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Battery electrode, preparation method of battery electrode and hybrid energy storage device

A technology for battery electrodes and composite carbon, which is applied in battery electrodes, electrode manufacturing, electrode current collector coating, etc. It can solve the problems of large transition metal oxides, decreased battery capacity, poor dispersion, etc., and achieve excellent cycle stability. and rate performance, low capacity decay rate, and simple preparation method.

Active Publication Date: 2019-10-18
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, binders such as polyvinylidene fluoride (PVDF) are often used to bond transition metal oxides and conductive agents together to prepare ultra-thin materials, which are used as electrodes, but the size of transition metal oxides in electrodes is large (larger than 50 nanometers), poor dispersion, easy to agglomerate, and weak binding force with the binder, easy to fall off from the electrode, resulting in a sharp drop in battery capacity

Method used

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  • Battery electrode, preparation method of battery electrode and hybrid energy storage device
  • Battery electrode, preparation method of battery electrode and hybrid energy storage device
  • Battery electrode, preparation method of battery electrode and hybrid energy storage device

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preparation example Construction

[0036] see figure 1 , the embodiment of the present invention also provides the preparation method of the battery electrode, which specifically includes the following steps:

[0037] S1, providing a plurality of carbon nanotubes, the plurality of carbon nanotubes are obtained from a super-aligned carbon nanotube array, and preoxidizing the plurality of carbon nanotubes;

[0038] S2, ultrasonically dispersing the plurality of carbon nanotubes in a solvent to obtain a suspension of carbon nanotubes;

[0039] S3, adding a substance containing a transition metal oxyacid group to the carbon nanotube suspension, and stirring and mixing evenly;

[0040] S4, sucking and drying to obtain a transition metal oxide / carbon nanotube composite electrode.

[0041] Steps S1 to S4 will be described in detail below.

[0042] In step S1, a plurality of carbon nanotubes are provided, and the plurality of carbon nanotubes are obtained from a super-aligned carbon nanotube array, and the plurality...

Embodiment 1

[0079] Preparation of MnO 2 / aCNT electrode: put a super-parallel array of carbon nanotubes in the air and heat at 550 degrees Celsius for 30 minutes to obtain air-CNT; then take 100 mg of air-CNT and disperse them in deionized water to obtain a suspension of carbon nanotubes Cloudy liquid, add 1.0 g of KMnO to the carbon nanotube suspension 4 , stirred magnetically at room temperature for 6 days, and then vacuum filtered to obtain a MnO 2 / aCNT composite film structure, the MnO 2 / aCNT composite film structure including multiple carbon nanotubes and MnO 2 Nanoparticle composition, MnO 2 Nanoparticles are combined with carbon nanotubes through C-O-Mn bonds, and the plurality of carbon nanotubes are intertwined to form a self-supporting film. Since the MnO 2 / aCNT composite film structure has good self-supporting and electrical conductivity, so the MnO 2 The / aCNT composite film structure can be used directly as a battery electrode without the need for current collectors ...

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Abstract

The invention relates to a battery electrode. The battery electrode comprises a plurality of carbon nanotubes and transition metal oxide nanoparticles; and the transition metal oxide nanoparticles andthe plurality of carbon nanotubes are connected through C-O-M chemical bonds in a bonded manner, wherein M represents transition metal. The invention further relates to a preparation method of the battery electrode and a hybrid energy storage device using the battery electrode.

Description

technical field [0001] The invention relates to a battery electrode, a preparation method of the battery electrode and a hybrid energy storage device. Background technique [0002] Commonly used energy storage devices mainly include lithium-ion batteries and supercapacitors. Lithium-ion batteries have the characteristics of high energy density, but their cycle life is short and power density is low. Although supercapacitors have a long cycle life and high power density, their energy density Therefore, there is an urgent need for a hybrid energy storage device with high power density and high energy density. [0003] Supercapacitor battery is a new type of energy storage device with high energy density and high power density. "High-performance energy storage devices with characteristics are of great significance. Transition metal oxides with capacitive lithium storage behavior and high theoretical capacity are usually used as lithium-ion battery electrode materials to incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393H01G11/86H01G11/36H01G11/46
CPCH01M4/133H01M4/131H01M4/1391H01M4/1393H01G11/86H01G11/36H01G11/46H01M4/502H01M4/483H01M4/523H01M4/625Y02E60/10Y02P70/50Y02E60/13H01M4/587H01M4/0404H01M2004/021
Inventor 王大涛孙黎王珂王佳平范守善
Owner TSINGHUA UNIV
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