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Metal-graphite medium-temperature energy storage battery and preparation method thereof

A technology of energy storage batteries and metal graphite, which is applied in the direction of secondary batteries, circuits, electrical components, etc., and can solve problems such as safety accidents, high energy storage costs, and high prices of ion exchange membrane energy storage

Active Publication Date: 2019-06-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, lead-acid batteries have low energy density, slow charge and discharge speed, short cycle life, and great environmental pollution; sodium-sulfur batteries use β-alumina solid electrolytes, which have high manufacturing costs and poor thermal stability, and are prone to rupture. And lead to serious safety accidents; liquid flow batteries are also facing technical problems with key materials such as electrolytes, electrode plates, especially ion-exchange membranes, and high energy storage prices; the main restrictions on the application of lithium-ion batteries in the energy storage market The factor is that the cost of a single energy storage in the whole life cycle is too high (about 0.12$·kWh-1), which is difficult to be accepted by the commercial energy storage market
These all limit the application of the above-mentioned battery technology in grid energy storage to a certain extent.

Method used

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  • Metal-graphite medium-temperature energy storage battery and preparation method thereof
  • Metal-graphite medium-temperature energy storage battery and preparation method thereof
  • Metal-graphite medium-temperature energy storage battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0063] The negative electrode metal is Fe, and the electrolyte is NaAlCl saturated with NaCl 4 Molten salt electrolyte, the positive electrode is carbon cloth or carbon felt, namely Fe|FeCl 2 |NaAlCl 4 (Saturated NaCl)|Graphite battery as an example. After testing, the battery has a coulombic efficiency of 99.4% for more than 11,000 cycles, and the capacity after the final cycle is only attenuated by 3% compared with the initial capacity. The current density and specific capacity in the figure All calculated relative to the positive electrode graphite material, they are 104mAh / g and 10000mA / g respectively. Metal iron is used as the negative electrode, the cost is low, and the working voltage of the obtained battery is high. Wherein the negative electrode material is prepared by the above-mentioned method one.

Embodiment 2

[0065] The negative electrode metal is Ni foam, and the electrolyte is NaAlCl saturated with NaCl 4 Molten salt electrolyte, positive carbon cloth, assembled into foam Ni|NiCl 2 |NaAlCl 4 (saturated NaCl) | Graphite battery.

[0066] Among them, the negative electrode material is prepared by the above-mentioned method two, and a layer of NiCl is evenly attached to the surface of the foamed Ni. 2 .The assembled battery was tested and found that the battery can work continuously and stably.

Embodiment 3

[0068] The negative electrode metal is Zn, and the electrolyte is NaAlCl saturated with NaCl 4 Molten salt electrolyte, the positive electrode is three-dimensional graphene, that is, Zn|ZnCl 2 |NaAlCl 4 (saturated NaCl) | graphene battery.

[0069] Among them, the negative electrode material is prepared by the above method three, using X powder and XCl with a molar ratio of 2.6:1 2 The powder and additives are uniformly mixed with Al powder and sintered into flakes. The assembled battery was tested and found that the battery can also work continuously and stably.

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Abstract

The invention discloses a metal-graphite medium-temperature energy storage battery and a preparation method thereof, and the metal-graphite medium-temperature energy storage battery is characterized in that the metal-graphite medium-temperature energy storage battery comprises a positive electrode, a negative electrode and an electrolyte; a gasket is arranged between the positive electrode and thenegative electrode; the electrolyte is arranged in the gasket, and the positive electrode is a graphite material; the electrolyte is YAlCl4 of saturated YCl, wherein Y is Li, Na or K; the negative electrode is an X|XCl2 solid-phase composite electrode, wherein X is a metal with the electronegativity being higher than the electronegativity of Al. The operation temperature of the battery is 100-200DEG C, the cycle life exceeds 10000 times, and the balance voltage is about 1-1.7 V.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage batteries, and in particular relates to metal graphite medium-temperature energy storage batteries and a preparation method thereof. Background technique [0002] After my country's economy experienced a period of extensive and rapid growth with large-scale resource input, overcapacity reduction and structural adjustment have become the key content of my country's economic transformation into an intensive development model at this stage. Among them, the energy issue is the most critical issue in many fields of economic development. Its main content is to eliminate backward and inefficient energy output, improve the utilization efficiency of existing energy output, vigorously develop renewable energy such as wind energy and solar energy, and build a smart grid to Solving the distribution regulation and efficient utilization of electric energy, etc., all of these put forward h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/39H01M10/38
CPCY02E60/10Y02P70/50
Inventor 宁晓辉代涛廖陈正单智伟
Owner XI AN JIAOTONG UNIV
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