Multi-layered composite electrodes of high power Li4Ti5O12 and high capacity SnO2 for smart lithium ion storage
<p>Discrete layering of high power Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> and high capacity SnO<sub>2</sub> in a through-thickness multi-layered composite electrode was achieved using a layer-by-layer spray printing approach...
| Glavni autori: | , , |
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| Format: | Journal article |
| Jezik: | English |
| Izdano: |
Elsevier
2021
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| Sažetak: | <p>Discrete layering of high power Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> and high capacity SnO<sub>2</sub> in a through-thickness multi-layered composite electrode was achieved using a layer-by-layer spray printing approach in order to explore new capacity-power combinations for lithium ion based electrochemical energy storage. Electrochemical behavior of multi-layered electrodes was optimized as a function of the thickness of the discrete SnO<sub>2</sub> layer, in the range 2 to 6 µm, interleaved between two layers of low volume expansion Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>. Three discrete layers of 2 µm SnO<sub>2</sub> were then interleaved evenly between Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> layers to produce a “layer cake” negative electrode cross-section that offered remarkable rate capability when coupled with a spray printed LiFePO<sub>4</sub> positive electrode in a lithium ion battery arrangement. The multi-layered negative electrode was also coupled with a spray printed activated carbon positive electrode in a lithium ion capacitor configuration, providing significant improvements in energy density. The double-sided fabrication of the multi-layer electrode over a 20 × 20 cm<sup>2</sup> current collector area suggested a possible hybrid electrochemical device that combines attributes of high capacity lithium ion batteries and high power lithium ion capacitors.</p> |
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