Vertical-type baking apparatus of positive electrode material for secondary battery

A vertical-type firing apparatus for a positive electrode material for a secondary battery for firing the positive electrode material for the secondary battery by moving the positive electrode material in a vertical direction, the vertical-type firing apparatus comprising:

• a vertical-type firing furnace comprising an exhaust part positioned in an upper portion and through which internal gas is exhausted, an air supply part positioned in a lower portion and through which external gas is supplied, and a firing space positioned between the exhaust part and the air supply part and extending in the vertical direction;
• and
• a heater configured to heat the firing space in the vertical-type firing furnace,
• wherein the positive electrode material for the secondary battery is put into the exhaust part and discharged from the air supply part through the firing space,
• wherein the positive electrode material for the secondary battery is accommodated in a plurality of saggers stacked in the vertical direction in the firing space, with each of the plurality of saggers comprising one or more through-type slits at a bottom,
• wherein, for every sagger that is not a first sagger, the internal gas generated during the firing of the positive electrode material for the secondary battery is exhausted from the respective sagger through the one or more through-type slits at the bottom of a sagger above the respective sagger,
• wherein the firing space comprises a temperature-raising space communicating with the exhaust part, a cooling space communicating with the air supply part, and a temperature-maintaining space communicating with the temperature-raising space and the cooling space, the temperature-maintaining space between the temperature-raising space and the cooling space,
• wherein temperature of the temperature-maintaining space is higher than the temperature of the temperature-raising space and the temperature of the cooling space,
• wherein an amount of carbon dioxide gas generated from the positive electrode material in the temperature-raising space is greater than an amount of carbon dioxide gas generated from the positive electrode material in the temperature-maintaining space,
• wherein the vertical-type firing furnace further comprises a rectangular pillar- shaped heat insulating material that extends integrally in the vertical direction to form the air supply part, the exhaust part, and the firing space,
• wherein the heater is positioned inside the rectangular pillar-shaped heat insulating material to correspond to the temperature-maintaining space,
• wherein the heater heats only the temperature-maintaining space, and
• wherein a heat balance is generated in the firing space by the positive electrode material moving from an upper portion to a lower portion of the firing space in a direction opposite to the moving direction of the gas.