| 摘要 |
A composition comprising a plurality of elongate elements and a plurality of particles is provided for use in a lithium ion battery. The elongate elements and particles each comprise a metal or semi-metal selected from one or more of the group comprising silicon, tin, germanium and aluminium or mixtures thereof, but most preferably silicon. The composition may include additional ingredients such as a binder, a conductive material and a further electro-active material, such as graphite. The elongate elements may be in the form of threads, tubes, ribbons or flakes. Both the elongate elements and particles may be coated. Options include elongate elements and/or particles with a core comprising silicon, with a silicon containing coating surrounding a non-silicon core, or with a core comprising a first type of silicon and a coating comprising a second type of silicon. The compositions can be used for the fabrication of electrodes, preferably anodes, in the manufacture of lithium ion batteries and optionally batteries based on magnesium ions or sodium ions. The composition is able to intercalate and release lithium during the charging and discharging cycles respectively of a battery into which it has been incorporated. Methods of fabricating the composition and electrodes including the composition are claimed, as well as electrodes thus prepared and devices including such electrodes. |
