JP7343583B2 - 電解液、並びに、電解液を含む電気化学装置及び電子装置 - Google Patents
電解液、並びに、電解液を含む電気化学装置及び電子装置 Download PDFInfo
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- JP7343583B2 JP7343583B2 JP2021531033A JP2021531033A JP7343583B2 JP 7343583 B2 JP7343583 B2 JP 7343583B2 JP 2021531033 A JP2021531033 A JP 2021531033A JP 2021531033 A JP2021531033 A JP 2021531033A JP 7343583 B2 JP7343583 B2 JP 7343583B2
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Description
ここで、m、kは、それぞれ独立して、0及び1からなる群から選択され、nは1~6の整数からなる群から選択され、
R11、R13、R14、R15、R16、R17、R18、R19、R1a、R1b、R1c及びR1dは、それぞれ独立して、H、置換又は無置換のC1-C10アルキレン基、置換又は無置換のC2-C10アルケニレン基、置換又は無置換のC2-C10アルキニレン基、置換又は無置換のC3-C10アレニル(Allenyl)基、置換又は無置換のC6-C10アリール基、置換又は無置換のC3-C10脂環式炭化水素基からなる群から選択され、
R12は、置換又は無置換のC1-C10アルキル基、置換又は無置換のC2-C10アルケニル基、置換又は無置換のC2-C10アルキニル基、置換又は無置換のC3-C10アレニル基、置換又は無置換のC6-C10アリール基、置換又は無置換のC3-C10脂環式炭化水素基、及び、置換又は無置換のヘテロ原子含有官能基からなる群から選択され、
ここで、置換される場合、置換基はそれぞれ独立してハロゲンからなる群から選択される、電解液を提供する。
(1、式Iで示される化合物)
本発明は、式Iで示される化合物の少なくとも一種を含み、
ここで、m、kは、それぞれ独立して0及び1からなる群から選択され、nは1~6の整数からなる群から選択され、
R11、R13、R14、R15、R16、R17、R18、R19、R1a、R1b、R1c及びR1dは、それぞれ独立して、H、置換又は無置換のC1-C10アルキレン基、置換又は無置換のC2-C10アルケニレン基、置換又は無置換のC2-C10アルキニレン基、置換又は無置換のC3-C10アレニル基、置換又は無置換のC6-C10アリール基、及び、置換又は無置換のC3-C10脂環式炭化水素基からなる群から選択され、
R12は、置換又は無置換のC1-C10アルキル基、置換又は無置換のC2-C10アルケニル基、置換又は無置換のC2-C10アルキニル基、置換又は無置換のC3-C10アレニル基、置換又は無置換のC6-C10アリール基、置換又は無置換のC3-C10脂環式炭化水素基、及び、置換又は無置換のヘテロ原子含有官能基からなる群から選択され、
ここで、置換される場合、置換基はそれぞれ独立してハロゲンからなる群から選択される、電解液を提供する。
一部の実施例において、電解液は、さらに、硫黄-酸素二重結合を含有する化合物、P-O結合を含有する化合物、ポリニトリル化合物又は環状カーボネート系化合物の少なくとも一種を含む。
本発明の電解液は、さらに、硫黄-酸素二重結合を含有する化合物を含んでもよく、この硫黄-酸素二重結合を含有する化合物は、式II-Aで示される化合物の少なくとも一種を含んでもよく、
R21及びR22は、それぞれ独立して、置換又は無置換のC1-C5アルキル基、置換又は無置換のC1-C5アルキレン基、置換又は無置換のC2-C10アルケニル基、置換又は無置換のC2-C10アルキニル基、置換又は無置換のC3-C10脂環基、置換又は無置換のC6-C10アリール基、置換又は無置換のC1-C6ヘテロシクリル基(ヘテロシクリル基は脂肪族ヘテロシクリル基及び芳香族ヘテロシクリル基を含む)、ここで、置換される場合、置換基は、ハロゲン原子及びヘテロ原子含有官能基の一種又は複数種であり、ここで、R21及びR22は閉環構造を形成してもよく、ヘテロ原子は、B、N、O、F、Si、P及びSからなる群から選択される一種又は複数種である。
一部の実施例において、本発明の電解液は、さらにP-O結合を含有する化合物を含み、前記P-O結合を含有する化合物は、ジフルオロリン酸リチウム、ジフルオロビス(オキサラト)リン酸リチウム、テトラフルオロオキサラトリン酸リチウム、1,2-ビス((ジフルオロホスフィノ)オキシ)エタン、リン酸トリメチル、リン酸トリフェニル、リン酸トリイソプロピル、リン酸3,3,3-トリフルオロエチル、亜リン酸3,3,3-トリフルオロエチル、リン酸トリス(トリメチルシリル)、エトキシ(ペンタフルオロ)シクロトリホスファゼン、及びペンタフルオロ(フェノキシ)シクロトリホスファゼンの少なくとも一種を含む。
一部の実施例において、本発明の電解液は、さらにポリニトリル化合物を含み、前記ポリニトリル化合物は、ジニトリル及びトリニトリル化合物の少なくとも一種を含む。一部の実施例において、ポリニトリル化合物は、アジポニトリル、スクシノニトリル、1,2-ビス(2-シアノエトキシ)エタン、1,2,3-プロパントリカルボニトリル、1,3,5-ペンタントリカルボニトリル、1,3,6-ヘキサントリカルボニトリル、1,2,6-ヘキサントリカルボニトリル、及び1,2,3-トリス(2-シアノエトキシ)プロパンの少なくとも一種を含むが、これらに限定されない。
一部の実施例において、電解液は、さらに、環状カーボネート添加剤を含んでもよく、前記環状カーボネート添加剤は、式IIIで示される化合物の少なくとも一種を含み、
一部の実施例において、本発明の電解液は、さらに、ホウ素含有リチウム塩を含み、前記ホウ素含有リチウム塩は、テトラフルオロホウ酸リチウム(LiBF4)、ビス(オキサラト)ホウ酸リチウム(LiB(C2O4)2、LiBOB)及びジフルオロ(オキサラト)ホウ酸リチウム(LiBF2(C2O4)、LiDFOB)の少なくとも一種を含む。
本発明の電解液は、さらに、非水有機溶媒を含んでもよい。
本発明の電解液は、さらに、リチウム塩を含んでもよく、前記リチウム塩は、有機リチウム塩及び無機リチウム塩の少なくとも一種を含むか、或いは、これらからなる群から選択される少なくとも一種である。一部の実施例において、リチウム塩には、フッ素元素、ホウ素元素及びリン元素の少なくとも一種を含む。
本発明は、さらに、正極、負極、セパレータ及び本発明の電解液を含む電気化学装置を提供する。
本発明に係る電気化学装置の正極は、集電体及び集電体上に設置する正極活物質層を含む。正極活物質層は正極活物質を含み、正極活物質は可逆的にリチウムイオンを吸蔵及び放出する化合物(即ち、リチウム化層間化合物)を含む。正極活物質は、リチウムと、コバルト、マンガン及びニッケルからなる群から選択される少なくとも一種とを含む複合酸化物を含む。
一部の実施例において、電気化学装置の負極は、集電体及び集電体上に形成される負極活物質層を含む。負極活物質層は、負極活物質を含み、負極活物質は、可逆的にリチウムイオンを吸蔵・放出する材料、リチウム金属、リチウム金属合金、リチウムをドープ・脱ドープ可能な材料、又は遷移金属酸化物を含んでもよい。可逆的にリチウムイオンを吸蔵・放出する材料は、炭素材料であってもよい。炭素材料は、充電式電気化学装置で一般的に使用される炭素による任意の負極活物質であってもよい。炭素材料の例は、結晶性炭素、非晶質炭素又はそれらの組み合わせを含む。結晶性炭素は、アモルファス、フレーク形、小フレーク形、球状又は繊維状の天然黒鉛又は人造黒鉛であってもよい。非晶質炭素は、ソフトカーボン、ハードカーボン、メソフェーズピッチ炭化物、焼成コークスなどであってもよい。低結晶性炭素と高結晶性炭素の両方は、炭素材料として使用してもよい。低結晶性炭素材料として、一般的に、ソフトカーボン及びハードカーボンを含む。高結晶性炭素材料として、一般的に、天然黒鉛、結晶性黒鉛、熱分解炭素、中間相ピッチ系炭素繊維、中間相カーボンビーズ、中間相ピッチ、及び高温か焼炭(例えば、石油又はコールタールピッチ由来のコークス)を含む。
一部の実施例において、電気化学装置のセパレータは、ポリオレフィン系多孔質フィルム、コート層(ポリオレフィン系多孔質フィルムの表面に塗工される)及びポリマー粘着剤を含む。
本発明は、さらに、本発明に係る電気化学装置を含む電子装置を提供する。
以下では、実施例を参照して、本発明をさらに説明する。これらの実施例は、本発明を説明するために使用され、本発明の範囲を制限するものではないことを理解すべきである。
(1、化合物I-13の合成)
500mLの三つ口フラスコに、トリス(2-シアノエチル)ホスフィン(38.64g、0.2mol)とn-ブタノール150mLを投入し、加熱還流して、完全に溶解させた後、撹拌しながら、1,2-ジブロモエタン16.9g(0.09mol)をゆっくりと加えた。混合物を合計24h加熱還流し、次に、即座にろ過し、沈殿物を収集し、乾燥し、そしてアセトニトリルで再結晶して、エチレンビス[トリス(2-シアノエチル)ホスホニウムブロミド]47.3gを得た。
100mLの丸底フラスコに、ジ(β-シアノエチル)ホスフィン2.8g、ピリジン1.9g、及びクロロホルム40mLを加えた。0℃で、ジ(β-シアノエチル)ホスフィンクロライド3.5gを加え、2h反応した後、水で2回抽出し、毎回水20mLで抽出し、乾燥し、クロロホルムを除去し、アセトン-水で再結晶して、3,3’,3’’,3’’’-(ジホスフィン-1,1,2,2-テトラキス)テトラプロピオニトリル(I-21)2.7gを得た。
(1、調製方法)
1)電解液の調製
基礎電解液一:含水量が10ppm未満のアルゴン雰囲気グローブボックス内で、エチレンカーボネート(ECと略記)、プロピレンカーボネート(PCと略記)、ジエチルカーボネート(DECと略記)、プロピオン酸エチル(EPと略記)、プロパン酸プロピル(PPと略記)を1:1:1:1:1の質量比で均一に混合し、完全に乾燥したリチウム塩であるLiPF6(1mol/L)を上記混合物に溶解して、基礎電解液一を得た。
正極一:NCM811(LiNi0.8Mn0.1Co0.1O2)、導電剤であるアセチレンブラック、バインダーであるポリフッ化ビニリデン(PVDFと略記)を96:2:2の重量比で適切な量のN-メチルピロリドン(NMPと略記)溶媒に完全に攪拌し、混合して、均一な正極スラリーを形成した。このスラリーを正極集電体であるアルミニウム箔に塗工し、乾燥し、コールドプレスし、タブを溶接して、正極一を得た。正極一の圧縮密度は3.50g/cm3であった。
負極一:黒鉛、バインダーであるスチレンブタジエンゴム(SBRと略記)、増粘剤であるカルボキシメチルセルロースナトリウム(CMCと略記)を97.4:1.4:1.2の重量比で適切な量の脱イオン水に完全に攪拌し、混合して、均一な負極スラリーを形成した。このスラリーを負極集電体である銅箔に塗工し、乾燥し、コールドプレスし、タブを溶接して、負極一を得た。負極一の圧縮密度は1.80g/cm3であり、黒鉛のDv50は10μmであった。
実施例では、単層のPE多孔質ポリマーフィルムをセパレータ(S)として使用し、この単層のPE多孔質ポリマーフィルムの厚さは5μmであり、孔隙率は39%であった。このセパレータには無機コート層と有機物が含まれ、無機コート層はAl2O3であり、有機物はポリフッ化ビニリデンであった。
セパレータが正極と負極との間に介在して隔離の役割を果たすように、正極、セパレータ、負極を順に積層して、次に、巻回してベアセルを得た。ベアセルを外装箔に置き、調製された電解液を乾燥された電池に注入し、真空パッケージ、静置、化成(formation)、整形などの工程を経って、リチウムイオン電池の調製を完了した。
実施例1~80と比較例1~5
実施例1~80と比較例1~5では、基礎電解液一、正極二及び負極一を使用して、前文で説明された方法に従って、リチウムイオン電池を調製して、且つ、リチウムイオン電池に対して、サイクル試験及び高温貯蔵試験を行った。具体的な測定方法は以下のとおりである。
サイクル容量維持率(%)=(C-C0)÷C0×100%
浮動充電の厚さ膨張率(%)=(D-D0)÷D0×100%
厚さ膨張率(%)=(D2-D1)÷D1×100%
実施例91~96と比較例6~7では、基礎電解液二、正極一及び負極一を使用して、前文で説明された方法に従って、リチウムイオン電池を調製して、且つ、リチウムイオン電池に対して、過充電試験を行った。具体的な測定方法は以下のとおりである。
実施例97~100及び比較例8では、基礎電解液三、正極二及び負極二を使用して、リチウムイオン電池を調製して、且つ、リチウムイオン電池に対して、60℃高温貯蔵試験を行った。具体的な測定方法は以下のとおりである。
60℃高温貯蔵の厚さ膨張率(%)=(D4-D3)÷D3×100%
45℃サイクル容量維持率(%)=(C2-C1)÷C1×100%
Claims (9)
- 電解液であって、前記電解液は、式Iで示される化合物の少なくとも一種を含み、
ここで、m、kは、それぞれ独立して、0及び1からなる群から選択され、nは2~6の整数からなる群から選択され、
R11、R13、R14、R15、R16、R17、R18、R19、R1a、R1b、R1c及びR1dは、それぞれ独立して、置換又は無置換のC1-C10アルキレン基、置換又は無置換のC2-C10アルケニレン基、置換又は無置換のC2-C10アルキニレン基、置換又は無置換のC3-C10アレニル基、置換又は無置換のC6-C10アリール基、及び、置換又は無置換のC3-C10脂環式炭化水素基からなる群から選択され、
R12は、置換又は無置換のC1-C10アルキル基、置換又は無置換のC2-C10アルケニル基、置換又は無置換のC2-C10アルキニル基、置換又は無置換のC3-C10アレニル基、置換又は無置換のC6-C10アリール基、置換又は無置換のC3-C10脂環式炭化水素基、及び、置換又は無置換のヘテロ原子含有官能基からなる群から選択され、
ここで、置換される場合、置換基はそれぞれ独立してハロゲンからなる群から選択され、
前記電解液は、さらに硫黄-酸素二重結合を含有する化合物を含み、前記硫黄-酸素二重結合を含有する化合物は、スルホラン、1,3-プロパンスルトン、1,4-ブタンスルトン、メチレンメタンジスルホネート、1,3-プロパンジスルホン酸無水物、硫酸エチレン、亜硫酸エチレン、4-メチル-1,3,2-ジオキサチオラン2,2-ジオキシド、2,4-ブタンスルトン、2-メチル-1,3-プロパンスルトン、1,3-ブタンスルトン、1-フルオロ-1,3-プロパンスルトン、2-フルオロ-1,3-プロパンスルトン、3-フルオロ-1,3-プロパンスルトン、プロペン1,3-スルトン、硫酸プロピレン、亜硫酸プロピレン、及びフルオロエチレンスルファートの少なくとも一種を含み、ここで、前記電解液の総重量に対して、前記硫黄-酸素二重結合を含有する化合物の含有量は0.01%~10%であり、
前記電解液は、さらにP-O結合を含有する化合物を含み、前記P-O結合を含有する化合物は、ジフルオロリン酸リチウム、ジフルオロビス(オキサラト)リン酸リチウム、テトラフルオロオキサラトリン酸リチウム、1,2-ビス((ジフルオロホスフィノ)オキシ)エタン、リン酸トリメチル、リン酸トリフェニル、リン酸トリイソプロピル、リン酸3,3,3-トリフルオロエチル、亜リン酸3,3,3-トリフルオロエチル、リン酸トリス(トリメチルシリル)、エトキシ(ペンタフルオロ)シクロトリホスファゼン、及びペンタフルオロ(フェノキシ)シクロトリホスファゼンの少なくとも一種を含み、ここで、前記電解液の総重量に対して、前記P-O結合を含有する化合物の含有量は0.1%~3%である、電解液。 - 前記電解液の総重量に対して、前記式Iで示される化合物の含有量は0.01%~5%である、請求項1に記載の電解液。
- さらにポリニトリル化合物を含み、前記ポリニトリル化合物は、アジポニトリル、スクシノニトリル、1,2-ビス(2-シアノエトキシ)エタン、1,2,3-プロパントリカルボニトリル、1,3,5-ペンタントリカルボニトリル、1,3,6-ヘキサントリカルボニトリル、1,2,6-ヘキサントリカルボニトリル、及び1,2,3-トリス(2-シアノエトキシ)プロパンの少なくとも一種を含む、請求項1に記載の電解液。
- 前記電解液の総重量に対して、前記式Iで示される化合物の含有量をa%とし、前記ポリニトリル化合物の含有量をb%としたときに、前記式Iで示される化合物の含有量と前記ポリニトリル化合物の含有量との比a/bは、0.1以上80以下である、請求項4に記載の電解液。
- 正極、負極、セパレータ及び請求項1~5のいずれか1項に記載の電解液を含む電気化学装置。
- 前記電解液は、さらに金属元素を含み、前記金属元素は、Cu、Co、Ni、及びMnの少なくとも一種を含み、前記電解液における前記金属元素の含有量は1000ppm未満である、請求項6に記載の電気化学装置。
- 前記負極は、負極活物質層及び負極集電体を含み、前記負極活物質層は負極活物質を含み、前記負極活物質はケイ素含有材料を含む、請求項6に記載の電気化学装置。
- 請求項6~8のいずれか1項に記載の電気化学装置を含む、電子装置。
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