All-solid-state battery and preparation method thereof

A technology of all-solid-state batteries and solid-state electrolytes, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve problems such as poor exercise capacity, affecting battery energy density and power density, and high internal resistance of solid-state batteries Cycling performance and rate performance, improving ion mobility, and improving the effect of interface contact

Pending Publication Date: 2021-11-05
SVOLT ENERGY TECH (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the interface between the electrode and the electrolyte, the contact mode between the traditional liquid electrolyte and the positive and negative electrodes is liquid / solid contact, the interface wettability is good, and no large impedance will be generated between the interfaces. In contrast, the solid electrolyte and the positive and negative electrodes The contacts are in the form of a solid / solid interface, the contact area is small, the contact tightness with the pole piece is poor, the interface impedance is high, and the transmission of lithium ions between the interfaces is hindered
③Low ionic conductivity and high interface impedance lead to high internal resistance of solid-state batteries, low transmission efficiency of lithium ions inside the battery, and poorer mobility under high-rate and high-current conditions, directly affecting the energy density and power density of the battery
As a result, the chemical stability of this type of composite electrolyte is poor, and the retention rate of 0.2C cycle 100 times is about 88%, which makes it difficult to provide long-term cycle performance for the battery

Method used

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  • All-solid-state battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0058] This embodiment provides an all-solid-state battery, which includes a positive electrode, a solid electrolyte membrane, and a negative electrode;

[0059] Among them, the positive electrode is NCM811 coated with graphene, halide electrolyte Li 3 InCl 6 , conductive carbon black and polyvinylidene fluoride;

[0060] The solid electrolyte membrane is a single-layer blended electrolyte LiCl-GaF 3 ;

[0061] The negative electrode is a non-lithium metal negative electrode, polyvinylidene fluoride and a conductive agent, the non-lithium metal negative electrode is a composite of graphite, silicon oxide and silicon, and the conductive agent is a mixture of conductive carbon black, carbon nanotubes and carbon fibers;

[0062] The preparation method of the all-solid-state battery is as follows:

[0063] Combining the negative electrode sheet and the solid electrolyte membrane to obtain an integrated negative electrode / solid electrolyte membrane, then stacking the integrated...

Embodiment 2

[0074] This embodiment provides an all-solid-state battery, which includes a positive electrode, a solid electrolyte membrane, and a negative electrode;

[0075] Among them, the positive electrode is NCA (LiNi 0.8 co 1.5 Al 0.5 o 2 ), blend electrolyte LiCl-GaF 3 , conductive carbon and polyvinylidene fluoride;

[0076] The solid electrolyte membrane is a sequentially stacked blend electrolyte LiCl-GaF 3 Layers and Type 2 Sulfide Electrolytes Li 10 GeP 2 S 12 Floor;

[0077] The negative electrode is a non-lithium metal negative electrode, styrene, conductive agent and lithium salt LiTFSI, the non-lithium metal negative electrode is a composite of graphite, silicon oxide and silicon, and the conductive agent is a mixture of conductive carbon black, carbon nanotubes and carbon fibers;

[0078] The preparation method of the all-solid-state battery is as follows:

[0079] Combining the negative electrode sheet and the solid electrolyte membrane to obtain an integrated n...

Embodiment 3

[0091]This embodiment provides an all-solid-state battery, which includes a positive electrode, a solid electrolyte membrane, and a negative electrode;

[0092] Among them, the positive electrode is NCM955 coated with carbon material, halide electrolyte Li 3 ScCl 6 , conductive carbon and polyvinylidene fluoride;

[0093] like figure 1 As shown, the solid electrolyte membrane is a halide electrolyte Li stacked sequentially. 3 ScCl 6 Layer 1, Type 1 sulfide electrolyte Li 6 P.S. 5 Cl layer 2, type 2 sulfide electrolyte Li 10 GeP 2 S 12 Layer 3 and Type 3 Sulfide Electrolytes Li 6 P.S. 5 Cl layer 4;

[0094] The negative electrode is a lithium metal negative electrode, and the lithium metal negative electrode has a carbon material layer on the surface of the lithium sheet, the thickness of the lithium sheet is 20 μm, and the thickness of the carbon material layer is 10 μm;

[0095] The preparation method of the all-solid-state battery is as follows:

[0096] Combini...

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Abstract

The invention provides an all-solid-state battery and a preparation method thereof. The all-solid-state battery comprises a positive electrode, a solid electrolyte membrane and a negative electrode; the positive electrode comprises a halide solid electrolyte and / or a blended solid electrolyte; the solid electrolyte membrane comprises at least one solid electrolyte layer, the chemical formula of the blended solid electrolyte is xLiM-GaF3, wherein x is greater than or equal to 1 and less than or equal to 4, and M comprises any one or a combination of at least two of Cl, Br, O or OH. By adopting the solid electrolyte membrane composed of solid electrolyte materials with different types and functions, the cycle performance and rate capability of the all-solid-state battery are improved.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and relates to an all-solid-state battery and a preparation method thereof. Background technique [0002] Among all kinds of new battery systems, solid-state batteries are the next-generation technology closest to industrialization, which has become the consensus of the industry and the scientific community. Replacing the flammable organic liquid electrolyte with a non-flammable solid electrolyte not only greatly improves the safety of the battery system, but also better adapts to high-energy positive and negative electrodes to achieve a simultaneous increase in energy density. [0003] However, solid-state battery technology still has technical shortcomings in the following three aspects: ①The bulk ionic conductivity of current solid-state electrolytes is much lower than that of liquid electrolytes, often by several orders of magnitude. According to the choice of materials, solid-...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/0562H01M10/42H01M10/058
CPCH01M4/13H01M4/139H01M10/0562H01M10/4235H01M10/058H01M2004/028H01M2300/0068Y02P70/50Y02E60/10
Inventor 陈少杰李瑞杰黄海强王磊曹晓菊
Owner SVOLT ENERGY TECH (WUXI) CO LTD
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