公开(公告)号：US06455199B1

公开(公告)日：2002-09-24

申请号：US09214825

申请日：1999-02-22

Applicant: Masaki Kitagawa ,  Yoshihiro Kashihara ,  Hizuru Koshina ,  Toyoji Sugimoto ,  Kunio Tsuruta ,  Shuji Ito ,  Hajime Nishino ,  Kojiro Ishikawa ,  Hisanori Sugimoto ,  Kaoru Tsukamoto

Inventor： Masaki Kitagawa ,  Yoshihiro Kashihara ,  Hizuru Koshina ,  Toyoji Sugimoto ,  Kunio Tsuruta ,  Shuji Ito ,  Hajime Nishino ,  Kojiro Ishikawa ,  Hisanori Sugimoto ,  Kaoru Tsukamoto

IPC: C01B3104

CPC classification number: H01M4/587 ,  H01M4/133 ,  H01M10/0525 ,  H01M2004/021 ,  Y10T29/49108

Abstract: Graphite powder for a negative electrode in prior arts, which allows lithium ions to repeat intercalation and deintercalation reversibly by charge and discharge, has failed to attain a specific capacity close to the theoretical capacity of 372 mAh per 1 g. Also, there was a problem in storage property at a high temperature when it is attempted to improve the high rate charge and discharge characteristics. An object of the present invention is to solve these problems. In the process of pulverizing flaky graphite particles of which plane interval (d002) of (002) plane is 3.350 to 3.360 angstroms, and crystallite size (Lc) in the C-axis direction is at least 1000 angstroms or more, the graphite particles are chamfered into disk- or tablet-like form, which are then sifted, so as to obtain a graphite powder, of which mean particle size is defined within the range of 10 to 30 microns, mean thickness of thinnest portion is defined to be 3 to 9 microns, and X-ray diffraction peak intensity ratio of (110)/(004) by a wide angle X-ray diffraction method is defined to be 0.015 or more. By using this powder, the conventional problems are solved in a favorable balance, and, while achieving high energy density, the high rate discharge performance and reliability when left at a high temperature can be enhanced.

Abstract translation: 现有技术中的允许锂离子通过充电和放电可逆地重复嵌入和脱嵌的现有技术的石墨粉未能达到接近每1g的372mAh的理论容量的比容量。 此外，当尝试提高高速率充放电特性时，在高温下的储存特性存在问题。 本发明的目的是解决这些问题。 在（002）面的平面间隔（d002）为3.350〜3.360埃的片状石墨粒子粉碎的过程中，C轴方向的微晶尺寸（Lc）为1000以上，石墨粒子为 倒角成片状或片状，然后将其筛分，以获得石墨粉末，其平均粒度定义在10至30微米的范围内，最薄部分的平均厚度定义为3至 通过广角X射线衍射法将（110）/（004）的X射线衍射峰强度比定义为0.015以上。 通过使用这种粉末，常规问题得到平衡的解决，并且在实现高能量密度的同时，可以提高高放电性能和高温时的可靠性。

公开(公告)号：US20060046146A1

公开(公告)日：2006-03-02

申请号：US11208788

申请日：2005-08-23

Applicant: Nobuhiro Tsuji ,  Hisanori Sugimoto

Inventor： Nobuhiro Tsuji ,  Hisanori Sugimoto

IPC: H01M4/62 ,  H01M4/50 ,  C01B31/04

CPC classification number: H01M4/625 ,  C01B32/20 ,  C01P2004/61 ,  C01P2006/11 ,  C01P2006/12 ,  H01M4/06 ,  H01M4/50

Abstract: There is provided a new type of non-expanded graphite powder by peeling off a lamination plane within non-expanded graphite particles, which is useful as a conductive carbon material in a positive electrode mix for an alkaline manganese battery. The alkaline manganese battery has an excellent discharge property when the above non-expanded graphite powder are used as the conductive carbon material.

Abstract translation: 通过在非膨胀石墨颗粒内剥离层压平面来提供新型的非膨胀石墨粉末，其可用作碱性锰电池正极混合物中的导电碳材料。 当使用上述非膨胀石墨粉末作为导电碳材料时，碱锰电池具有优异的放电性能。