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Anode material of lithium-ion battery

A sodium ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low sodium intercalation capacity and poor cycle performance, and achieve high reversible capacity, good cycle performance, and good intercalation and desorption The effect of sodium capacity

Inactive Publication Date: 2012-07-04
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

[0004] Taking sodium intercalation negative electrode materials as an example, the materials reported so far are mainly hard carbon materials. For example, Dahn, a Canadian researcher, prepared hard carbon materials by pyrolysis of glucose. The reversible sodium intercalation capacity of the material reached 300 mAh / g, but Part of the capacity comes from the sodium analysis reaction below 0V, and the cycle performance is not good ( Journal of the Electrochemical Society 2000, 147 , 1271); Japanese researcher Komaba reported a hard carbon material with an initial reversible capacity of 240 mAh / g, after 100 cycles, the capacity remained above 200 mAh / g ( Advanced Functional Materials 2011, 21 , 3859)
However, the sodium intercalation capacity of these materials is still low. In order to meet the development needs of high specific energy sodium ion batteries, it is necessary to develop a new generation of anode materials for sodium ion batteries.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] The preparation of embodiment 1.Sn / acetylene black and electrochemical sodium storage performance

[0024] The commercialized Sn powder and acetylene black were mixed evenly according to the weight ratio of 70:30, and placed in a ball mill jar for ball milling for 8 hours to obtain the Sn / acetylene black composite material. With this material as the active material, the metal sodium sheet is the counter electrode, 1mol L -1 NaPF 6 (EC-DEC=1:1) Assembled the battery with the electrolyte to test its electrochemical performance, figure 1 is the first-cycle galvanostatic charge-discharge curve of the Sn / acetylene black composite, such as figure 1 shown at 100 mA g -1 Under the current density, the reversible capacity of the material is 329mAh g -1 , after 20 cycles, the capacity reached 221mAh g -1 (Such as figure 2 ).

[0025]

Embodiment 2

[0026] Embodiment 2. Preparation and electrochemical sodium storage performance of SbFe / acetylene black

[0027] The commercial Sb powder, Fe powder and acetylene black were mixed evenly according to the weight ratio of 70:5:25, and placed in a ball mill jar for ball milling for 8 hours to obtain the SbFe / acetylene black composite material. With this material as the active material, the metal sodium sheet is the counter electrode, 1mol L -1 NaPF 6 (EC-DEC=1:1) Assembled the battery with the electrolyte to test its electrochemical performance, image 3 The first-cycle galvanostatic charge-discharge curves for the SbFe / acetylene black composite, as image 3 shown at 100 mA g -1 Under the current density, the reversible capacity of the material is 350mAh g -1 , after 90 cycles, the capacity reached 410mAh g -1 (Such as Figure 4 ).

[0028]

Embodiment 3

[0029] Embodiment 3. Preparation and sodium storage performance of SnSb / polypyrrole

[0030] Weigh Sn powder and Sb powder according to the mass ratio of 1:1 and mix them evenly, heat them at 500°C for 2 hours in a high-purity argon atmosphere to form a SnSb alloy, then weigh the SnSb alloy and polypyrrole according to the mass ratio of 7:3, and planetary ball mill for 60 minutes Get the required materials. A battery was assembled according to the method in Example 1 for electrochemical testing. at 100mAg -1 Current density, charging and discharging in the range of 0-2.0V, the measured reversible capacity in the first week is 450mAhg -1 , 82% of the initial capacity was still maintained after 20 weeks of circulation.

[0031]

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Abstract

The invention discloses an anode material of a lithium-ion battery. The anode material can form alloy with sodium (Na). The anode material consists of metal M which can form the alloy with Na ions and an inert medium A, wherein the metal M which can form the alloy with the Na ions is one or more of stannum (Sn), antimony (Sb) and plumbum (Pb); and the inert medium A is one or more of a carbon material, a conducting polymer, copper (Cu), iron (Fe), aluminum (Al), titanium (Ti), silicon carbide (SiC), titanium carbide (TiC), wolfram carbide (WC), titanium nitride (TiN) and titanium boride (TiB). In the material, the metal M and the Na can be alloyed or de-alloyed through electrochemical reaction, and energy conversion is performed; and the inert medium A is mainly used for scattering, stabilizing and electrically conducting the material. The anode material of the lithium-ion battery is high in specific capacity, low in cost and environment-friendly.

Description

[0001] technical field [0002] The invention relates to a negative electrode material for a sodium ion battery, which belongs to the field of secondary batteries and also belongs to the technical field of energy materials. Background technique [0003] In recent years, the application research of large-capacity lithium-ion batteries has been increasing day by day, and it is regarded as the main choice for large-scale energy storage batteries such as electric vehicles and energy storage power stations in the future. However, the limited lithium resource reserves and high material cost have brought huge obstacles to its widespread application. The development of an advanced battery system with abundant resources and low cost is an inevitable way out for large-scale power storage applications in the future. Sodium element is in the same main group as lithium, with similar chemical properties and relatively close electrode potentials, and sodium is abundant in resources, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/134H01M10/054
CPCY02E60/122Y02E60/10
Inventor 曹余良杨汉西艾新平钱江锋肖利芬吴琳
Owner WUHAN UNIV
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