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High-performance Bi2O3-NC anodes through constructing carbon shells and oxygen vacancies for flexible battery-supercapacitor hybrid devices
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-12-9 , DOI: 10.1039/d0na00831a Chao Yang 1 , Qi Jia 1 , Qianqian Pan 1 , Wentao Qi 1 , Rui Ling 1 , Bingqiang Cao 1
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-12-9 , DOI: 10.1039/d0na00831a Chao Yang 1 , Qi Jia 1 , Qianqian Pan 1 , Wentao Qi 1 , Rui Ling 1 , Bingqiang Cao 1
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Battery-supercapacitor hybrid (BSH) devices generally provide both high energy density and power density, but usually suffer from the serious electrochemical kinetics mismatch of cathodes and anodes mainly due to complex faradaic reactions of the unmatched battery-type electrodes used for charge storage, which inevitably degrade the rate capability and power density. To solve this, we propose a facile and efficient strategy of constructing carbon shells and oxygen vacancies. Oxygen-deficient Bi2O3 nanoflakes stabilized by N-doped carbon and supported on graphite fibers (GF@Bi2O3–NCs) were prepared to improve specific capacity, rate capability and cycling stability. The N/S-codoped carbon aerogels supported on graphite fibers (GF@NS-CAGs) provided a high capacitance of 312 F g−1 at 1 A g−1, which was mainly attributed to the microporous structure and high active N content. The flexible quasi-solid-state BSH device based on the GF@Bi2O3-NC anode and the GF@NS-CAG cathode with a stable voltage window of 2.3 V could deliver a remarkable capacity of 103 mA h g−1, an energy density of 118 W h kg−1 and capacity retention of 95.7% after 10 000 cycles, reflecting that this was a highly-efficient approach to develop high-performance flexible energy storage devices.
中文翻译：
通过构建碳壳和氧空位来制备高性能 Bi2O3-NC 阳极，用于柔性电池-超级电容器混合器件
电池-超级电容器混合（BSH）装置通常同时提供高能量密度和功率密度，但通常会遭受阴极和阳极严重的电化学动力学失配，这主要是由于用于电荷存储的不匹配的电池型电极的复杂法拉第反应，这不可避免地降低倍率能力和功率密度。为了解决这个问题，我们提出了一种简单有效的构建碳壳和氧空位的策略。制备了由氮掺杂碳稳定并负载在石墨纤维上的缺氧Bi 2 O 3纳米片(GF@Bi 2 O 3 –NCs)，以提高比容量、倍率性能和循环稳定性。石墨纤维负载的N/S共掺杂碳气凝胶（GF@NS-CAGs）在1 A g -1下提供了312 F g -1的高电容，这主要归因于其微孔结构和高活性氮含量。基于GF@Bi 2 O 3 -NC阳极和GF@NS-CAG阴极的柔性准固态BSH器件具有2.3 V的稳定电压窗口，可以提供103 mA hg -1的卓越容量，能量密度为118 W h kg −1，10 000次循环后容量保持率为95.7%，表明这是开发高性能柔性储能器件的高效方法。
更新日期：2020-12-22
中文翻译：
通过构建碳壳和氧空位来制备高性能 Bi2O3-NC 阳极，用于柔性电池-超级电容器混合器件
电池-超级电容器混合（BSH）装置通常同时提供高能量密度和功率密度，但通常会遭受阴极和阳极严重的电化学动力学失配，这主要是由于用于电荷存储的不匹配的电池型电极的复杂法拉第反应，这不可避免地降低倍率能力和功率密度。为了解决这个问题，我们提出了一种简单有效的构建碳壳和氧空位的策略。制备了由氮掺杂碳稳定并负载在石墨纤维上的缺氧Bi 2 O 3纳米片(GF@Bi 2 O 3 –NCs)，以提高比容量、倍率性能和循环稳定性。石墨纤维负载的N/S共掺杂碳气凝胶（GF@NS-CAGs）在1 A g -1下提供了312 F g -1的高电容，这主要归因于其微孔结构和高活性氮含量。基于GF@Bi 2 O 3 -NC阳极和GF@NS-CAG阴极的柔性准固态BSH器件具有2.3 V的稳定电压窗口，可以提供103 mA hg -1的卓越容量，能量密度为118 W h kg −1，10 000次循环后容量保持率为95.7%，表明这是开发高性能柔性储能器件的高效方法。
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