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Ultrathin lithium-silver alloy strip for lithium ion battery anode and preparation method thereof

A lithium-ion battery, ultra-thin technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in preparing ultra-thin lithium strips, adhesion, etc., achieve excellent ductility, uniform thickness, and reduce damage rates Effect

Active Publication Date: 2019-09-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is carried out in order to solve the problems of sticking and difficulty in preparing ultra-thin lithium strips in the existing metal lithium strip production methods, and aims to provide an ultra-thin lithium-silver alloy strip for negative electrodes of lithium-ion batteries and a preparation method thereof

Method used

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  • Ultrathin lithium-silver alloy strip for lithium ion battery anode and preparation method thereof
  • Ultrathin lithium-silver alloy strip for lithium ion battery anode and preparation method thereof
  • Ultrathin lithium-silver alloy strip for lithium ion battery anode and preparation method thereof

Examples

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Effect test

preparation example Construction

[0042] The preparation method of the ultra-thin lithium-silver alloy ribbon for lithium-ion battery negative electrode provided by the invention comprises the following steps:

[0043] Step 1, in a first predetermined environment, heating the lithium to a predetermined temperature, so that the lithium is completely melted into liquid lithium;

[0044] Step 2, in the first predetermined environment and at a predetermined temperature, add silver to the liquid lithium according to a predetermined mass ratio, stir for a predetermined time, the silver is liquefied, and completely mixed with the liquid lithium to form a lithium-silver solid solution;

[0045] Step 3, heating is stopped, and the lithium-silver solid solution is cooled to room temperature in the first predetermined environment to obtain a solid lithium-silver solid solution block;

[0046] Step 4, in the second predetermined environment, put the lithium-silver solid solution block into a roller press and roll it to a pr...

Embodiment 1

[0058] The raw materials with a mass ratio of lithium to silver of 9:1 were put together, heated until completely melted, stirred evenly, and a 45 μm lithium-silver alloy ribbon was prepared. Use this lithium-silver alloy strip as the negative electrode, and use a standard capacity density of 3mAh cm -2 The lithium iron phosphate is used as the positive electrode, and the full battery LFP / / 9Li1Ag is assembled. After the assembled full battery LFP / / 9Li1Ag was placed for 4 hours, a constant current charge and discharge test was carried out with battery testing equipment, and the results are shown in figure 1 .

[0059] figure 1 It is a schematic diagram of the battery cycle results in Example 1 of the present invention.

[0060] Such as figure 1 As shown, the abscissa indicates the number of cycles of the full battery, and the ordinate indicates the discharge capacity density of the full battery. From figure 1 It can be seen that the first discharge capacity density of the...

Embodiment 2

[0062] The raw materials with a mass ratio of lithium to silver of 8:2 were put together, heated until completely melted, stirred evenly, and a 45 μm lithium-silver alloy ribbon was prepared. Use this lithium-silver alloy strip as the negative electrode, and use a standard capacity density of 3mAh cm -2 The lithium iron phosphate is used as the positive electrode, and the full battery LFP / / 8Li2Ag is assembled. After the assembled full battery LFP / / 8Li2Ag is placed for 4 hours, the constant current charge and discharge test is carried out with the battery test equipment, and the results are shown in figure 2 .

[0063] figure 2 It is a schematic diagram of the battery cycle results in Example 2 of the present invention.

[0064] Such as figure 2 As shown, the abscissa indicates the number of cycles of the full battery, and the ordinate indicates the discharge capacity density of the full battery. From figure 2 It can be seen that the first discharge capacity density o...

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Abstract

The invention provides an ultrathin lithium-silver alloy strip for a lithium ion battery anode and a preparation method thereof. The method comprises the steps of: heating lithium to a predetermined temperature in a first predetermined environment to completely melt the lithium into liquid lithium; adding silver to the liquid lithium according to a predetermined mass ratio in the first predetermined environment at the predetermined temperature, stirring the mixture for a predetermined time in order that the silver is liquefied to be completely uniformly mixed with the liquid lithium to form a lithium-silver solid solution; stopping heating, cooling the lithium-silver solid solution in the first predetermined environment to the room temperature so as to obtain a lithium-silver solid solution block in a solid state; and in a second predetermined environment, rolling the lithium-silver solid solution block in a roller press to a predetermined thickness to obtain a lithium-silver alloy strip of a predetermined thickness, wherein the predetermined temperature is greater than 180 degrees centigrade, and the second predetermined environment is an environment with a relative humidity of less than 10%. The lithium-silver alloy strip prepared by the method has a thickness of 4[mu]m to 200 [mu]m, a uniform thickness, good continuity, and excellent ductility.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and in particular relates to an ultra-thin lithium-silver alloy strip for negative electrodes of lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium secondary batteries, as the core components for providing power, are widely used in watches, mobile phones, notebook computers and other portable devices due to their advantages such as high working voltage, low self-discharge, large specific capacity, environmental friendliness, long cycle life and portability. Electronic equipment and aerospace and other fields. In the face of increasingly severe energy and environmental problems, the requirements for its endurance are also getting higher and higher. Therefore, it is particularly important to develop lithium-ion batteries with high specific energy, high performance and low cost. [0003] The energy density of a lithium battery depends on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525H01M4/40
CPCH01M4/405H01M4/38H01M10/0525Y02E60/10
Inventor 胥会李洒黄云辉余跃谢勇张灿陈鑫龙刘文健李伟汤卓群
Owner TONGJI UNIV
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