Lithium-containing phosphates, method of preparation, and uses thereof
AssigneeValence Technology, Inc.
InventorsJeremy Barker, M. Yazid Saidi
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Abstract
The invention provides an electrochemical cell which comprises a first electrode and a second electrode which is a counter electrode to said first electrode. The first electrode comprises a phosphorous compound of the nominal general formula Li3E′aE″b(PO4)3, desirably at least one E is a metal; and preferably, Li3M′M″(PO4)3. E′ and E″ are the same or different from one another. Where E′ and E″ are the same, they are preferably metals having more than one oxidation state. Where E′ and E″ are different from one another, they are preferably selected from the group of metals where at least one of E′ and E″ has more than one oxidation state.
Claims22
An electrode, comprising a compound of the nominal general formula
- LiaE′bE″c(PO4)3,
- wherein a is about 3;
- band c are both greater than 0, and b plus c is about 2;
- E′ is Fe;
- E″ is an element selected from the group consisting of non-transition metals;
- and wherein at least one of E′ and E″ is capable of an oxidation state higher than that initially present in the compound.
An electrode, comprising a compound of the nominal general formula
- Li3E′2−yE″y(PO4)3,
- wherein 0<y<2;
- E′ is Fe;
- E″ is an element selected from the group consisting of non-transition metals;
- and wherein at least one of E′ and E″ is capable of an oxidation state higher than that initially present in the compound.
An electrochemical cell, comprising:
- a first electrode comprising a compound of the nominal general formula
- LiaE′bE″c(PO4)3,
- wherein in an initial condition a is about 3, and 0<a<3 when the electrochemical cell undergoes cycling;
- b and c are both greater than 0, and b plus c is about 2;
- E′ is Fe;
- E″ is selected from the group consisting of non-transition metals;
- and wherein at least one of E′ and E″ is an element capable of an oxidation state higher than that initially present in the compound;
- the electrochemical cell further comprising a second electrode which is a counter electrode to the first electrode;
- and
- an electrolyte.
An electrochemical cell, comprising:
- a first electrode comprising a compound of the nominal general formula
- Li3−xE′2−yE″y(PO4)3,
- wherein in an initial condition x=0, and 0<x≦3 when the electrochemical cell undergoes cycling;
- 0<y<2;
- E′ is Fe;
- E″ is selected from the group consisting of non-transition metals;
- and wherein at least one of E′ and E″ is an element capable of an oxidation state higher than that initially present in the compound;
- the electrochemical cell further comprising a second electrode which is a counter electrode to the first electrode;
- and
- an electrolyte.
Dependencies are inferred from the claim text.