Innovative nanosize lithium storage alloys with silica as active centre

The Electrochemistry of Amorphous Si-B Thin Film Electrodes in Li Cells

“…All the voltage curves are characteristic of sputtered pure Si films, having an initial flat first discharge plateau and two pairs of sloping plateaus during the subsequent lithiation and delithiation process. [25][26] No plateau related to Li 15 Si 4 is present during these initial cycles, which is consistent with Si films where Li 15 Si 4 formation can be suppressed by the stress between the Si film and the substrate. 27 With increasing B concentration, both sloping plateaus shorten gradually so that the reversible capacity of Si 1-x B x electrode decreases.…”

“…29 Considering that the voltage shift has been associated with how strongly the inactive phase bonds to the active Si-phase, 16 this may be indicative that the Si-phase in Si-B alloys is bonded relatively weakly to the inactive B phase. A weakly bonded Si active phase has been shown to result in Li 15 Si 4 formation and fade during cycling in thin films. 27 We will explore the longer-term cycling implications of this potentially weak interaction in a later publication using Si-B made by mechanical milling.…”

Silicon Based Composite Anode for Lithium Ion Battery

“…(Park, 2005(Park, , 2006 obtained an alloy through arc-melting followed by high energy mechanical milling (HEMM) which consisted inactive phases NiSi 2 , NiSi and an active Si phases which delivered a reversible capacity of ~ 800 mAh g -1 . (Wang et al 2000) showed that the NiSi/C nano-composite to perform better than Fe-Si nano-composite and found both electrodes exhibited capacity decline with cycling.…”

Effect of Silicon Content over Fe-Cu-Si/C Based Composite Anode for Lithium Ion Battery

“…The practical application of these materials has been hampered as they exhibit wide volume variations, 328% for Li-Si and 258% for Li-Sn during discharge/charge processes which leads the electrodes to undergo internal cracks and morphological changes resulting in loss of electrical contact and cell failure. 2 In order to identify a suitable anode material with high electrochemical characteristics intermetallic silicide alloys with less active or inactive metal elements with two metals, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] carbon coated silicon 21,22 and alloys consisting of multicomponents 23,27 were explored mostly with ductile graphite. In this paper two different composites constituting of Fe, Cu and Si, with different silicon contents have been considered.…”