Lithium titanate cell
AssigneeAltairnano, Inc.
InventorsMike Coleman, Veselin Manev
Life of this patent
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Abstract
The embodiment relates to the field of electrolyte selection in lithium ion cells which may employ Li4Ti5O12 compounds as negative electrode material and LiPF6 as the ionic salt component in the cell electrolyte solution. The embodiment further relates to improvements in lithium ion cell performance as a result of selection of specific formulation of electrolyte for lithium ion cells.
Claims14
An electrolyte for a lithium ion battery with a Li4Ti5O12 compound as a negative electrode and a LiNi0.33Co0.33Mn0.33O2 compound as a positive electrode comprising a solvent consisting of ethylene carbonate and ethylmethyl carbonate and a lithium salt consisting of LiPF6 wherein the LiPF6 concentration exceeds the LiPF6 concentration corresponding to maximum electrolyte ionic conductivity and an electrolyte additive to suppress the decomposition of the solvent wherein the additive is selected from the group consisting of 1,3-propane sultone or succinic anhydride or a combination of 1,3-propane sultone and succinic anhydride.
A lithium ion cell comprising at least Li4Ti5O12 compound as a negative electrode and a LiNi0.33Co0.33Mn0.33O2 compound as positive electrode, a separator and a non-aqueous electrolyte comprising a lithium salt consisting of a LiPF6 salt dissolved in a solvent consisting of a mixture of ethylene carbonate and ethyl methyl carbonate and electrolyte additives to suppress the decomposition of the solvent wherein the concentration of the said LiPF6 salt exceeds the LiPF6 concentration corresponding to maximum electrolyte ionic conductivity and an additive and wherein the additive is selected from the group consisting of 1,3-propane sultone or succinic anhydride or a combination of 1,3-propane sultone and succinic anhydride.
An electrolyte for a lithium ion battery with a Li4Ti5O12 compound as a negative electrode and a LiNi0.33Co0.33Mn0.33O2 compound as a positive electrode consisting essentially of ethylene carbonate, ethylmethyl carbonate, LiPF6 salt in a concentration which exceeds the LiPF6 concentration corresponding to maximum electrolyte ionic conductivity, 1,3-propane sultone and succinic anhydride.
Dependencies are inferred from the claim text.