Lithium ion secondary battery
A lithium ion secondary battery includes an aqueous electrolyte solution and has a high discharge capacity. The lithium ion secondary battery includes an anode layer including an anode active material, a cathode layer including a cathode active material, and an electrolyte solution including a solvent and an electrolyte, wherein the anode active material includes elemental sulfur, the cathode active material includes Li element, such as a Li-containing compound, the solvent includes water as a main component, the electrolyte includes lithium bis(trifluoromethanesulfonyl)imide, and the electrolyte solution includes no less than 10 mol of the lithium bis(trifluoromethanesulfonyl)imide per 1 kg of the water.
1. A lithium ion secondary battery comprising:
an anode layer including an anode active material;
a cathode layer including a cathode active material; and
an electrolyte solution including a solvent and an electrolyte, wherein:
the anode active material includes elemental sulfur;
the cathode active material includes Li;
the solvent includes water;
the electrolyte includes lithium bis(trifluoromethanesulfonyl)imide; and
the electrolyte solution includes no less than 10 mol of the lithium bis(trifluoromethanesulfonyl)imide per 1 kg of the water in the electrolyte solution.
2. The lithium ion secondary battery according to claim 1 , wherein the anode active material includes the elemental sulfur in an amount not less than 30% by weight based on the total weight of the anode active material.
3. The lithium ion secondary battery according to claim 1 , wherein the electrolyte includes the lithium bis(trifluoromethanesulfonyl)imide in an amount not less than 50 mol % based on the total amount of the electrolyte.
4. The lithium ion secondary battery according to claim 2 , wherein the electrolyte includes the lithium bis(trifluoromethanesulfonyl)imide in an amount not less than 50 mol % based on the total amount of the electolyte.
5. The lithium ion secondary battery according to claim 1 , wherein the cathode active material further includes Ni and Mn.
6. The lithium ion secondary battery according to claim 2 , wherein the cathode active material further includes Ni and Mn.
7. The lithium ion secondary battery according to claim 3 , wherein the cathode active material further includes Ni and Mn.
8. The lithium ion secondary battery according to claim 4 , wherein the cathode active material further includes Ni and Mn.
9. The lithium ion secondary battery according to claim 1 , wherein the cathode active material is a Li-containing compound.
10. The lithium ion secondary battery according to claim 1 , wherein the Li in the cathode active material is a Li-containing compound including Ni and Mn.
11. The lithium ion secondary battery according to claim 1 , wherein the cathode active material includes a Li-containing compound including at least one selected from the group consisting of Co, Ni, Mn and Ti.
12. The lithium ion secondary battery according to claim 1 , wherein the Li in the cathode active material is in the form of a Li oxide or Li phosphate.
13. The lithium ion secondary battery according to claim 12 , wherein the Li oxide or Li phosphate further include at least one selected from the group consisting of Co, Ni, Mn and Ti.