Liang Zheng, Lin Dingchang, Zhao Jie, Lu Zhenda, Liu Yayuan, Liu Chong, Lu Yingying, Wang Haotian, Yan Kai, Tao Xinyong, Cui Yi
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305;
Applied Physics, Stanford University, Stanford, CA 94305;
Proc Natl Acad Sci U S A. 2016 Mar 15;113(11):2862-7. doi: 10.1073/pnas.1518188113. Epub 2016 Feb 29.
Lithium metal-based battery is considered one of the best energy storage systems due to its high theoretical capacity and lowest anode potential of all. However, dendritic growth and virtually relative infinity volume change during long-term cycling often lead to severe safety hazards and catastrophic failure. Here, a stable lithium-scaffold composite electrode is developed by lithium melt infusion into a 3D porous carbon matrix with "lithiophilic" coating. Lithium is uniformly entrapped on the matrix surface and in the 3D structure. The resulting composite electrode possesses a high conductive surface area and excellent structural stability upon galvanostatic cycling. We showed stable cycling of this composite electrode with small Li plating/stripping overpotential (<90 mV) at a high current density of 3 mA/cm(2) over 80 cycles.
锂金属基电池因其高理论容量和所有电池中最低的阳极电位，被认为是最佳储能系统之一。然而，长期循环过程中的枝晶生长以及几乎相对无限的体积变化，常常导致严重的安全隐患和灾难性故障。在此，通过将锂熔体注入具有“亲锂”涂层的三维多孔碳基质中，开发出一种稳定的锂支架复合电极。锂均匀地截留在基质表面和三维结构中。所得复合电极在恒电流循环时具有高导电表面积和优异的结构稳定性。我们展示了该复合电极在3 mA/cm²的高电流密度下，经过80次循环，锂电镀/剥离过电位小（<90 mV）的稳定循环。
