JP2019530180A - 電解液及び電池 - Google Patents
電解液及び電池 Download PDFInfo
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- JP2019530180A JP2019530180A JP2019516707A JP2019516707A JP2019530180A JP 2019530180 A JP2019530180 A JP 2019530180A JP 2019516707 A JP2019516707 A JP 2019516707A JP 2019516707 A JP2019516707 A JP 2019516707A JP 2019530180 A JP2019530180 A JP 2019530180A
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 23
- -1 nitrogen heterocyclic compounds Chemical class 0.000 claims abstract description 127
- 239000008151 electrolyte solution Substances 0.000 claims abstract description 47
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 37
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000654 additive Substances 0.000 claims abstract description 20
- 230000000996 additive effect Effects 0.000 claims abstract description 18
- 150000001875 compounds Chemical class 0.000 claims description 71
- 125000001424 substituent group Chemical group 0.000 claims description 51
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical group [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 50
- 229910001416 lithium ion Inorganic materials 0.000 claims description 50
- 229910052736 halogen Inorganic materials 0.000 claims description 39
- 150000002367 halogens Chemical class 0.000 claims description 36
- 229910052739 hydrogen Inorganic materials 0.000 claims description 29
- 239000001257 hydrogen Substances 0.000 claims description 28
- 125000000217 alkyl group Chemical group 0.000 claims description 25
- 125000003118 aryl group Chemical group 0.000 claims description 16
- 125000000623 heterocyclic group Chemical group 0.000 claims description 13
- 125000000304 alkynyl group Chemical group 0.000 claims description 12
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 10
- 125000004191 (C1-C6) alkoxy group Chemical group 0.000 claims description 9
- 229910001415 sodium ion Inorganic materials 0.000 claims description 9
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- 150000001491 aromatic compounds Chemical class 0.000 claims description 7
- 125000004169 (C1-C6) alkyl group Chemical group 0.000 claims description 6
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 6
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims description 6
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- 125000006711 (C2-C12) alkynyl group Chemical group 0.000 claims description 4
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 7
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- 238000001228 spectrum Methods 0.000 description 6
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- 125000006273 (C1-C3) alkyl group Chemical group 0.000 description 5
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- 238000012360 testing method Methods 0.000 description 4
- RIUWBIIVUYSTCN-UHFFFAOYSA-N trilithium borate Chemical compound [Li+].[Li+].[Li+].[O-]B([O-])[O-] RIUWBIIVUYSTCN-UHFFFAOYSA-N 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
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- FALRKNHUBBKYCC-UHFFFAOYSA-N 2-(chloromethyl)pyridine-3-carbonitrile Chemical compound ClCC1=NC=CC=C1C#N FALRKNHUBBKYCC-UHFFFAOYSA-N 0.000 description 3
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 125000001037 p-tolyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)C([H])([H])[H] 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 125000000538 pentafluorophenyl group Chemical group FC1=C(F)C(F)=C(*)C(F)=C1F 0.000 description 1
- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 125000002255 pentenyl group Chemical group C(=CCCC)* 0.000 description 1
- 125000005981 pentynyl group Chemical group 0.000 description 1
- 125000001792 phenanthrenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C=CC12)* 0.000 description 1
- DGTNSSLYPYDJGL-UHFFFAOYSA-N phenyl isocyanate Chemical compound O=C=NC1=CC=CC=C1 DGTNSSLYPYDJGL-UHFFFAOYSA-N 0.000 description 1
- 125000003884 phenylalkyl group Chemical group 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- IUGYQRQAERSCNH-UHFFFAOYSA-M pivalate Chemical class CC(C)(C)C([O-])=O IUGYQRQAERSCNH-UHFFFAOYSA-M 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000006410 propenylene group Chemical group 0.000 description 1
- WYVAMUWZEOHJOQ-UHFFFAOYSA-N propionic anhydride Chemical compound CCC(=O)OC(=O)CC WYVAMUWZEOHJOQ-UHFFFAOYSA-N 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- QMKUYPGVVVLYSR-UHFFFAOYSA-N propyl 2,2-dimethylpropanoate Chemical compound CCCOC(=O)C(C)(C)C QMKUYPGVVVLYSR-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 125000003373 pyrazinyl group Chemical group 0.000 description 1
- 125000002098 pyridazinyl group Chemical group 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- 125000002943 quinolinyl group Chemical group N1=C(C=CC2=CC=CC=C12)* 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002153 silicon-carbon composite material Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 150000005687 symmetric chain carbonates Chemical class 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 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
- 125000000335 thiazolyl group Chemical group 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000007704 transition Effects 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
Abstract
Description
前記基に置換基が存在する場合、該置換基はハロゲン、シアノ、C1〜C6アルキル基、C2〜C6アルケニル基、及び、C1〜C6アルコキシ基から選ばれる少なくとも一種であり、
x、y、zはそれぞれ独立に、0〜8の整数から選ばれるものであり、
m、n、kはそれぞれ独立に、0〜2の整数から選ばれるものである。〕
〔ポリシアノ基含有6員窒素ヘテロ環化合物〕
前記基に置換基が存在する場合、該置換基はハロゲン、シアノ、C1〜C6アルキル基、C2〜C6アルケニル基、及び、C1〜C6アルコキシ基から選ばれる少なくとも1種である。
x、y、zはそれぞれ独立に0〜8から選ばれる整数である。
m、n、kはそれぞれ独立に0〜2から選ばれる整数である。〕
式I−1で示される化合物の改良態様として、R1、R2、R3、およびR4はそれぞれ独立に、水素、ハロゲン、置換あるいは無置換のC1〜C6直鎖又は分岐鎖アルキル基、置換あるいは無置換のC5〜C9シクロアルキル基、置換あるいは無置換のC1〜C6アルコキシ基、置換あるいは無置換のC1〜C6アミン基、置換あるいは無置換のC2〜C6アルケニル基、置換あるいは無置換のC2〜C6アルキニル基、置換あるいは無置換のC6〜C12アリール基、及び、置換あるいは無置換のC4〜C12ヘテロ環基から選ばれるものであり、また、前記基に置換基が存在する場合、該置換基はハロゲンから選ばれるものである。
式I−2で示される化合物の改良態様として、R1、R2、R3、およびR4はそれぞれ独立に、水素、ハロゲン、置換あるいは無置換のC1〜C6直鎖又は分岐鎖アルキル基、置換あるいは無置換のC5〜C9シクロアルキル基、置換あるいは無置換のC1〜C6アルコキシ基、置換あるいは無置換のC1〜C6アミン基、置換あるいは無置換のC2〜C6アルケニル基、置換あるいは無置換のC2〜C6アルキニル基、置換あるいは無置換のC6〜C12アリール基、及び、置換あるいは無置換のC4〜C13ヘテロ環基から選ばれるものであり、前記基に置換基が存在する場合、該置換基はハロゲンから選ばれるものである。
式I−3で示される化合物の改良態様として、R1、R2、およびR3はそれぞれ独立に、水素、ハロゲン、置換あるいは無置換のC1〜C6直鎖又は分岐鎖アルキル基、置換あるいは無置換のC5〜C9シクロアルキル基、置換あるいは無置換のC1〜C6アルコキシ基、置換あるいは無置換のC1〜C6アミン基、置換あるいは無置換のC2〜C6アルケニル基、置換あるいは無置換のC2〜C6アルキニル基、置換あるいは無置換のC6〜C12アリール基、及び、置換あるいは無置換のC4〜C13ヘテロ環基から選ばれるものであり、前記基に置換基が存在する場合、該置換基はハロゲンから選ばれるものである。
〔添加剤A〕
不飽和結合を有する環状カーボネート化合物は、一種以上の式II−0で示される化合物である。
ハロゲンで置換された環状カーボネート化合物は、一種以上の式II−1で示される化合物である。
好ましくは、硫酸エステル化合物が環状硫酸エステル化合物である。前記環状硫酸エステル化合物は式II−2で示された化合物から選ばれる少なくとも一種である。
スルトン化合物は式II−3で示された化合物から選ばれる少なくとも一種である。
ジスルホン酸化合物は二つのスルホン酸基を含有する化合物である。好ましくは、ジスルホン酸化合物はメチレンジスルホネート化合物から選ばれるものである。具体的に、下記の式II−4で示された化合物から選ばれる少なくとも一種であってもよい。
好ましくは、亜硫酸エステル化合物は環状亜硫酸エステル化合物である。前記環状亜硫酸エステル化合物は具体的に式II−5で示された化合物から選ばれる少なくとも一種であってもよい。
ニトリル化合物はアセトニトリル、プロピオニトリル、スクシノニトリル、グルタロニトリル、アジポニトリル、ピメロニトリル、スベロニトリル、セバコニトリルから選ばれる一種又は二種以上のニトリルであってもよい。
芳香族化合物はシクロヘキシルベンゼン、フルオロシクロヘキシルベンゼン化合物(1−フルオロ−2−シクロヘキシルベンゼン、1−フルオロ−3−シクロヘキシルベンゼン、1−フルオロ−4−シクロヘキシルベンゼン)、tert−ブチルベンゼン、tert−アミルベンゼン、1−フルオロ−4−tert−ブチルベンゼン等の分岐アルキル基を有する芳香族化合物;ビフェニル、ターフェニル(オルト、メタ、パラ)、ジフェニルエーテル、フルオロベンゼン、ジフルオロベンゼン(オルト、メタ、パラ)、アニソール、2,4−ジフルオロアニソール、ターフェニルの部分水素化物(1,2−ジシクロヘキシルベンゼン、2−フェニルビシクロヘキシル、1,2−ジフェニルシクロヘキサン、2−シクロヘキシルビフェニル)などの芳香族化合物から選ばれてもよい。
イソシアネート化合物はメチルイソシアネート、エチルイソシアネート、ブチルイソシアネート、フェニルイソシアネート、テトラメチレンジイソシアネート、ヘキサメチレンジイソシアネート、オクタメチレンジイソシアネート、1,4−フェニレンジイソシアネート、アクリル酸2− イソシアナトエチル、メタクリル酸2−イソシアナトエチルから選ばれる一種又は二種以上のイソシアネート化合物であってもよい。
好ましくは、ホスファゼン化合物として、メトキシペンタフルオロシクロトリホスファゼン、エトキシペンタフルオロシクロトリホスファゼン、フェノキシペンタフルオロシクロトリホスファゼン、又はエトキシヘプタフルオロシクロテトラホスファゼンなどの環状ホスファゼン化合物が挙げられる。
酸無水物化合物として、無水酢酸、無水プロピオン酸などの鎖状カルボン酸無水物、又は無水コハク酸、無水マレイン酸、2−アリルコハク酸無水物、無水グルタル酸、無水イタコン酸、3−スルホ−プロピオン酸無水物などの環状酸無水物化合物が好適に挙げられる。
亜リン酸エステル化合物はシラン亜リン酸エステル化合物から選ばれてもよく、具体的に下記の式II−6で示された化合物から選ばれる少なくとも一種であってもよい。
リン酸エステル化合物はシランリン酸エステル化合物から選ばれてもよく、具体的に下記の式II−7で示された化合物から選ばれる少なくとも一種であってもよい。
ホウ酸エステル化合物はシランホウ酸エステル化合物から選ばれてもよく、具体的に下記の式II−8で示された化合物から選ばれる少なくとも一種であってもよい。
カルボン酸エステルは鎖状カルボン酸エステル及び環状カルボン酸エステルから選ばれてもよい。当該鎖状カルボン酸エステル及び環状カルボン酸エステルには不飽和結合又はハロゲン原子を含んでもよい。
炭素数1〜12のアルキル基について、該アルキル基は鎖状アルキル基であってもよく、シクロアルキル基であってもよい。前記シクロアルキル基の環に位置する水素はアルキル基で置換されてもよい。前記アルキル基における炭素数の下限は1、2、3、4または5であることが好ましく、その上限は3、4、5、6、8、10または12であることが好ましい。好ましくは、炭素数1〜10のアルキル基から選ばれ、より好ましくは、炭素数1〜6の鎖状アルキル基や炭素数3〜8のシクロアルキル基から選ばれ、さらに好ましくは、炭素数1〜4的鎖状アルキル基や炭素数5〜7的シクロアルキル基から選ばれる。前記アルキル基の例として、具体的に、メチル、エチル、n−プロピル、イソプロピル、n−ブチル、イソブチル、sec−ブチル、tert−ブチル、n−ペンチル、イソペンチル、ネオペンチル、ヘキシル、2−メチル−ペンチル、3−メチル−ペンチル、1,1,2−トリメチル−プロピル、3,3−ジメチル−ブチル、ヘプチル、2−ヘプチル、3−ヘプチル、2−メチルヘキシル、3−メチルヘキシル、イソヘプチル、オクチル、ノニル及びデシルが挙げられる。
〔有機溶剤〕
〔電解質塩〕
〔Li塩−1類〕
〔Li塩−2類〕
〔Li塩−3類〕
〔Li塩−4類〕
〔Li塩−5類〕
〔電解液の製造〕
〔ポリシアノ基含有6員窒素ヘテロ環化合物の合成〕
(一)一般式I−1の化合物の製造:
1、迅速に撹拌しながら20〜60分間にわたって原料P−1に濃度30〜40%のP−2水溶液を滴下し、滴下が完了した後で15〜30h迅速に撹拌し、70〜90℃のオイルバス中で3〜5h還流撹拌し、発煙性無色粘調状液体の中間生成物I−1−1を得た。
(二)一般式I−2の化合物の製造:
無水エタノールにおいて、無水炭酸ナトリウムと、原料P−4と、原料P−3とを混合し、2〜5h撹拌しながら反応させた。熱エタノールで洗浄することを複数回繰り返して粗生成物を得、再結晶して式I−2で示された化合物を得た。
(三)一般式のI−3化合物の製造:
無水エタノールにおいて、無水炭酸ナトリウムと、原料P−5と、原料P−3とを混合し、2〜5h撹拌しながら反応させた。熱エタノールで洗浄することを複数回繰り返して粗生成物を得、再結晶して式I−3で示された化合物を得た。
実施例
25℃で、リチウムイオン電池をまず1Cの定電流で電圧が4.35Vになるまで充電し、さらに4.35Vの定電圧で電流が0.05Cになるまでに充電した。次に1Cの定電流で電圧が3.0Vになるまで放電した。これを1つの充放電サイクルとし、今回の放電容量は初回サイクルの放電容量とする。リチウムイオン電池を上記方法によって200サイクル充放電テストを行い、第200サイクルの放電容量を検出した。
45℃で、リチウムイオン電池をまず1Cの定電流で電圧が4.35Vになるまで充電し、さらに4.35Vの定電圧で電流が0.05Cになるまでに充電した。次に1Cの定電流で電圧が3.0Vになるまで放電した。これを1つの充放電サイクルとし、今回の放電容量は初回サイクルの放電容量とする。リチウムイオン電池を上記方法によって200サイクル充放電テストを行い、第200サイクルの放電容量を検出した。
85℃で、リチウムイオン電池をまず0.5Cの定電流で電圧が4.35Vになるまで充電し、さらに4.35Vの定電圧で電流が0.05Cになるまでに充電した。この時のリチウムイオン電池の厚さを測定してh0と記す。その後、リチウムイオン電池を85℃の恒温箱に入れ、24h保存した後に取り出し、この時のリチウムイオン電池の厚さを測定してh1と記す。
Claims (12)
- 式I−1、式I−2又は式I−3で示されるポリシアノ基含有6員窒素ヘテロ環化合物から選ばれる少なくとも一種である添加剤を含むことを特徴とする、電解液。
前記基に置換基が存在する場合、該置換基はハロゲン、シアノ、C1〜C6アルキル基、C2〜C6アルケニル基、C1〜C6アルコキシ基から選ばれる少なくとも一種であり、
x、y、zはそれぞれ独立に、0〜8の整数から選ばれ、
m、n、kはそれぞれ独立に、0〜2の整数から選ばれる。〕 - R1、R2、R3及びR4はそれぞれ独立に、水素、ハロゲン、置換あるいは無置換のC1〜C3直鎖或いは分岐鎖アルキル基、置換あるいは無置換のC5〜C7シクロアルキル基、置換あるいは無置換のC1〜C3アルコキシ基、置換あるいは無置換のC1〜C3アミン基、置換あるいは無置換のC2〜C3アルケニル基、置換あるいは無置換のC2〜C3アルキニル基、置換あるいは無置換のC6〜C8アリール基、及び、置換あるいは無置換のC4〜C7ヘテロ環基から選ばれるものであり、
前記基に置換基が存在する場合、該置換基は、ハロゲンから選ばれることを特徴とする、請求項1に記載の電解液。 - m、n、kはそれぞれ独立に、1又は2から選ばれることを特徴とする、請求項1又は2に記載の電解液。
- 式I−1において、R1及びR3は同一の基であり、好ましくは、R1、R3及びR4は同一の基であり、
式I−2において、R1、R2、R3及びR4のうち、少なくとも二つが同一の基であり、好ましくは、R1、R2、R3及びR4のうち、少なくとも三つが同一の基であり、
式I−3において、R1、R2及びR3のうち、少なくとも二つが同一の基であることを特徴とする、請求項1又は2に記載の電解液。 - 式I−1において、R1及びR3は水素であり、好ましくは、R1、R3及びR4はいずれも水素であり、
式I−2において、R1、R2、R3及びR4のうち、少なくとも二つが水素であり、好ましくは、R1、R2、R3及びR4のうち、少なくとも三つが水素であり、
式I−3において、R1、R2及びR3のうち、少なくとも二つが水素であることを特徴とする、請求項4に記載の電解液。 - 前記電解液における前記ポリシアノ基含有6員窒素ヘテロ環化合物の質量百分率は0.001%〜10%であり、好ましくは0.1%〜3.5%であることを特徴とする、請求項1に記載の電解液。
- 前記式I−1で示されるポリシアノ基含有6員窒素ヘテロ環化合物は下記化合物から選ばれる少なくとも一種であり、
- 不飽和結合を有する環状カーボネート化合物、ハロゲン化環状カーボネート化合物、硫酸エステル化合物、亜硫酸エステル化合物、スルトン化合物、ジスルホン酸化合物、ニトリル化合物、芳香族化合物、イソシアネート化合物、ホスファゼン化合物、酸無水物化合物、亜リン酸エステル化合物、リン酸エステル化合物、ホウ酸エステル化合物、カルボン酸エステルから選ばれる少なくとも一種である添加剤Aをさらに含むことを特徴とする、請求項1に記載の電解液。
- 前記電解液における前記添加剤Aの質量百分率は0.01%〜30%であることを特徴とする、請求項8に記載の電解液。
- 正極シートと、負極シートと、前記正極シートと前記負極シートとの間に配置されたセパレータと、電解液とを含む電池であって、
前記電解液は、請求項1〜9のいずれか1項に記載の電解液であることを特徴とする、電池。 - 前記電池はリチウムイオン電池、ナトリウムイオン電池又はマグネシウムイオン電池であることを特徴とする、請求項10に記載の電池。
- 前記電池がリチウムイオン電池である場合、前記電池の充電カットオフ電圧が4.2V以上であることを特徴とする、請求項10に記載の電池。
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