Over-lithiated cathode material
AssigneeGM Global Technology Operations LLC
InventorsMary E. Fortier, Bing Tan, Li Yang, Umamaheswari Viswanathan, Vijay P. Saharan, Sherman H. Zeng
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Abstract
The present disclosure relates to over-lithiated positive electroactive materials for use within an electrochemical cell. For example, the electrochemical cell includes a positive electrode that includes an over-lithiated positive electroactive material that includes one of LixMn2O4 (where 1.05≤x≤1.30) and LiMn(2−x)NixO4 (where 0≤x≤0.5). The electrochemical cell can include a negative electrode that includes a silicon-containing negative electroactive material having a Columbic Efficiency greater than or equal to about 80% and less than or equal to about 90%.
Claims11
An electrochemical cell that cycles lithium ions, wherein the electrochemical cell comprises:
- a positive electrode comprising an over-lithiated positive electroactive material comprising LixMn2O4 (where 1.20≤x≤1.30) and having a Columbic Efficiency greater than or equal to about 80% to less than or equal to about 82%;
- a negative electrode comprising a silicon-containing negative electroactive material comprising one of blended silicon-graphite and blended silicon oxide-graphite and having a Columbic Efficiency greater than or equal to about 80% to less than or equal to about 90%;
- and
- an electrolyte disposed between the negative electrode and the positive electrode.
An electrochemical cell that cycles lithium ions, wherein the electrochemical cell comprises:
- a positive electrode comprising an over-lithiated positive electroactive material comprising one of LixMn2O4 (where 1.20≤x≤1.30) and having a Columbic Efficiency greater than or equal to about 80% to less than or equal to about 82%;
- a negative electrode comprising a silicon-containing electroactive material comprising one of blended silicon-graphite and blended silicon oxide-graphite;
- and
- an electrolyte disposed between the negative electrode and the positive electrode.
An electrochemical cell that cycles lithium ions, wherein the electrochemical cell comprises:
- a positive electrode comprising an over-lithiated positive electroactive material comprising LixMn2O4, where 1.20≤x≤1.30 and having a first Columbic efficiency greater than or equal to about 80% to less than or equal to about 82%;
- a negative electrode comprising a silicon-containing electroactive material comprising one of a blended silicon-graphite and a blended silicon-oxide graphite and having a second Columbic Efficiency, wherein the first and second Columbic Efficiencies are the same;
- and
- an electrolyte disposed between the negative electrode and the positive electrode.
Dependencies are inferred from the claim text.