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secondary battery

A secondary battery and electrolyte technology, which is applied in the direction of secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of rapid battery cycle attenuation, interface fracture, etc., and achieve improved interface compatibility, good contact, and improved cycle performance Effect

Active Publication Date: 2022-05-10
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the simple physical method cannot fundamentally solve the problem of dendrite growth, and in the long cycle, the dendrites will penetrate the cracks that block the interface, etc., which will eventually lead to the breakage of the interface and the rapid attenuation of the battery cycle.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] Preparation of Li 7 La 3 Zr 2 o 12 (LLZO) particles

[0025] Will C 2 h 3 o 2 Li·2H 2 O, C 6 h 9 LaO 6 1.5H 2 O, C 8 h 12 o 8 Zr was weighed according to the molar ratio, dissolved in deionized water, and stirred ultrasonically for 1 hour. After the ultrasonic stirring was completed, the above solution was transferred to a polytetrafluoroethylene-lined stainless steel high-pressure reactor, and the reactor was placed in a dry box to heat up in a sealed manner. Heat to 80°C, keep warm for 12h, continue to heat up to 200°C, keep warm for 24h. After natural cooling, the hydrothermal product was taken out, and the hydrothermal product was centrifugally washed several times with deionized water and absolute ethanol respectively. After cleaning, it was dried at 120°C for 6 hours. After drying, the powder was calcined in a muffle furnace at 950°C for 12 hours. , and finally obtained Li with a particle size (D50) of 300nm 7 La 3 Zr 2 o 12 (LLZO) parti...

Embodiment 2

[0035] The core uses Li 6.4 Al 0.2 La 3 Zr 2 o 12 (Al-LLZO) particles, the outer shell is made of polymer PEO.

[0036] Specifically, with C 2 h 3 o 2 Li·2H 2 O, C 6 h 9 LaO 6 1.5H 2 O, C 8 h 12 o 8 Zr and Al(NO 3 ) 3 9H 2 O is raw material, prepares Li in the same manner as in Example 1 6.4 Al 0.2 La 3 Zr 2 o 12 (Al-LLZO) particles.

[0037] Add Al-LLZO and PEO into the beaker according to the mass ratio Al-LLZO:PEO=1:5, and prepare core-shell particles in the same manner as in Example 1.

[0038] Prepare the electrolyte and the modified layer in the same manner as in Example 1, and assemble the secondary battery.

Embodiment 3

[0040] The core uses Li 6.75 La 3 Zr 1.75 Nb 0.25 o 12 (Nb-LLZO) particles, the outer shell is made of poly 2-phenoxyethyl acrylate (EGPEA), and the solid electrolyte is made of Li 7 La 3 Zr 2 o 12 .

[0041] Specifically, with C 2 h 3 o 2 Li·2H 2 O, C 6 h 9 LaO 6 1.5H 2 O, C 8 h 12 o 8 Zr and niobium oxalate are raw materials, prepare Li in the same manner as in Example 1 6.75 La 3 Zr 1.75 Nb 0.25 o 12 (Nb-LLZO) particles.

[0042] Nb-LLZO and EGPEA were added into the beaker according to the mass ratio of Nb-LLZO:EGPEA=1:3, and core-shell particles were prepared in the same manner as in Example 1.

[0043] Prepare the electrolyte and the modified layer in the same manner as in Example 1, and assemble the secondary battery.

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Abstract

A secondary battery is provided, comprising an electrolyte and a negative electrode sheet, the surface of the negative electrode sheet is provided with a modified layer, the modified layer includes core-shell structure particles, the core-shell structure particles include an inner core of inorganic particles and coats the inorganic particles A polymer shell capable of conducting lithium, sodium and / or potassium ions. In the secondary battery of the present invention, a modification layer is provided on the surface of the negative electrode sheet, and the modification layer includes a rigid inner core (inorganic particles) and an elastic outer shell (polymer). Among them, the elastic shell can resist and eject the puncture of the dendrites, inhibiting the growth of the dendrites; and can recover after being deformed by the punctures of the dendrites, protecting the structure of the curved surface layer, thereby prolonging the cycle life of the battery.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and in particular relates to a secondary battery. Background technique [0002] Among many energy storage devices, lithium-ion batteries (in the form of Li + Intercalation compound as the negative electrode) and lithium batteries (with lithium metal as the negative electrode) are considered as the preferred power sources due to their high energy density, environmental friendliness, no memory effect, light weight, and small size. However, the generation of lithium dendrites at the negative electrode is a common problem at present. Severe lithium dendrites will pierce the separator and cause internal short circuit of the battery, causing thermal runaway and even explosion of the battery. [0003] Aiming at the problem of dendrites, the current modification research mainly focuses on using physical methods to inhibit the growth of dendrites, such as constructing superhard ceramic interfaces t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/058H01M10/052H01M10/0525H01M10/054
CPCH01M4/628H01M10/058H01M10/052H01M10/0525H01M10/054Y02E60/10Y02P70/50
Inventor 李旭李洋陈超曹晨王康平彭祖铃
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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