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Multilayer membrane electrode and preparation method and application thereof

A multi-layer film and electrode technology, applied in the direction of electrode manufacturing, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of weakened conductivity of electrode materials, low energy density of batteries, and reduced energy density of batteries

Inactive Publication Date: 2014-12-17
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nano-thin-film electrodes limit the increase of electrode loading, resulting in batteries with lower energy density, which greatly limits the commercial application of thin-film electrode materials.
If the loading capacity is increased by simply increasing the thickness of the film, even if a higher initial capacity can be obtained, the performance of the electrode material will be unstable due to the weakened conductivity of the electrode material and the increased volume change.
Nanoparticles can be prepared into lithium-ion battery electrodes through binders and carbon conductive agents, but the application of conductive agents and binders increases the structural complexity of electrode materials and increases the content of inactive substances in electrodes, thus reducing battery energy density

Method used

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  • Multilayer membrane electrode and preparation method and application thereof
  • Multilayer membrane electrode and preparation method and application thereof
  • Multilayer membrane electrode and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1 Preparation of multilayer film electrode

[0036] The multilayer film electrodes are fabricated in MPECVD at one time. Experiment using CH 4 、SH 4 and H 2 as a gas source. A 25 μm thick copper foil was used as the substrate. First, cut the copper foil into discs with a diameter of 7mm according to the size of the electrode pole pieces, and put them on the sample holder of the reaction furnace cavity. Then pre-evacuate the furnace body to 5×10 -2 torr. The carbon layer in the sample is the plasma decomposition and precipitation of CH 4 and H 2 Made, SiO 2 It is the plasma decomposition and precipitation of SiH 4 and H 2 Produced, oxygen comes from residual oxygen in the gas. There is no additional heating source other than the plasma. Decompose CH in the test 4 and SiH 4The instrument power is 600W. The carbon layer is synthesized at a pressure of 3torr, and the mixed gas contains H 2 and CH 4 The ratio is 2:1. The synthetic gas pressure of t...

Embodiment 2

[0037] Example 2 Structural characterization of the multilayer film electrode obtained in Example 1

[0038] The structure and morphology of the multilayer film electrodes were analyzed by scanning electron microscope (SEM), Raman test, transmission electron microscope (TEM) and selected electron diffraction (SAED). The chemical composition and crystal structure of the material were analyzed by XPS and XRD.

[0039] figure 2 For the SEM and TEM characterization data of the prepared multilayer film electrodes, the structure and microscopic morphology of the electrode materials are shown. figure 2 a is the top view of the upper surface of the multilayer film electrode. It can be seen from the figure that the surface of the membrane is covered by a uniform carbon layer. SiO under the carbon layer can be resolved 2 It is distributed in an island shape, and there are certain gaps between the islands. figure 2 b is the cross-sectional picture of the multilayer film electrode...

Embodiment 3

[0043] Embodiment 3 The electrochemical performance characterization of the multilayer film electrode obtained in embodiment 1

[0044] We tested the electrochemical performance of the multilayer film electrode, which was assembled into a double-electrode button cell with metal lithium sheet as the counter electrode. Cell assembly was performed in a glove box filled with an argon atmosphere. As a comparative experiment, we also assembled pure SiO 2 &Si membrane electrode battery. The electrodes do not use any binder and conductive agent. We first conducted a cyclic voltammetry test on the multilayer film electrode, and the voltage window of the test was between 0-3.0V, such as Image 6 shown. In the first cycle, an obvious reduction peak appeared at the position of 0.6V, which corresponds to the decomposition of the electrolyte and the formation of the SEI film. This peak disappeared in the next cycle, indicating that the electrode material has formed a stable SEI fil...

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Abstract

The invention discloses a multilayer membrane lithium ion battery negative electrode comprising a substrate, a silicon base layer and a carbon layer, the silicon base layer and the carbon layer are laminated alternately, the silicon base layer comprises silicon, silicon dioxide and carbon filled between the silicon and the silicon dioxide. The invention also discloses a preparation method using the microwave plasma enhanced chemical vapor deposition (MPECVD) for preparing the multilayer membrane lithium ion battery negative electrode, the multilayer membrane lithium ion battery negative electrode is controllable in the number of electrode layer and thickness, due to the advantages of the structure, the electrode has good conductivity and mechanical adhesion strength, so that the loading capacity of active substances of the electrode is allowed to be improved by increasing of the number of layer, and the energy density of the electrode is improved. The SiO2&Si / C membrane electrode with a 12-layer sandwich structure can achieve good capacity holding rate, and under the current density of 1 / 8C, the reversible capacity reaches 0.46mAh / cm<2> specific capacity per unit area. The material structure strategy can also be applied to other materials, and excellent performances are also expected to be achieved.

Description

technical field [0001] The invention relates to a negative electrode of a lithium ion battery, and more particularly relates to a multilayer film electrode and a preparation method and application thereof. Background technique [0002] With the continuous development of electronic science and technology, its requirements for lithium-ion batteries are also getting higher and higher. With the rapid development of portable devices and electric vehicles, the research and development of lithium-ion battery electrode materials has slowed down its development to a certain extent. At present, we urgently need to develop new safe, low-cost, environmentally friendly and efficient lithium-ion battery electrode materials and battery systems. For negative electrode materials, carbon graphite materials are increasingly unable to meet the requirements of the development of electronic equipment, and alloy system materials have higher capacity than graphite materials, such as Li–Si (Li 4.4...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/36H01M4/139H01M10/0525
CPCH01M4/0428H01M4/13H01M4/139H01M4/366H01M10/0525Y02E60/10
Inventor 王成新庞春雷李娜崔浩
Owner SUN YAT SEN UNIV
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