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Quantitative Analysis of Patents Concerning Cathode Active Materials for Lithium-Ion Secondary Batteries Based on Layer Structure

층상구조기반의 리튬이차전지용 양극 활물질에 관한 특허정량분석

  • Kim, Byung-Nam (Center for Innovative Engineering Education, Dankook University) ;
  • Lim, Yong-Hwan (Department of Chemical Engineering, Dankook University) ;
  • Lee, Chul-Tae (Department of Chemical Engineering, Dankook University)
  • 김병남 (단국대학교 공학교육혁신센터) ;
  • 임용환 (단국대학교 화학공학과) ;
  • 이철태 (단국대학교 화학공학과)
  • Received : 2015.03.02
  • Accepted : 2015.05.04
  • Published : 2015.06.10

Abstract

This paper discusses quantitative analyses of patents published for cathode active materials for lithium secondary batteries based on layer structure. Numbers of the patents analyzed were 356, 1628, 2915, 439, and 611 for Korea, USA, Japan, Europe, and PCT (WO), respectively. Trends of improved technologies and alternative technologies concerning lithium cobalt, from 1991 to 2012 were examined and the patent shares distribution of each principal countries about lithium secondary battery technologies were also scrutinized. The number of patents for the mixed structure technology and next-generation lithium secondary battery technology increased numerously in 2000. Particularly in 2005, lots of patents were also published and SANYO (34.5%), SONY (17.5%), LG (7%), and SAMSUNG (5.5%) possessed leading patent applicants. Finally, the research focus on cathode active materials for lithium secondary batteries was confirmed by bubble chart distributions for component-by-step process.

Keywords

Lithium battery;Layer structure;Cathode material;Patent;Quantitative analysis

Acknowledgement

Grant : 지식재산·정보보호법 특화 전문인재양성 사업단

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Cited by

  1. Qualitative Analysis of Patents Concerning Cathode Active Materials for Lithium-Ion Secondary Batteries Based on Layer Structure vol.26, pp.3, 2015, https://doi.org/10.14478/ace.2015.1025