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首页> 外文期刊>Advanced energy materials >Low-Temperature Growth of Hard Carbon with Graphite Crystal for Sodium-Ion Storage with High Initial Coulombic Efficiency: A General Method
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Low-Temperature Growth of Hard Carbon with Graphite Crystal for Sodium-Ion Storage with High Initial Coulombic Efficiency: A General Method

机译：硬碳低温生长，具有高初始库仑效率的钠离子储存的石墨晶体：一般方法

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摘要

Practical application of hard carbon materials in sodium-ion batteries (SIBs) is largely limited by their low initial coulombic efficiency (ICE), which may be improved by increasing the graphitization degree. However, biomass-derived hard carbon is usually nongraphitizable and extremely difficult to graphitize by direct heating even at 3000 degrees C. Herein, a general strategy is reported for fabricating hard carbon materials with graphite crystals at 1300 degrees C promoted by external graphite that serves as a crystal template for the growth of graphite crystals. The graphite crystals enable the contacted pseudographitic domains with a high-level ordered structure, large domain size, and low defects, leading to an enhanced ICE. The obtained hard carbon materials with graphite crystals, using the carbonized eggshell membranes, and sucrose-derived microsphere as precursors, achieve very high ICE of 89% and 91% with reversible capacity of 310 and 301 mA h g(-1), respectively. Therefore, using external graphite to promote high-level ordering pseudographitic domains at low temperature is quite useful to improve ICE for SIB applications.
机译：硬碳材料在钠离子电池（SIB）中的实际应用主要受它们的低初始库仑效率（冰）的限制，这通过增加石墨化程度可以提高。然而，生物质衍生的硬碳通常是非显着的，并且即使在3000℃下也可以通过直接加热来石墨化。本文，据报道，在用诸如此外的外部石墨促进的1300℃下用石墨晶体制造硬碳材料的一般策略。石墨晶体生长的晶体模板。石墨晶体使接触的伪图座具有高级有序结构，大域尺寸和低缺陷，导致增强的冰。使用碳化的蛋壳膜和蔗糖衍生的微球作为前体，获得的硬碳材料，达到89％和91％的非常高的冰，可逆容量分别为310和301mA Hg（-1）。因此，使用外部石墨以促进低温下的高级排序伪图域对于改善SIB应用的冰非常有用。

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  • 来源
    《Advanced energy materials》 |2019年第10期|1803648.1 -1803648.10|共10页
  • 作者

    Zhao Xun; Ding Yuan; Xu Qi; Yu Xiao; Liu Yong; Shen Hui;

  • 作者单位

    Sun Yat Sen Univ Sch Mat Sci & Engn State Key Lab Optoelect Mat & Technol Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci & Engn State Key Lab Optoelect Mat & Technol Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci & Engn State Key Lab Optoelect Mat & Technol Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci & Engn State Key Lab Optoelect Mat & Technol Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Mat Sci & Engn State Key Lab Optoelect Mat & Technol Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Phys Guangzhou 510275 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    graphite crystal; hard carbon; initial Coulombic efficiency; low temperature; sodium-ion batteries;

    机译：石墨晶体;硬碳;初始库仑效率;低温;钠离子电池;

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