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首页> 外文期刊>Chemistry: A European journal >Sucrose-assisted loading of LiFePO_4 nanoparticles on graphene for high-performance lithium-ion battery cathodes
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Sucrose-assisted loading of LiFePO_4 nanoparticles on graphene for high-performance lithium-ion battery cathodes

机译：蔗糖辅助的LiFePO_4纳米颗粒在石墨烯上的负载，用于高性能锂离子电池正极

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摘要

A simple approach for loading LiFePO_4 (LFP) nanoparticles on graphene (G) that could assemble amorphous LiFePO_4 nanoparticles into a stable, crystalline, graphene-modified layered materials (G-S-LFP, S=sucrose) by using graphene as building block and sucrose as a linker has yet to be developed. On the basis of differential scanning calorimetric and transmission electron microscopy analysis of the samples from controlled experiment, a possible mechanism was proposed to explain the "linker" process of LFP and graphene with sucrose as the linker. The electrochemical properties of the samples as cathode material for lithium-ion batteries were studied by cyclic voltammogrametry and galvanostatic methods. Results showed that G-S-LFP displayed superior lithium-storage capability with current density changes randomly form 0.5 to 10C. The significant improvement for rate and cycle performance could be attributed to the high conductivity of the graphene host, the high crystallinity, and the layered structure. Pimp the battery: High-crystalline G-S-LFP composites (G=graphene, S=sucrose, LFP=LiFePO _4; see figure) were synthesized from graphene and sucrose to assemble amorphous LFP nanoparticles into a stable material that shows superior lithium-storage capability with current density changes of 0.5-10C. The significant improvement in rate and cycle performance could be attributed to the high conductivity of the graphene host, the high crystallinity, the majority of sp~2 carbon modifications, and the uniform layered structure.
机译：一种将LiFePO_4（LFP）纳米粒子加载到石墨烯（G）上的简单方法，该方法可以通过使用石墨烯作为结构单元，将蔗糖作为链接器尚未开发。在差示扫描量热法和透射电镜分析受控样品的基础上，提出了一种可能的机制来解释以蔗糖为连接基的LFP和石墨烯的“连接基”过程。通过循环伏安法和恒电流法研究了样品作为锂离子电池正极材料的电化学性能。结果表明，G-S-LFP表现出优异的锂存储能力，电流密度在0.5至10C之间随机变化。速率和循环性能的显着改善可归因于石墨烯主体的高电导率，高结晶度和分层结构。皮条电池：由石墨烯和蔗糖合成高结晶GS-LFP复合材料（G =石墨烯，S =蔗糖，LFP = LiFePO _4;见图），将无定形LFP纳米颗粒组装成稳定的材料，显示出优异的锂存储能力电流密度变化为0.5-10C。速率和循环性能的显着改善可归因于石墨烯主体的高电导率，高结晶度，大多数sp〜2碳修饰和均匀的层状结构。

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