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A lithium ion conductor composite lithium alloy negative electrode material and its preparation method and application

A technology of conductor compounding and negative electrode materials, applied in the direction of negative electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of lithium dendrite growth, unstable lithium-electrolyte interface, high overpotential, etc., achieve wide application prospects, and ease cycle performance Effect of drop, good cycle performance

Active Publication Date: 2022-04-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The primary purpose of the present invention is to overcome the problem of lithium dendrite growth caused by uneven deposition of lithium metal during deposition-dissolution of the lithium metal negative electrode, and the problem that the lithium-electrolyte interface is unstable and the overpotential is too high during charging and discharging, providing A preparation method of a lithium ion conductor composite lithium alloy negative electrode material

Method used

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  • A lithium ion conductor composite lithium alloy negative electrode material and its preparation method and application
  • A lithium ion conductor composite lithium alloy negative electrode material and its preparation method and application
  • A lithium ion conductor composite lithium alloy negative electrode material and its preparation method and application

Examples

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Embodiment 1

[0035] A preparation method of polyanionic compound lithium magnesium phosphate nanoparticles, comprising the following steps:

[0036] Dissolve 284.5 mg of magnesium acetate, 230 mg of ammonium dihydrogen phosphate, and 132 mg of lithium acetate in a mixed solvent of 25 mL of tetraethylene glycol and 25 mL of oleylamine. The solution was placed in a round-bottomed flask with an air condensing reflux device and heated to solvent reflux (about 270-320° C.) for 12 hours, then the heating was stopped and allowed to cool naturally to obtain a suspension of nanoparticles of the polyanionic compound magnesium lithium phosphate. Cloudy liquid. The suspension was centrifuged, washed three times with ethanol and acetone to remove high-boiling organic solvents, and vacuum-dried at 45° C. for 8 hours to obtain polyanionic lithium magnesium phosphate nanoparticles.

Embodiment 2

[0038] This embodiment is the second embodiment of the present invention. The difference from Example 1 is that this embodiment uses silver acetate as the metal salt, ammonium sulfate as the oxoacid ammonium salt, and lithium acetate as the lithium source to prepare the polyanionic compound sulfuric acid. Silver lithium nanoparticles.

Embodiment 3

[0040] This example is the third example of the present invention. The difference from Example 1 is that this example uses zinc acetate as the metal salt, ammonium dihydrogen phosphate as the oxoacid ammonium salt, and lithium acetate as the lithium source to prepare the polyanion type Compound lithium zinc phosphate nanoparticles.

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Abstract

The invention discloses a lithium ion conductor composite lithium alloy negative electrode material and its preparation method and application. The preparation method comprises the following steps: mixing polyanionic compound nanoparticles with lithium metal, and heating the mixture under an inert atmosphere To a molten state, react for 1 to 48 hours to obtain a lithium ion conductor composite lithium alloy negative electrode material; the mass ratio of lithium metal to polyanionic compound nanoparticles is 1: (0.1 to 1). Compared with the traditional pure lithium negative electrode, the lithium alloy negative electrode material of the present invention has high rate performance and good cycle performance, and can be applied to energy storage systems such as lithium metal batteries and solid-state batteries.

Description

technical field [0001] The invention relates to the field of lithium metal negative electrode materials, and more specifically, relates to a lithium ion conductor composite lithium alloy negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries currently occupy a huge market share in consumer electronics, electric vehicles and other fields. The anode materials of lithium-ion batteries are mainly graphite (372mAh / g) and silicon-carbon composite materials (~1500mAh / g), and their specific capacity is lower than that of lithium metal anodes (theoretical value 3860mAh / g). However, the chemical activity of lithium metal itself is relatively high, and lithium dendrites are easily generated during the deposition / dissolution process of lithium metal, which causes side reactions between lithium metal and electrolyte, and the problem of dendritic puncture short circuit. These issues make Li metal anodes difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/134H01M4/1395H01M4/36H01M4/58H01M4/02
CPCH01M4/0471H01M4/134H01M4/1395H01M4/364H01M4/5825H01M2004/027Y02E60/10
Inventor 朱昌宝彭琨尧
Owner SUN YAT SEN UNIV