Binder composition for rechargeable battery and rechargeable lithium battery having the same
A binder composition for a rechargeable battery, including a binder polymer having a glass transition temperature (Tg) of 20° C. or less, and having a storage modulus (60° C.) of 50-150 MPa. The binder composition according to an embodiment can improve life characteristics of the rechargeable battery by efficiently controlling expansion of a negative electrode plate.
1. A rechargeable battery binder composition, comprising:
one or more nanoparticles having an average particle diameter of 10 nm to 100 nm, and
a binder polymer having a glass transition temperature (Tg) of 20° C. or less,
wherein the rechargeable battery binder composition has a storage modulus (60° C.) of 50-150 MPa, and
wherein the nanoparticles comprise organic particles utilized as a silane coupling agent.
2. The binder composition of claim 1 , wherein the glass transition temperature (Tg) of the binder polymer is in a range of −20° C. to 20° C.
3. The binder composition of claim 1 , further comprising nanoparticles that are inorganic particles.
4. The binder composition of claim 3 , wherein the inorganic particles comprise one or more selected from the group consisting of silica, alumina, titania and zirconia.
5. The binder composition of claim 1 , wherein the silane coupling agent includes one or more selected from the group consisting of alkoxy, halogen, amino, vinyl, glycydoxy and hydroxyl groups.
6. The binder composition of claim 3 , wherein the inorganic particles comprise one or more selected from the group consisting of metal oxides and metalloid oxides.
7. The binder composition of claim 1 , wherein the binder polymer is a styrene-butadiene rubber based polymer.
8. An electrode for a rechargeable battery, comprising:
an electrode active material; and
the binder composition of claim 1 .
9. The electrode of claim 8 , wherein the electrode active material comprises one or more active materials selected from the group consisting of a Si-based active material, an Sn-based active material, oxides thereof, and alloys thereof.
10. The electrode of claim 8 , wherein the electrode is a negative electrode.
11. A rechargeable battery comprising:
a positive electrode;
a negative electrode; and
an electrolytic solution,
wherein the positive electrode or the negative electrode is the electrode of claim 8 .
12. The rechargeable battery of claim 11 , wherein the glass transition temperature (Tg) of the binder polymer is in a range of −20° C. to 20° C.
13. The rechargeable battery of claim 11 , further comprising nanoparticles that are inorganic particles.
14. The rechargeable battery of claim 13 , wherein the inorganic particles comprise one or more selected from the group consisting of metal oxides and metalloid oxides.
15. The rechargeable battery of claim 11 , wherein the binder polymer is a styrene-butadiene rubber based polymer.
16. The rechargeable battery of claim 11 , wherein the electrode is the negative electrode.
17. A rechargeable battery binder composition, comprising:
one or more nanoparticles having an average particle diameter of 10 nm to 100nm, and
a binder polymer having a glass transition temperature (Tg) of 20° C. or less,
wherein the rechargeable battery binder composition has a storage modulus (60° C.) of 50-150 MPa, and
wherein the nanoparticles comprise organic particles utilized as a coupling agent between the nanoparticles and binder polymer.