Pouch type all-solid-state lithium secondary battery and method for producing the same
A manufacturing method of an all-solid-state lithium secondary battery including a solid polymer electrolyte, including preparing an all-solid state lithium secondary battery by interposing a polymer electrolyte between a cathode and an anode; hardening the polymer electrolyte by applying a pressure and heat to the all-solid-state lithium secondary battery; activating the all-solid-state lithium secondary battery by applying a current; and removing a gas generated in the activated all-solid state lithium secondary battery. By hardening a polymer electrolyte interposed between a cathode and an anode through applying a pressure and heat, a bubble or dead area inside solid polymer electrolyte is minimized with providing an electrode having uniform thickness. By repeating activation operation and removing gas, bonding of electrode stack is more enhanced, and stability of a battery is improved.
1 . A manufacturing method of an all-solid-state lithium secondary battery including a solid polymer electrolyte, comprising:
preparing an all-solid-state lithium secondary battery by interposing a polymer electrolyte between a cathode composite electrode and an anode composite electrode;
hardening the polymer electrolyte to form a solid polymer electrolyte by simultaneously applying a pressure of 500 Pa to 2,000 Pa and heat of 80° C. to 100° C. for 30 to 120 minutes to the all-solid-state lithium secondary battery;
activating the all-solid-state lithium secondary battery by applying a current of 0.05 C to 0.2 C; and
removing a gas generated in the activated all-solid-state lithium secondary battery,
wherein the activating and the removing a gas are repeated 2 to 5 times,
wherein the cathode composite electrode and the anode composite electrode are formed to include polyethylene glycol dimethyl ether as an ion conductive material, a lithium salt, a binder, and a conductive agent,
wherein the polymer electrolyte comprises polyethylene glycol dimethyl ether, bisphenol A, and an initiator,
wherein the polymer electrolyte comprises polyethylene glycol dimethyl ether, and
wherein the ion conductive material and the binder in each of the cathode composite electrode and the anode composite electrode are mixed in a ratio of 2:1 to 1:2.
2 . The manufacturing method of an all-solid-state lithium secondary battery including a solid polymer electrolyte of claim 1 ,
wherein the cathode composite electrode is selected from a group composing of LifePO 4 , LiNi 0.5 Mn 1.5 O 4 , LiNiCoAlO 2 , LiMn 2 O 4 , LiCoO 2 , LiNiCoMnO 2 , lithium nickel cobalt manganese aluminum, and their combinations.
3 . The manufacturing method of an all-solid-state lithium secondary battery including a solid polymer electrolyte of claim 1 ,
wherein the anode composite electrode is selected from a group composing of an artificial graphite, natural graphite, graphene, metal oxide, Si, SiO x , Li 4 Ti 5 O 12 and their combinations.
4 . The manufacturing method of an all-solid-state lithium secondary battery including a solid polymer electrolyte of claim 1 ,
wherein the solid polymer electrolyte formed by hardening is interposed as a separate layer between the cathode composite electrode and the anode composite electrode, and
wherein in 100 parts by weight of each of the cathode composite electrode and the anode composite electrode, the polyethylene glycol dimethyl ether as the ion conductive material is included in 5 to 15 parts by weight.