Fast-charging high-energy lithium-ion batteries via implantation of amorphous silicon nanolayer in edge-plane activated graphite anodes

As fast-charging lithium-ion batteries turn into increasingly important components in forthcoming applications, various strategies have been devoted to the development of high-rate anodes. However, despite vigorous efforts, the low initial Coulombic efficiency and poor volumetric energy density with insufficient electrode conditions remain critical challenges that have to be addressed. Herein, we demonstrate a hybrid anode via incorporation of a uniformly implanted amorphous silicon nanolayer and edge-site-activated graphite. This architecture succeeds in improving lithium ion transport and minimizing initial capacity losses even with increase in energy density. As a result, the hybrid anode exhibits an exceptional initial Coulombic efficiency (93.8%) and predominant fast-charging behavior with industrial electrode conditions. As a result, a full-cell demonstrates a higher energy density (>= 1060 Wh l(-1)) without any trace of lithium plating at a harsh charging current density (10.2 mA cm(-2)) and 1.5 times faster charging than that of conventional graphite

Drastic modification of graphene oxide properties by incorporation of nickel: a simple inorganic chemistry approach

Strong increase in electrical conductivity of graphene oxide (GO) (I a parts per thousand 10(-9) A) is found by addition of Ni nanoparticles (Ni-NPs) preliminarily solved by HCl (Ni-sol) (I a parts per thousand 10(-4) A) or powder (Ni-pow) obtained from this solution (I a parts per thousand 10(-6) A), while simply mixing GO with Ni-NPs an insulator similar to pure GO is obtained. Thus, Ni-sol and Ni-pow can be used to transform GO from insulator to semiconductor. One of the transformation mechanisms is Ni as spillover. At the same time, different kinds of the magnetic response are obtained on GO and reduced GO (rGO) samples with and without Ni. Weak paramagnetic response is detected in pure GO. Stronger paramagnetic behavior is observed for GO and rGO mixed with Ni-sol or Ni-pow. Pure rGO sample shows weak ferromagnetism represented by slim but visible hysteresis with remnant magnetization M (r) of 0.05 emu/g. GO with Ni-NPs presents clear hysteresis with M (r) of 2.8 emu/g, while sample prepared by addition of Ni-NPs to rGO presents the largest hysteresis with M (r) as high as 11.8 emu/g. Thus, the optimal procedure to obtain the magnetic response requested for particular application can be chosen