公开(公告)号：US20160141626A1

公开(公告)日：2016-05-19

申请号：US14897554

申请日：2014-06-11

Applicant: TDK CORPORATION

Inventor： Nobuyuki HOSAKA ,  Yasuhiro IKEDA ,  Kazumasa TANAKA ,  Atsushi SANO

IPC: H01M4/62 ,  H01M10/0525 ,  H01M4/38 ,  H01M4/134 ,  H01M4/48

CPC classification number: H01M4/622 ,  H01M4/134 ,  H01M4/386 ,  H01M4/48 ,  H01M4/485 ,  H01M10/0525 ,  H01M2004/027 ,  Y02T10/7011

Abstract: A negative electrode for a lithium ion secondary battery, which has high energy density and which can suppress a crease (form change) of a negative electrode active material layer and a negative electrode current collector caused by the expansion and contraction occurring along with the quick charging and discharging and also suppress the falloff of the negative electrode active material layer after the quick charging and discharging cycle, and a lithium ion secondary battery using the negative electrode. The negative electrode for a lithium ion secondary battery and the lithium ion secondary battery include: a negative electrode active material including 5% or more of silicon or silicon oxide; a binder that is polyacrylate whose carboxylic groups at terminals of side chains of polyacrylic acid are cross-linked with magnesium or alkaline earth metal; and a negative electrode current collector.

Abstract translation: 一种锂离子二次电池用负极，其能量密度高，能够抑制随着快速充电而发生的膨胀和收缩引起的负极活性物质层和负极集电体的折痕（变形） 并且在快速充放电循环之后放电并抑制负极活性物质层的衰减，以及使用负极的锂离子二次电池。 锂离子二次电池用负极和锂离子二次电池包括：含有5％以上的硅或氧化硅的负极活性物质; 聚丙烯酸酯的粘合剂，其聚丙烯酸侧链末端的羧基与镁或碱土金属交联; 和负极集电体。

公开(公告)号：US20150125744A1

公开(公告)日：2015-05-07

申请号：US14535390

申请日：2014-11-07

Applicant: TDK CORPORATION

Inventor： Nobuyuki HOSAKA ,  Atsushi SANO

IPC: H01M4/62 ,  H01M4/134 ,  H01M4/13

CPC classification number: H01M4/386 ,  H01M4/366 ,  H01M4/485 ,  H01M4/622 ,  H01M10/0525

Abstract: An object of the present invention is to provide a negative electrode for a lithium ion secondary battery with the excellent high-temperature cycle characteristic, and a lithium ion secondary battery including the same. In the negative electrode active material for a lithium ion secondary battery according to the present invention, a surface of a negative electrode active material including silicon or silicon oxide is coated with a polymer compound, and the polymer compound includes a polyacrylic acid derivative whose carboxyl groups at ends of side chains are cross-linked with a divalent metal cation (Mg2+, Ca2+, Sr2+, Ba2+, Co2+, Ni2+, Cu2+, or Zn2+).

Abstract translation: 本发明的目的是提供一种具有优异的高温循环特性的锂离子二次电池用负极和包含该负极的锂离子二次电池。 在本发明的锂离子二次电池用负极活性物质中，包含硅或氧化硅的负极活性物质的表面被高分子化合物覆盖，高分子化合物包含聚酰胺酸衍生物，其羧基 在侧链末端与二价金属阳离子（Mg2 +，Ca2 +，Sr2 +，Ba2 +，Co2 +，Ni2 +，Cu2 +或Zn2 +）交联。