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All-solid-state battery and preparation method thereof

An all-solid-state battery, solid-state electrolyte technology, applied in electrolyte battery manufacturing, battery electrodes, lithium batteries, etc., can solve the problems of poor chemical/electrochemical stability, low lithium ion conductivity, increased interface resistance, etc., to improve interface performance. , the effect of improving stability and high energy density

Pending Publication Date: 2022-07-12
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lithium-ion conductivity of the ceramic-based solid electrolyte is low, and the chemical / electrochemical stability of the interface with the positive and negative electrodes is poor, resulting in an increase in the interface resistance during cycling, especially when the metal lithium negative electrode is directly used, thereby triggering battery performance. fast decay of
In view of the fact that there is currently no solid electrolyte that is fully compatible with the positive and negative electrodes

Method used

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  • All-solid-state battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Prepare the battery as follows:

[0061] 1) The fluorinated carbon nanotubes are evenly dispersed on the surface of the metal lithium, the weight ratio of the fluorinated carbon nanotubes to the metal lithium layer is 3:100, and the metal lithium foil layer covered with the fluorinated carbon nanotubes on the surface is placed in a nitrogen atmosphere. After standing for 2 hours, Li formed on the surface of metal lithium. 3 N layer, detected by SEM, Li 3 The thickness of the N layer is 0.1 microns;

[0062] 2) The LiCoO 2 Materials and Li 2 MnO 3 The materials are mixed at a weight ratio of 100:2, and the surface is coated with Li by a mechanical fusion method. 2 MnO 3 LiCoO as a Li-rich material 2 Composite cathode material particles, LiCoO 2 Composite cathode material particles with conductive agent Super P, binder PVDF and ceramic electrolyte Li 6.5 La 3 Zr 1.5 Nb 0.5 O 12 Mix evenly according to the weight ratio of 93:2:2:3, and then apply the pole piec...

Embodiment 2

[0068] Prepare the battery as follows:

[0069] 1) The graphene fluoride is evenly dispersed on the surface of the metal lithium, the weight ratio of the graphene fluoride to the lithium metal layer is 4:100, and the lithium metal layer covered with the graphene fluoride on the surface is allowed to stand under nitrogen atmosphere for 3 hours, a 0.25 μm thick Li layer was formed on the surface of the metallic lithium layer 3 N layer, detected by SEM, Li 3 The thickness of the N layer is 0.25 microns;

[0070] 2) The LiNi 0.5 Co 0.2 Mn 0.3 O 2 Materials and Li 1.2 Mn 0.6 Ni 0.2 O 2 The lithium-rich materials are mixed at a weight ratio of 100:1.5, and the surface is coated with Li by a mechanical fusion method. 1.2 Mn 0.6 Ni 0.2 O 2 LiNi as Li-rich material 0.5 Co 0.2 Mn 0.3 O 2 Composite cathode material particles, LiNi 0.5 Co 0.2 Mn 0.3 O 2 Composite cathode material particles with Super, PVDF and Li 6 PS 5 Cl is mixed evenly in a weight ratio of 98.4:0...

Embodiment 3

[0076] Prepare the battery as follows:

[0077] 1) Disperse carbon fluoride fibers evenly on the surface of metal lithium, and the weight ratio of carbon fluoride fibers to metal lithium is 3.5:100, and place the metal lithium foil covered with carbon fluoride fibers on the surface for 2.5 hours in a nitrogen atmosphere. 0.15 μm thick Li formed on the lithium surface 3 N layer, detected by SEM, Li 3 The thickness of the N layer is 0.15 microns;

[0078] 2) The LiFe 0.4 Mn 0.6 PO 4 Materials and Li[Li 0.144 Ni 0.136 Co 0.136 Mn 0.544 ]O 2 Lithium-rich materials are mixed at a weight ratio of 100:1, and the surface is coated with Li[Li 0.144 Ni 0.136 Co 0.136 Mn 0.544 ]O 2 LiFe as Li-rich material 0.4 Mn 0.6 PO 4Composite cathode material particles, LiFe 0.4 Mn 0.6 PO 4 Composite cathode material particles with SuperP, PVDF and Li 3 InCl 6 Mix evenly according to the weight ratio of 95.5:1.5:1.5:1.5, and then apply the pole piece to obtain a composite posit...

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Abstract

The invention discloses an all-solid-state battery and a preparation method thereof, and the all-solid-state battery provided by the invention sequentially comprises a composite lithium negative electrode layer, a solid electrolyte layer and a composite positive electrode layer. The surface of the lithium negative electrode is modified with Li3N, so that the interface stability between the metal lithium negative electrode and the ceramic electrolyte can be improved, uniform deposition and stripping of metal lithium in the charging and discharging process can be guided, and formation of lithium dendrites is inhibited. The positive electrode is coated with the lithium-rich material, so that the interface performance between the ceramic electrolyte and the positive electrode can be improved, and the stability of the positive electrode material can also be improved. The obtained solid-state lithium battery has the advantages of high energy density, high safety and long service life.

Description

technical field [0001] The invention relates to the field of lithium batteries, and more particularly, to an all-solid-state battery and a preparation method thereof. Background technique [0002] Based on the depletion of fossil energy and the increasingly serious environmental problems, the development of new energy vehicles is an inevitable trend in history, but to eliminate the mileage anxiety of new energy vehicles based on lithium batteries, the requirements for their energy density are getting higher and higher. . In recent years, with the use of high nickel cathodes, silicon carbon anodes, especially metal lithium anodes, the energy density of lithium-ion batteries has been greatly improved, but they also face safety issues. [0003] Commercial lithium-ion batteries currently use carbonate-based organic liquid electrolytes, which are flammable and pose serious safety concerns. An effective way to solve the safety problem of lithium batteries is to use solid-state e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052H01M10/058
CPCH01M10/058H01M4/628H01M10/052Y02P70/50Y02E60/10H01M4/134H01M4/62H01M2300/0068H01M2300/0071H01M10/0562H01M4/366H01M4/1395H01M4/382
Inventor 徐雄文涂健谢健
Owner HUNAN LIFANG NEW ENERGY SCI & TECH