Page 201 - 《精细化工》2023年第4期

す 40 ࢤす 4 ᱌ ㇫ ㏳ ࡃ ጒ Vol.40, No.4
20 23 Ꭱ 4 ᰵ FINE CHEMICALS Apr. 2023

ᰶᱧ⩢ࡃ႓̻ጒ͇
̶⅌⩟⸧䚥䩮⩢㼐⋟⌨ߍݯᄦ

倅ࢸ䨯⻨ၽ⩢↍⮱ᒞ৺

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ᅦ֟ⶂ喑ॡ᭫ᬻ 喑ॡ⻭ྤ喑ᑍᷓ܎喑ႌ䰗ᶲ
喍श仃๔႓ ࡃ႓ࡃጒ႓䮏喑⎃ࢄ श仃 416000喎

ᦅ㺮喟В̶⅌⩟⸧䚥䩮喍MFS喎҉ͧ倅⩢ࢸࣹߌ㘪⩢㼐⋟⌨ߍݯ喑⩕λ᣽倅 Li/LiNi 0.5 Mn 1.5 O 4 喍Li/LNMO喎⩢↍
⮱ᕔ㘪ȡ䛴⩕㏬ᕔម᣼мႶ∂喍LSV喎Ƞᓗ⣜мႶ∂喍CV喎Ƞٲᩫ⩢হϑ≮䭨ោ喍EIS喎䔈㵹⩢ࡃ႓ᕔ㘪≸䄂喑
䕇䓴 SEMȠXPSȠFTIR ᄦक़̺ह⩢㼐⋟⮱ Li/LNMO ⩢↍ᓗ⣜ݺऻ⮱⩢Ხ㶕䲏䔈㵹γ㶕ᒮȡ㐀᳉㶕ᬻ喑MFS ౕ
ٲᩫ⩢䓴⼸͚хٵλ⩢㼐⋟⏣ݯ⅔ࡃܳ㼐喑ౕ͑͗⩢Ხ̷ᒏ᜽⩢㼐⋟⩹䲏㛉喑ᄦ⩢Ხ᣽ӈԊ៑喑ើݣγ⩢㼐⋟
⮱ܳ㼐ȡౕ MFS ⌨ߍ䛼喍Вധ⵭⩢㼐⋟䉕䛼ͧധ۳喑̸ह喎ͧ 0.3%⮱⩢㼐⋟͚喑Li/LNMO ⩢↍ౕ 1 C Ժ⢴̸
ᓗ⣜ 300 ⁎ऻ喑ᩫ⩢℁ღ䛼ϻ݊໸ᬣ⮱ 135.12 mA·h/g 䭺㜠 123.86 mA·h/g喑ღ䛼Ԋᠮ⢴倅䓫 91.67%ȡ̻⩢㼐⋟
͚᱗⌨ߍ MFS ⮱⩢↍Ⱕ℁喑ڣᓗ⣜ऻ䭨ោᬻ᭫ۼᄼ喑㶕⣝ܧ䒰ສ⮱ᓗ⣜ᕔ㘪ȡ
ڠ䩛䃺喟̶⅌⩟⸧䚥䩮喠⩢㼐⋟⌨ߍݯ喠LiNi 0.5 Mn 1.5 O 4 喠䨯䉌Ხ喠⩢ࡃ႓ᕔ㘪
͚ఫܳㆨत喟TM912 ᪴⡛ᴴ䃳⴮喟A ᪴」㑃त喟1003-5214 (2023) 04-0887-07

Effect of magnesium trifluoromethanesulfonate as electrolyte
additive on high voltage lithium-ion battery

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YIN Caishuo, WU Xianming , WU Xiuting, ZHANG Mengfan, MENG Xuemei
喍College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan, China喎

Abstract: Magnesium trifluoromethanesulfonate (MFS) was used as bifunctional electrolyte additive to
improve the cycle performances of Li/LiNi 0.5Mn 1.5O 4(Li/LNMO) cells. The electrochemical performance
was evaluated by linear sweep voltammetry (LSV), cyclic voltammetry (CV), charge-discharge, and
electrochemical impedance spectroscopy (EIS). The electrode surface of Li/LNMO cells containing
different electrolytes before and after cycling were characterized by SEM, XPS, and FTIR. The results
indicated that MFS was preferably oxidized over solvents during the charge-discharge process, which led to
electrolyte interface films formed simultaneously on both electrodes, thus suppressing the decomposition of
electrolytes and providing protection for the electrodes. The discharge-specific capacity of Li/LNMO cell in
electrolyte containing 0.3% (based on the mass of base electrolyte, the same below) MFS decreased from
135.12 mA·h/g to 123.86 mA·h/g at 1 C rate after 300 cycles, and the capacity retention rate was as high as
91.67%. Compared with the cell in the electrolyte without MFS, the increase of charge transfer resistance
was restrained, and the electrochemical properties were improved significantly.
Key words: magnesium trifluoromethanesulfonate; electrolyte additives; LiNi 0.5Mn 1.5O 4; lithium anode;
electrochemical properties

䨯⻨ၽ⩢↍఍㘪䛼ჳᏓ倅Ƞᓗ⣜ᄬপ䪬Ƞ⣜ධ Ⅿ [1-2] ȡ♣㔹喑ڤᰶ䊲倅㘪䛼ჳᏓ⮱᫝ಸ⩢↍喍ຯ䨯
↎ᴀᄼぶх◦喑Ꭼ∈Ꮑ⩕λ⩢ၽ䃫ิহ⩢ߕ↪䒓ȡ ⶘⩢↍Ƞ䨯⾧⅁⩢↍ぶ喎ᬍ∂ౕⴚ᱌ڲ჋⣝๔㻱὎
ѳ䮼Ɑ⩢ߕ↪䒓Ƞו㘪⩢〆ぶ䶳ഌᄦ倅㘪䛼ჳᏓ⩢ ⮱ੳ͇Ꮑ⩕ [3-5] ȡ఍ₑ喑ౕ⣝ᰶ⩢↍㈨㐌⮱ധ⵭̷ᐭ
↍⮱䰭Ⅿ̺᫚෋ߍ喑э㐌䨯⻨ၽ⩢↍ጟ̺㘪␎䋠㺮 ࣾ倅㘪䛼ჳᏓ⩢↍䲋፥䛺㺮喑ڣ͚ᰭキࢂᰶ᩵⮱᫦

ᩣ⽬ᬒ᱌喟2022-10-24; Ⴧ⩕ᬒ᱌喟2022-12-26; DOI: 10.13550/j.jxhg.20220973
҉㔲キϸ喟ᅦ֟ⶂ喍1999ÿ喎喑⩤喑ⶂธ⩌ȡ㖁㈨ϧ喟ॡ᭫ᬻ喍1967ÿ喎喑⩤喑᪆ᢵ喑E-mail喟xianmingwu@163.comȡ