Abstract
Coal tar pitch-based coke power was heat-treated with B 2O 3 using an Acheson furnace. The heat-treated coke powder contained nitrogen and oxygen probably derived from BN and B 2O 3, respectively, and exhibited a large irreversible capacity in the first charge–discharge (lithium dope–undope) cycle. The large irreversible capacity was decreased not by the decomposition of BN or B 2O 3 but drastically by the increase of dissolved boron concentration. The discharge capacity also correlated well with the concentration of dissolved boron.
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