All-solid-state lithium battery with gradient structure and preparation method thereof

A gradient structure, all-solid-state technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of easy depletion of Li ions, large interface impedance, and easy deterioration of electrodes and electrolytes, and achieves improved diffusion rate. , to achieve the effect of contact

Active Publication Date: 2014-04-23
王海斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the battery electrode layer in the prior art, the concentration of the electrolyte and the electrode material is uniformly distributed, and there is a defect that Li ions are easily depleted during charging or discharging at a high current rate, resulting in a decrease in the battery performance of the charging or discharging capacity. For an all-solid-state lithium battery with an electrode layer, the contact between the electrode and the electrolyte is easy to deteriorate, the interface impedance is very large, and the battery cannot be charged and discharged at a high rate. Normal working all-solid-state lithium battery with gradient structure

Method used

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  • All-solid-state lithium battery with gradient structure and preparation method thereof
  • All-solid-state lithium battery with gradient structure and preparation method thereof
  • All-solid-state lithium battery with gradient structure and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0038] (a) Change the amount of the electrode material and solid electrolyte to be added to form the electrode layer so that the mass fraction of the electrode material is 10%, 50%, and 100%, and prepare a positive electrode slurry. The electrode material is LiFePO 4, a mixture of polyvinylidene fluoride and conductive carbon (mass ratio 8:1:1), the electrolyte is a mixture of polysiloxane and lithium salt (mass ratio 8:2), and the slurry has a viscosity of 3cP at room temperature;

[0039] (b) Coating the collector electrode with the various positive electrode slurries, so that the concentration gradient of the positive electrode material decreases sequentially from the collector electrode of the electrode active material layer to the surface of the positive electrode layer, thereby stacking multiple positive electrode thin film layers with different solid concentrations; each The thickness of each positive film layer is about 50 μm;

[0040] (c) Configure the electrolyte sl...

Embodiment 2

[0048] (a) Mixing a certain amount of spinel structure LiMn 2 o 4 It is a positive electrode active material, a certain amount of acetylene black is used as a conductive material, a certain amount of polyvinylidene fluoride is used as a binder, and the mass ratio of the three is 9:5:5, and a certain amount of polysiloxane and lithium salt, The ratio of the two is 8:2, so that the mass ratio of the electrolyte component to the electrode material is maintained at 7:3, changing the LiMn 2 o 4 particle size (0.1μm, 0.3μm, 0.6μm), so as to prepare a variety of cathode slurries with different particle sizes of active materials;

[0049] (b) Coating the collector electrode with the various positive electrode slurries, so that the particle size of the positive electrode active material increases sequentially from the collector electrode of the electrode active material layer to the surface of the positive electrode layer, and the thickness of each positive electrode film layer is ab...

Embodiment 3

[0055] (a) Mixing a certain amount of LiCoO 2 A certain amount of acetylene black is used as a conductive material, a certain amount of polyvinylidene fluoride is used as a binder, and the mass ratio of the three is 9:5:5. A certain amount of polyoxyethylene and lithium salt, two The ratio is 8:2, so that the mass ratio of the electrolyte component to the electrode material is maintained at 7:3, and the molecular weight of the polyoxyethylene is changed (8000, 400000, 4000000), so that the molecular weight of the prepared electrolyte polymer is much different A positive electrode slurry;

[0056] (b) Coating the collector with the various positive electrode slurries, so that the molecular weight of polyoxyethylene increases sequentially from the collector to the surface of the positive electrode layer, and the thickness of each positive electrode film layer is about 50 μm;

[0057] (c) Configure electrolyte slurry, polyoxyethylene (molecular weight: 4,000,000) and lithium sal...

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Abstract

The invention discloses an all-solid-state lithium battery with a gradient structure and a preparation method thereof. The all-solid-state lithium battery comprises a cathode with a gradient structure layer, a solid electrolyte layer, and a metal anode or an anode with a gradient structure layer; the preparation method comprises the following steps: preparing cathode slurries with different component concentrations or particle sizes or molecular weights, coating a collector electrode with the cathode slurries according to the component concentration gradient or particle size gradient or molecular weight gradient to prepare an electrode layer, coating the electrode layer with the solid electrolyte layer, finally attaching the metal anode, or preparing anode slurries with different component concentrations or particle sizes or molecular weights, coating the electrolyte layer with the anode slurries according to an opposite concentration gradient or particle size gradient or molecular weight gradient based on the preparation method of the cathode electrode layer, and finally attaching a collector electrode to obtain the all-solid-state lithium battery with a gradient structure; the preparation method is simple, and the prepared all-solid-state lithium battery is stable in large-rate charge and discharge, and can work normally at large current.

Description

technical field [0001] The invention relates to an all-solid lithium battery with a gradient structure and a preparation method thereof, belonging to the field of solid batteries. Background technique [0002] Against the backdrop of the dual trends of energy crisis and environmental protection, the development of new energy vehicles, such as electric vehicles (EV), hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV), has become an urgent need. As the energy storage device of new energy vehicles, batteries have become one of the core key technologies of new energy vehicles. [0003] Compared with liquid electrolyte batteries, all-solid-state batteries also have greater room for development in terms of improving battery energy density, widening the operating temperature range, and extending service life. Since the beginning of the 21st century, diversification has become an important development direction in the field of secondary batteries. While broa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525H01M10/058
CPCY02E60/122H01M4/13H01M4/139H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 刘晋贾明李劼林月程昀
Owner 王海斌
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