Battery field

Binders for lithium ion batteries

Extending battery life

The electrode of lithium ion battery is generally made by mixing the active material, conductive auxiliary agent or binder with the solvent, and applying the solution to the electrode. Binder is used for binding active material to active material, conductive auxiliary agent or collector. We have the CLPA series which is crosslinking polyacrylic acid binder in our lineup.

This binder has been developed for use with high capacity Si type anodes. Si type is the emerging anode technology for next generation lithium ion rechargeable batteries. CLPA inhibits the collapse of the negative Si electrode that is caused by the repeated volume change during charge/discharge.

Performance of CLPA on Si and graphite composite electrode

Binder covers over the active material and firmly binds Si to the graphite.

Si活物質での作用イメージ

CLPA-W11

  • It is suitable for Si system anode.
  • It is crosslinking polyacrylic acid, partially neutralized composition and 10% solution.
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Properties

Appearance Form: 10% solution
Color: transparent ~ slightly light brown
Solubility Water: soluble
Storage Room temperature

CLPA-W11: Si system half-cell data

Testing conditions

Electrolyte 1M LiPF6 EC/DMC(1:1 volume ratio) with 2(v/v)% FEC.
Cell 2032 formed coin cell , counter Li foil.
Anode Si：AB; CLPA-W11＝70:15:15(solid contents ratio)
Anode loading 1.5mg/cm2
Charge/Discharge conditions Charging：0.2C, CC, up to 1200mAh/g
Discharging：0.2C, CC, 2.0V cutoff
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■CLPA-W11　■CMC-SBR
CLPA-W11 has higher battery performance than that of CMC-SBR.

Related laws and regulations

TSCA Listed
EINECS Not Listed
REACH Not Listed

CLPA-C07

  • It is suitable for composite anode composed of graphite and SiO system.
  • It is a crosslinking copolymerized polymer composed of acrylic acid and hydrophobic monomer, and 10% solution.
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Properties

Properties Form: 10% solution
Color: transparent ~ slightly light brown
Solubility Water: soluble
Storage Refrigeration

CLPA-C07: SiO system full-cell data

Testing conditions

Electrolysis 1M LiPF6 EC/DMC(1:1 volume ratio) + VC 1wt%, FEC 1wt%
Cell pouch (35 mAh)
Cathode NCA : AB: PVDF =93 : 3 : 4
Anode SiOC : Graphite : KB : CLPA-C07=32.5 : 56 : 3 : 8.5
Anode loading 3.5mg/cm2
Charge and discharge condition 1st：Charge：0.1C, CCCV, 4.2V, 16h cut off　Discharge：0.1C, CC, 2.5V cutoff
2nd ～4th：Charge : 0.2C, CCCV 4.2V, 8h cut off　Discharge : 0.2C, CC, 2.5V cutoff
after 5th：Charge : 0.5C, CCCV 4.2V, 3h cut off　Discharge : 0.5C, CC, 2.5V cutoff

Testing temperature； 25 ℃

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CLPA-C07: Charge/Discharge efficiency and AC impedance at the 1st cycle

Testing conditions

Anode Active materials (SiOC: Graphite=30:70) : Graphite : Binder= 89 : 6 : 5
Anode loading 8.8mg/cm2
Charge/Discharge conditions 0.1C, CCCV charge and CC discharge, 0V-2.0V.
Measuring temperature of AC impedance 25 ℃
Charge/Discharge conditions Charging：0.2C, CC, up to 1200mAh/g
Discharging：0.2C, CC, 2.0V cutoff
Charge/Discharge efficiency at the 1st cycle
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AC impedance
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CLPA-C07 has higher charge/discharge efficiency at the 1st cycle and lower AC impedance of anode than those of CMC-SBR.

Related laws and regulations

TSCA Not Listed
EINECS Not Listed
REACH Not Listed