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Preparation method of all-solid-state lithium battery with high specific energy

A production method and all-solid-state technology, which is applied in the field of lithium-ion batteries, can solve problems such as large interface impedance, large specific capacity loss of pole pieces, and reduction of active material content of pole pieces, so as to achieve the effect of reducing interface resistance and high safety

Active Publication Date: 2018-07-06
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The closeness of the contact between the solid electrolyte and the electrode in the all-solid lithium battery directly affects the transmission of lithium ions. The solid lithium battery prepared by simple lamination and hot pressing of the electrode sheet and the solid electrolyte film has too large interface impedance; Solid electrolyte can improve the electrolyte / electrode interface contact and reduce interface impedance, but the amount of electrolyte added to the electrode is usually relatively large (20% to 30% mass ratio), which will reduce the active material content of the pole piece, resulting in a large loss of specific capacity of the pole piece

Method used

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  • Preparation method of all-solid-state lithium battery with high specific energy
  • Preparation method of all-solid-state lithium battery with high specific energy

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Positive electrode pulping is according to the following mass ratio: nickel cobalt lithium manganese oxide (NCM523) positive electrode material 97.9%, Super P Li conductive agent 1%, PVDF (HSV-900) binder 1%; ammonium bicarbonate pore-forming agent 0.1%, through a double planetary mixer, using NMP as a solvent to prepare positive electrode slurry with a solid content of 65%. Coating the positive electrode slurry on the aluminum foil current collector, heat treatment at 140°C for 60s, and then roll pressing to obtain the positive electrode sheet;

[0037] (2) Negative electrode pulping is according to the following mass ratio: 98.4% of artificial graphite G9, 0.5% of Super P Li conductive agent, 1% of CMC (Daicel) binder, 0.1% of ammonium bicarbonate pore-forming agent, through a double planetary mixer , using deionized water as a solvent to prepare negative electrode slurry with a solid content of 45%. Coating the negative electrode slurry on the copper foil curren...

Embodiment 2

[0041] (1) Positive electrode pulping is in accordance with the following mass ratio: nickel cobalt lithium aluminate (NCA) positive electrode material 89%, acetylene black conductive agent 5%, PVA binder 3%; ammonium carbonate pore-forming agent 3%, through a double planetary mixer , using NMP as a solvent to prepare positive electrode slurry with a solid content of 80%. Coating the positive electrode slurry on the aluminum foil current collector, heat treatment at 80°C for 600s, and then roll pressing to obtain the positive electrode sheet;

[0042] (2) Negative electrode pulping is according to the following mass ratio: silicon carbon accounts for 91%, carbon nanotube conductive agent 3%, SBR binding agent 3%, ammonium carbonate pore-forming agent 3%, pass through double planetary mixer, take deionized water as The solvent was prepared into negative electrode slurry with a solid content of 60%. Coating the negative electrode slurry on the copper foil current collector, hea...

Embodiment 3

[0046] (1) Positive electrode pulping is according to the following mass ratio: 95% of lithium nickel manganese oxide positive electrode material, 2% of graphene conductive agent, 1.5% of PTFE binder; The solvent was prepared into positive electrode slurry with a solid content of 30%. Coating the positive electrode slurry on the aluminum foil current collector, heat treatment at 140°C for 60s, and then roll pressing to obtain the positive electrode sheet;

[0047] (2) Negative electrode pulping is according to the following mass ratio: hard carbon accounts for 93%, Super P Li conductive agent 2%, CMC (Daicel) binder 3.5%, ammonium acetate pore-forming agent 1.5%, pass through double planetary mixer, with Deionized water was used as a solvent to prepare negative electrode slurry with a solid content of 30%. Coating the negative electrode slurry on the copper foil current collector, heat treatment at 100°C for 350s, and then roll pressing to obtain the negative electrode sheet;...

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Abstract

The invention discloses a preparation method of an all-solid-state lithium battery with high specific energy. The preparation method comprises the following steps: forming pores in coating processes of a positive pole piece and a negative pole piece by using a pore forming agent; rolling the prepared pole pieces, and then, coating a thin-layer polymer electrolyte solution on the surface of one side of each pole piece; and finally, winding or laminating the positive pole piece and the negative pole piece with electrolyte layers at one sides so as to be assembled into an all-solid-state lithiumion battery. Compared with the prior art, the method disclosed by the invention has the advantages that the polymer electrolyte solutions can permeate into the pole pieces through the pores obtained by the pore forming agent, and the interfacial contact area between each pole piece and the polymer electrolyte is larger, so that the ionic conductivity of an electrode material is increased; and theall-solid-state lithium battery prepared by the method has the advantages of low interfacial resistance, high energy density, high stability and safety and the like.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a method for manufacturing a high-specific-energy all-solid-state lithium battery. Background technique [0002] Lithium-ion power batteries have the advantages of high energy density, long life, and environmental protection, and are currently the most widely used power source for new energy vehicles. With the continuous promotion of lithium-ion battery new energy vehicles, traditional lithium-ion power batteries have been difficult to meet the safety and mileage requirements of vehicles. In particular, the electrolytes used in current lithium-ion power batteries are mostly flammable and explosive organic solvent systems, which pose a serious safety hazard when used in the automotive field. All-solid-state lithium-ion power batteries made of solid electrolytes can greatly improve the performance of power batteries. Security has received widespread attention. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 袁丽只邵乐田占元郑勇胡朝文冯皓
Owner SHAANXI COAL & CHEM TECH INST
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