Li4Ti5O12−TiO2 Composite Coated on Carbon Foam as Anode Material for Lithium Ion Capacitors: Evaluation of Rate Performance and Self‐Discharge,ChemNanoMat

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Li4Ti5O12−TiO2 Composite Coated on Carbon Foam as Anode Material for Lithium Ion Capacitors: Evaluation of Rate Performance and Self‐Discharge
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-01-09 , DOI: 10.1002/cnma.201900682
Huanhuan Zhou _{1,

2} , Qun Ma _{1,

2} , Wei Yang _{1,

2} , Xianmao Lu _{1,

2,

3}

Affiliation

Li₄Ti₅O₁₂‐TiO₂ (LTO‐TO) composite is coated on carbon foam (CF) for anode of lithium ion capacitors (LICs). The resulting CF@LTO‐TO electrodes with varied mass loadings of LTO‐TO exhibit much improved rate performance compared to pristine LTO electrode. Specifically, asymmetric LICs based on activated carbon cathode and CF@LTO‐TO anode (AC//CF@LTO‐TO) with 25 wt% of LTO‐TO delivers a specific capacity of 65 mAh g⁻¹ at 300 C. In addition, the self‐discharge rates of the LICs are evaluated. It is found that AC//CF@LTO‐TO LIC with 45 wt% of LTO‐TO shows much reduced self‐discharge rate (open circuit voltage drops from 2.5 to 1.1 V in 144 hours) relative to AC//CF@LTO‐TO with different LTO‐TO mass loadings. The results of this study suggest that the introduction of TO in LTO anode can affect both the rate performance and the self‐discharge behavior, which may be due to the fast faradaic reaction kinetic of TO and the rich LTO‐TO grain boundary interfaces.

中文翻译：

碳泡沫作为锂离子电容器阳极材料的Li4Ti5O12-TiO2复合涂层：速率性能和自放电的评估

Li ₄ Ti ₅ O ₁₂ -TiO ₂（LTO-TO）复合材料涂覆在碳泡沫（CF）上，作为锂离子电容器（LICs）的阳极。与原始LTO电极相比，所产生的CF @ LTO-TO电极具有不同的LTO-TO质量负载，其速率性能大大提高。具体来说，基于活性炭阴极和CF @ LTO-TO阳极（AC // CF @ LTO-TO）的非对称LIC，其LTO-TO为25 wt％，其比容量为65 mAh g ^-1在300°C下进行。此外，还对LIC的自放电率进行了评估。已经发现，相对于AC // CF @ LTO，具有45％（重量）的LTO-TO的AC // CF @ LTO-TO LIC显示出大大降低的自放电率（144小时内开路电压从2.5 V降至1.1 V）。 ‐TO具有不同的LTO‐TO质量负载。这项研究的结果表明，将TO引入LTO阳极会影响速率性能和自放电行为，这可能是由于TO的快速法拉第反应动力学和丰富的LTO-TO晶界界面所致。

更新日期：2020-01-09

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