Method for preparing liquid metal nano-particles and method for preparing lithium ion batteries

A lithium-ion battery and liquid metal technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity, low energy density, and poor performance of large rate of electrode materials, and achieve improved conductivity and high energy density. , Increase the effect of cycle life and stability

Inactive Publication Date: 2018-09-14
武汉新能源研究院有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, lithium-ion batteries are also facing problems such as poor conductivity of electrode materials, low energy density, and poor high-rate performance.

Method used

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  • Method for preparing liquid metal nano-particles and method for preparing lithium ion batteries
  • Method for preparing liquid metal nano-particles and method for preparing lithium ion batteries
  • Method for preparing liquid metal nano-particles and method for preparing lithium ion batteries

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preparation example Construction

[0028] A preparation method of liquid metal nanoparticles, comprising the following steps:

[0029] Step S1: mixing liquid metal alloy (LM), ethanol solution and dodecanethiol to form a mixture I, and ultrasonically degrading the mixture I;

[0030] Step S2: The mixture I was left to stand for 2h-4h, then filtered and dried to obtain liquid metal nanoparticles. The physical picture of liquid metal nanoparticles figure 2 shown.

[0031] Further: the preparation method of the liquid metal alloy described in the step S1 is:

[0032] Step S11: weighing molten metal Ga and molten metal Sn in a beaker with a mass ratio of 22:3;

[0033] Step S12: stirring the metal Ga and the metal Sn in the beaker for 1.5h-2.5h, and after cooling down to room temperature, a liquid metal alloy is obtained. The physical picture of the liquid metal alloy figure 1 shown.

[0034] Further: the specific implementation of the sonication in the step S1 is as follows: taking the ultrasonic wave to ac...

Embodiment 1

[0042] Example 1. Metal Ga and metal Sn were melted at a high temperature of 300°C, and the molten metal Ga and metal Sn were weighed in a beaker according to a mass ratio of 22:3, and stirred gently for 2 hours under an argon atmosphere. After cooling to room temperature, a liquid metal alloy is obtained;

[0043] Weigh 0.18g liquid metal alloy, add 0.75mL ethanol solution, and add 0.2024g dodecanethiol as a surfactant at the same time to form a mixture I, carry out ultrasonic degradation to the mixture I, and rest for ten minutes every two minutes with ultrasonic waves. Once every minute, repeat fifteen times; then stand still for 3 hours, filter, and dry at 50°C to obtain liquid metal nanoparticles;

[0044] Weigh commercial sulfur, liquid metal nanoparticles, acetylene black and PVDF at a mass ratio of 8:2:1:1 to make positive plates, use lithium plates as counter electrodes, use electrolyte salts and organic solvents as electrolytes, and use Celgard2400 as separators In ...

Embodiment 2

[0046] Example 2. Metal Ga and metal Sn were melted at a high temperature of 300°C, and the molten metal Ga and metal Sn were weighed in a beaker according to a mass ratio of 22:3, and stirred gently for 2 hours under an argon atmosphere. After cooling to room temperature, a liquid metal alloy is obtained;

[0047] Weigh 0.18g liquid metal alloy, add 0.75mL ethanol solution, and add 0.2024g dodecanethiol as a surfactant at the same time to form a mixture I, carry out ultrasonic degradation to the mixture I, and rest for ten minutes every two minutes with ultrasonic waves. Once every minute, repeat fifteen times; then stand still for 3 hours, filter, and dry at 50°C to obtain liquid metal nanoparticles;

[0048] Weigh commercial lithium titanate, liquid metal nanoparticles, acetylene black, and PVDF at a mass ratio of 8:2:1:1 to make negative electrodes, use lithium sheets as counter electrodes, use electrolyte salts and organic solvents as electrolytes, and use Celgard 2400 i...

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Abstract

The invention relates to a method for preparing liquid metal nano-particles and a method for preparing lithium ion batteries. The method for preparing the liquid metal nano-particles includes steps ofS1, mixing liquid metal alloy, ethyl alcohol solution and dodecyl mercaptan to obtain mixtures I and ultrasonically degrading the mixtures I; S2, allowing the mixtures I to stand still for 2-4 h, andthen filtering and drying the mixtures I to obtain the liquid metal nano-particles. The methods have the advantages that the electric conductivity of the lithium ion batteries with added liquid metalcan be greatly improved, and the liquid metal is high in energy density, can be used as an electrode material additive to provide extra capacity to the lithium ion batteries, and is a perfect material for lithium batteries with high energy density; the lithium ion batteries are little in damage in high-rate charge and discharge procedures owing to the excellent self-healing ability of the liquidmetal, the lithium ion batteries are excellent in high-rate performance as compared with pure lithium titanate batteries, the cycle lives of the lithium ion batteries can be prolonged, and the stability of the lithium ion batteries can be improved.

Description

technical field [0001] The invention belongs to the technical field of green energy storage, and in particular relates to a preparation method of liquid metal nanoparticles and a preparation method of a lithium ion battery. Background technique [0002] In 1991, under the impetus of Sony Corporation, lithium-ion batteries became the first commercialized lithium secondary batteries. Compared with traditional secondary batteries, lithium-ion batteries have lighter weight and higher energy storage density. This feature makes it gradually replace nickel metal hydride batteries in the consumer electronics market, and begins to replace nickel metal hydride and nickel chromium batteries in the power tool market. In recent years, it has become more popular in the field of electric vehicles and hybrid vehicles. However, lithium-ion batteries are also facing problems such as poor conductivity of electrode materials, low energy density, and poor high-rate performance. Contents of t...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/36H01M10/0525
CPCH01M4/36H01M4/38H01M10/0525Y02E60/10
Inventor 曹元成程时杰
Owner 武汉新能源研究院有限公司
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