行った。実験過程は、図5及び表4に示した。
2、20 負極
3、30 セパレータ
5、50 スルホン酸基を有するリチウムイオン伝導性高分子膜
6、60 金属酸化物膜
11 カーボン紙
12 導電剤
13 リチウムポリスルファイド溶液
100、200 リチウム硫黄電池
Claims (5)
- 互いに対向配置される正極と負極;
前記正極と負極との間に介在されるセパレータ;及び
電解質;を含み、
前記正極とセパレータとの間に位置し、スルホン酸基(−SO3H)を有するリチウムイオン伝導性高分子膜及び前記負極とセパレータとの間に位置する金属酸化物膜をさらに含み、
前記電解質が、過飽和されたリチウムポリスルファイド(lithium polysulfide)を含むものであり、
前記金属酸化物膜が、コロイドシリカからなる金属酸化物を含むものであり、
前記正極が、硫黄元素からなる正極活物質を含むものであり、
前記正極が炭素系導電剤でコーティングされたカーボン紙を含み、前記カーボン紙にリチウムポリスルファイドを含む電解質が含浸されたものであるかまたは、
前記正極がカーボン紙及び前記カーボン紙上に位置し、炭素系導電剤を含む導電剤層を含み、前記カーボン紙及び導電剤層が、リチウムポリスルファイドを含むものであるリチウム硫黄電池。 - 前記スルホン酸基を有するリチウムイオン伝導性高分子膜が、ポリ(ペルフルオロスルホン酸)、スルホン化テトラフルオロエチレンとフルオロビニルエーテルの共重合体、スルホン化ポリアリレンエーテル、スルホン化ポリアリレンエーテルエーテルケトン、スルホン化ポリアリレンエーテルエーテルスルホン、スルホン化ポリアゾール、スルホン化ポリビニルアルコール、スルホン化ポリフェニレンオキシド、スルホン化ポリフェニレンスルファイド、スルホン化ポリスルホン、スルホン化ポリカーボネート、スルホン化ポリスチレン、スルホン化ポリイミド、スルホン化ポリアミド、スルホン化ポリキノキサリン、スルホン化(リン酸化)ポリホスファゼン、スルホン化ポリベンズイミダゾール及びこれらの共重合体からなる群から選ばれる1種以上の高分子を含むものである請求項1に記載のリチウム硫黄電池。
- 前記スルホン酸基を有するリチウムイオン伝導性高分子膜が、1×10−4S/cm以上のリチウムイオン伝導率を有するものである請求項1に記載のリチウム硫黄電池。
- 前記スルホン酸基を有するリチウムイオン伝導性高分子膜が、0.1〜10μmの厚さを有するものである請求項1に記載のリチウム硫黄電池。
- 前記金属酸化物膜が、0.1〜10μmの厚さを有するものである請求項1に記載のリチウム硫黄電池。
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KR10-2014-0147907 | 2014-10-29 | ||
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KR1020150115013A KR101725650B1 (ko) | 2014-10-29 | 2015-08-14 | 리튬 황 전지 |
KR10-2015-0115013 | 2015-08-14 | ||
PCT/KR2015/010998 WO2016068534A1 (ko) | 2014-10-29 | 2015-10-19 | 리튬 황 전지 |
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KR101725650B1 (ko) | 2014-10-29 | 2017-04-12 | 주식회사 엘지화학 | 리튬 황 전지 |
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