公开(公告)号：US06277522B1

公开(公告)日：2001-08-21

申请号：US09011781

申请日：1999-05-03

申请人： Atsuo Omaru ,  Naoyuki Nakajima ,  Masayuki Nagamine

发明人： Atsuo Omaru ,  Naoyuki Nakajima ,  Masayuki Nagamine

IPC分类号： H01M458

CPC分类号： D01F11/12 ,  D01F9/15 ,  H01M4/0433 ,  H01M4/133 ,  H01M4/587 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/022 ,  H01M2300/004

摘要： Carbon fiber having cross sectional shape which satisfies area replenishment rate of 0.8 or more is used as anode material for non-aqueous electrolyte secondary battery. Alternatively, since value of fractal dimension of cross section high order structure of the random radial type carbon fiber can be utilized as material parameter for evaluating the cross sectional structure, carbon fiber in which the value of the fractal dimension is caused to fall within the range from 1.1 to 1.8 and the crystallinity has been controlled such that it falls within reasonable range is used as anode material for non-aqueous electrolyte secondary battery. Further, carbon fiber having cross section high order structure such that the central portion is radial type structure and the surface layer portion is random radial type structure is used as anode material for non-aqueous electrolyte secondary battery. Furthermore, it is also effective to use carbon fiber having notch structure at the cross section. In addition, graphitized carbon fiber having cross sectional portions different in the crystal structure at predetermined periods in the fiber length direction is made up. By crushing the graphitized carbon fiber thus obtained, carbon fiber crushed powder having less unevenness and predetermined aspect ratio can be easily made up.

摘要翻译： 作为非水电解质二次电池的负极材料，使用满足0.8以上的区域补充率的截面形状的碳纤维。 或者，由于可以利用随机径向型碳纤维的横截面高阶结构的分形尺寸的值作为用于评价截面结构的材料参数，其中使分形维数的值落在范围内的碳纤维 1.1〜1.8，结晶度控制在合理范围内，用作非水电解质二次电池的负极材料。 此外，作为非水电解质二次电池的负极材料，使用具有横截面高阶结构的碳纤维，使得中心部分是径向型结构，表层部分是随机径向型结构。 此外，在截面上使用具有凹口结构的碳纤维也是有效的。 此外，在纤维长度方向上，在规定时间内，形成具有晶体结构不同的截面部分的石墨化碳纤维。 通过粉碎由此获得的石墨化碳纤维，可以容易地制成具有较小不均匀性和预定纵横比的碳纤维粉碎粉末。

公开(公告)号：US5932373A

公开(公告)日：1999-08-03

申请号：US828644

申请日：1997-03-31

申请人： Masayuki Nagamine ,  Atsuo Omaru ,  Naoyuki Nakajima

发明人： Masayuki Nagamine ,  Atsuo Omaru ,  Naoyuki Nakajima

IPC分类号： C01B31/02 ,  C01B31/04 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/58 ,  H01M4/587 ,  H01M10/05 ,  H01M10/0525 ,  H01M10/0566 ,  H01M10/36 ,  H01M4/36

CPC分类号： H01M4/587 ,  C01B31/04 ,  H01M10/0525 ,  H01M4/133 ,  C01P2002/60 ,  C01P2002/78 ,  C01P2004/61 ,  H01M4/131 ,  H01M4/1393

摘要： A material for a negative electrode of a cell, which is prepared according to a process of the present invention, can provides a cell having a high true specific gravity, a high charging capacity and an excellent cycle characteristic. The process of the present invention comprises the steps of carbonizing an organic compound to form a carbide thereof, pulverizing said carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering said powder of the carbide at a temperature of 2,000.degree. C. or higher to produce a graphite. In addition, in accordance with the present invention, there is also provided non-aqueous electrolyte secondary cell comprising a negative electrode, which is prepared by carbonizing an organic compound to form a carbide thereof, pulverizing the carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering the powder of the carbide at a temperature of 2,000.degree. C. to form a graphite.

摘要翻译： 根据本发明的方法制备的用于电池负极的材料可以提供具有高真比重，高充电能力和优异的循环特性的电池。 本发明的方法包括以下步骤：将有机化合物碳化以形成其碳化物，粉碎所述碳化物以形成平均粒径为10μm至2mm的粉末，并将碳化物的粉末在温度 为2000℃以上，生成石墨。 此外，根据本发明，还提供了包含负极的非水电解质二次电池，其通过碳化有机化合物以形成其碳化物制备，粉碎碳化物以形成具有平均颗粒的粉末 尺寸为10微米至2mm，并在2000℃的温度下烧结碳化物粉末以形成石墨。

公开(公告)号：US5667914A

公开(公告)日：1997-09-16

申请号：US647755

申请日：1996-05-15

申请人： Masayuki Nagamine ,  Atsuo Omaru ,  Naoyuki Nakajima

发明人： Masayuki Nagamine ,  Atsuo Omaru ,  Naoyuki Nakajima

IPC分类号： C01B31/02 ,  C01B31/04 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/58 ,  H01M4/587 ,  H01M10/05 ,  H01M10/0525 ,  H01M10/0566 ,  H01M10/36 ,  H01M10/40

CPC分类号： H01M4/587 ,  C01B31/04 ,  H01M10/0525 ,  H01M4/133 ,  C01P2002/60 ,  C01P2002/78 ,  C01P2004/61 ,  H01M4/131 ,  H01M4/1393

摘要： A material for a negative electrode of a cell, which is prepared according to a process of the present invention, can provides a cell having a high true specific gravity, a high charging capacity and an excellent cycle characteristic. The process of the present invention comprises the steps of carbonizing an organic compound to form a carbide thereof, pulverizing said carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering said powder of the carbide at a temperature of 2,000.degree. C. or higher to produce a graphite. In addition, in accordance with the present invention, there is also provided non-aqueous electrolyte secondary cell comprising a negative electrode, which is prepared by carbonizing an organic compound to form a carbide thereof, pulverizing the carbide to form a powder having an average particle size of 10 .mu.m to 2 mm, and sintering the powder of the carbide at a temperature of 2,000.degree. C. to form a graphite.

摘要翻译： 根据本发明的方法制备的用于电池负极的材料可以提供具有高真比重，高充电能力和优异的循环特性的电池。 本发明的方法包括以下步骤：将有机化合物碳化以形成其碳化物，粉碎所述碳化物以形成平均粒径为10μm至2mm的粉末，并将碳化物的粉末在温度 为2000℃以上，生成石墨。 此外，根据本发明，还提供了包含负极的非水电解质二次电池，其通过碳化有机化合物以形成其碳化物制备，粉碎碳化物以形成具有平均颗粒的粉末 尺寸为10微米至2mm，并在2000℃的温度下烧结碳化物粉末以形成石墨。

公开(公告)号：US5451477A

公开(公告)日：1995-09-19

申请号：US254062

申请日：1994-06-03

申请人： Atsuo Omaru ,  Masayuki Nagamine ,  Naoyuki Nakajima

发明人： Atsuo Omaru ,  Masayuki Nagamine ,  Naoyuki Nakajima

IPC分类号： H01M4/58 ,  H01M4/02

CPC分类号： H01M4/583

摘要： A non-aqueous liquid electrolyte secondary battery including an anode formed of a carbon material capable of doping and de-doping of lithium, a cathode formed of a lithium-containing transition metal composite oxide and a non-aqueous liquid electrolyte is disclosed. The carbon material for the anode contains graphite and a non-graphitic carbon material formed of at least a non-graphitizable carbon material or a graphitizable carbon material. The non-graphitic carbon material preferably exhibits a discharge capacity per gram 80% or more of that of the graphite, measured in the first cycle of intermittent charging and discharging. The non-graphitic carbon material exhibits a ratio of a discharge capacity up to 0.3 V to a discharge capacity up to 1.5 V which is not smaller than 0.5, measured in the first cycle of intermittent charging and discharging with a standard of a lithium potential. Specifically, the graphite has a true density of 2.1 g/cm.sup.3 or greater, an interplanar distance of (002) of less than 0.340 nm found by X-ray diffraction, and a C-axis crystallite size of the (002) plane of 14.0 nm or greater. The non-graphitic carbon material has a true density of 1.70 g/cm.sup.3 or smaller, an interplanar distance of (002) plane of 0.37 nm or greater, and no exothermic peak observed at temperatures not lower than 700.degree. C. in differential thermal analysis in an air stream. The non-aqueous liquid electrolyte is a liquid electrolyte formed by dissolving an electrolyte into a non-aqueous solvent containing ethylene carbonate.

摘要翻译： 公开了一种非水电解液二次电池，其包括由能够掺杂和脱掺杂锂的碳材料形成的阳极，由含锂过渡金属复合氧化物形成的阴极和非水电解液。 用于阳极的碳材料包含由至少不可石墨化碳材料或可石墨化碳材料形成的石墨和非石墨碳材料。 非石墨碳材料优选在间歇充放电的第一循环中测量的每克碳石墨的放电容量为80％以上。 非石墨碳材料在以电位为标准的间歇充放电的第一次循环中测得，其放电容量高达0.3V，放电容量达1.5V以下，不大于0.5。 具体地，石墨的真密度为2.1g / cm 3以上，通过X射线衍射求得的（002）面积小于0.340nm的面间距离，（002）面的C轴微晶尺寸为14.0 nm以上。 非石墨碳材料的真密度为1.70g / cm 3以下，（002）面的面间距离为0.37nm以上，差热分析中在700℃以上观察不到放热峰 在空气流中。 非水电解液是通过将电解质溶解在含有碳酸亚乙酯的非水溶剂中形成的液体电解质。