| abstract |
Electrical energy storage device ( 22 ) comprising an anode ( 24 ), a cathode ( 26 ) and electrolyte ( 28 ), whereby the anode ( 24 ) comprises particles ( 10, 20, 30, 40 ) comprising an amorphous and/or crystalline silicon-based core ( 12 ), a continuous or non-continuous first carbon-containing shell ( 14, 14 a ), and a continuous or non-continuous second carbon-containing shell ( 16, 16 a ). The second carbon-containing shell ( 16, 16 a ) has a higher density and/or a higher atomic percentage of carbon than the first carbon-containing shell ( 14, 16 a ). |