Silica depleted rice hull ash (SDRHA), an agricultural waste, as a high-performance hybrid lithium-ion capacitor,Green Chemistry

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Silica depleted rice hull ash (SDRHA), an agricultural waste, as a high-performance hybrid lithium-ion capacitor
Green Chemistry ( IF 9.3 ) Pub Date : 2020-06-26 , DOI: 10.1039/d0gc01746a
Eleni Temeche _{1,

2,

3,

4} , Mengjie Yu _{1,

2,

3,

4} , Richard M. Laine _{1,

2,

3,

4}

Affiliation

Rice hull ash (RHA, an agricultural waste) produced during combustion of rice hulls to generate electricity consists (following dilute acid leaching) of high surface area SiO₂ (80–90 wt%) and 10–20 wt% carbon (80 m² g⁻¹ total). RHA SiO₂ is easily extracted by distillation (spirosiloxane) producing SDRHA, which offers an opportunity to develop “green” hybrid lithium-ion capacitors (LICs) electrodes. SDRHA consists of 50–65 wt% SiO₂ with the remainder carbon with a specific surface area of ≈220 m² g⁻¹. SDRHA microstructure presents a highly irregular and disordered nanocomposite composed of nanosilica closely connected via graphene layers enhancing Li-ion mobility during charge/discharge process. SDRHA electrochemical properties were assessed by assembling Li/SDRHA half-cells and LiNi_0.6Co_0.2Mn_0.2O₂ (NMC622)-SDRHA full-cells. The half-cell delivered a high specific capacity of 250 mA h g⁻¹ at 0.5C and retained a capacity of 200 mA h g⁻¹ at 2C for 400 h. In contrast to the poor cycle performance of NMC based batteries at high C-rates, the hybrid full-cell demonstrated a high specific capacitance of 200 F g⁻¹ at 4C. In addition, both the half and full hybrid cells demonstrate excellent coulombic efficiencies (∼100%). These results suggest that low cost and environmentally friendly SDRHA, may serve as a potential alternative electrode material for LICs.

中文翻译：

二氧化硅耗尽的稻壳灰（SDRHA），一种农业废料，用作高性能混合锂离子电容器

稻壳燃烧过程中产生的电能产生的稻壳灰（RHA，一种农业废物）由高表面积SiO ₂（80–90 wt％）和10–20 wt％碳（80 m ²）组成（稀酸浸出后）。总共g ^-1）。RHA SiO ₂易于通过蒸馏（螺硅氧烷）生产SDRHA萃取，这为开发“绿色”混合锂离子电容器（LICs）电极提供了机会。SDRHA由50–65 wt％的SiO ₂组成，其余碳的比表面积约为220 m ² g ^-1。SDRHA微观结构呈现出高度不规则且无序的纳米复合材料，该复合材料由通过石墨烯层增强了锂离子在充电/放电过程中的迁移率。通过组装Li / SDRHA半电池和LiNi _0.6 Co _0.2 Mn _0.2 O ₂（NMC622）-SDRHA全电池来评估SDRHA的电化学性能。该半电池在0.5C下传递250 mA hg ^-1的高比容量，并在2C下保持200 mA hg ^-1的容量400 h。与基于NMC的电池在高C速率下较差的循环性能相反，混合型全电池具有200 F g ^-1的高比电容在4C。此外，半混合电池和全混合电池均显示出优异的库仑效率（〜100％）。这些结果表明，低成本和环保的SDRHA可以作为LIC的潜在替代电极材料。

更新日期：2020-07-20

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