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CN-122025876-A - Lithium supplementing method, lithium supplementing device and application of all-solid-state battery

CN122025876ACN 122025876 ACN122025876 ACN 122025876ACN-122025876-A

Abstract

The invention relates to the technical field of manufacturing of all-solid-state lithium batteries, in particular to a lithium supplementing method, a lithium supplementing device and application of the all-solid-state lithium battery. The lithium supplementing method of the all-solid-state battery comprises the following steps of (a) providing a solid electrolyte membrane, transferring a lithium supplementing material onto one side surface of the solid electrolyte membrane to form a composite body with a lithium supplementing layer tightly attached to the solid electrolyte membrane, and (b) transferring the composite body onto the surface of a negative electrode plate, so that the lithium supplementing layer is clamped between the negative electrode plate and the solid electrolyte membrane to form a composite structure with the negative electrode plate, the lithium supplementing layer and the solid electrolyte membrane laminated in sequence. According to the lithium supplementing method of the all-solid-state battery, through a twice continuous transfer printing process, the problems of edge burrs and sharp protrusions generated in the transfer printing process of the direct lithium belt are eliminated, the risk of internal short circuit of the battery is reduced, and the safety of the battery manufacturing process and recycling is improved.

Inventors

  • ZHANG YONGQING
  • KONG SHAOFENG

Assignees

  • 奇瑞汽车股份有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The lithium supplementing method of the all-solid-state battery is characterized by comprising the following steps of: (a) Providing a solid electrolyte membrane, and transferring a lithium supplementing material onto one side surface of the solid electrolyte membrane to form a composite body of a lithium supplementing layer and the solid electrolyte membrane in a close fit manner; (b) And transferring the composite to the surface of the negative electrode plate, so that the lithium supplementing layer is clamped between the negative electrode plate and the solid electrolyte membrane to form a composite structure in which the negative electrode plate, the lithium supplementing layer and the solid electrolyte membrane are sequentially laminated.
  2. 2. The lithium supplementing method for an all-solid-state battery according to claim 1, wherein in the step (a), the transfer temperature of the lithium supplementing material is 23-27 ℃, the transfer pressure is 1-8 t, and the tape running speed is 5-50 m/min.
  3. 3. The lithium supplementing method for an all-solid-state battery according to claim 1, wherein in the step (b), the transfer temperature of the composite is 23-27 ℃, the transfer pressure is 2-30 t, and the tape running speed is 5-50 m/min.
  4. 4. The lithium supplementing method for an all-solid-state battery according to claim 1, wherein the thickness of the solid electrolyte membrane is 10-50 μm.
  5. 5. The lithium supplementing method for an all-solid battery according to claim 1, wherein the lithium supplementing material is transferred onto one side surface of the solid electrolyte membrane in the form of a lithium metal tape; preferably, the thickness of the lithium metal strip is 1-5 μm.
  6. 6. The lithium supplementing method for an all-solid-state battery according to claim 5, wherein the width of the lithium metal strip is 50-220 mm; and/or, the width of the negative electrode plate is 50-220 mm.
  7. 7. A lithium supplementing device for implementing the lithium supplementing method of an all-solid-state battery according to any one of claims 1 to 6, comprising: the first transfer unit is used for transferring the lithium supplementing material onto the solid electrolyte membrane and comprises a first roller press and a second roller press which are oppositely arranged; The second transfer printing unit is arranged at the downstream of the first transfer printing unit and is used for transferring the solid electrolyte composite film with the lithium supplementing layer onto the negative electrode plate, and the second transfer printing unit comprises a third roller press and a fourth roller press which are oppositely arranged; the unreeling mechanism is used for conveying the solid electrolyte membrane, the lithium supplementing material and the negative electrode plate respectively; And the winding mechanism is used for winding the transferred composite structure and the waste baseband.
  8. 8. A method for preparing a lithium-supplementing composite negative electrode for an all-solid-state battery, which is characterized by comprising the lithium-supplementing method for an all-solid-state battery according to any one of claims 1-6.
  9. 9. An all-solid-state battery, characterized by comprising the lithium-supplementing composite negative electrode prepared by the preparation method of the lithium-supplementing composite negative electrode for the all-solid-state battery according to claim 8.
  10. 10. An electric power consumption device comprising the all-solid-state battery according to claim 9.

Description

Lithium supplementing method, lithium supplementing device and application of all-solid-state battery Technical Field The invention relates to the technical field of manufacturing of all-solid-state lithium batteries, in particular to a lithium supplementing method, a lithium supplementing device and application of the all-solid-state lithium battery. Background The all-solid-state battery has obvious irreversible loss of active lithium in the first charge and discharge process, and lithium needs to be supplemented for compensation. The direct transfer printing technology of the negative electrode lithium belt has outstanding safety risk, and metal burrs generated by the direct transfer printing of the lithium belt are easy to cause the growth of lithium dendrites, so that the short circuit of the battery is caused, and the large-scale application is seriously restricted. The direct lithium supplementing technology of the negative electrode lithium powder has outstanding safety risk, and the lithium powder is coated on the surface of the negative electrode and a layer of glue is coated at the same time, so that the transmission of lithium ions is blocked and uneven, and the local overcharge and over-discharge risk is increased. In view of this, the present invention has been proposed. Disclosure of Invention Aiming at the problems of safety risk defect, high interface impedance and the like of the existing solid-state battery lithium supplementing technology, the invention provides an all-solid-state battery lithium supplementing method, a lithium supplementing device and application, burrs and sharp protrusions in a lithium band lithium supplementing process are eliminated, the battery short circuit rate is reduced, the safety is improved, the material impedance between a lithium powder lithium supplementing layer and a negative electrode is reduced, and lithium ion transmission is improved. In order to achieve the above object of the present invention, the following technical solutions are specifically adopted: A lithium supplementing method for full-solid battery includes such steps as providing a solid electrolyte film, transferring the lithium supplementing material to one surface of said solid electrolyte film to form a composite body with lithium supplementing layer and solid electrolyte film, and transferring said composite body to the surface of negative electrode plate to sandwich said lithium supplementing layer between said negative electrode plate and solid electrolyte film to form a sequentially laminated composite structure of negative electrode plate, lithium supplementing layer and solid electrolyte film. The lithium supplementing method of the all-solid-state battery eliminates the problems of edge burrs and sharp protrusions generated in the direct lithium belt transfer process through a two-time continuous transfer process, reduces the risk of internal short circuits of the battery, improves the safety of battery manufacturing process and recycling, avoids the problem of blocked lithium ion transmission caused by the introduction of an adhesive in the traditional lithium powder lithium supplementing process, forms a low-impedance lithium ion transmission interface, reduces the environmental exposure area of a lithium material by more than 90% by means of the packaging protection effect of a solid electrolyte membrane on a lithium layer, eliminates the thermal runaway hidden trouble caused by the reaction of lithium and air, improves the initial coulomb efficiency to more than 92%, improves the cycle life of the battery by more than 30%, and realizes the cooperative optimization of safety, interface compatibility and electrochemical performance. The lithium supplementing device for realizing the lithium supplementing method of the all-solid-state battery comprises a first transfer unit, a second transfer unit and a winding mechanism, wherein the first transfer unit is used for transferring lithium supplementing materials onto a solid electrolyte membrane, the first transfer unit comprises a first roller press and a second roller press which are oppositely arranged, the second transfer unit is arranged at the downstream of the first transfer unit and used for transferring a solid electrolyte composite membrane with a lithium supplementing layer onto a negative electrode plate, the second transfer unit comprises a third roller press and a fourth roller press which are oppositely arranged, the winding mechanism is used for conveying the solid electrolyte membrane, the lithium supplementing materials and the negative electrode plate respectively, and the winding mechanism is used for winding the transferred composite structure and a waste baseband. The lithium supplementing device for the all-solid-state battery constructs a continuous twice transfer production line by arranging the first transfer unit and the second transfer unit, realizes accurate and efficient transfer from a lithium suppl