Copper-manganese mixed oxide cathode material for use in alkaline cells having high capacity
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-004/50
H01M-004/00
H01M-002/14
출원번호
UP-0843930
(2007-08-23)
등록번호
US-7807296
(2010-10-26)
발명자
/ 주소
Vu, Viet H.
Ndzebet, Ernest
Kumar, Akshaya
Gilbert, Deborah
Bushong, William C.
Ramaswami, Karthik
Scherer, Juergen
출원인 / 주소
Roval, Inc.
대리인 / 주소
Armstrong Teasdale LLP
인용정보
피인용 횟수 :
3인용 특허 :
3
초록▼
The present invention relates to a copper-manganese mixed oxide cathode material, which is suitable for use in a cathode of an electrochemical cell, and which has the formula MnxCuyOz.nH2O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about
The present invention relates to a copper-manganese mixed oxide cathode material, which is suitable for use in a cathode of an electrochemical cell, and which has the formula MnxCuyOz.nH2O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about +2 and about +7, x is equal to about 3-y, y is less than about 3, z is calculated or experimentally determined, using means known in the art, based on the values of x and y, as well as the oxidation states of Mn and Cu, and nH2O represents the surface and structural water present in the mixed oxide material. The present invention further relates to an electrochemical cell comprising the noted cathode material.
대표청구항▼
What is claimed is: 1. A copper-manganese mixed oxide cathode active material having the formula MnxCuyOz.nH2O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about +2 and about +7, x is equal to about 3-y, y is less than about 3, z is calcu
What is claimed is: 1. A copper-manganese mixed oxide cathode active material having the formula MnxCuyOz.nH2O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about +2 and about +7, x is equal to about 3-y, y is less than about 3, z is calculated or experimentally determined based on the values of x and y, as well as the oxidation states of Mn and Cu, nH2O is the structural water molecules present in the mixed oxide cathode material, and n has a value between about 0.1 and about 10, wherein the discharge capacity of the mixed oxide cathode material at 1.1 V vs. a zinc wire reference electrode in a half-cell discharge test at 5 mA is at least about 50 mAh/gm. 2. The cathode material of claim 1 wherein Cu has an oxidation state between about +1 and about +2. 3. The cathode material of claim 1, wherein Mn has an oxidation state between about +2 and about +4. 4. The cathode material of claim 1, wherein y is between about 0.01 and 2.99. 5. The cathode material of claim 1, wherein x is between about 0.01 and 2.99. 6. The cathode material of claim 1, wherein z is between about 2.25 and about 7.5. 7. The cathode material of claim 1, wherein the copper-manganese mixed oxide has a defect spinel-type structure. 8. The cathode material of claim 1, wherein z is between about 2.25 and less than 4.0. 9. The cathode material of claim 1, wherein z is between greater than 4.0 and about 7.5. 10. The cathode material of claim 1, wherein Cu has an oxidation state between about +1 and about +3 and Mn has an oxidation state between about +2 and about +4. 11. The cathode material of claim 1, wherein Cu has an oxidation state of about +2 and Mn has an oxidation state between about +3 and about +4. 12. The cathode material of claim 1, wherein Cu has an oxidation state of about +2 and Mn has an oxidation state of about +4. 13. The cathode material of claim 1, wherein said material has the formula: Cu1.5Mn1.5Oz.nH2O wherein y, x, z and n are as defined in claim 1. 14. A primary electrochemical cell comprising: an anode; a cathode comprising a copper-manganese mixed oxide cathode active material having the formula MnxCuyOz.nH2O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about +2 and about +7, x is equal to about 3-y, y is less than about 3, z is calculated or experimentally determined based on the values of x and y, as well as the oxidation states of Mn and Cu,nH2O is the structural water molecules present in the mixed oxide cathode material, and n has a value between about 0.1 and about 10; a separator disposed between the anode and the cathode; and, an electrolyte which is in fluid communication with the anode, the cathode, and the separator. 15. The electrochemical cell of claim 14, wherein said separator comprises about 1 to less than 3 wraps of a free-standing polymer film, said film having a dry thickness of less than about 250 microns. 16. The electrochemical cell of claim 15, wherein said separator has a resistivity of less than about 100 ohm-cm. 17. The electrochemical cell of claim 14, wherein said separator comprises particles of a clay additive. 18. The electrochemical cell of claim 14, wherein said separator comprises a metal sulfide additive. 19. The electrochemical cell of claim 14, wherein the discharge capacity at 1.1 V vs. a zinc wire reference electrode in a half-cell discharge test at 5 mA is at least about 50 mAh/gm. 20. The electrochemical cell of claim 14, wherein Cu has an oxidation state between about +1 and about +2. 21. The electrochemical cell of claim 14, wherein Mn has an oxidation state between about +2 and about +4. 22. The electrochemical cell of claim 14, wherein y is between about 0.01 and 2.99. 23. The electrochemical cell of claim 14, wherein x is between about 0.01 and 2.99. 24. The electrochemical cell of claim 14, wherein z is between about 2.25 and about 7.5. 25. The electrochemical cell of claim 14, wherein the copper-manganese mixed oxide has a defect spinel-type structure. 26. The electrochemical cell of claim 14, wherein z is between about 2.25 and less than 4.0. 27. The electrochemical cell of claim 14, wherein Cu has an oxidation state between about +1 and about +3 and Mn has an oxidation state between about +2 and about +4. 28. The electrochemical cell of claim 14, wherein Cu has an oxidation state of about +2 and Mn has an oxidation state between about +3 and about +4. 29. The electrochemical cell of claim 14, wherein Cu has an oxidation state of about +2 and Mn has an oxidation state of about +4. 30. The electrochemical cell of claim 14, wherein said material has the formula: Cu1.5Mn1.5Oz.nH2O wherein y, x, z and n are as defined in claim 14.
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