A kind of metal sodium secondary battery and its application

A secondary battery, metal sodium technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of poor cycle performance, easy precipitation of sodium deposition, and low Coulomb efficiency of sodium-ion batteries, and achieve high-speed migration and safety. The effect of good sex and good safety

Active Publication Date: 2018-01-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of sodium-ion batteries are poor cycle performance and low Coulombic efficiency.
[0003] In order to overcome the current problems of low potential and easy precipitation of sodium deposition in the negative electrode materials of sodium ion batteries, the present invention provides a class of negative electrode materials with high charge and discharge platform, high charge and discharge capacity, and excellent cycle performance and its application in sodium ion batteries. application on

Method used

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  • A kind of metal sodium secondary battery and its application
  • A kind of metal sodium secondary battery and its application
  • A kind of metal sodium secondary battery and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1, tellurium / CMK-1 / copper telluride composite electrode and its electrochemical performance test in sodium ion battery

[0042] 1-1 Preparation of tellurium / CMK-1 / copper telluride composites

[0043] After ball milling elemental tellurium and mesoporous carbon material CMK-1 for 12h, keep at 600°C for 15h under argon atmosphere, then keep at 400°C for 6h, add copper telluride and mix ball mill for 10h, and keep at 400°C for 6h under argon atmosphere , and then stop heating and cool to room temperature to obtain a tellurium / CMK-1 / copper telluride carrier composite material, wherein the molar ratio is tellurium: CMK-1: copper telluride = 1:1:2, and the pore diameter of CMK-1 is 4nm, The specific surface area reaches 2000m 2 / g, the pore volume is 1.3cm 3 / g.

[0044] 1-2 Preparation of tellurium / CMK-1 / copper telluride composite electrode

[0045] The electrode includes the active material prepared above, a conductive additive and a binder. Wherein, the conduc...

Embodiment 2

[0066] Other conditions are identical with embodiment 1, and difference is only that active material is tellurium / single-layer graphene / copper telluride composite material, replaces CMK-1 with the single-layer graphene of equimolar amount, the specific surface area of ​​single-layer graphene 2200m 2 / g. The prepared electrode was combined with metal sodium to form a sodium-tellurium battery. The discharge capacity of the first cycle was 505mA h / g, and after 40 cycles, the capacity could be maintained at 373mA h / g.

[0067] 2-4a Assembly of Na-ion battery

[0068] The only difference from 1-4a is that the first cycle discharge capacity of the tellurium electrode material obtained in Example 2 is 390mA h / g at 0.1C, 329mA h / g at 0.5C, and the capacity retention rate after 50 cycles Still 310mA h / g.

[0069] 2-4b Assembly of Na-ion battery

[0070] The difference from 1-4b is only that the tellurium electrode material obtained in Example 2 is used, the charge-discharge curve u...

Embodiment 3

[0074] Other conditions are the same as in Example 1, except that the active material is a tellurium / double-walled carbon nanotube / copper telluride composite material, and double-walled carbon nanotubes in equimolar amounts replace CMK-1, double-walled carbon nanotubes The inner diameter is 0.7nm and the outer diameter is 1.1nm. The prepared electrode was combined with metal sodium to form a sodium-tellurium battery. The discharge capacity of the first cycle was 525mA h / g, and after 40 cycles, the capacity could be maintained at 380mA h / g.

[0075] 3-4a Assembly of Na-ion battery

[0076] The only difference from 1-4a is that the tellurium electrode material obtained in Example 3 is used. The measured first-cycle discharge capacity of the battery at 0.1C is 380mA h / g, and the first-cycle discharge capacity at 0.5C is 315mA h / g. After 50 cycles, the capacity can be maintained at 302mA h / g.

[0077] 3-4b Assembly of Na-ion battery

[0078] The only difference from 1-4b is tha...

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Abstract

The invention discloses a novel tellurium-based electrode and an application thereof in a sodium-tellurium battery and a sodium-ion battery. The electrode material is selected from elemental tellurium and a tellurium-bearing composite material; the sodium-ion battery comprises a cathode, an anode and an electrolyte; and an anode active material is selected from a tellurium-based material. The sodium-ion battery disclosed by the invention has the characteristics of good safety, high specific capacity and cycling stability.

Description

technical field [0001] The invention belongs to the fields of preparation of energy materials and electrochemical power sources, and in particular relates to a class of electrode materials for sodium ion batteries. Background technique [0002] Sodium-ion batteries are a new type of battery system that has just started. Because of its wide source of raw materials, low cost, and the ability to use electrolytes with lower decomposition voltages, it is very popular in long-term and large-scale energy storage devices. readers' favor. The main problems of sodium-ion batteries are poor cycle performance and low Coulombic efficiency. Sodium-ion batteries work similarly to lithium-ion batteries. The anode material is one of the key factors restricting its overall performance. When using carbon materials commercialized on lithium-ion batteries as the negative electrode of sodium electrodes, sodium ions cannot intercalate and deintercalate freely like lithium ions, and only NaC can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/054
CPCH01M4/362H01M4/581H01M10/054Y02E60/10
Inventor 郭玉国张娟殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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