The Effect of Boron Substitution in Carbon on the Intercalation of Lithium in Li x  (  B  z  C 1 − z  ) 6

Boron‐substituted carbons, , have been produced by chemical vapor deposition from benzene and boron trichloride precursors at 900°C. The voltage and reversible capacity of cells were measured for the range of boron concentrations . These cells show an increase in voltage for a given lithium concentration compared to that in a cell with a pure carbon anode (i.e., petroleum coke, graphite, etc.). In addition, all cells for showed greater reversible capacities than Li/coke cells, and for the capacities exceeded that of graphite. For example, for the reversible specific capacity was 437 mAh/g. This behavior is understood by treating boron as an electron acceptor in the carbon lattice. These materials appear to be promising candidates for anodes in lithium ion rechargeable batteries.