Inorganic materials for use in a lithium-ion secondary battery
A cell for use in an electrochemical cell, such as a lithium-ion secondary battery that includes a positive electrode with an active material that acts as a cathode and a current collector; a negative electrode with an active material that acts as an anode and a current collector; a non-aqueous electrolyte; and a separator placed between the positive and negative electrodes. At least one of the cathode, the anode, the electrolyte, and the separator includes an inorganic additive in the form of one or more zeolites having a Si:AI ratio ranging from 2-50 that absorbs one or more of moisture, free transition metal ions, or hydrogen fluoride that become present in the cell. One or more of the cells may be combined in a housing to form a lithium-ion secondary battery. The inorganic additive may also be incorporated as a coating applied to the internal wall of the housing.
1 . A cell for use in a lithium-ion secondary battery, the cell comprising:
a positive electrode, the positive electrode comprising an active material as a cathode for the cell and a current collector that is in contact with the cathode; wherein lithium ions flow from the cathode to an anode when the cell is charging;
a negative electrode, the negative electrode comprising an active material as the anode for the cell and a current collector that is in contact with the anode; wherein lithium ions flow from the anode to the cathode when the cell is discharging;
a non-aqueous electrolyte positioned between and in contact with both the negative electrode and the positive electrode; wherein the non-aqueous electrolyte supports the reversible flow of lithium ions between the positive electrode and the negative electrode; and
a separator placed between the positive electrode and negative electrode, such that the separator separates the anode and a portion of the non-aqueous electrolyte from the cathode and the remaining portion of the non-aqueous electrolyte; wherein the separator is permeable to the reversible flow of lithium ions there through;
wherein at least one of the non-aqueous electrolyte and the separator includes an inorganic additive that absorbs moisture, free transition metal ions, and hydrogen fluoride (HF) that become present in the cell; the inorganic additive being one or more types of a zeolite having a zeolite framework of CHA, CHI, FAU, LTA or LAU with a silicon (Si) to aluminum (Al) ratio ranging from about 2 to about 50; the inorganic additive having a surface area that is in the range of about 10 m 2 /g to about 1000 m 2 /g, a pore volume in the range of 0.1-2.00 cc/g, as well as a sodium concentration that ranges from 0.1 wt. % to about 1.0 wt. % and a lithium concentration that ranges from 2.5 wt. % to 10 wt. % based on the overall weight of the inorganic additive;
wherein the cell has a loss in discharge capacity after 100 cycles of C/2 charge-and-discharge at 25° C. of about 0.5%.
2 . The cell according to claim 1 , wherein the inorganic additive is dispersed within at least a portion of at least one of the positive electrode, the negative electrode, the non-aqueous electrolyte, and the separator or is in the form of a coating applied onto a portion of a surface of the negative electrode, the positive electrode, or the separator.
3 . The cell according to claim 1 , wherein the inorganic additive comprises particles having a morphology that is plate-like, cubic, spherical, or a combination thereof.
4 . The cell according to claim 1 , wherein the inorganic additive comprises particles having a particle size (D 50 ) that is in the range of about 0.05 micrometers (μm) to about 5 micrometers (μm).
5 . The cell according to claim 1 , wherein the inorganic additive includes one or more doping elements selecting from K, Mg, Cu, Ni, Zn, Fe, Ce, Sm, Y, Cr, Eu, Er, Ga, Zr, and Ti.
6 . The cell according to claim 1 , wherein the positive electrode comprises a lithium transition metal oxide or a lithium transition metal phosphate;
the negative electrode comprises graphite, a lithium titanium oxide, silicon metal, or lithium metal;
the separator is a polymeric membrane; and
the non-aqueous electrolyte is a solution of a lithium salt dispersed in an organic solvent.
7 . A lithium-ion secondary battery comprising:
one or more secondary cells; and
one or more housings, such that an internal wall from one of the one or more housings encapsulates at least one or more of the secondary cells;
wherein each of the one or more secondary cells comprises:
a positive electrode, the positive electrode comprising an active material as a cathode for the cell and a current collector that is in contact with the cathode;
wherein lithium ions flow from the cathode to an anode when the cell is charging;
a negative electrode, the negative electrode comprising an active material as the anode for the cell and a current collector that is in contact with the anode; wherein lithium ions flow from the anode to the cathode when the cell is discharging;
a non-aqueous electrolyte positioned between and in contact with both the negative electrode and the positive electrode; wherein the non-aqueous electrolyte supports the reversible flow of lithium ions between the positive electrode and the negative electrode; and
a separator placed between the positive electrode and negative electrode, such that the separator separates the anode and a portion of the non-aqueous electrolyte from the cathode and the remaining portion of the non-aqueous electrolyte; wherein the separator is permeable to the reversible flow of lithium ions there through;
wherein at least one of the non-aqueous electrolyte, the separator, and the internal wall of the housing includes an inorganic additive that absorbs moisture, free transition metal ions, and hydrogen fluoride (HF) that become present in the cell; the inorganic additive being one or more types of a zeolite having a zeolite framework of CHA, CHI, FAU, LTA or LAU with a silicon (Si) to aluminum (Al) ratio ranging from about 2 to about 50; the inorganic additive having a surface area that is in the range of about 10 m 2 /g to about 1000 m 2 /g, a pore volume in the range of 0.1-2.00 cc/g, as well as a sodium concentration that ranges from 0.1 wt. % to about 1.0 wt. % and a lithium concentration that ranges from 2.5 wt. % to 10 wt. % based on the overall weight of the inorganic additive;
wherein the one or more secondary cells has a loss in discharge capacity after 100 cycles of C/2 charge-and-discharge at 25° C. of about 0.5%.
8 . The battery according to claim 7 , wherein the inorganic additive is dispersed within least a portion of at least one of the positive electrode, the negative electrode, the non-aqueous electrolyte, and the separator or is in the form of a coating applied onto a portion of a surface of the negative electrode, the positive electrode, the separator; or the internal wall of the housing.
9 . The battery according to claim 7 , wherein the inorganic additive comprises particles having a morphology that is plate-like, cubic, spherical, or a combination thereof.
10 . The battery according to claim 7 , wherein the inorganic additive comprises particles having a particle size (D 50 ) that is in the range of about 0.05 micrometers (μm) to about 5 micrometers (μm).
11 . The battery according to claim 7 , wherein the inorganic additive includes one or more doping elements selecting from K, Mg, Cu, Ni, Zn, Fe, Ce, Sm, Y, Cr, Eu, Er, Ga, Zr, and Ti.
12 . The battery according to claim 7 , wherein the positive electrode comprises a lithium transition metal oxide or a lithium transition metal phosphate;
the negative electrode comprises graphite, a lithium titanium oxide, silicon metal, or lithium metal;
the separator is a polymeric membrane; and
the non-aqueous electrolyte is a solution of a lithium salt dispersed in an organic solution.