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High-voltage positive electrode material of liquid or semi-liquid metal battery and application thereof

A positive electrode material and metal battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low energy density, low working voltage, etc., and achieve the goal of increasing specific capacity and energy density, increasing discharge voltage, and improving Coulombic efficiency Effect

Pending Publication Date: 2022-02-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects and deficiencies of the prior art, the present invention provides a high-voltage positive electrode material applied to liquid or semi-liquid metal batteries, which can effectively solve the problem of existing liquid or semi-liquid metal batteries after being applied to energy storage batteries. The problem of low voltage and low energy density

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  • High-voltage positive electrode material of liquid or semi-liquid metal battery and application thereof
  • High-voltage positive electrode material of liquid or semi-liquid metal battery and application thereof
  • High-voltage positive electrode material of liquid or semi-liquid metal battery and application thereof

Examples

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Embodiment 1

[0043] In this embodiment, a selenium-bismuth alloy is used as the positive electrode material, and the mole percentage of selenium and bismuth is 20:80 mol%. Lithium metal is the negative electrode material. The electrolyte is a binary molten salt composed of LiCl and KCl, wherein the molar percentage of LiCl and KCl is 59:41 mol%.

[0044] The preparation process of the selenium-bismuth alloy used in this example is as follows: Weigh 0.81 g of selenium and 8.57 g of bismuth with an electronic balance, mix them mechanically and put them into a graphite crucible, heat the crucible to 550°C under the protection of an inert atmosphere and keep it warm for 10 hours to make the raw materials Fully alloyed, the positive electrode material Se can be obtained after cooling down 20 Bi 80 .

[0045] In this embodiment, a porous foam nickel-iron alloy is selected as the negative electrode current collector, which is immersed in molten metal lithium to absorb 0.14 g of liquid metal li...

Embodiment 2

[0049] In this embodiment, a selenium-bismuth alloy is used as the positive electrode material, and the mole percentage of selenium and bismuth is 30:70 mol%. Lithium metal is the negative electrode material. The electrolyte is a binary molten salt composed of LiCl and KCl, wherein the molar percentage of LiCl and KCl is 59:41 mol%.

[0050] The preparation process of the selenium-bismuth alloy used in this example is as follows: Weigh 0.81 g of selenium and 5.00 g of bismuth with an electronic balance, mix them mechanically and put them into a graphite crucible, heat the crucible to 550° C. under the protection of an inert atmosphere and keep it warm for 10 hours to make the raw materials Fully alloyed, the positive electrode material Se can be obtained after cooling down 30 Bi 70 .

[0051] In this embodiment, a porous foam nickel-iron alloy is selected as the negative electrode current collector, which is immersed in molten metal lithium to absorb 0.14 g of liquid metal ...

Embodiment 3

[0055] In this embodiment, a selenium-bismuth alloy is used as the positive electrode material, and the mole percentage of selenium and bismuth is 40:60 mol%. Lithium metal is the negative electrode material. The electrolyte is a ternary molten salt composed of LiF, LiCl and LiBr, wherein the molar percentage of LiF, LiCl and LiBr is 22:31:47 mol%.

[0056]The preparation process of the selenium-bismuth alloy used in this example is as follows: weigh 0.81 g of selenium and 3.22 g of bismuth with an electronic balance, put them into a graphite crucible after mechanical mixing, heat the crucible to 550 ° C under the protection of an inert atmosphere and keep it warm for 10 hours to make the raw materials Fully alloyed, the positive electrode material Se can be obtained after cooling down 40 Bi 60 .

[0057] In this embodiment, a porous foam nickel-iron alloy is selected as the negative electrode current collector, which is immersed in molten metal lithium to absorb 0.14 g of ...

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Abstract

The invention discloses a high-voltage positive electrode material of a liquid or semi-liquid metal battery, and belongs to the field of electrode materials of energy storage batteries. The positive electrode material is elementary Se or Se alloy formed by Se and one or more of metal Bi, Sn, Pb, Sb, Cu and Zn. The elementary Se has relatively high electronegativity (2.4) and relatively high theoretical potential, and the elementary Se and common negative electrode materials such as metal Li, Na, Mg and Ca are assembled into a liquid or semi-liquid metal battery, so that the working voltage of the battery can be greatly improved, and the energy density of the battery is improved. One or more of metal Bi, Sn, Pb, Sb, Cu and Zn are alloyed with Se, so that the electronic conductivity of the positive electrode material can be effectively improved, the utilization rate of Se is improved, and the discharge capacity and energy density of the material are further improved; and the electrode reaction kinetics can be accelerated, the battery charge-discharge polarization is reduced, and the energy efficiency is improved. The liquid or semi-liquid metal battery using the positive electrode material has higher working voltage, energy density and efficiency.

Description

technical field [0001] The invention belongs to the field of electrode materials for energy storage batteries, and in particular relates to a high-voltage positive electrode material for liquid or semi-liquid metal batteries, which can be used to solve the problems of low working voltage, low energy density and low energy efficiency of liquid or semi-liquid metal batteries. Background technique [0002] As today's global environmental problems become increasingly prominent, the development and utilization of renewable energy has attracted much attention. As representatives of green energy, wind energy and solar photovoltaic power generation have attracted increasing attention. However, because wind energy and solar energy are greatly affected by environmental factors such as light and climate, and have random and intermittent characteristics, direct access to the power grid will have an impact on the power grid. , seriously affecting the security and stability of the power g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38
CPCH01M4/36H01M4/38H01M4/382H01M4/381Y02E60/10
Inventor 赵海雷李泽浩谢宏亮褚鹏冯江源刘易朋
Owner UNIV OF SCI & TECH BEIJING