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High-temperature treatment induced carbon anode with ultrahigh Na storage capacity at low-voltage plateau
Science Bulletin ( IF 18.9 ) Pub Date : 2018-07-25 , DOI: 10.1016/j.scib.2018.07.018
Chenglong Zhao 1 , Qidi Wang 2 , Yaxiang Lu 1 , Baohua Li 3 , Liquan Chen 1 , Yong-Sheng Hu 1
Affiliation  

Sodium-ion batteries (NIBs) show great prospect on the energy storage applications benefiting from their low cost and the abundant Na resources despite the expected lower energy density compared with lithium-ion batteries (LIBs). To further enhance the competitive advantage, especially in energy density, developing the high-capacity carbon anode materials can be one of the effective approaches to realize this goal. Herein, we report a novel carbon anode made from charcoal with a high capacity of ∼400 mAh g−1, wherein about 85% (>330 mAh g−1) of its total capacity is derived from the long plateau region below ∼0.1 V, which differs from those of typical hard carbon materials (∼300 mAh g−1) in NIBs but is similar to the graphite anode in LIBs. When coupled with air-stable Na0.9Cu0.22Fe0.30Mn0.48O2 oxide cathode, a high-energy density of ∼240 Wh kg−1 is achieved with good rate capability and cycling stability. The discovery of this promising carbon anode is expected to further improve the energy density of NIBs towards large-scale electrical energy storage.



中文翻译:

高温处理诱导碳负极在低压平台具有超高储钠能力

尽管与锂离子电池 (LIB) 相比预期能量密度较低,但钠离子电池 (NIB) 得益于其低成本和丰富的 Na 资源,在储能应用方面显示出巨大的前景。为了进一步提升竞争优势,尤其是在能量密度方面,开发高容量碳负极材料可能是实现这一目标的有效途径之一。在此,我们报告了一种由木炭制成的新型碳负极,其容量高达 ~400 mAh g -1,其中约 85%(>330 mAh g -1)的总容量来自低于~0.1 V 的长平台区域,不同于典型的硬碳材料(~300 mAh g -1) 在 NIB 中,但类似于 LIB 中的石墨阳极。当与空气稳定的Na 0.9 Cu 0.22 Fe 0.30 Mn 0.48 O 2氧化物正极耦合时,实现了~240 Wh kg -1的高能量密度,具有良好的倍率性能和循环稳定性。这种有前途的碳阳极的发现有望进一步提高 NIBs 的能量密度,以实现大规模电能存储。

更新日期:2018-07-25
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