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Lithium metaaluminate coated aluminum lithium alloy composite material and preparation method of lithium sulphur battery

A technology of lithium metaaluminate and composite materials, which is applied in lithium batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of poor cycle performance of lithium-ion batteries, cracks and pulverization of alloys, and loss of reversible lithium storage. Achieve good chemical stability and thermal stability, stable charge and discharge voltage platform, and be conducive to the effect of electrode processing

Inactive Publication Date: 2014-11-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems faced by metal aluminum anode materials are: (1) Al-Li alloy is extremely active and easily oxidized in the air
(2) During the charge-discharge cycle, the reversible formation and decomposition of the Al-Li alloy is accompanied by a greater volume change, which leads to the alloy being more prone to cracks and pulverization, which increases the contact resistance, causes irreversible capacity loss, and even loses the reversible storage capacity. The effect of lithium will eventually lead to electrode failure, so the cycle performance of lithium-ion batteries purely using aluminum as the negative electrode material is very poor
Moreover, aluminum-lithium alloys are quite active, and it is difficult to coat aluminum-lithium alloy particles with conventional technical means.

Method used

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  • Lithium metaaluminate coated aluminum lithium alloy composite material and preparation method of lithium sulphur battery

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preparation example Construction

[0030] The preparation method of lithium metaaluminate-coated aluminum-lithium alloy composite material specifically comprises the following steps: in an argon-protected glove box, after mechanically mixing spherical aluminum powder and lithium source compound powder, sealing them in a 316 stainless steel Then remove the reactor from the glove box, heat the reactor to 350-600°C, react in vacuum for 1-2 hours, then cool to 10-30°C to obtain aluminum-lithium alloy composite powder coated with lithium metaaluminate;

[0031] Among them, in the spherical aluminum powder and the lithium source compound powder, the molar ratio of aluminum element to lithium element is 1:1, and the purity of the spherical aluminum powder is 99.99%, and the particle size is 1-20 microns; the lithium source compound is oxidized Lithium or lithium compounds (lithium hydroxide, lithium carbonate) that can be decomposed by heating to obtain lithium oxide. If the diameter of the spherical aluminum powder i...

Embodiment 1

[0039] Example 1 Lithium oxide is used as raw material to prepare lithium metaaluminate-coated aluminum-lithium alloy composite material

[0040] In an argon protective glove box, spherical aluminum powder (1 mole of aluminum: 27g) with a purity of 99.99% and a particle size of 1-10 microns and lithium oxide (Li 2 O) Powder (0.5 mole of lithium oxide: 15g, containing 1 mole of lithium element) is mechanically mixed evenly and sealed in a 316 stainless steel reactor; remove the reactor from the glove box, heat the reactor to 350°C, react in vacuum for 1 hour and then cool to 10° C. to obtain a lithium metaaluminate-coated aluminum-lithium alloy composite material.

Embodiment 2

[0041] Example 2 Lithium hydroxide is used as raw material to prepare lithium metaaluminate-coated aluminum-lithium alloy composite material

[0042] In an argon protective glove box, mechanically mix spherical aluminum powder (1 mole of aluminum: 27g) and lithium hydroxide powder (1 mole of lithium hydroxide: 24g) with a purity of 99.99% and a particle size of 5 to 15 microns Sealed in a 316 stainless steel reactor; remove the reactor from the glove box, heat the reactor to 540°C, react in vacuum for 1.5 hours and then cool to 20°C to obtain a lithium metaaluminate-coated aluminum-lithium alloy composite material.

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Abstract

The invention relates to the technical field of lithium ion batteries and provides a lithium metaaluminate coated aluminum lithium alloy composite material and a preparation method of a lithium sulphur battery. A preparation method of the lithium metaaluminate coated aluminum lithium alloy composite material comprises the following steps: mixing spherical aluminum powder and lithium resource compound powder, and heating to obtain lithium metaaluminate coated aluminum lithium alloy composite material powder; the lithium sulphur battery comprises a diaphragm, a positive electrode, a negative electrode and electrolyte; and the negative electrode material of the negative electrode comprises the lithium metaaluminate coated aluminum lithium alloy composite material. The prepared lithium metaaluminate coated aluminum lithium alloy composite material has a stable charging and discharging voltage platform, so that organic electrolyte can be safely applied to the battery; the composite material has good electrode reaction reversibility and good chemical stability and thermal stability, lithium dendrites can be avoided in the lithium sulphur battery, and short circuit can be effectively prevented, so that the reliability and the safety of the lithium sulphur battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium metaaluminate-coated aluminum-lithium alloy composite material and a preparation method for a lithium-sulfur battery. Background technique [0002] Lithium-ion battery is a secondary battery that can be charged and discharged multiple times. Generally, it uses graphite as the negative electrode material, lithium alloy metal oxide as the positive electrode material, and a non-aqueous electrolyte battery. [0003] The reaction that occurs on the charging negative electrode is: 6C+x Li + +x e - = Li x C 6 , the reaction that occurs on the charged positive electrode is: LiCoO 2 = Li 1-x CoO 2 +x Li + +x e - , the total reaction of the rechargeable battery: LiCoO 2 +6C=Li 1-x CoO 2 +Li x C 6 . [0004] When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negati...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/134H01M4/1395
CPCH01M4/366H01M4/463H01M10/052Y02E60/10
Inventor 李洲鹏汪倩倩刘宾虹
Owner ZHEJIANG UNIV
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