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Enhancement of the Rate Capability of Graphite via the Introduction of Boron–oxygen Functional Groups

机译:通过引入硼氧官能团增强石墨的速率能力

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The rate capability of graphite was enormously enhanced by introducing (meta)boric acid containingboron搊xygen groups onto its surface. Sample that had been heat-treated at 1000C exhibited twotimes larger capacity at even 5C discharge rate than those of the as-received sample. The presence of(meta)boric acid on the surface of graphite reduced the resistance and capacitance of surface filmsrelated to lithium ion migration and charge transfer resistance. However, the samples heat-treated attemperatures above 1500C showed no improvements in rate capability due to the disappearance ofboron搊xygen groups from the graphite surface.
机译:通过在其表面引入含硼搊氧基的(偏)硼酸,极大地提高了石墨的倍率能力。在1000℃下进行了热处理的样品即使在5℃的放电速率下也显示出两倍于所接收样品的容量。石墨表面上的(偏)硼酸的存在降低了与锂离子迁移和电荷转移电阻相关的表面膜的电阻和电容。但是,在1500℃以上进行热处理的样品由于硼表面上的硼氧根基团从石墨表面消失而没有显示出速率能力的提高。

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