Alkali metal ion battery

An alkali metal ion, battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high lithium prices and low global reserves

Inactive Publication Date: 2020-10-30
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium-ion batteries also have their own shortcomings, especially its low global reserves, the global element abundance is only 20ppm and the main mineral deposits are concentrated in South America, which has led to the high price of lithium

Method used

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preparation example Construction

[0036] The carbon-composite iron-phosphorus-selenide compound prepared by the method has high crystallinity, uniform carbon coating on the surface, and good practical prospects. Specifically, the embodiment of the present invention discloses a method for preparing a carbon-composite iron, phosphorus, and selenium compound, including the following steps:

[0037] Ferrocene, phosphorus and selenium are mixed according to the molar ratio of 1:1:3 and then reacted in a vacuum-tight environment to obtain a carbon-composite iron, phosphorus, and selenium compound.

[0038]In the process of preparing the carbon-composite iron phosphorus selenium compound, the technical difficulty of preparation is that it needs to be carried out in a high-pressure, high-temperature and oxygen-free environment to ensure that the carbon-composite iron phosphorus selenium compound can be synthesized in one step and in a short time.

[0039] In the present application, the phosphorus is specifically sele...

Embodiment 1

[0050] Take 0.6mmol (0.112g) ferrocene [Fe(C 5 h 5 ) 2 ], 0.6mmol (0.019g) red phosphorus powder [P] and 1.8mmol (0.142g) selenium elemental powder [Se] are packed in the quartz tube that inner diameter is 8mm, under keeping the vacuum state in the tube, the quartz tube is sealed; The quartz tube is placed obliquely in the muffle furnace to keep the reactants at the bottom of the quartz tube; the temperature in the muffle furnace is raised to 600°C at a rate of 2°C / min and kept at 600°C for more than 30 minutes; after natural cooling , Open the quartz tube to get a black powder sample, wash the product several times with ethanol solution after grinding, and finally centrifuge and dry it in a vacuum oven to get the final product carbon-composite iron phosphorus selenium compound FePSe 3 / C nanomaterials.

[0051] From transmission electron micrographs (TEM) ( figure 1 a) and scanning electron micrograph (SEM) ( figure 1 b) It can be seen that the iron phosphorus selenium c...

Embodiment 2

[0056] Example 2 FePSe 3 Sodium-ion battery performance of / C material

[0057] Utilize the FePSe prepared by embodiment 1 3 / C composites assembled into button half-cells: FePSe in half-cell cathode slurry 3 The ratio of / C material, Ketjen black and PVDF is 8:1:1 or 7:1.5:1.5, the separator is Whatman GF / D glass fiber, and the electrolyte is NaPF dissolved in diglyme 6 (concentration 1.0M), on the blue power test system, the charge and discharge cycle of the battery under constant current and the rate performance test under a series of currents can be completed respectively, and the charge and discharge voltage range is 0.8 ~ 2.2V.

[0058] At a range of current densities, FePSe 3 / C nanomaterials exhibit excellent rate performance, when the current density is 50mA g -1 Time( Image 6 ), after 50 charge-discharge cycles, the discharge specific capacity of the material is still as high as 182.7mAh g -1 , and the Coulombic efficiency can be kept above 99.8%.

[0059] Th...

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Abstract

The present invention provides an alkali metal ion battery, which comprises a positive electrode, a negative electrode and an electrolyte, the material of the positive electrode comprises a carbon-compounded iron-phosphorus-selenium compound, a conductive agent and a binder, the carbon-compounded iron-phosphorus-selenium compound comprises a carbon layer and an iron-phosphorus-selenium compound, and the carbon layer coats the surface of the iron-phosphorus-selenium compound. According to the invention, the carbon-compounded iron-phosphorus-selenium compound FePSe3 / C nanosheet is subjected to an electrochemical test; the sodium storage performance analysis of the carbon-compounded iron-phosphorus-selenium compound FePSe3 / C nanosheet material is completed, so that the carbon-compounded iron-phosphorus-selenium compound FePSe3 / C nanosheet material is an excellent alkali metal ion, especially a sodium ion battery positive electrode material.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to an alkali metal ion battery. Background technique [0002] The development of effective electrochemical energy storage and conversion means is a problem that must be solved in today's environment-friendly society. Since being commercialized, lithium-ion batteries have been used in various fields including mobile electronic devices and power vehicles. However, lithium-ion batteries also have their own shortcomings, especially its low global reserves, the global element abundance is only 20ppm and the main mineral deposits are concentrated in South America, which has led to the high price of lithium. Since the global reserves of sodium are as high as 2.4% and are evenly distributed around the world, it has a cheaper price. At the same time, due to the similar principle, it can often be used as a material for lithium-ion batteries and also for sodium-ion batteries. In o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5805H01M4/581H01M4/625H01M4/628H01M10/0525H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 杨晴邢诗琪
Owner UNIV OF SCI & TECH OF CHINA
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