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Composite solid electrolyte, preparation method thereof and lithium storage battery

A solid electrolyte, electrolyte membrane technology, applied in the direction of electrolyte immobilization/gelation, secondary batteries, circuits, etc., can solve the problem of reducing the cycle life and cycle performance of lithium batteries, limited improvement of battery short-circuit protection, and poor metal lithium deposition. Uniform aggravation and other problems, to achieve the effect of light weight, prevention of lithium dendrite puncture, and strong mechanical integrity

Pending Publication Date: 2021-03-12
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This new type of filler can not only improve the electrical conductivity of PEO but also increase its mechanical strength, however, the aggregation of nano-ceramic particles will lead to a decrease in lithium-ion conductivity
In addition, when the mechanical strength is increased, transition metal ions are introduced and some transition metal ions are transported in the amorphous region, resulting in Li + The transfer is uneven, the deposition of lithium metal is uneven, and the formation rate of lithium dendrites on the negative electrode is accelerated. Lithium dendrites are easy to puncture and detach from the solid electrolyte film to form "dead lithium", which reduces the cycle life and cycle performance of lithium batteries, and protects batteries from short circuits. The performance improvement is limited, and even under some other parameters, the short-circuit protection is even worse
[0006] Therefore, for PEO polymeric solid electrolytes, its high crystallinity leads to low ionic conductivity, poor mechanical properties and low withstand voltage, which limits its application and application effect.

Method used

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  • Composite solid electrolyte, preparation method thereof and lithium storage battery
  • Composite solid electrolyte, preparation method thereof and lithium storage battery
  • Composite solid electrolyte, preparation method thereof and lithium storage battery

Examples

Experimental program
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Effect test

preparation example Construction

[0050] The preparation method of the composite solid electrolyte includes the following steps:

[0051] S1: Electron beam thermal deposition system is used to plate lithium onto the surface of the lithium source carrier film in vacuum, forming a thin lithium layer on the surface of the lithium source carrier film. The lithium source carrier film can be determined according to the situation, here is copper foil;

[0052] S2: The electrolyte membrane layer on the negative electrode side is made of PEO solid electrolyte, and one side of the electrolyte membrane layer on the negative electrode side is pre-coated with an infiltration solution, which is one of tetrahydrofuran, ethylene glycol dimethyl ether (DME), and acetonitrile (ACN). Lay the side of the lithium source carrier film with the lithium thin layer and the side of the electrolyte film layer on the negative electrode side coated with the immersion solution, heat and press the two rolls, and the pressure on the roll is 0....

Embodiment 1-6

[0057] The composite solid electrolyte was prepared according to the above preparation method, and Examples 1-6 were obtained, and the specific parameters of Examples 1-6 are shown in Table 1.

[0058] Table 1. The concrete parameter table of embodiment 1-6

[0059] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Electrolyte layer thickness on the negative electrode side / μm 6 10 8 10 6 5 Electrolyte layer thickness on positive electrode side / μm 4 10 10 9 6.5 5 Thickness of ion dispersion layer / μm 2 5 3 0.8 1 0.5 Roll pressure / kgf·cm -2

Embodiment 7

[0093] A composite solid electrolyte, based on the basis of Example 1, the difference is that the electrolyte membrane layer on the positive electrode side is a PEO solid electrolyte membrane.

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Abstract

The invention relates to a solid electrolyte, and discloses a composite solid electrolyte and a preparation method thereof, and a lithium storage battery. The composite solid electrolyte comprises a negative electrode side electrolyte layer, an ion dispersion layer and a positive electrode side electrolyte layer which are sequentially attached and compressed, the negative electrode side electrolyte layer is a PEO electrolyte membrane layer, the ion dispersion layer is Li3N, the positive electrode side electrolyte layer is a polymer solid electrolyte membrane layer, so that the lithium ion conductivity of the composite electrolyte is improved, the deposition uniformity of lithium ions in the charging process is improved, the lithium dendritic crystal forming rate is low, the cycle life of the lithium metal negative electrode is prolonged, and the cycle life of solid-state lithium storage is further prolonged; and the material still has a relatively high performance retention rate aftermultiple cycles.

Description

technical field [0001] The invention relates to a solid electrolyte, in particular to a composite solid electrolyte, a preparation method thereof and a lithium accumulator. Background technique [0002] As a chemical power source with high specific energy, lithium-ion battery is widely used in energy, transportation, communication, electric tools and other fields. Lithium-ion batteries have been commercialized since 1991 and have been used on a large scale. During this process, they have been accompanied by continuous development—from electrolytes with lower safety to solid electrolytes with higher safety today. The commonly used solid electrolytes are divided into polymer solid electrolytes (SPE) and inorganic solid electrolytes. [0003] Polymer solid electrolyte (SPE) is a kind of solid substance obtained by blending, plasticizing, and compounding inorganic substances with polymer as the matrix. At present, there are five types of polymerization based on polyethylene ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M2300/0085Y02E60/10
Inventor 许晓雄崔言明龚和澜彭振
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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