Investigation of Electrochemical Performance and Gas Swelling Behavior on Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>/Activated Carbon Lithium-Ion Capacitor with Acetonitrile-Based and Ester-Based Electrolytes
Lithium-ion capacitors (LICs) have gained significant attention due to the combination on the advantages of electric double-layer capacitors (EDLCs) and lithium-ion batteries (LIBs). Herein, the LIC pouch cell was fabricated by an activated carbon (AC) cathode and a Li<sub>4</sub>Ti<s...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/779253c5b8d646faaf171a77313af31a |
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| Sumario: | Lithium-ion capacitors (LICs) have gained significant attention due to the combination on the advantages of electric double-layer capacitors (EDLCs) and lithium-ion batteries (LIBs). Herein, the LIC pouch cell was fabricated by an activated carbon (AC) cathode and a Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO) anode. Two organic electrolytes (1 mol L<sup>−1</sup> LiBF<sub>4</sub>/acetonitrile (AN) and 1 mol L<sup>−1</sup> LiPF<sub>6</sub>/ ethylene carbonate (EC) + ethyl methyl carbonate (EMC) + dimethyl carbonate (DMC)) were chosen and the gas swelling behavior was studied. Compared with the ester-based LIC, the AN-based LIC displays higher energy density of 13.31 Wh kg<sup>−1</sup> at 11.4 W kg<sup>−1</sup> and even provides a value of 9.1 Wh kg<sup>−1</sup> at 1075 W kg<sup>−1</sup>. Because of the lower DC Resistance of 0.761 mΩ, the maximum power density of the AN-based LIC reaches 12.5 kW kg<sup>−1</sup>. The AN-based LIC delivers good stability with an energy retention of 88.3% after 900 cycles. It is discovered that the swelling behavior of AN-based LICs is more serious and the major component is H<sub>2</sub>. The difference of swelling behavior among the LICs, lithium nickel cobalt manganese oxide (NCM)/LTO LIB and AC/AC EDLC is proposed to be caused by the AC electrode and the interfacial reaction of LTO. |
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