Lithium secondary battery and manufacturing method thereof
Disclosed is a lithium secondary battery provided with a separator, having improved thermal stability by including a micro-particle coating layer manufactured using Furan-based polymers, for example, polymers having polymer unit including furanyl or furoyl. The lithium secondary battery includes a cathode, an anode, an electrolyte, and a separator disposed between the cathode and the anode and including a coating layer including a micro-particle. The micro-particle includes the second polymer which may include cross-linked first polymer.
1. A lithium secondary battery comprising:
a cathode;
an anode;
an electrolyte; and
a separator disposed between the cathode and the anode and comprising a coating layer comprising a polymer admixture,
wherein the polymer admixture comprises a second polymer comprising a cross-linking structure of a first polymer comprising reacted monomers containing one or more furoyl groups, and wherein the first polymer comprises reacted furoyl ether methacrylate (FEEMA) monomers cross-linked by a first cross-linking agent.
2. The lithium secondary battery of claim 1 , wherein the polymer admixture comprises a micro-particle.
3. The lithium secondary battery of claim 2 , wherein the first cross-linking agent is ethylene glycol dimethacrylate.
4. The lithium secondary battery of claim 1 , wherein the first polymer comprises the first cross-linking agent in an amount of about 1 mol % or greater and about 5 mol % or less based on the total moles of the FEEMA monomers and the first cross-linking agent.
5. The lithium secondary battery of claim 1 , wherein the second polymer comprises a second cross-linking agent.
6. The lithium secondary battery of claim 5 , wherein the second cross-linking agent is bismaleimide.
7. A vehicle comprising a lithium secondary battery of claim 1 .