Hermetically sealed lithium-ion secondary electrochemical cell
First Claim
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1. A secondary electrochemical cell, which comprises:
- a) a casing;
b) a negative electrode comprising a negative electrode active material which intercalates with an alkali metal;
c) a positive electrode comprising a positive electrode active material which intercalates with the alkali metal, wherein the negative electrode and the positive electrode are electrochemically associated with each other housed in the casing, and wherein a periphery of the positive electrode is completely bounded by a periphery of the negative electrode to prevent alkali metal from plating as the cell is repeatedly cycled between a charged and a discharged condition; and
d) an electrolyte solution activating the negative and positive electrodes, wherein the electrolyte comprises about 45% ethylene carbonate, about 22% dimethyl carbonate, about 24.8% ethylmethyl carbonate and about 8.2% diethyl carbonate, by volume.
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Abstract
A rechargeable alkali metal electrochemical cell, and preferably a lithium-ion secondary cell, constructed of low magnetic susceptibility materials, is described. The non-magnetic characteristics enable the secondary cell to be used within the confines of a Magnetic Resonance Imaging system. The cell includes an electrolyte solution comprising ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate.
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Citations
27 Claims
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1. A secondary electrochemical cell, which comprises:
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a) a casing;
b) a negative electrode comprising a negative electrode active material which intercalates with an alkali metal;
c) a positive electrode comprising a positive electrode active material which intercalates with the alkali metal, wherein the negative electrode and the positive electrode are electrochemically associated with each other housed in the casing, and wherein a periphery of the positive electrode is completely bounded by a periphery of the negative electrode to prevent alkali metal from plating as the cell is repeatedly cycled between a charged and a discharged condition; and
d) an electrolyte solution activating the negative and positive electrodes, wherein the electrolyte comprises about 45% ethylene carbonate, about 22% dimethyl carbonate, about 24.8% ethylmethyl carbonate and about 8.2% diethyl carbonate, by volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An electrochemical cell, which comprises:
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a) a casing of a material having a magnetic susceptibility of at least about 182×
106, or greater;
b) a negative electrode which intercalates with lithium;
c) a positive electrode comprising a lithiated electrode active material, wherein the negative electrode and the positive electrode are electrochemically associated with each other housed in the casing; and
d) an electrolyte solution activating the negative and the positive electrodes, the electrolyte including a lithium metal salt dissolved in a quaternary, nonaqueous carbonate solvent mixture consisting of about 45% ethylene carbonate, 22% dimethyl carbonate, about 24.8% ethylmethyl carbonate and about 8.2% diethyl carbonate, by volume. - View Dependent Claims (16)
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17. A method for providing a secondary electrochemical cell, comprising the steps of:
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e) providing a casing of a material having a magnetic susceptibility of at least about 182×
106, or greater;
f) providing a negative electrode which intercalates with an alkali metal;
g) providing a positive electrode comprising a positive electrode active material which intercalates with the alkali metal;
h) housing the negative and the positive electrodes inside the casing electrochemically associated with each other and wherein a periphery of the positive electrode is completely bounded by a periphery of the negative electrode to prevent alkali metal from plating as the cell is repeatedly cycled between a charged and a discharged condition; and
i) activating the negative and positive electrodes with an electrolyte comprising about 45% ethylene carbonate, about 22% dimethyl carbonate, about 24.8% ethylmethyl carbonate and about 8.2% diethyl carbonate, by volume. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification