-
1.发明公开
公开(公告)号：EP2037515A1
公开(公告)日：2009-03-18
申请号：EP07737215.9
申请日：2007-05-25
CPC分类号： H01M4/587 , H01M4/0404 , H01M4/0409 , H01M4/043 , H01M4/133 , H01M4/1393 , H01M4/364 , H01M4/621 , H01M10/0525 , H01M2004/021 , H01M2004/027
摘要： A negative electrode active material for a lithium ion rechargeable battery having high electrode density, excellent in permeability of an electrolyte, less in capacity loss due to charging/discharging, and excellent in cycle performance is provided at a low cost. Further, there is provided a negative electrode for the lithium ion rechargeable battery, wherein the negative electrode active material as a mixture of three kinds of graphite powders, different in hardness and shape from one another, with a binder added thereto, is coated onto a metallic current collector to be dried and pressed, thereby rendering an electrode density not lower than 1.7g/cm 3 . In terms of relationship between press pressure P(kN), and electrode density D(g/cm 3 ), the negative electrode active material was composed of graphite powder A (D = 0.04 to 0.06P), graphite powder B (D=0.04 to 0.06P), and graphite powder C (D = 0.01 to 0.03P), and a mixing ratio by weight was A=30 to 60%, B=20 to 50%, and C=5 to 30%, respectively, whereupon it was found out that continuous voids sufficient to allow the electrolyte to permeate into the electrode were secured throughout the electrode, and deterioration in battery performance was not observed even after repeated expansion and contraction of particles accompanying storage · release of Li ions.
-
2.发明授权
公开(公告)号：EP2043182B1
公开(公告)日：2017-05-31
申请号：EP07766971.1
申请日：2007-07-06
IPC分类号： H01M4/58 , H01M4/02 , H01M4/36 , H01M10/0525 , H01M4/587
CPC分类号： H01M4/587 , H01M4/133 , H01M4/366 , H01M4/583 , H01M10/0525 , H01M2004/021 , H01M2004/027 , Y02E60/122 , Y02P70/54 , Y02T10/7011 , Y10T29/49115
-
3.发明授权NEGATIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION RECHARGEABLE BATTERY, AND NEGATIVE ELECTRODE 有权NEGATIVELEKTRODEN-AKTIVMATERIALFÜREINE WIEDERAUFLADBARE LITHIUMONENBATTERIE UND NEGATIVELEKTRODE
公开(公告)号：EP2037515B1
公开(公告)日：2011-07-13
申请号：EP07737215.9
申请日：2007-05-25
CPC分类号： H01M4/587 , H01M4/0404 , H01M4/0409 , H01M4/043 , H01M4/133 , H01M4/1393 , H01M4/364 , H01M4/621 , H01M10/0525 , H01M2004/021 , H01M2004/027
摘要： This invention provides a negative electrode active material for a lithium ion rechargeable battery, at low cost, which has a high electrode density, has excellent permeability to an electrolysis solution, has not significant loss in capacity by charging and discharging, and has good cycling properties. A binder is added to a negative electrode active material formed of a mixture of three graphite powders different from each other in hardness and shape, and the mixture is coated onto a metallic current collector, and the coated current collector is dried and pressed to prepare a negative electrode for a lithium ion rechargeable battery having an electrode density of not less than 1.7 g/cm3. The negative electrode active material comprises a graphite powder A (D = 0.04 to 0.06 P), a graphite powder B (D = 0.04 to 0.06 P), and a graphite powder C (D = 0.01 to 0.03 P), wherein P represents a press pressure, kN; and D represents an electrode density, g/cm3, the mixing weight ratio being A = 30 to 60%, B = 20 to 50%, and C = 5 to 30%. The negative electrode active material is advantageous in that voids which have been interconnected satisfactorily for permeation of the electrolysis solution into the electrode, can be ensured over the whole electrode, and the battery performance is not deteriorated even when expansion and shrinkage of particles are repeated upon storage and release of Li ions.
摘要翻译： 提供了一种用于锂离子可再充电电池的负极活性物质，其电极密度高，电解液的渗透性优异，由于充电/放电而导致的容量损失少，循环性能优异。 此外，提供了一种用于锂离子可再充电电池的负极，其中将作为彼此不同硬度和形状的三种石墨粉末的混合物的负极活性材料与其中添加有粘合剂的涂层涂覆在 金属集电体进行干燥和压制，从而使电极密度不低于1.7g / cm 3。 在压力P（kN）与电极密度D（g / cm 3）的关系方面，负极活性物质由石墨粉末A（D = 0.04〜0.06P），石墨粉末B（D = 0.04 至0.06P），石墨粉末C（D = 0.01〜0.03P），混合重量比分别为A = 30〜60％，B = 20〜50％，C = 5〜30％ 发现足以使电解质渗透到电极中的连续空隙被固定在整个电极中，即使在伴随存储·释放Li离子的颗粒的反复膨胀和收缩之后，仍未观察到电池性能的劣化。
-
4.发明公开
公开(公告)号：EP2043182A1
公开(公告)日：2009-04-01
申请号：EP07766971.1
申请日：2007-07-06
CPC分类号： H01M4/587 , H01M4/133 , H01M4/366 , H01M4/583 , H01M10/0525 , H01M2004/021 , H01M2004/027 , Y02E60/122 , Y02P70/54 , Y02T10/7011 , Y10T29/49115
摘要： There is provided a negative electrode for a lithium ion secondary battery high in discharge capacity per unit volume, small in capacity loss at the time of initial charge/discharge, and excellent in rapid charge/discharge characteristics.
Natural graphite, rendered spherical in shape, is mixed with carbon black, and pitch is added to a mixture thus formed to be thermally kneaded before baked at a temperature in a range of 900 to 1500°C, thereby obtaining graphite particles (A), each being substantially spherical in shape, and having fine protrusions on the surface thereof. Since the graphite particles (A) have the fine protrusions on the surface thereof, a multitude of electrically conducting networks are built in a complex way within an electrode, the graphite particles (A) can serve as a negative electrode material excellent in rapid charge/discharge characteristics, and power characteristics. The graphite particles (A) further baked at 3000°C to be graphitized are turned into graphite particles (B), each having similarly fine protrusions on the surface thereof. Further, carbonaceous particles (C) are also obtained by baking a mixture of pitch and carbon black in the range of 900 to 1500°C. By mixing those particles together as appropriate, it is possible to increase electrode density, thereby obtaining a lithium ion secondary battery having less deterioration in discharge capacity holding ratio, and excellent cycle characteristics. In accordance with Raman spectroscopic analysis using argon laser Raman scattering light, there exists a G-band composite peak comprising peaks in the vicinity of 1600cm -1 , and 1580cm -1 , respectively, and at least one peak in the vicinity of D-band at 1380cm -1 , an interlayer distance of the lattice plane d 002 , obtained by wide-range X-ray diffraction, being in the range of 0.335 to 0.337nm.
-
-
-
搜索结果
4 条记录 (耗时 0.011 秒)
