The rate performances of Li batteries are severely influenced by the electrochemical properties of anode material. The graphite foams (GFms) is prepared by simple process from mesophase pitch (MP) precursor. The physical and electrochemical properties are investigated for Li secondary battery anode. The rate performances of GFms anode cell is more than 92% at the 30 C-rate compare to 1 C-rate current, which is very promising to the high power applications such as electric vehicles. For the quantitative analysis of rate capability improvement, the charge transfer resistance and diffusivity are measured by microelectrode system with single particle and galvanostatic intermittent titration technique (GITT). The diffusion coefficient of GFms is in the range of 3.2 × 10⁻¹² - 2.0 × 10⁻⁹ cm²/s, which is 2 orders higher than that of commercialized graphite anodes.

中文翻译：

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锂二次电池用石墨泡沫负极提高倍率能力

锂电池的倍率性能受到负极材料的电化学性能的严重影响。石墨泡沫（GFms）是由中间相沥青（MP）前体通过简单的方法制备的。研究了锂二次电池负极的物理和电化学性能。相比于1 C速率电流，GFms阳极电池在30 C速率下的速率性能超过92％，这对于电动汽车等高功率应用非常有前途。为了定量分析速率能力的提高，采用单颗粒微电子系统和恒电流间歇滴定技术（GITT）测量了电荷转移电阻和扩散系数。GFMS的扩散系数在3.2×10的范围内^-12 - 2.0×10 ^-9厘米² / s，比商品化石墨阳极高2个数量级。