Lithium-ion secondary battery and manufacturing method thereof
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-004/13
H01M-004/58
H01M-004/62
H01M-004/80
출원번호
US-0398638
(2006-04-06)
등록번호
US-8465874
(2013-06-18)
우선권정보
JP-2005-110521 (2005-04-07)
발명자
/ 주소
Nishimura, Naoto
Nishijima, Motoaki
Kobayashi, Shinsuke
출원인 / 주소
Sharp Kabushiki Kaisha
대리인 / 주소
Nixon & Vanderhye P.C.
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
In a lithium-ion secondary battery of the present invention, the electrical resistivity of the mixture of a positive electrode active material, an electrically conductive member, and a binder is 0.1 Ωcm or more but 1 Ωcm or less. The positive and negative electrodes each have an electrical capacity
In a lithium-ion secondary battery of the present invention, the electrical resistivity of the mixture of a positive electrode active material, an electrically conductive member, and a binder is 0.1 Ωcm or more but 1 Ωcm or less. The positive and negative electrodes each have an electrical capacity of 10 mAh or more but 50 mAh or less per volume of a rectangular parallelepiped that has a 1 cm2 square base on a face of the electrode of one polarity facing the electrode of the other polarity and that has a height equal to the thickness of the electrode of the one polarity at the square base. Used as the negative electrode thereof is a negative electrode formed by sintering graphite powder, non-graphitizing carbon, and fibrous powder retained in the pores of a porous metal structure in an inert gas atmosphere at a temperature of between 600 and 1000° C.
대표청구항▼
1. A lithium-ion secondary battery having a battery capacity of 5 Ah or more, the lithium-ion secondary battery comprising: a positive electrode comprising a positive electrode active material, a first electrically conductive member, a first binder, and a first charge collecting member;a negative el
1. A lithium-ion secondary battery having a battery capacity of 5 Ah or more, the lithium-ion secondary battery comprising: a positive electrode comprising a positive electrode active material, a first electrically conductive member, a first binder, and a first charge collecting member;a negative electrode comprising a negative electrode active material, a second electrically conductive member, a second binder, and a second charge collecting member; andan electrolyte containing an electrolytic salt,whereinan electrical resistivity of a mixture of the positive electrode active material, the first electrically conductive member, and the first binder is 0.1 Ωcm or more but 1 Ωcm or less,the positive and negative electrodes each have an electrical capacity of 10 mAh or more but 50 mAh or less per volume of a rectangular parallelepiped that has a 1 cm2 square base on a face of the electrode of one polarity facing the electrode of the other polarity and that has a height equal to a thickness of the electrode of the one polarity at the square base,a capacity ratio of the negative electrode to the positive electrode is 1 or more but 1.5 or less, andthe negative electrode is formed by sintering negative electrode ingredients including graphite powder, non-graphitizing carbon, and fibrous powder in pores of a porous metal structure used as the second charge collecting member. 2. The lithium-ion secondary battery of claim 1, wherein a porosity of the porous metal structure is 75% or more but 98% or less. 3. The lithium-ion secondary battery of claim 1, wherein the porous metal structure is formed of a material selected from the group consisting of iron, cobalt, nickel, and an alloy thereof. 4. The lithium-ion secondary battery of claim 3, wherein the porous metal structure is nickel foam. 5. The lithium-ion secondary battery of claim 1, wherein the non-graphitizing carbon is a carboxymethylcellulose polymer or a polymer of carboxymethylcellulose derivative. 6. The lithium-ion secondary battery of claim 1, wherein the fibrous powder is powder of highly graphitized carbon fiber. 7. The lithium-ion secondary battery of claim 1, wherein a fiber diameter of the fibrous powder is between 0.1 and 80 μm. 8. The lithium-ion secondary battery of claim 1, wherein the graphite powder exhibits, when subjected to wide-angle X-ray diffractometry, an average interplanar spacing of (002) plane of between 0.335 and 0.340 nm, a crystallite thickness in (002) plane direction of 10 nm or more, and a crystallite thickness in (110) plane direction of 10 nm or more. 9. The lithium-ion secondary battery of claim 1, wherein a particle size of the graphite powder is not more than 80 μm. 10. The lithium-ion secondary battery of claim 1, wherein a sintering temperature of the negative electrode is between 600 and 1000° C. 11. The lithium-ion secondary battery of claim 1, wherein the graphite has an R value of 0.4 or less. 12. A lithium-ion secondary battery having a battery capacity of 5 Ah or more, the lithium-ion secondary battery comprising: a positive electrode comprising a positive electrode active material, a first electrically conductive member, a first binder, and a first charge collecting member;a negative electrode comprising a negative electrode active material, a second electrically conductive member, a second binder, and a second charge collecting member; andan electrolyte containing an electrolytic salt,whereinan electrical resistivity of a mixture of the positive electrode active material, the first electrically conductive member, and the first binder is 0.1 Ωcm or more but 1 Ωcm or less,the positive and negative electrodes each have an electrical capacity of 10 mAh or more but 50 mAh or less per volume of a rectangular parallelepiped that has a 1 cm2 square base on a face of the electrode of one polarity facing the electrode of the other polarity and that has a height equal to a thickness of the electrode of the one polarity at the square base,a capacity ratio of the negative electrode to the positive electrode is 1 or more but 1.5 or less, andthe negative electrode is formed by sintering negative electrode ingredients including graphite powder, non-graphitizing carbon, and fibrous powder in pores of a porous metal structure used as the second charge collecting member and wherein the graphite has an R value of 0. 13. The lithium-ion secondary battery of claim 12, wherein a porosity of the porous metal structure is 75% or more but 98% or less. 14. The lithium-ion secondary battery of claim 12, wherein the porous metal structure is formed of a material selected from the group consisting of iron, cobalt, nickel, and an alloy thereof. 15. The lithium-ion secondary battery of claim 14, wherein the porous metal structure is nickel foam. 16. The lithium-ion secondary battery of claim 12, wherein the non-graphitizing carbon is a carboxymethylcellulose polymer or a polymer of carboxymethylcellulose derivative. 17. The lithium-ion secondary battery of claim 12, wherein the fibrous powder is powder of highly graphitized carbon fiber. 18. The lithium-ion secondary battery of claim 12, wherein a fiber diameter of the fibrous powder is between 0.1 and 80 μm. 19. The lithium-ion secondary battery of claim 12, wherein the graphite powder exhibits, when subjected to wide-angle X-ray diffractometry, an average interplanar spacing of (002) plane of between 0.335 and 0.340 nm, a crystallite thickness in (002) plane direction of 10 nm or more, and a crystallite thickness in (110) plane direction of 10 nm or more. 20. The lithium-ion secondary battery of claim 12, wherein a particle size of the graphite powder is not more than 80 μm. 21. The lithium-ion secondary battery of claim 12, wherein a sintering temperature of the negative electrode is between 600 and 1000° C.
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