Jiyuan Xue, Haitang Zhang, Jianken Chen, Kai Fang, Yilong Chen, Yeguo Zou, Yu-Hao Hong, Yu Qiao, Shi-Gang Sun
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引用次数: 0
Abstract
Hard carbon (HC) is a promising anode candidate for Na-ion batteries (NIBs) because of its excellent Na-storage performance, abundance, and low cost. However, a precise understanding of its Na-storage behavior remains elusive. Herein, based on the D2O/H2SO4-based TMS results collected on charged/discharged state HC electrodes, detailed Na-storage mechanisms (the Na-storage states and active sites in different voltage regions), specific SEI dynamic evolution process (formation, rupture, regeneration and loss), and irreversible capacity contribution (dead Na0, NaH, etc.) were elucidated. Moreover, by employing the online electrochemical mass spectrometry (OEMS) to monitor the gassing behavior of HC-Na half-cell during the overdischarging process, a surprising rehydrogen evolution reaction (re-HER) process at around 0.02 V vs Na+/Na was identified, indicating the occurrence of Na-plating above 0 V vs Na+/Na. Additionally, the typical fluorine ethylene carbonate (FEC) additive was demonstrated to reduce the accumulation of dead Na0 and inhibit the re-HER process triggered by plated Na.
硬碳(HC)具有优异的贮纳性能、丰富的资源和低廉的成本,因此是一种很有前景的镍离子电池(NIB)阳极候选材料。然而,人们对其蓄呐行为的精确理解仍是空白。本文基于在充放电状态 HC 电极上收集到的基于 D2O/H2SO4 的 TMS 结果,阐明了详细的储纳机理(不同电压区域的储纳状态和活性位点)、特定的 SEI 动态演化过程(形成、破裂、再生和损失)以及不可逆容量贡献(死 Na0、NaH 等)。此外,通过采用在线电化学质谱(OEMS)监测 HC-Na 半电池在过放电过程中的放气行为,发现在 0.02 V 对 Na+/Na 左右出现了令人惊讶的再氢进化反应(re-HER)过程,表明在 0 V 对 Na+/Na 以上出现了 Na 镀层。此外,典型的碳酸氟乙烯(FEC)添加剂被证明可减少死亡 Na0 的积累,并抑制由镀 Na 引发的再氢化反应过程。
期刊介绍:
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
- Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale
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- Modeling and simulation of synthetic, assembly, and interaction processes
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- Applications of nanoscale materials in living and environmental systems
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