Coin-shaped lithium secondary battery and IoT device
地域：
Nagoya
摘要
Provided is a coin-shaped lithium secondary battery including a positive electrode plate which is a lithium complex oxide sintered plate; a negative electrode plate which is a titanium-containing sintered plate; a separator interposed between the positive electrode plate and the negative electrode plate; an electrolytic solution with which the positive electrode plate, the negative electrode, and the separator are impregnated; and an exterior body having a closed space, the closed space accommodating the positive electrode plate, the negative electrode plate, the separator, and the electrolytic solution, the lithium secondary battery having a thickness of 0.7 to 1.6 mm and a diameter of 10 to 20 mm.
說明書
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This application is a continuation application of PCT/JP2019/019169 filed May 14, 2019, which claims priority to Japanese Patent Application No. 2018-095781 filed May 17, 2018, the entire contents all of which are incorporated herein by reference.
The present invention relates to a coin-shaped lithium secondary battery and an IoT device.
權(quán)利要求
What is claimed is:1. A coin-shaped lithium secondary battery comprising:a positive electrode plate which is a lithium complex oxide sintered plate; a negative electrode plate which is a titanium-containing sintered plate; a separator interposed between the positive electrode plate and the negative electrode plate; an electrolytic solution with which the positive electrode plate, the negative electrode, and the separator are impregnated; and an exterior body comprising a closed space, the closed space accommodating the positive electrode plate, the negative electrode plate, the separator, and the electrolytic solution, the lithium secondary battery having a thickness of 0.7 to 1.6 mm and a diameter of 10 to 20 mm; wherein the separator is made of sintered ceramics selected from the group consisting of MgO, Al2O3, ZrO2, SiC, Si3N4, AlN, and cordierite. 2. The coin-shaped lithium secondary battery according to claim 1 , wherein the lithium secondary battery has an energy density of 35 to 200 mWh/cm3. 3. The coin-shaped lithium secondary battery according to claim 1 , wherein the lithium secondary battery has a battery capacity of 1.8 to 45 mAh. 4. The coin-shaped lithium secondary battery according to claim 1 , wherein a value obtained by dividing the battery capacity of the lithium secondary battery by the thickness of the positive electrode plate is 1.8 to 28.1 mAh/mm. 5. The coin-shaped lithium secondary battery according to claim 1 , wherein the positive electrode plate has a thickness of 60 to 450 μm. 6. The coin-shaped lithium secondary battery according to claim 1 , wherein the lithium complex oxide is lithium cobaltate. 7. The coin-shaped lithium secondary battery according to claim 1 , wherein the positive electrode plate has a porosity of 20 to 60%. 8. The coin-shaped lithium secondary battery according to claim 1 , wherein the positive electrode plate has a mean pore diameter of 0.1 to 10.0 μm. 9. The coin-shaped lithium secondary battery according to claim 1 , wherein the positive electrode plate is an oriented positive electrode plate containing a plurality of primary grains composed of the lithium complex oxide, the plurality of primary grains being oriented at an average orientation angle of over 0° and 30° or less with respect to the plate face of the positive electrode plate. 10. The coin-shaped lithium secondary battery according to claim 1 , wherein the negative electrode plate has a thickness of 70 to 500 μm. 11. The coin-shaped lithium secondary battery according to claim 1 , wherein the titanium-containing sintered body comprises lithium titanate or niobium titanium complex oxide. 12. The coin-shaped lithium secondary battery according to claim 1 , wherein the negative electrode plate has a porosity of 20 to 60%. 13. The coin-shaped lithium secondary battery according to claim 1 , wherein the negative electrode plate has a mean pore diameter of 0.08 to 5.0 μm. 14. The coin-shaped lithium secondary battery according to claim 1 , wherein the electrolytic solution is a solution containing lithium borofluoride (LiBF4) in a non-aqueous solvent composed of at least one selected from the group consisting of γ-butyrolactone (GBL), ethylene carbonate (EC), and propylene carbonate (PC). 15. The coin-shaped lithium secondary battery according to claim 1 , further comprising:a positive electrode current collector; and a negative electrode current collector. 16. The coin-shaped lithium secondary battery according to claim 1 , wherein the exterior body comprises a positive electrode can, a negative electrode can, and a gasket, and the positive electrode can and the negative electrode can are crimped via the gasket to form the closed space. 17. An IoT device comprising:a circuit board; and the coin-shaped lithium secondary battery according to claim 1 . 18. The IoT device according to claim 17 , wherein the coin-shaped lithium secondary battery is mounted on the circuit board by reflow solder.
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