当前位置: X-MOL 学术Mater. Chem. Front. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Temperature-regulated biomass-derived hard carbon as a superior anode for sodium-ion batteries
Materials Chemistry Frontiers ( IF 7 ) Pub Date : 2021-08-26 , DOI: 10.1039/d1qm00911g
Rong-Rong Li 1 , Xiang-Xi He 1 , Zhuo Yang 1 , Xiao-Hao Liu 1 , Yun Qiao 1 , Li Xu 1 , Li Li 1 , Shu-Lei Chou 1, 2
Affiliation  

Hard carbon is considered as one of the most promising carbonaceous anode materials to promote the commercialization of sodium-ion batteries (SIBs). However, the low initial coulombic efficiency (ICE) of hard carbon materials and the mechanism of sodium storage are still controversial, which seriously restricts their practical applications in SIBs. Herein, hard carbon materials with a multichannel structure derived from golden berry leaves were successfully prepared via a simple carbonization method that was carried out in the temperature range of 1000 °C to 2000 °C. The initial discharge capacity of the sample carbonized at 1400 °C can reach 338.7 mA h g−1 at 20 mA g−1, and deliver an excellent ICE of 86.43%. Furthermore, when the carbonization temperature reaches 2000 °C, the contribution of the plateau-specific capacity can reach up to 91.11%. Combining both experimental characterization results and analysis, the mechanism of sodium storage in hard carbon can be considered as the slope capacity corresponding to the adsorption of sodium ions on defect sites and heteroatoms, while the plateau capacity corresponds to the sodium ion intercalation into the interlayers and filling in the micropores.

中文翻译:

温度调节的生物质衍生硬碳作为钠离子电池的优良阳极

硬碳被认为是最有前途的碳质负极材料之一,可促进钠离子电池(SIBs)的商业化。然而,硬碳材料的低初始库仑效率(ICE)和储钠机制仍存在争议,严重制约了其在SIBs中的实际应用。在此,通过在 1000°C 至 2000°C 的温度范围内进行的简单碳化方法,成功制备了源自金色浆果叶的多通道结构硬碳材料。1400℃碳化样品的初始放电容量可达338.7 mA hg -1 at 20 mA g -1,并提供 86.43% 的出色 ICE。此外,当碳化温度达到2000℃时,高原比容量的贡献可达91.11%。结合实验表征结果和分析,钠在硬碳中的储存机制可以被认为是钠离子在缺陷位点和杂原子上吸附对应的斜率容量,而平台容量对应于钠离子嵌入夹层和填充微孔。
更新日期:2021-09-14
down
wechat
bug