Preparation method of lithium-free flexible electrode by using ion exchange method

An ion exchange method and flexible electrode technology, applied in the direction of active material electrodes, positive electrodes, battery electrodes, etc., can solve the problems of restricting the development of flexible electrodes, poor ion diffusion rate, and low electronic conductivity, so as to improve electrical properties and conduct electricity. The effect of enhancing the effect and reducing the effect of side effects

Pending Publication Date: 2021-09-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the huge volume change of transition metal compounds during charging and discharging, which leads to problems such as structural collapse, low electronic conductivity, and poor ion diffusion rate, the further development of such flexible electrodes is limited.

Method used

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  • Preparation method of lithium-free flexible electrode by using ion exchange method
  • Preparation method of lithium-free flexible electrode by using ion exchange method
  • Preparation method of lithium-free flexible electrode by using ion exchange method

Examples

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preparation example Construction

[0034] The invention provides a method for preparing a lithium-free flexible electrode by an ion exchange method, comprising the following steps:

[0035] S1. Deposit magnesium hydroxide on carbon cloth by electrochemical deposition to obtain a magnesium hydroxide-carbon cloth composite;

[0036] S2. Immerse the magnesium hydroxide-carbon cloth composite obtained in step S1 into an aqueous glucose solution and perform hydrothermal treatment; then wash and dry the product obtained after the hydrothermal treatment and perform high-temperature carbonization treatment to obtain carbon-coated Magnesium oxide-carbon cloth composite;

[0037] S3. Immerse the carbon-coated magnesium oxide-carbon cloth composite obtained in step S2 into a nickel salt solution to perform an ion exchange reaction; then wash and dry the product of the ion exchange reaction and then calcine it under an inert atmosphere processed to obtain flexible electrodes.

[0038] In step S1, the deposition of magnes...

Embodiment 1

[0045] This embodiment provides a method for preparing a lithium-free flexible electrode by ion exchange, including the following steps:

[0046] S1, preparation of magnesium hydroxide-carbon cloth composite (Mg(OH) 2 -CC)

[0047] A standard two-electrode electrodeposition system was adopted, with platinum sheet and carbon cloth as the counter electrode and working electrode, respectively, and Mg(NO 3 ) 2 ·6H 2 O aqueous solution was used as the electrolyte, under the conditions of 0V and -24mA, the carbon cloth was deposited at room temperature for 1 h, and the carbon cloth was washed three times with distilled water, and then dried in an oven at 70 °C for 12 h to obtain the magnesium hydroxide-carbon cloth composite. substance, denoted as Mg(OH) 2 -CC.

[0048] S2. Preparation of carbon-coated magnesium oxide-carbon cloth composite (C@MgO-CC)

[0049] The magnesium hydroxide-carbon cloth composite obtained in step S1 was placed in a 50 mL autoclave containing 40 mL of...

Embodiment 2～5

[0073] Examples 2 to 5 respectively provide a method for preparing lithium-free flexible electrodes by ion exchange. Compared with Example 1, the difference is that the process parameters in steps S2 and S3 are changed. The process parameters corresponding to each embodiment are as follows: As shown in Table 1, the rest of the steps are consistent with those in Example 1, and will not be repeated here.

[0074] The processing parameter of table 1 embodiment 2~5

[0075]

[0076] Detecting the flexible electrodes prepared in Examples 2 to 5, it can be found that their morphology and electrical properties are basically the same as those in Example 1, indicating that the process parameters of each step can be properly adjusted within a certain range, and the obtained products can be used as high-quality electrodes. Flexible electrodes with high capacity are used in flexible lithium-ion batteries, which can meet the needs of actual production and application, and have a good ap...

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Abstract

The invention provides a preparation method of a lithium-free flexible electrode by using an ion exchange method. The preparation method comprises the following steps of: depositing magnesium hydroxide on carbon cloth by adopting an electrochemical deposition method to prepare a magnesium hydroxide-carbon cloth compound; taking glucose as a carbon source, forming a carbon coating layer through hydrothermal treatment and high-temperature carbonization treatment, and dehydrating the magnesium hydroxide into magnesium oxide through high-temperature carbonization treatment to obtain a carbon-coated magnesium oxide-carbon cloth compound; and carrying out ion exchange reaction and dehydration treatment on the carbon-coated magnesium oxide-carbon cloth compound to convert the carbon-coated magnesium oxide-carbon cloth compound into a carbon-coated nickel oxide-carbon cloth compound, thereby acquiring the flexible electrode material with high capacity. In the mode, the loading capacity of active substances on the surface of the carbon cloth can be improved while a lossless and compact carbon coating layer is formed, and the influence of a high-temperature carbonization process on nickel oxide is effectively avoided, so that the prepared flexible electrode has relatively high conductivity and specific capacity and has important significance on the design of a high-capacity flexible battery system.

Description

technical field [0001] The invention relates to the technical field of flexible electrodes, in particular to a method for preparing lithium-free flexible electrodes by an ion exchange method. Background technique [0002] Flexible lithium-ion batteries have excellent electrochemical energy storage capacity and mechanical stability, and play a pivotal role in smart portable microdevices. As a state-of-the-art energy storage device, the electrochemical performance of flexible Li-ion batteries should be well maintained in a highly deformed state. In addition, flexible Li-ion batteries are usually thinner than conventional Li-ion batteries with thick stacked structures. Much less electrode material is contained, resulting in lower energy density of flexible Li-ion batteries. Therefore, how to increase the capacity of flexible electrodes to increase the energy density of flexible lithium-ion batteries has become a key challenge in the development of flexible lithium-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/62H01M10/0525
CPCH01M4/523H01M4/628H01M4/625H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 曹元成郭亚晴陈盛锐郭驰梁济元
Owner HUAZHONG UNIV OF SCI & TECH
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