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首页> 外文会议>IUPAC 10th International conference on novel materials and their synthesis: Book of abstracts >ROLE OF GRAPHENE IN THE COMPOSTE FOR ADVANCED LITHIUM BATTERIES
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ROLE OF GRAPHENE IN THE COMPOSTE FOR ADVANCED LITHIUM BATTERIES

机译：石墨烯在高级锂电池堆中的作用

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摘要

Graphene is expected to be a good candidate as an additive material due to its superior electrical conductivity, excellent flexibility, and high surface area, as well as the open and flexible porous structure of graphene powders. Free-standing Si-G materials were synthesized by an in-situ filtration method. The Si nanoparticles are highly encapsulated in a graphene nanosheet matrix. The results show that Si-G composite film has high discharge capacity beyond 100 cycles (708 mAh g~(-1)). Li_4Ti_5O_(12) microspheres wrapped in graphene nanosheets were synthesized by a microwave-hydrothermal method for the preparation following by an annealing step. The resultant composite reveals a unique loose structure. Therefore the Li_4Ti_5O_(12)-G electrode has highly desirable properties. Li_3VO_4-G microbox with graphene nanosheets of about six layers of graphene was prepared by in situ hydrothermal method. The composite shows a reversible capacity of 223 mAh g~(-1) even at 20C. After 500 cycles at 10C there is no evident capacity fading. LiFePO_4 composites were synthesized. The specific capacity and charge-discharge efficiency of LiFePO_4 increase dramatically from 125 mAh g~(-1) (LiFePO_4) to 165 mAh g~(-1) (LiFePO_4/graphene (8%)). A highly stable reversible capacity of 80 mAh g~(-1) has been obtained at the highest current density of 10 C. Sulfur-C was synthesized by heating a mixture of graphene nanosheets and elemental sulfur. The electrochemical results show that the sulfur-graphene nanosheet composite significantly improved the electrical conductivity, the capacity, and the cycle stability. Financial support from an Australian Research Council Discovery Project (DP 100103909) and the National Natural Science Foundation of China (21073046) is greatly appreciated.
机译：石墨烯因其优越的导电性，出色的柔韧性和高表面积以及石墨烯粉末的开放性和柔性多孔结构，有望成为添加剂的良好选择。通过原位过滤方法合成独立的Si-G材料。 Si纳米颗粒被高度包封在石墨烯纳米片基质中。结果表明，Si-G复合膜具有超过100个循环的高放电容量（708 mAh g〜（-1））。通过微波-水热法合成包裹在石墨烯纳米片中的Li_4Ti_5O_（12）微球，然后通过退火步骤制备。所得复合材料显示出独特的松散结构。因此，Li_4Ti_5O_（12）-G电极具有非常理想的特性。通过原位水热法制备了具有约六层石墨烯的石墨烯纳米片的Li_3VO_4-G微箱。该复合物甚至在20℃下也显示出223mAh g·（-1）的可逆容量。在10C下进行500次循环后，容量没有明显下降。合成了LiFePO_4复合材料。 LiFePO_4的比容量和充放电效率从125 mAh g〜（-1）（LiFePO_4）急剧增加到165 mAh g〜（-1）（LiFePO_4 /石墨烯（8％））。在10 C的最高电流密度下已获得80 mAh g〜（-1）的高度稳定的可逆容量。通过加热石墨烯纳米片和元素硫的混合物合成了硫C。电化学结果表明，硫-石墨烯纳米片复合材料显着提高了电导率，电容量和循环稳定性。非常感谢澳大利亚研究委员会发现项目（DP 100103909）和国家自然科学基金（21073046）的资助。

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  • 来源
  • 会议地点 Zhengzhou(CN)
  • 作者

    J. Z. WANG; Y. SHI; C. ZHONG; L. LU; H.K. LIU; Y.P. WU;

  • 作者单位

    Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia;

    Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia,Deparment of Chemistry, Fudan University, Shanghai 200433, China;

    Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia;

    Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia;

    Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia;

    Deparment of Chemistry, Fudan University, Shanghai 200433, China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    anode materials; cathode materials; lithium batteries;

    机译：阳极材料；阴极材料；锂电池;

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