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Pre‐Oxidation‐Tuned Microstructures of Carbon Anodes Derived from Pitch for Enhancing Na Storage Performance
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-08-09 , DOI: 10.1002/aenm.201800108 Yaxiang Lu 1 , Chenglong Zhao 1 , Xingguo Qi 1 , Yuruo Qi 1 , Hong Li 1 , Xuejie Huang 1 , Liquan Chen 1 , Yong-Sheng Hu 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-08-09 , DOI: 10.1002/aenm.201800108 Yaxiang Lu 1 , Chenglong Zhao 1 , Xingguo Qi 1 , Yuruo Qi 1 , Hong Li 1 , Xuejie Huang 1 , Liquan Chen 1 , Yong-Sheng Hu 1
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Disordered carbons have captured extensive interest as anode materials for Na‐ion batteries (NIBs) due to the abundant resources, competitive specific capacity, and low cost. Here, a facile strategy of pre‐oxidation is successfully adopted to tune the microstructure of carbon anode to facilitate sodium storage. Pitch is selected as the low‐cost and high carbon yield precursor. An easy pre‐oxidation treatment in air can enable pitch to realize an effective structural conversion from ordered to disordered at further carbonization processes. Compared with the carbonized pristine pitch, the carbonized pre‐oxidation pitch increases the carbon yield from 54 to 67%, the sodium storage capacity from 94.0 to 300.6 mAh g−1, and the initial Coulombic efficiency from 64.2 to 88.6%. Experiment results reveal that the introduction of oxygen based functional groups is the key to achieve the highly disordered structure, not only ensuring the cross‐linkage during low‐temperature pre‐oxidation process but also suppressing the carbon structure from melting and rearranging in the high‐temperature carbonization process. Most importantly, this facile pre‐oxidation strategy can also be extended to other carbon precursors to facilitate the low‐cost and high‐performance disordered carbon anodes for NIBs and beyond.
中文翻译：
沥青衍生的碳阳极的预氧化微结构，用于增强钠的储存性能
无序的碳由于其丰富的资源，具有竞争力的比容量和低成本而作为Na-ion电池（NIB）的负极材料引起了广泛的兴趣。在这里，成功地采用了一种简便的预氧化策略来调整碳阳极的微观结构，以利于钠的储存。沥青被选为低成本和高碳收率的前身。在空气中进行简单的预氧化处理可以使沥青在进一步的碳化过程中实现从有序到无序的有效结构转化。与碳化的原始沥青相比，碳化的预氧化沥青将碳收率从54％提高至67％，钠存储容量从94.0 mAh提高至300.6 mAh g -1，初始库仑效率从64.2提高到88.6％。实验结果表明，引入氧基官能团是获得高度无序结构的关键，不仅可以确保低温预氧化过程中的交联，而且还可以抑制碳结构在高氧下熔化和重排。高温碳化过程。最重要的是，这种简便的预氧化策略还可以扩展到其他碳前体，以促进针对NIBs以及其他应用的低成本和高性能无序碳阳极。
更新日期：2018-08-09
中文翻译：
沥青衍生的碳阳极的预氧化微结构，用于增强钠的储存性能
无序的碳由于其丰富的资源，具有竞争力的比容量和低成本而作为Na-ion电池（NIB）的负极材料引起了广泛的兴趣。在这里，成功地采用了一种简便的预氧化策略来调整碳阳极的微观结构，以利于钠的储存。沥青被选为低成本和高碳收率的前身。在空气中进行简单的预氧化处理可以使沥青在进一步的碳化过程中实现从有序到无序的有效结构转化。与碳化的原始沥青相比，碳化的预氧化沥青将碳收率从54％提高至67％，钠存储容量从94.0 mAh提高至300.6 mAh g -1，初始库仑效率从64.2提高到88.6％。实验结果表明，引入氧基官能团是获得高度无序结构的关键，不仅可以确保低温预氧化过程中的交联，而且还可以抑制碳结构在高氧下熔化和重排。高温碳化过程。最重要的是，这种简便的预氧化策略还可以扩展到其他碳前体，以促进针对NIBs以及其他应用的低成本和高性能无序碳阳极。
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