• Japanese
  • Chinese
Cover Image

Li Secondary Battery Key Patent Analysis : Separator Coating and Surface Treatment


Notice: The original report is written in Korean. Please ask us for more information regarding delivery time.



Drawing attention as one of main components of EVs as well as small batteries for IT devices and also aiming at the ESS market as well

This report is intended to provide information about patent trends on "separator coating and surface modification" among technologies for secondary battery separators to related companies and research institutes.

Polyolefin-based separators are the most widely used commercial separators. However, the demand for high capacity and output batteries are gradually increasing, which brings about increasing concern about battery safety. In terms of battery safety, polyolefin-based separators, which show severe thermal contraction at high temperature and physical vulnerability, cause a lot of problems. High temperature storage and overcharge of batteries are highly related to thermal stability of separators, and battery safety issues caused by nail penetration and impurities are related to the mechanical properties of separators.

Meanwhile, the issue of wettability with electrolytes is getting serious, as batteries become bigger. In addition, the demand for low-cost batteries is also increasing, as application to electric vehicles is on the track. Considering that separators account for a large portion of the production cost of EV batteries, there is urgent need to solve this problem as well as other technical issues. Thus, there has recently been active effort to solve a lot of problems of existing polyolefin-based separators. This report covers patents on surface modification of separators, which are being developed to improve ceramic composite technologies and affinity with electrolytes.

Among patents that have been filed in Korea, the United States, Japan, and Europe from January 1, 1990 to June 30, 2012, total 1,185 patents were selected, from which 218 effective patents were extracted. Those patents were classified into two categories, coating and surface modification, and then sub-divided into inorganic matters, polymers, and composites for analysis.


In particular, this report on separator patent analysis provides in-depth research and survey of patent disputes over separators between companies.

Strong Points of the report

  • Specialized patent analysis on separator coating and surface modification for lithium secondary batteries
  • In-depth analysis of patent disputes
  • General and in-depth analysis of key patents
  • Analysis of summaries of key patents
  • An list of effective patents (Excel file)
  • (*You can get a discount on this file by purchasing the report)

Table of Contents

1. Introduction

  • 1.1 Background and purpose
    • 1.1.1 Background
    • 1.1.2 Purpose
  • 1.2 Scope of analysis
  • 1.3 Analysis criteria
    • 1.3.1 Technology classification
    • 1.3.2 Search Method
    • 1.3.3 Analysis Method
      • Method of Patent Trend Analysis
      • In-depth Analysis Method

2. Patent Trend Analysis

  • 2.1 Overall Patent Trend
    • 2.1.1 Patenting rate and trend of each country by year
    • 2.1.2 Patent rate and trend by year (division)
    • 2.1.3 Patent rate and trend by year (section)
      • Patent rate and trend on film coating technologies (section)
      • Patent rate and trend on surface modification technologies ( section)
    • 2.1.4 Patent rate of each country by technology type
    • Patent rate by technology type (USA)
    • Patent rate by technology type (Japan)
    • Patent rate by technology type (Korea)
    • Patent rate by technology type (Europe)
  • 2.2 Analysis of major applicants
    • 2.2.1 Major patent applications worldwide
    • 2.2.2 Major applicants by technology type
      • Patent rate of film coating technologies by applicant
      • Patent rate of surface modification technologies by applicant
      • Major applicant rankings by section
    • 2.2.3 Major applicant rankings by country
  • 2.3 Patent trend by major applicant
    • 2.3.1 Overall patenting trend of major applicants by year
    • 2.3.2 Technology focus area of major applicants
      • Technology focus area of major applicants (USA)
      • Technology focus area of major applicants (Japan)
      • Technology focus area of major applicants (Korea)
      • Technology focus area of major applicants (Europe)
    • 2.3.3 Index analysis of U.S. patents (issued) by major applicants

3. In-depth analysis

  • 3.1 In-depth analysis by major applicant
  • 3.2 Technology development trend analysis
    • 3.2.1 Selection of major patents by technology type
    • 3.2.2 Technology progress chart by technology type
    • 3.2.3 Technology progress chart by major company
  • 3.3 Analysis of major inventors
    • 3.3.1 Selection of major inventors
    • 3.3.2 Analysis table of major inventors
  • 3.4 Analysis of disputes at home and abroad
    • 3.4.1 Selection of major companies
    • 3.4.2 Current status of disputes between major companies in USA
    • 3.4.3 Current status of disputes between major companies in Korea
      • Disputes between Korean and foreign companies in Korea
      • Disputes between Korean companies in Korea
        • Screening history of patents at issue
        • Analysis of scope of rights of patents at issue
        • Screening history of U.S. patents based on patents at issue
        • Analysis of scope of rights of U.S. patents at issue based on patents at issue
        • Forecast of patent disputes

4. Conclusion

  • 4.1 Patent trend analysis: conclusions and implications
  • 4.2 In-depth analysis: Conclusion and implications of

Appendix 1. A list of summaries of major patents selected in Technology Development Trend Analysis

Show More
  • Int'l: +1-860-674-8796
  • TollFree(US): +1-866-353-3335
  • Europe: +32-2-535-7543
  • Asia: +65-6223-2436
Back to Top