High energy electrochemical cell employing solid-state anode
First Claim
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1. A high rate secondary electrochemical cell comprising:
- an anode comprising a reversible lithium intercalation compound selected from one or more transition metal chalcogenides having a relatively high lithium intercalation ability and a relatively low molecular weight and having the general formula;
space="preserve" listing-type="equation">Li.sub.x M.sub.a X.sub.b,where M is selected from transition metal(s);
X is selected from O, S, Se, and Te; and
where x, a and b are numbers representing relative combining ratios and wherein the intercalation compound has properties including a potential of no more than 1.5 V versus a lithium reference electrode and >
200 mAh/gm intercalation/deintercalation capacity (<
133 gm/Faraday);
a compatible cathode having a cathode active material and a current collector; and
an electrolyte system.
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Abstract
Improved anodes having active materials consisting substantially of one or more lithium insertion compounds further consisting of transition metal chalcogenides or oxides capable of reversibly intercalating lithium ions are disclosed. Cells utilizing these anodes are also disclosed.
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Citations
18 Claims
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1. A high rate secondary electrochemical cell comprising:
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an anode comprising a reversible lithium intercalation compound selected from one or more transition metal chalcogenides having a relatively high lithium intercalation ability and a relatively low molecular weight and having the general formula;
space="preserve" listing-type="equation">Li.sub.x M.sub.a X.sub.b,where M is selected from transition metal(s);
X is selected from O, S, Se, and Te; andwhere x, a and b are numbers representing relative combining ratios and wherein the intercalation compound has properties including a potential of no more than 1.5 V versus a lithium reference electrode and >
200 mAh/gm intercalation/deintercalation capacity (<
133 gm/Faraday);a compatible cathode having a cathode active material and a current collector; and
an electrolyte system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-aqueous electrochemical cell comprising:
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an anode comprising a first reversible lithium intercalation compound or mixtures thereof selected from transition metal chalcogenides having a relatively high lithium intercalation ability and a relatively low molecular weight and having the general formula;
space="preserve" listing-type="equation">Li.sub.x M.sub.a X.sub.b,where M is selected from transition metal(s);
X is selected from O, S, Se, and Te;where x, a and b are numbers representing relative combining ratios and wherein the intercalation compound has properties including a potential of no more than 1.5 V versus a lithium reference electrode and >
200 mAh/gm intercalation/deintercalation capacity (<
133 gm/Faraday);a cathode having a cathode active material comprising a second reversible lithium intercalation compound compatible with that of the anode; and
a non-aqueous electrolyte system. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A non-aqueous electrochemical cell comprising:
an anode comprising a first reversible lithium intercalation compound or mixtures thereof selected from transition metal chalcogenides having a relatively high lithium intercalation ability and a relatively low molecular weight and having the general formula;
space="preserve" listing-type="equation">Li.sub.x Ti.sub.a O.sub.b,where 0.5≦
x ≦
2a=1 b=1.5≦
b≦
3 andwherein the intercalation compound has properties including a potential of no more than 1.5 V versus a lithium reference electrode and >
200 mAh/gm intercalation/deintercalation capacity (<
133 gm/Faraday);a cathode having a cathode active material comprising a second reversible lithium intercalation compound compatible with that of the anode; and a non-aqueous electrolyte system. - View Dependent Claims (17, 18)
Specification