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Solid electrolyte capable of lowering interface resistance on metal lithium electrode, and preparation method for solid electrolyte

A solid electrolyte and electrode interface technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of potential safety hazards, narrow applicable temperature range, and strong side reactions between electrodes and electrolytes, etc., to achieve Effects of reduced migration resistance, low equipment requirements, and high productivity

Active Publication Date: 2016-11-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of organic liquid electrolytes in traditional lithium-ion batteries, there may be strong electrode-electrolyte side reactions, narrow applicable temperature range, and potential safety hazards.

Method used

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  • Solid electrolyte capable of lowering interface resistance on metal lithium electrode, and preparation method for solid electrolyte
  • Solid electrolyte capable of lowering interface resistance on metal lithium electrode, and preparation method for solid electrolyte
  • Solid electrolyte capable of lowering interface resistance on metal lithium electrode, and preparation method for solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Weigh lithium carbonate, lanthanum oxide, and zirconium oxide according to the stoichiometric ratio, and grind them evenly by dry grinding method, so that the mixture is fully mixed, and then placed in an alumina crucible with a cover;

[0036] The second step: put the mixture in the first step in an alumina crucible with a cover, sinter in a muffle furnace at 900°C for 6 to 12 hours, and cool to room temperature at a heating and cooling rate of 3°C / min;

[0037] The third step: transfer the reactant in the third step to an agate mortar for grinding, mix well, and record it as mother powder A;

[0038]Step 4: Grind the reactant in the third step again in an agate mortar, mix thoroughly and evenly, and add 0.1% to 0.7% halogen lithium salt, which is recorded as mother powder B;

[0039] Step 5: Add 0.5g of the mother powders A and B in the third step and the fourth step into stainless steel molds, and press them in a 20MPa press to obtain tablets C and D with a d...

Embodiment 2

[0045] The preparation method in the present embodiment is identical with embodiment 1, by figure 1 It can be seen that the lithium-containing garnet XRD prepared in Example 1 is completely consistent with the standard spectrum (JCPDS NO.45-0109), which is defined as high-purity cubic phase lithium-containing garnet; doped with halogen lithium salt Lithium-containing garnet has not changed its crystal structure, has good crystallinity and no impurities.

[0046] Depend on figure 2 It can be seen that lithium-containing garnet or lithium-halogen salt doped lithium-containing garnet has a dense structure, with a diameter of about 50-100 μm, no obvious pores, and a relative density of more than 90%, which proves that the dry grinding method combined with high-temperature solid-state sintering Non-porous lithium-containing garnet ceramic sheets were prepared by this method.

[0047] Utilize the lithium-containing garnet prepared in this embodiment 2 and the halogen lithium salt...

Embodiment 3

[0050] The preparation method in this example is the same as that in Example 1, the only difference is that the conditions in the preparation process are different, the pre-calcination reaction time in step 2 of this example is 6h, and the other conditions remain unchanged.

[0051] The phase of the lithium-containing garnet prepared in Example 3 was characterized by X-ray diffraction and other means. X-ray diffraction shows that the lithium-containing garnet obtained in Example 3 is a tetragonal phase, containing a small amount of cubic phase, and the reaction raw materials basically disappear without dense particles.

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Abstract

The invention relates to a solid electrolyte capable of lowering interface resistance on a metal lithium electrode, and a preparation method for the solid electrolyte. The preparation method comprises the steps of mixing lithium carbonate, lanthanum oxide and zirconium oxide, and uniformly grinding the mixture by a dry grinding method; then sintering the mixture in a muffle furnace, and grinding to obtain mother powder, and tabletting the mother powder; putting the tablet-shaped material into a crucible with a cover; then performing mother powder filling and sintering in the muffle furnace to obtain the compact ceramic sheet; and polishing the ceramic sheet until the surface of the ceramic sheet is smooth to obtain the solid electrolyte. Compared with the prior art, the electrolyte prepared by the method has the advantages of absence of impure phase on the surface, high relative density, low interface resistance on the metal lithium electrode, and the like.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a solid electrolyte that reduces the interface resistance with a metal lithium electrode and a preparation method thereof. Background technique [0002] Since the birth of lithium-ion batteries, the energy density of batteries has increased by nearly 2 times. Lithium-ion batteries are now more and more widely used in aerospace and military fields as a chemical energy storage method because of their light weight, high specific energy / specific power, long life, and no memory effect. For example, the quality of a lithium-ion battery is only half that of a nickel-hydrogen battery of the same capacity, and its volume is 20% to 30% smaller than the latter. [0003] With the development of the aviation field, the requirements for space power supply are getting higher and higher. For example, the power supply needs to withstand the acceleration of gravity of nearly 10g when the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562
CPCH01M10/0562H01M2300/0085Y02E60/10
Inventor 段华南徐比翼刘河洲郭益平康红梅李华
Owner SHANGHAI JIAO TONG UNIV
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