Superconcentrated electrolytes for a high-voltage lithium-ion battery
Abstract
Finding a viable electrolyte for next-generation 5 V-class lithium-ion batteries is of primary importance. A long-standing obstacle has been metal-ion dissolution at high voltages. The LiPF[6] salt in conventional electrolytes is chemically unstable, which accelerates transition metal dissolution of the electrode material, yet beneficially suppresses oxidative dissolution of the aluminium current collector; replacing LiPF[6] with more stable lithium salts may diminish transition metal dissolution but unfortunately encounters severe aluminium oxidation. Here we report an electrolyte design that can solve this dilemma. By mixing a stable lithium salt LiN(SO[2]F)[2] with dimethyl carbonate solvent at extremely high concentrations, we obtain an unusual liquid showing a three-dimensional network of anions and solvent molecules that coordinate strongly to Li[+] ions. This simple formulation of superconcentrated LiN(SO[2]F)[2]/dimethyl carbonate electrolyte inhibits the dissolution of both aluminium and transition metal at around 5 V, and realizes a high-voltage LiNi[0.5]Mn[1.5]O[4]/graphite battery that exhibits excellent cycling durability, high rate capability and enhanced safety.
Journal
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- Nature Communications
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Nature Communications 7 12032-, 2016-06-29
Springer Nature
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Keywords
Details 詳細情報について
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- CRID
- 1050282810826115456
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- NII Article ID
- 120006335663
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- ISSN
- 20411723
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- HANDLE
- 2433/226836
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- Crossref
- CiNii Articles
- KAKEN