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Semi-solid flow battery with ion-embedded solid negative electrode

An ion intercalation and semi-liquid flow technology, applied in the field of electrochemistry, can solve problems such as unsatisfactory performance, capacity attenuation, and limited system power density, and achieve no risk of fire and explosion, high power energy density, and long service life. Effect

Inactive Publication Date: 2018-08-03
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance of these aqueous systems is not satisfactory: the kinetics of sodium manganese oxide cathode and lithium manganate cathode are limited by the diffusion of sodium ions or lithium ions in the solid electrode, thus limiting the power density of the system
In addition, the protons in the aqueous solution will also intercalate into the sodium manganese oxide positive electrode or lithium manganate positive electrode along with sodium ions or lithium ions, causing capacity fading
More importantly, this causes both the sodium manganese oxide positive electrode and the lithium manganese oxide positive electrode to be very sensitive to the pH value of the electrolyte. Therefore, when the closed-type aqueous battery is overcharged and oxygen is evolved and the proton concentration increases, the protons will react with sodium Sodium and lithium ions in manganese oxide or lithium manganate undergo exchange reactions, resulting in capacity fading

Method used

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Examples

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Effect test

Embodiment 1

[0034] Example 1: A semi-fluid flow battery based on a sodium titanium phosphate negative electrode and an iron-glycine complex, and the positive and negative electrolytes are sodium sulfate.

[0035] In this example, 2 mol / L iron-glycine solution (10 mL) was used for the positive electrode, and 2.0 mol / L Na 2 SO 4 . The diaphragm is Nafion 115 membrane. The negative electrode is carbon-coated sodium titanium phosphate, and the negative electrode film is prepared as follows: According to the mass ratio of active material (sodium titanium phosphate): conductive agent (carbon nanotubes): binder (polytetrafluoroethylene) is 8:1:1 After mixing, it is rolled into a uniform film, and after drying, it is cut into electrodes with a size of 3 cm*3.5 cm, and is evenly pressed with a titanium mesh collector in a sandwich structure, so that the thickness of the final finished electrode is about 0.5 mm, and the active material is charged. Loaded at 400 mg cm -2 about. at 40 mA cm -2 ...

Embodiment 2

[0036] Example 2: A semi-fluid flow battery based on a sodium titanium phosphate negative electrode and an iron-glycine complex, and the positive and negative electrolytes are sodium sulfate.

[0037] In this example, 1 mol / L iron-glycine solution (20 mL) was used for the positive electrode, and 2.0 mol / L Na 2 SO 4 . The diaphragm is Nafion 115 membrane. The negative electrode is carbon-coated sodium titanium phosphate, and the negative electrode film is prepared as follows: According to the mass ratio of active material (sodium titanium phosphate): conductive agent (carbon nanotubes): binder (polytetrafluoroethylene) is 8:1:1 After mixing, it is rolled into a uniform film, and after drying, it is cut into electrodes with a size of 3 cm*3.5 cm, and is evenly pressed with a titanium mesh collector in a sandwich structure, so that the thickness of the final finished electrode is about 0.5 mm, and the active material is charged. Loaded at 400 mg cm -2 about. at 40 mA cm -2 ...

Embodiment 3

[0038] Embodiment 3: A semi-fluid flow battery based on a lithium titanium phosphate negative electrode and an iron-glycine complex, and the positive and negative electrolytes are lithium sulfate.

[0039] In this example, 2 mol / L iron-glycine solution (10 mL) was used for the positive electrode, and 2.0 mol / LLi 2 SO 4 . The diaphragm is Nafion 115 membrane. The negative electrode is carbon-coated lithium titanium phosphate, and the negative electrode film is prepared as follows: according to the mass ratio of active material (lithium titanium phosphate): conductive agent (carbon nanotubes): binder (polytetrafluoroethylene) is 8:1:1 After mixing, it is rolled into a uniform film, and after drying, it is cut into electrodes with a size of 3 cm*3.5 cm, and is evenly pressed with a titanium mesh collector in a sandwich structure, so that the thickness of the final finished electrode is about 0.5 mm, and the active material is charged. Loaded at 400 mg cm -2 about. at 40 mA c...

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Abstract

The invention belongs to the technical field of electrochemistry, and concretely relates to a semi-solid flow battery with an ion-embedded solid negative electrode. The system of the battery comprisesa sodium titanium phosphate or lithium titanium phosphate negative electrode, a negative electrode liquid composed of an aqueous solution containing one or two of a sodium ion and a lithium ion, an ion exchange membrane, and a positive electrode liquid formed by an aqueous solution containing an iron ion complex and one or two of the sodium ion and the lithium ion. The high-energy density solid-state water-based negative electrode material sodium titanium phosphate or lithium titanium phosphate is adopted to replace a liquid negative electrode in a traditional liquid flow battery, so the advantages of separate energy and power design, high safety and long cycle life of the liquid flow battery are kept; and the semi-solid flow battery is not limited by the concentration of a solute, so theenergy density of the negative side is greatly improved, and the impedance of the battery is greatly reduced, thereby the volumetric energy density, the mass energy density and the working efficiencyof a whole battery module are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a semi-liquid flow battery with an ion-embedded solid negative electrode. Background technique [0002] Energy is a major strategic resource related to the national economy and people's livelihood. Vigorously promoting the adjustment of energy structure, reducing the use of fossil energy, improving the efficiency of fossil energy utilization, and popularizing the application of renewable energy are the inevitable choices to solve my country's energy problems and achieve social progress and sustainable development. The peak and valley fluctuations in power consumption in the traditional power grid cause a huge waste of power resources, while the discontinuous and unstable power generation of wind energy, solar energy and other renewable energy sources limits the feasibility of their large-scale integration into the power grid. A lot of waste. Large-scale ene...

Claims

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Application Information

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IPC IPC(8): H01M8/18H01M8/04276H01M8/04186H01M8/04082
CPCH01M8/04186H01M8/04201H01M8/04276H01M8/188Y02E60/50
Inventor 王永刚夏永姚王仁和
Owner FUDAN UNIV
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