Search International and National Patent Collections

1. (WO2017034093) ULTRA-HIGH OUTPUT, ULTRA-LONG-LIFESPAN LITHIUM SECONDARY BATTERY NEGATIVE ELECTRODE MATERIAL USING LAYERED STRUCTURE OF POROUS GRAPHENE AND METAL OXIDE NANOPARTICLES, AND METHOD FOR PREPARING SAME

Pub. No.:    WO/2017/034093    International Application No.:    PCT/KR2015/013551
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Sat Dec 12 00:59:59 CET 2015
IPC: H01M 4/36
H01M 4/587
H01M 4/62
H01M 4/133
H01M 10/052
Applicants: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
한국과학기술원
Inventors: KANG, Jeung Ku
강정구
LEE, Gyu Heon
이규헌
LEE, Jung Woo
이정우
KIM, Sang Jun
김상준
Title: ULTRA-HIGH OUTPUT, ULTRA-LONG-LIFESPAN LITHIUM SECONDARY BATTERY NEGATIVE ELECTRODE MATERIAL USING LAYERED STRUCTURE OF POROUS GRAPHENE AND METAL OXIDE NANOPARTICLES, AND METHOD FOR PREPARING SAME
Abstract:
The present invention provides a lithium secondary battery negative electrode material which uses a layered structure of porous graphene and metal oxide nanoparticles, and exhibits extremely fast charge-discharge properties and long lifespan properties, wherein macropores in the porous graphene and the short diffusion length of the metal oxide nanoparticles allow rapid movement and diffusion of lithium ions. It was announced for the first time that highly electrically conductive porous graphene having low sheet resistance (of about 4.53 Ω·sq-1) is directly connected with a current collector in the absence of conducting agents and adhesives to form an electron passageway, and metal oxide nanocrystals having open passages function as fast ion-transport paths on the surface of graphene network structures. In addition to extremely high speed charge-discharge behavior, the present invention exhibits an unprecedented lifespan performance of 10,000 or more cycles, even under a current density condition of 30,000 mA·g-1. Thus, in combination with negative electrode nanostructures in porous graphene network structures, the present invention may be widely utilized in various fields of application as a high-capacity structure that achieves extremely fast charge-discharge speed properties and stable lifespan properties.