Layered lithium metal oxides free of localized cubic spinel-like structural phases and methods of making same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C01D-015/00
C01G-051/00
출원번호
US-0170180
(2002-06-12)
발명자
/ 주소
Gao,Yuan
Yakovleva,Marina
Wang,Hugh H.
Engel,John F.
출원인 / 주소
FMC Corporation
대리인 / 주소
Myers Bigel Sibley &
인용정보
피인용 횟수 :
2인용 특허 :
64
초록▼
The present invention includes substantially single-phase lithium metal oxide compounds having hexagonal layered crystal structures that are substantially free of localized cubic spinel-like structural phases. The lithium metal oxides of the invention have the formula Li αMβAγO2, wher
The present invention includes substantially single-phase lithium metal oxide compounds having hexagonal layered crystal structures that are substantially free of localized cubic spinel-like structural phases. The lithium metal oxides of the invention have the formula Li αMβAγO2, wherein M is one or more transition metals, A is one or more dopants having an average oxidation state N such that +2.5≦N≦+3.5, 0. 90≦α≦1.10, and β+γ=1. The present invention also includes dilithiated forms of these compounds, lithium and lithium-ion secondary batteries using these compounds as positive electrode materials, and methods of preparing these compounds.
대표청구항▼
That which is claimed: 1. A method of preparing a compound having a substantially single phase, hexagonal layered crystal structure, being substantially free of localized cubic spinel-like structural phases and having no diffraction peaks at a smalller scattering angle than the diffraction peak cor
That which is claimed: 1. A method of preparing a compound having a substantially single phase, hexagonal layered crystal structure, being substantially free of localized cubic spinel-like structural phases and having no diffraction peaks at a smalller scattering angle than the diffraction peak corresponding to Miller indices (003) in its powder x-ray diffraction pattern, the method comprising the steps of synthesizing a lithium metal oxide having the formula LiαMβ AγO2, wherein M is one or more transition metals, A is one or more dopants having an average oxidation state N such that +2. 5≦N≦+3.5, 0.90≦α ≦1.10, and β+γ=1, at a temperature of at least 600째 C.; and cooling the lithium metal oxide to room temperature at a rate of between 8째 C./min and 140째 C./min; wherein if M is Co in the lithium metal oxide, said synthesizing step comprises synthesizing the lithium metal oxide from a cobalt source compound selected from the group consisting of Co3O4 and Co(OH)2. 2. The method according to claim 1, wherein said cooling step comprises cooling the lithium metal oxide at a rate of greater than 10째 C. /min. 3. The method according to claim 1, wherein said cooling step comprises cooling the lithium metal oxide at a rate of between 10째 C./min and 100째 C./min. 4. The method according to claim 1, wherein said cooling step comprises uniformly cooling the lithium metal oxide. 5. The method according to claim 1, wherein said synthesizing step comprises synthesizing the lithium metal oxide from a lithium source compound selected from the group consisting of Li2CO3 and LiOH. 6. The method according to claim 1, wherein said synthesizing step comprises synthesizing the lithium metal oxide from Li2 CO3 and Co3O4. 7. The method according to claim 1, wherein said synthesizing step comprises synthesizing the lithium metal oxide at a temperature of at least about 800째 C. 8. The method according to claim 7, wherein said synthesizing step comprises synthesizing the lithium metal oxide from a lithium source compound selected from the group consisting of Li2CO3 and LiOH. 9. The method according to claim 7, wherein said synthesizing step comprises synthesizing the lithium metal oxide from Li2 CO3 and Co3 O4. 10. The method according to claim 1, wherein the lithium metal oxide, the ratio of the integrated intensity of the diffraction peak corresponding to Miller indices (110) to the integrated intensity of the diffraction peak corresponding to Miller indices ( 108) using powder x-ray diffraction is greater than or equal to 0.7. 11. The method according to claim 1, wherein in the lithium metal oxide, the ratio of the integrated intnsity of the diffraction peak corresponding to Miller indices (110) to the integrated intensity of the diffraction peak corresponding to Miller indices (108) using powder x-ray diffraction is greater than or equal to 0.8. 12. The method according to claim 1, wherein in the lithium metal oxide, the ratio of the integrated intensity of the diffraction peak corresponding to Miller indices (102) to the integrated intensity of the diffraction peak corresponding to Miller indices ( 006) using powder x-ray diffraction is greater than or equal to 1.0. 13. The method according to claim 1, wherein in the lithium metal oxide, the ratio of the integrated intensity of the diffraction peak corresponding to Miller indices (102) to the integrated intensity of the diffraction peak corresponding to Miller indices ( 006) using powdeer x-ray diffraction is greater than or equal to 1.2. 14. The method according to claim 1, wherein the lithium metal oxide has the formula LiCoO2. 15. The method according to claim 14, wherein in the lithium metal oxide, the intensity change from the peak at about g=12 to the valley at about g=3 using electron paramagnetic resonance is greater than 1 standard weak pitch unit. 16. The method according to claim 14, wherein in the lithium metal oxide, the intensity change from the pepak at about g=12 to the valley at about g=3 using electron paramagnetic resonance is greater than 2 standard weak pitch unit. 17. The method according to claim 1, wherein in the lithium metal oxide, the average oxidation state N of the dopants is about +3. 18. The method according to claim 1, wherein M is one or more transition metals selected from the group consisting of Co and Ni.
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