Composition for preparing porous insulating layer, electrode for non-aqueous rechargeable lithium battery, non-aqueous rechargeable lithium battery, method of preparing electrode for non-aqueous rechargeable lithium battery
A composition for preparing a porous insulating layer for a non-aqueous electrolyte rechargeable battery, the composition including a polyolefin-based polymer particle, a binder, an insulating inorganic particle, and a solvent including water and an organic solvent. The binder includes a polymer, and the polymer includes at least one monomer unit (A) represented by Chemical Formula 1 and at least one monomer unit (B) represented by Chemical Formula 2, where a weight ratio (A)/(B) of the monomer unit (A) and the monomer unit (B) ranges from about 40/60 to about 80/20:
1. A composition for preparing a porous insulating layer for a non-aqueous electrolyte rechargeable battery, the composition comprising:
a polyolefin-based polymer particle;
a binder;
an insulating inorganic particle; and
a solvent comprising water and an organic solvent,
the binder comprises a polymer,
the polymer comprises at least one monomer unit (A) represented by Chemical Formula 1 and at least one monomer unit (B) represented by Chemical Formula 2, and
in the polymer, a weight ratio (A)/(B) of the monomer unit (A) to the monomer unit (B) ranges from about 40/60 to about 80/20:
wherein,
R 1 , R 2 , and R 3 are each independently a hydrogen atom or a C1 to C3 alkyl group,
wherein,
R 4 and R 5 are each independently a hydrogen atom or a C1 to C3 alkyl group, and
X is selected from a heterocyclic group where at least one hydrogen is substituted with a C1 to C3 alkyl group, and an unsubstituted heterocyclic group,
wherein X comprises at least one nitrogen atom as a ring-forming atom.
2. The composition for preparing the porous insulating layer for a non-aqueous electrolyte rechargeable battery of claim 1 , wherein the polymer comprises less than or equal to about 10 wt % of an ionic monomer unit.
3. The composition for preparing the porous insulating layer for a non-aqueous electrolyte rechargeable battery of claim 1 , wherein X comprises a nitrogen atom and an oxygen atom.
4. The composition for preparing the porous insulating layer for a non-aqueous electrolyte rechargeable battery of claim 1 , wherein a boiling point of the organic solvent at 1 atm is greater than or equal to about 160° C.
5. The composition for preparing the porous insulating layer for a non-aqueous electrolyte rechargeable battery of claim 1 , wherein the organic solvent comprises a glycolalkylether-based compound.
6. An electrode for a non-aqueous electrolyte rechargeable battery, the electrode comprising:
a current collector;
an active material layer on the current collector and comprising an active material capable of electrochemically intercalating and deintercalating lithium ions; and
a porous insulating layer on the active material layer and prepared using the composition for preparing the porous insulating layer of claim 1 .
7. The electrode for a non-aqueous electrolyte rechargeable battery of claim 6 , wherein the active material layer comprises a binder for an active material layer,
wherein a distance between a Hansen solubility parameter of the binder for the active material layer and a Hansen solubility parameter of the organic solvent is greater than or equal to about 8.0 (MPa) 1/2 .
8. A non-aqueous electrolyte rechargeable battery comprising the electrode for a non-aqueous electrolyte rechargeable battery of claim 6 .
9. A method of preparing an electrode for a non-aqueous electrolyte rechargeable battery, the method comprising:
forming a porous insulating layer utilizing a composition for preparing a porous insulating layer on an active material layer, the active material layer being formed on a current collector and comprising an active material capable of electrochemically intercalating and deintercalating lithium ions,
wherein the composition for preparing the porous insulating layer comprises a polyolefin-based polymer particle, a binder, an insulating inorganic particle, and a solvent comprising water and an organic solvent,
the binder comprises a polymer,
the polymer comprises at least one monomer unit (A) represented by Chemical Formula 1 and at least one monomer unit (B) represented by Chemical Formula 2, and
in the polymer, a weight ratio (A)/(B) of the monomer unit (A) to the monomer unit (B) ranges from about 40/60 to about 80/20:
wherein,
R 1 , R 2 and R 3 are each independently a hydrogen atom or a C1 to C3 alkyl group,
wherein
R 4 and R 5 are each independently a hydrogen atom or a C1 to C3 alkyl group, and
X is selected from a heterocyclic group where at least one hydrogen is substituted with a C1 to C3 alkyl group, and an unsubstituted heterocyclic group,
wherein X comprises at least one nitrogen atom as a ring-forming atom.
10. The method of claim 9 , wherein the polymer comprises less than or equal to about 10 wt % of an ionic monomer unit.