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首页> 外文期刊>Journal of power sources >Porous carbon-coated silica macroparticles as anode materials for lithium ion batteries: Effect of boric acid
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Porous carbon-coated silica macroparticles as anode materials for lithium ion batteries: Effect of boric acid

机译：多孔碳包覆的二氧化硅大颗粒作为锂离子电池的负极材料：硼酸的作用

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摘要

We report carbon-coated porous silica macroparticles (SiO_2@C) prepared using polymeric templates and subsequent carbonization with sucrose for improved electrochemical energy storage in lithium-ion batteries (LIBs). In addition, boron is introduced to improve the stability of electrochemical cells by pyrolyzing mixtures of sucrose and boric acid (SiO_2@C + B) under inert atmosphere. The initially large surface area of porous SiO_2 (S_(BET) ～ 658 m~2 g~(-1)) is reduced to 102 m~2 g~(-1) after carbonization and introduction of boric acid. Surface of both SiO_2@C and SiO_2@C + B are covered with amorphous carbon. In particular, SiO_2@C + B particles containing borosilicate (Si-O-B) phase and B-0 bondings and Si-C -O bondings are also detected from the X-ray photoelectron spectra. The SiO_2@C + B macroparticles shows high reversible charge capacity up to 503 mAh g~(-1) after 103 cycles of Li intercalation/de-intercalation although initial capacity was 200 mAh g~(-1). The improved charge capacity of SiO_2@C + B is attributed to formation of advantageous microstructures induced from boric acid.
机译：我们报道了使用聚合物模板制备碳涂层的多孔二氧化硅大颗粒（SiO_2 @ C），然后用蔗糖碳化以改善锂离子电池（LIBs）中的电化学能量存储。另外，引入硼以通过在惰性气氛下热解蔗糖和硼酸的混合物（SiO_2 @ C + B）来提高电化学电池的稳定性。碳化和引入硼酸后，多孔SiO_2的初始大表面积（S_（BET）〜658 m〜2 g〜（-1））减小为102 m〜2 g〜（-1）。 SiO_2 @ C和SiO_2 @ C + B的表面均覆盖有非晶碳。特别地，还从X射线光电子能谱中检测到含有硼硅酸盐（Si-O-B）相和B-0键以及Si-C-O键的SiO_2 @ C + B颗粒。 SiO_2 @ C + B大颗粒在锂离子嵌入/脱嵌103次循环后仍显示出高达503 mAh g〜（-1）的高可逆充电容量，尽管初始容量为200 mAh g〜（-1）。 SiO_2 @ C + B电荷容量的提高归因于硼酸诱导形成的有利的微观结构。

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  • 来源
    《Journal of power sources》 |2014年第25期|689-695|共7页
  • 作者

    Young-Kuk Kim; Jong-Woo Moon; Jung-Goo Lee; Youn-Kyung Baek; Seong-Hyun Hong;

  • 作者单位

    Department of Powder/Ceramic Materials Research, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam 641-010, Republic of Korea;

    Department of Powder Materials Research, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam 641-010, Republic of Korea;

    Department of Powder Materials Research, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam 641-010, Republic of Korea;

    Department of Powder Materials Research, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam 641-010, Republic of Korea;

    Department of Powder Materials Research, Korea Institute of Materials Science (KIMS), Changwon, Kyungnam 641-010, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Porous materials; Silica; Boric acid; Carbon;

    机译：多孔材料二氧化硅硼酸碳;

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