Ultrathin Graphite Foam: A Three-Dimensional Conductive Network for Battery Electrodes
Ultrathin Graphite Foam: A Three-Dimensional Conductive Network for Battery Electrodes
复制标题
DOI：
10.1021/nl300528p
复制
发表时间：
2012-05-01
期刊：
影响因子：
10.8
通讯作者：
Ruoff, Rodney S.
中科院分区：
文献类型：
--
作者：
Ji, Hengxing;Zhang, Lili;Ruoff, Rodney S.
我们报道了使用独立的、轻质的、高导电性的石墨泡沫（UGF），其装载有磷酸铁锂（LFP），作为锂离子电池中的阴极。在1280 mA g（-1）的高充/放电电流密度下，负载在UGF上的LFP的比容量为70 mAh g（-1），而负载在Al箔上的LFP失效。以电极的总质量计，UGF/LFP阴极的最大比容量比Al/LFP阴极的最大比容量高23%，比泡沫镍/LFP阴极的最大比容量高170%。使用UGF，可以同时实现更高的倍率性能和比容量，这是由于其导电性（在室温下类似于1.3 × 10（5）S m（-1））和三维轻质（类似于9.5 mg cm（-3））石墨结构。同时，与通常用作锂离子电池中的导电基底的Al和Ni箔相比，UGF呈现出优异的电化学稳定性。此外，制备的UGF电极是容易的，成本效益，并与各种电化学活性材料兼容。
We report the use of free-standing, lightweight, and highly conductive ultrathin graphite foam (UGF), loaded with lithium iron phosphate (LFP), as a cathode in a lithium ion battery. At a high charge/discharge current density of 1280 mA g(-1), the specific capacity of the LFP loaded on UGF was 70 mAh g(-1), while LFP loaded on Al foil failed. Accounting for the total mass of the electrode, the maximum specific capacity of the UGF/LFP cathode was 23% higher than that of the Al/LFP cathode and 170% higher than that of the Ni-foam/LFP cathode. Using UGF, both a higher rate capability and specific capacity can be achieved simultaneously, owing to its conductive (similar to 1.3 x 10(5) S m(-1) at room temperature) and three-dimensional lightweight (similar to 9.5 mg cm(-3)) graphitic structure. Meanwhile, UGF presents excellent electrochemical stability comparing to that of Al and Ni foils, which are generally used as conductive substrates in lithium ion batteries. Moreover, preparation of the UGF electrode was facile, cost-effective, and compatible with various electrochemically active materials.