| abstract |
Lithium ion electrochemical cells have been described that have a high charge / discharge capacity, long lifetime, and reduced first cycle irreversible capacity. This advantage is achieved by adding at least one sulfate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture comprising ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. Preferred additives are selected from silyl sulphate, tin sulphate or organic sulphate. |