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Hybrid Li/Na ion battery

A lithium-ion battery and sodium-ion battery technology, applied in the field of lithium-ion batteries and electrochemistry, can solve problems such as limiting the reversible deintercalation process and affecting the electrochemical performance of batteries

Active Publication Date: 2018-07-27
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to Na + The ionic radius ratio of Li + Large, so the reversible deintercalation process of sodium ions in the electrode material is limited, thus affecting the electrochemical performance of the battery

Method used

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Experimental program
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Effect test

Embodiment 1

[0020] Graphite is selected as the negative electrode material, and the positive and negative electrodes with the mass ratio of the positive electrode active material to the negative electrode active material = 2.7:1.0, 1M LiPF 6 EC:DMC:DEC (volume ratio 1:1) electrolyte, glass fiber separator, assembled into a button battery in a glove box, and then carried out a constant current charge and discharge test on a LAND at room temperature. The voltage range is 2.8-4.4V.

Embodiment 2

[0022] Lithium titanate is selected as the negative electrode material, and the positive and negative electrodes with the mass ratio of the active material of the positive electrode sheet to the active material of the negative electrode sheet = 1.3:1.0, and 1M LiPF 6 EC:DMC:DEC (volume ratio 1:1) electrolyte, glass fiber separator, assembled into a button battery in a glove box, and then carried out a constant current charge and discharge test on a LAND at room temperature. The voltage range is 2.8-4.4V.

Embodiment 3

[0024] The negative electrode material is made of silicon material (such as Si / C nanocomposite), and the positive and negative electrodes with the mass ratio of the active material of the positive electrode sheet to the active material of the negative electrode sheet = 6.6:1.0, and 1M LiPF 6 EC:DMC:DEC (volume ratio 1:1) electrolyte, glass fiber separator, assembled into a button battery in a glove box, and then carried out a constant current charge and discharge test on a LAND at room temperature. The voltage range is 2.8-4.4V.

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PUM

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Abstract

The invention discloses a hybrid Li / Na ion battery. A cathode material is a Na-based material and can serve as a cathode material of a Li ion battery, and the molecular formula of the material is Na3(VO)2(PO4)2F; an anode material is a common anode material of the Li ion battery. The mass ratio of active materials of a positive plate to a negative plate in the hybrid Li / Na ion battery is 2.0-3.0;an electrolyte adopts 1M LiPF6 / EC+DMC+DEC (in the volume ratio being 1:1:1), LiPF6 / EC+DMC (in the volume ratio being 1:1) or LiPF6 / EC+DEC (in the volume ratio being 1:1). The hybrid Li / Na ion batteryhas excellent electrochemical performance, has good performance even in a low-temperature environment and is low in cost, and the application range of the battery is broadened.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries and electrochemistry, and in particular relates to a hybrid lithium / sodium ion battery with low price, excellent electrochemical performance and wide application range. Background technique [0002] Due to the advantages of long cycle life, high energy density, safety and stability, and no memory effect, lithium-ion batteries play an important role in energy storage and have a wide range of applications, from portable electronic devices, such as laptops and mobile phones, to growing Electric vehicles, hybrid vehicles and large-scale energy storage. However, due to the low abundance of lithium in the earth's crust, its application is costly and limited. However, sodium and lithium are in the same main group, and their chemical and physical properties are similar, so sodium-ion batteries and lithium-ion batteries have similar working principles and energy storage mechanisms, and sodiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 吴兴隆郭晋芝
Owner NORTHEAST NORMAL UNIVERSITY