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Metal lithium composite material and preparation method thereof

A composite material and lithium metal technology, which is applied in electrode manufacturing, electrode rolling/calendering, electrode heat treatment, etc., can solve the problems of difficult processing, lithium composite electrodes, and low coulombic efficiency of lithium metal negative electrodes.

Inactive Publication Date: 2020-12-18
SAIC MOTOR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, during the cycle, the metal lithium anode is easy to react with the electrolyte, and the lithium metal anode is easily pulverized due to uneven deposition of lithium, resulting in low coulombic efficiency of the lithium metal anode.
[0005] At the same time, because lithium metal is very active and difficult to process, it is difficult to produce lithium composite electrodes with controllable surface capacity.

Method used

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  • Metal lithium composite material and preparation method thereof
  • Metal lithium composite material and preparation method thereof
  • Metal lithium composite material and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a method for preparing the above-mentioned metal composite material, comprising: S1) heating and mixing the lithium-philic oxide and pure lithium, and rolling after cooling to obtain metal lithium modified foil; An organic solution containing a metal salt is soaked to obtain a treated three-dimensional conductive material; the metal salt is selected from one or more of aluminum salts, tin salts, antimony salts, zinc salts, and magnesium salts; S2) the After the metal lithium modified foil is mechanically combined with the treated three-dimensional conductive material, heat treatment is carried out in a protective atmosphere; the metal lithium composite material is obtained.

[0037]On the one hand, the present invention modifies pure metallic lithium into metallic lithium by adding lithium-philic oxides to introduce more active sites during the cycle, improve its cycle performance, and enhance its electrochemical stability. On the othe...

Embodiment 1

[0049] Pure lithium and tin dioxide are mixed at a mass ratio of 1:0.5 at 250°C for a uniform time (30 minutes). After cooling, they are rolled into metal lithium modified foils by mechanical rolling.

[0050] A three-dimensional conductive carbon cloth with a porosity of 50% and a thickness of 150 μm is used.

[0051] Using a concentration of 0.1mol / L SbCl 3 The above-mentioned three-dimensional conductive carbon cloth is soaked in ethanol solution for 10mins, and dried, wherein SbCl 3 The mass ratio of the salt mass to the carbon cloth material is 0.5, and a three-dimensional conductive carbon cloth after soaking is obtained.

[0052] The soaked three-dimensional conductive carbon cloth was heat-treated at 300° C. for 30 minutes in an air environment to obtain a heat-treated three-dimensional conductive carbon cloth.

[0053] Set the areal density to 5mg / cm 2 The lithium foil is pasted on the three-dimensional conductive carbon cloth after the heat treatment, the mass rat...

Embodiment 2

[0061] Mix pure lithium and silicon dioxide at a mass ratio of 1:1, heat and mix evenly at 350°C (time 20min), and after cooling, roll it into metal lithium modified foil.

[0062] A three-dimensional conductive copper mesh with a porosity of 30% and a thickness of 500 μm is used.

[0063] With a concentration of 1mol / L Al(NO 3 ) 2 The above-mentioned three-dimensional conductive copper mesh is soaked in acetone solution, soaked for 1h, and then dried to obtain the three-dimensional conductive copper mesh after the soaking treatment, wherein Al(NO 3 ) 2 The mass ratio of salt mass to carbon cloth material is 1.

[0064] The three-dimensional conductive copper mesh after the soaking treatment was heat-treated at 400° C. for 120 minutes in an argon atmosphere to obtain a heat-treated three-dimensional conductive copper mesh.

[0065] Set the areal density to 10mg / cm 2The metal lithium modified foil material is pasted on the three-dimensional conductive copper mesh after the...

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Abstract

The invention provides a preparation method of a metal lithium composite material. The method comprises the following steps: S1) heating and mixing a lithium-philic oxide and pure lithium, cooling, and rolling to obtain a metal lithium modified foil; soaking a three-dimensional conductive material in an organic solution containing metal salt to obtain a treated three-dimensional conductive material; and S2) mechanically compounding the metal lithium modified foil with the treated three-dimensional conductive material, and carrying out heat treatment in a protective atmosphere to obtain the metal lithium composite material. Compared with the prior art, the lithium-philic material capable of improving metal lithium negative electrode circulation is mixed into pure lithium in advance, the prepared metal lithium composite material can be directly used as a lithium battery negative electrode, the use efficiency of metal lithium is improved, structural support is provided, pulverization of metal lithium in a circulation process is prevented, and circulation performance of the battery is improved; and an interface lithium ion transmission impedance can be reduced, and battery polarizationis effectively decreased.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a metal composite material and a preparation method thereof. Background technique [0002] Due to the increasing requirements for the energy density of lithium-ion batteries in the fields of consumer electronics, energy storage and new energy vehicles, my country and other countries in the world have proposed plans to increase the energy density of lithium-ion batteries, which have high energy density and high energy density. There is an urgent need for the development of lithium-ion batteries with safe performance. [0003] At present, due to its extremely high theoretical specific capacity (3860mAh / g), low electrode potential (-3.04vs. SHE (standard hydrogen potential)) and relatively low density (0.53g / cm 3 ), metal lithium is considered by the industry to be the ultimate solution for high energy density batteries. [0004] However, during the cycle,...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M4/36H01M4/38H01M4/62H01M4/74H01M4/80H01M10/0525
CPCH01M4/0435H01M4/0471H01M4/134H01M4/1395H01M4/362H01M4/382H01M4/62H01M4/74H01M4/745H01M4/747H01M4/808H01M10/0525Y02E60/10
Inventor 朱冠楠段建冯奇罗巍孙亮黄云辉
Owner SAIC MOTOR
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