Putting Kevlar® MicroCore™

to the test

 
 
 

Kevlar® MicroCore™ did not burn nor generate smoke

during high-temperature exposure >200°C

 
 
 
 
 
 

 Test details

  • Test method: Yamagata University test method
  • Test protocol: Discharged battery was placed in an oven, exposed to elevated
  • temperatures (increasing at 5°C/minute) and voltage was measured.
  • Test cell construction:
    - Battery capacity: 2Ah
    - Cathode: NCM523
    - Anode: Graphite
    - Electrolyte: 1M LiPF6 ED:DEC (1:1 vol%) + 1 wt% VC
      

*Independent researchers at Yamagata University in Japan conducted this test on NIPPON KODOSHI CORPORATION (NKK) TopNove™ made with DuPont™ Kevlar® MicroCore™.Test results may vary depending on the cell chemistry and construction.

 
 
 
Ceramic coated microporous film sample with no flames or smoke visible

NKK’s TopNove™ made with DuPont™ Kevlar® MicroCore™ sample at the end of the test. No flame or smoke observed.

Ceramic coated microporous film sample that has shrunk after heat exposure

Ceramic coated microporous film sample started generating smoke at 242°C.

Kevlar® MicroCore™ —

Did not burn at >200°C

 
 
 

Unlike other materials currently used in battery separators, Kevlar® MicroCore™ does not shrink under high temperature up to 300℃ and helps improve the battery safety when exposed to high temperatures. 

 
 
 

Kevlar® MicroCore™ doesn’t shrink—even at temperatures up to 300°C

 
 
 
Ceramic coated microporous film sample that has shrunk after heat exposure

Ceramic coated microporous film at 150°C.

Kevlar® MicroCore™ showing no signs of shrinkage after heat exposure

Kevlar® MicroCore™ at 300°C. No shrinkage.

 Test details

  • Test method: Yamagata University test method
  • Test protocol: Separator sample was held between plates and placed in oven at temperatures of 150°C and 300°C for 12 hours. Visual inspection was conducted after high-temperature exposure.

*Independent researchers at Yamagata University in Japan conducted this test on NIPPON KODOSHI CORPORATION (NKK) TopNove™ made with DuPont™ Kevlar® MicroCore™.  Test results may vary depending on the cell chemistry and construction.

 
 
 

Kevlar® MicroCore™ —

excellent wettability

 
 
 

Features excellent wettability, allowing use of a safer electrolyte with higher viscosity, which is difficult to use with incumbent microporous separators.

Test details

  • Test method: NIPPON KODOSHI CORPORATION (NKK) test method
  • Test protocol: 50 µL of propylene carbonate (PC) was dropped on each separator
    material and a visual observation was made.

 

 
 
 

Kevlar® MicroCore™ features excellent

ionic conductivity

 
 
 
 
 
 

 
 
 
 
 
 

 
 
 

 Test details

  •   Test method: Yamagata University test method
  •   Test protocol: Direct current resistance (DCR) was measured at state of charge (SOC)
       of 20%, 50% and 80%.
  •    Test cell construction:
       -   Battery capacity: 45mAh
       -   Cathode: NCM523
       -   Anode: Graphite
       -   Electrolyte: 1M LiPF6 ED:DEC (1:1 vol%) + 1 wt% VC

*Independent researchers at Yamagata University in Japan conducted this test on NIPPON KODOSHI CORPORATION (NKK) TopNove™ made with DuPont™ Kevlar® MicroCore™. Test results may vary depending on the cell chemistry and construction.

 

 
 
 

Kevlar® MicroCore™ demonstrates high

capacity retention

 
 
 
 
 
 

 
 
 

 Test details

  •   Test method: Yamagata University test method
  •   Test protocol: Stored battery at 60°C and measured discharge capacity over time.
  •   Test cell construction:
        -   Battery capacity: 1Ah
        -   Cathode: NCM523
        -   Anode: Graphite
        -   Electrolyte: 1M LiPF6 ED:DEC (1:1 vol%) + 1 wt% VC

*Independent researchers at Yamagata University in Japan conducted this test on NIPPON KODOSHI CORPORATION (NKK) TopNove™ made with DuPont™ Kevlar® MicroCore™. Test results may vary depending on the cell chemistry and construction.

 

 
 
 
 
 
 
 
 
 

Explore battery testing and learn more about

Kevlar® MicroCore™