에버켐텍

Advanced energy material

Overview of current collector primer

Role

• Creates a high-conductive attachment layer between current collector and active material
• Improves attachability and interfacial resistance between current collector and active material

Existing product composition

• Conductive material : Carbon black
• Binder : Maintains attachability with the current collector
• Additives : Ensures dispersion of conductive material and improves coatability, etc.

Targeted property of current collector primer

• • The primer thickness can be reduced by using high-conductive carbon complex conductive material, and interfacial resistance, peel strength, and battery performance.

  
  

  Assessment item	Unit	Leading Company		Desired property
  		Positive electrode	Negative electrode	Positive electrode	Negative electrode
  Primer layer thickness	µm	1	1	0.7	0.7
  Interfacial resistance	Ω/□	30	25	25	21
  Peel strength	N/m	20	23	23	26
  Rate capability	%	90	88	92	90
  Secondary battery cell lifespan	%	90	90	92	92

Negative electrode conductive material of EVERCHEMTECH

EVERCHEMTECH’s goal of developing SWCNT conductive material

• 
  

  Performance indicator		Unit	Leading Company	Development goal
  SWCNT Dispersion solution	Solid content of SWCNT dispersion solution	wt%	1.2	1.5
  	Viscosity of SWCNT dispersion	CPS	15,000	< 10,000
  	Storage stability of SWCNT dispersion solution	Instability index	-	6 months < 0.1
  	Interfacial resistance of SWCNT dispersion solution	Ω.cm	300	< 100

EVERCHEMTECH’s development of carbon complex conductive material

Combined conductive materials in line, face and plane forms to enable electric interaction with an active material on a wide area Inhibiting the volume expansion of negative electrode active material of Si unit

Contact area between the active material and conductive material ↑ Conductive material volume ↓Energy density ↓