Lithium metal negative electrode of hollow carbon spheres loaded with silver particles and solid-state battery

A lithium metal negative electrode and hollow carbon sphere technology, which is applied in the direction of lithium batteries, battery electrodes, metal processing equipment, etc., can solve the problems of lithium dendrite growth, uneven contact, interface side reactions, etc., and achieve simple preparation process and process, The effect of suppressing reverse "piercing through" and low material cost

Pending Publication Date: 2022-04-05
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the research of solid-state batteries based on garnet-type solid electrolytes, there are challenges such as limited solid-solid contact area, stress failure, and interface side reactions at the interface between the solid-state electrolyte and the electrode, which seriously affect the battery's Coulombic efficiency, cycle and rate performance. , the interface problem mainly comes from the uneven contact between the electrolyte and the electrode, resulting in the growth of lithium dendrites and the short circuit of the battery

Method used

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  • Lithium metal negative electrode of hollow carbon spheres loaded with silver particles and solid-state battery
  • Lithium metal negative electrode of hollow carbon spheres loaded with silver particles and solid-state battery
  • Lithium metal negative electrode of hollow carbon spheres loaded with silver particles and solid-state battery

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preparation example Construction

[0033] A method for preparing hollow carbon spheres loaded with silver particles according to the present invention, such as figure 1 As shown, the steps include:

[0034] 1) adding tetraethyl orthosilicate to a mixed solution of isopropanol and water for hydrolysis and polycondensation reaction to obtain silica spheres;

[0035] 2) Using the above-mentioned silica spheres as a template, using isopropanol and an aminosilane coupling agent to carry out amino functionalization on the silica spheres in the step 1 to obtain aminated silica spheres;

[0036] 3) preparing silver nano-sol;

[0037] 4) mixing the aminated silica spheres obtained in step 2 with the silver nanoparticle sol prepared in step 3, centrifuging the spheres, and finally cleaning to obtain silica spheres loaded with silver nanoparticles SiO 2 @Ag;

[0038] 5) Using resorcinol and formaldehyde solution as the precursor of the carbon source to the silica spheres SiO loaded with silver nanoparticles 2 @Ag und...

Embodiment 1

[0046] The specific preparation process of the hollow carbon spheres loaded with silver particles described in this example is as follows:

[0047] 1) Preparation of silica template: Add 8 mL of tetraethyl orthosilicate (TEOS) to a mixed solution of 80 mL of isopropanol and 12 mL of deionized water, and add 8 mL of ammonia water (25% by mass fraction, The same below) reacted for 2 hours, centrifuged and cleaned and separated, and the obtained solid was centrifuged and washed three times through isopropanol / deionized water / deionized water, and samples were collected to obtain silica spheres with a diameter of about 440nm and good dispersion.

[0048] 2) Preparation of amino-functionalized silica spheres: take the silica spheres obtained in step 1), disperse them in 100 mL of isopropanol, and then add 1 mL of 3-aminopropyltriethoxysilane (99% mass fraction , the same below) was stirred in a water bath at 60° C. for 10 h, and then the obtained solid was centrifuged with isopropan...

Embodiment 2

[0055] In this example, in-situ transmission was used to characterize the mechanism of action of silver-loaded hollow carbon spheres Ag@C in solid-state batteries, and to guide the deposition of lithium dendrites. The positive electrode of the in-situ transmission platform was built with Cu electrodes, and a large amount of Cu electrodes were attached to the Cu electrodes. Lithium and garnet-type solid-state electrolyte Li with particles half-embedded in lithium 6.4 La 3 Zr 1.4 Ta 0.6 o 12 (LLZTO), the negative electrode uses a W electrode, and the hollow carbon sphere Ag@C prepared in Example 1 is attached to the W electrode as a three-dimensional carbon-based framework material, and an external power supply is connected to form a closed loop, and a certain voltage is applied , garnet-type solid electrolyte Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 (LLZTO) provides a transport channel for lithium ions, and after reaching the three-dimensional carbon-based framework layer, electr...

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Abstract

According to the lithium metal negative electrode of the hollow carbon sphere loaded with the silver particles and the solid-state battery, the carbon wall of the hollow carbon sphere is formed by amorphous carbon, the thickness of the carbon wall is 6-15 nm, the diameter of a hollow inner cavity of the hollow carbon sphere is 400-700 nm, the silver particles are loaded on the inner wall of the hollow carbon sphere, and the diameter of the silver particles is 5-20 nm. Silver particles are loaded on amino-functionalized silicon dioxide spheres, then resorcinol and formaldehyde are used as carbon source precursors, phenolic resin coating is carried out, finally calcination is carried out, silicon dioxide sphere templates are removed through hydrofluoric acid etching, and the prepared product is obtained. The hollow carbon sphere loaded with the silver particles serves as a three-dimensional framework, provides an electron ion channel, can effectively guarantee reversibility of lithium ion intercalation and deintercalation, does not generate inactive lithium, plays a stress buffering role in the cycle process of a solid-state battery, further effectively limits volume expansion generated in the cycle process of the solid-state battery, and improves the performance of the solid-state battery. And the safety of the battery is improved.

Description

technical field [0001] The invention relates to the field of solid-state lithium metal battery materials, in particular to a lithium metal negative electrode of hollow carbon spheres loaded with silver particles and a solid-state battery. Background technique [0002] With the development of advanced energy storage technology, compared with traditional liquid lithium metal batteries, lithium metal solid-state batteries use non-flammable solid-state electrolytes as electrolytes and lithium metal as negative electrodes, which have high energy density and high safety, and are expected to replace existing liquid lithium-ion battery. Solid electrolyte, as the medium for lithium ion migration, is the core of solid-state batteries. Solid electrolytes can be divided into polymer systems, and their room temperature conductivity is about 10 -7 ~10 -5 S / cm; oxide system, its conductivity at room temperature is 10 -6 ~10 -3 S / cm; sulfide system, its conductivity at room temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/052C01B32/15B22F1/18B22F1/16B82Y40/00B82Y30/00
CPCY02E60/10
Inventor 王鸣生李旺琴高浩文
Owner XIAMEN UNIV
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