Compositions for forming a porous insulating layer, electrode for non-aqueous electrolyte rechargeable battery having the porous insulating layer, the rechargeable battery and method for manufacturing the electrode
A composition for forming a porous insulating layer according to the present disclosure includes a solvent including an organic solvent, and an insulating inorganic particle. According to the present disclosure, a porous insulating layer prepared using the composition is positioned on an active material layer being on a main surface of a current collector, wherein the active material layer includes at least an active material capable of electrochemically intercalating and deintercalating lithium ions and an active material layer binder. A distance between Hansen solubility parameters of the active material layer binder and the organic solvent is greater than or equal to about 8.0 (MPa) 1/2 .
1. A composition for forming a porous insulating layer on an active material layer on a main surface of a current collector,
the composition for forming the porous insulating layer comprising a solvent and an insulating inorganic particle, the solvent comprising an organic solvent,
wherein a distance between Hansen solubility parameters of an active material layer binder and the organic solvent is greater than or equal to about 8.0 MPa 1/2 , and
wherein the active material layer comprises an active material capable of electrochemically intercalating and deintercalating lithium ions and the active material layer binder.
2. The composition of claim 1 , wherein a distance between Hansen solubility parameters of the active material and the organic solvent is greater than or equal to about 5.0 MPa 1/2 .
3. The composition of claim 1 , wherein a distance between Hansen solubility parameters of the active material and the organic solvent is greater than or equal to about 8.0 MPa 1/2 .
4. The composition of claim 1 , wherein a distance (Ra) between Hansen solubility parameters of graphene and the organic solvent is represented by Equation 1 , and is greater than or equal to about 5.0 MPa 1/2 :
Ra={ 4×(18.0−δ D(solvent) 2 +(9.3−δ P(solvent) 2 +(7.7−δ H(solvent) 2 } 1/2 . Equation 1
wherein, in Equation 1, δ D(solvent) denotes dispersion force of the organic solvent in (MPa) 1/2 , δ P(solvent) denotes polarity force of the organic solvent in (MPa) 1/2 , and δ H(solvent) denotes a hydrogen bond force of the organic solvent in (MPa) 1/2 .
5. The composition of claim 1 , wherein the composition for forming the porous insulating layer further comprises a porous insulating layer binder.
6. The composition of claim 1 , wherein the solvent comprises water.
7. The composition of claim 1 , wherein a boiling point of the organic solvent at 1 atm is greater than or equal to about 160° C.
8. The composition of claim 1 , wherein the organic solvent comprises an alcohol-based compound.
9. The composition of claim 1 , wherein the organic solvent comprises a glycolalkyl ether-based compound.
10. The composition of claim 1 , wherein the composition for forming the porous insulating layer further comprises a polyolefin-based polymer particle.
11. An electrode for a non-aqueous electrolyte rechargeable battery, the electrode comprising:
the current collector,
the active material layer on the main surface of the current collector, and
a porous insulating layer formed on the active material layer by utilizing the composition for forming the porous insulating layer of claim 1 .
12. A non-aqueous electrolyte rechargeable battery comprising the electrode for a non-aqueous electrolyte rechargeable battery of claim 11 .
13. A method for manufacturing an electrode for a non-aqueous electrolyte rechargeable battery, the method comprising:
forming a porous insulating layer utilizing a composition for forming a porous insulating layer on an active material layer on a main surface of a current collector,
wherein the active material layer comprises at least an active material capable of electrochemically intercalating and deintercalating lithium ions and an active material layer binder,
the composition for forming the porous insulating layer comprises at least a solvent and an insulating inorganic particle, the solvent comprising an organic solvent, and
a distance between Hansen solubility parameters of the active material layer binder and the organic solvent is greater than or equal to about 8.0 MPa 1/2 .