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Flow battery system

A flow battery and current collector technology, applied in the field of electrochemical energy storage, can solve the problems of low energy density, high consumption of active materials, offsetting advantages of flow battery design, etc., and achieve the effect of high energy density

Inactive Publication Date: 2016-03-30
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of low-energy-density active materials (40Wh / L) in aqueous-phase flow batteries and the need to consume a large amount of mechanical energy for pumping in low-concentration active materials stored in external storage, the design advantages of flow batteries have also been limited. These deficiencies are offset by

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0107] The flow battery system includes several reaction units, storage units, delivery pipelines and power pumps.

[0108] The reaction unit includes a positive electrode collector, a negative electrode collector, and a diaphragm arranged between the positive electrode collector and the negative electrode collector. Both the positive electrode current collector and the negative electrode current collector use graphite foil with a thickness of 0.1 mm, wherein a porous layer is formed on the surface of the negative electrode current collector. Specifically, the preparation process of the porous layer is as follows: activated carbon powder (coconut shell firing, specific surface area is 1500m 2 g -1 ), conductive carbon black, and PVDF in a ratio of 90:5:5 were mixed evenly, NMP was added to dissolve it, and evenly coated on the negative electrode current collector graphite foil to form a porous layer, the thickness of the porous layer was 0.1mm. The diaphragm is Celgard 2500,...

Embodiment approach 2

[0112] In Embodiment 2, the negative electrode current collector is tinned with copper foil, and the rest of the battery configuration is the same as Embodiment 1.

Embodiment approach 3

[0114] LiCoO 2 It is the positive electrode active material, and the carbon-based additive in the positive electrode electrolyte is Ketjen Black (KB), wherein the volume ratio of the positive electrode active material and the carbon-based additive to the positive electrode electrolyte is 26% and 0.8%, respectively.

[0115] The rest of the battery configuration is the same as that of Embodiment 1.

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Abstract

The invention discloses a flow battery system, which comprises a plurality of reaction units, a storage unit, conveying pipelines and power pumps. The storage unit is in connection with the reaction units through the conveying pipelines. According to the invention, the battery charge-discharge units (reaction units) and the energy storage unit are arranged separately, so that the power and capacity of a battery can be independent, the battery power depends on the number of the reaction units connected in parallel or in series in a battery stack, and the battery capacity depends on the content of electrode active materials in an electrolyte solution. The flow battery system provided by the invention has high energy density, long cycle life and high safety performance, and has the advantages of simple making process, low cost and easy integration systematization, thus having very considerable application prospects in electric automobiles, large energy storage equipment like wind energy, solar energy device and power grid peak regulation devices.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a liquid flow battery system. Background technique [0002] The widespread use of new energy by human beings has led to the rapid expansion of the secondary battery market. In the current new energy system, the requirements for secondary batteries are ubiquitous. Whether it is electric vehicles, wind energy, solar grid connection or grid peak regulation, there is an urgent need for a cheap, reliable, safe and long-life secondary battery. How to design a battery with high energy storage, low cost, and high safety to ensure the sustainable development of renewable energy has become one of the important research topics in the battery field. [0003] As the prototype of most current batteries, the utilization efficiency of battery active materials for the voltaic battery is very low. Even the lithium-ion secondary battery with the highest energy density curr...

Claims

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Application Information

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IPC IPC(8): H01M8/04H01M8/02
CPCY02E60/50
Inventor 陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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