A kind of silicon-containing porous amorphous alloy lithium-ion battery negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemical power supply, can solve the problems of complex process, difficult to realize industrial production, high cost, etc., achieve the effect of small volume change, prevent concentration polarization, and prevent cracking

Active Publication Date: 2019-12-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the preparation of nanostructured composite materials, preparation methods such as electrochemical deposition and magnetron sputtering are often used, the process is complicated, the cost is high, and it is difficult to achieve large-scale industrial production.

Method used

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  • A kind of silicon-containing porous amorphous alloy lithium-ion battery negative electrode material and preparation method thereof
  • A kind of silicon-containing porous amorphous alloy lithium-ion battery negative electrode material and preparation method thereof
  • A kind of silicon-containing porous amorphous alloy lithium-ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The composite material was obtained by chemical corrosion method, and the electrochemical performance test was carried out as the negative electrode material of lithium ion battery.

[0032] 1. The FeCuNbSiB amorphous powder obtained by high-energy ball milling is corroded by chemical etching, and the specific composition is Fe73.5Cu1Nb3Si13.5B9 (atomic percentage), thereby obtaining silicon-containing porous amorphous alloy-1, wherein the content of Si element is 50.94at% , the B content is 33.96 at%, the Cu content is 3.7 at%, and the Nb content is 11.3 at%.

[0033] 2. Add the selected raw material, FeCuNbSiB amorphous powder obtained by high-energy ball milling, into the dilute hydrochloric acid prepared in the beaker, and stir with a glass rod while adding. In this example, dilute hydrochloric acid is configured with a ratio of 4:1 between deionized water and concentrated hydrochloric acid. The concentration of concentrated hydrochloric acid used is 12mol / L. The am...

Embodiment 2

[0042] The silicon-containing porous amorphous alloy-1 prepared in Example 1 was used as an active material to prepare a battery pole piece, and the battery was assembled with metal lithium as a counter electrode. The battery preparation method and battery assembly conditions are the same as in Example 1, and the test conditions are: charge and discharge voltage range 0.03-1.5V, charge and discharge 20 cycles at a rate of 0.1C. Image 6 In order to prepare the electrode with silicon-containing porous amorphous alloy-1 as the active material, the cycle performance curve and the coulombic efficiency diagram of the battery assembled with lithium metal as the counter electrode. It can be seen that this material has a good capacity retention effect.

Embodiment 3

[0044] The silicon-containing porous amorphous alloy-2 was obtained by chemical corrosion method, and its electrochemical performance was tested as an anode material for lithium-ion batteries. The difference from Example 1 is that in the etching process, the required amount of concentrated hydrochloric acid is calculated and used based on the corrosion of three quarters of the Fe in the FeCuNbSiB amorphous powder. The preparation and testing process are the same as in Example 1.

[0045] In the silicon-containing porous amorphous alloy-2 prepared in this example, the content of Si element is 30.1 at%, the content of B is 20.1 at%, the content of Cu is 2.2 at%, and the content of Nb is 6.7 at%. Its XRD pattern is as Figure 7 As shown, it is a typical amorphous diffuse scattering peak, but a small amount of crystalline phase is formed. The pore size formed by corrosion in this porous material is 200nm, and the particle size is ≦10μm. The electrochemical test results show that...

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Abstract

The invention discloses a silicon-containing porous amorphous alloy negative electrode material for a lithium ion battery and a preparation method thereof, belonging to the field of electrochemical power sources. The negative electrode material mainly comprises 10 to 60 at% of Si, 10 to 35 at% of B and 0 to 55 at% of Fe, with the balance being other elements. The preparation method comprises the following steps: adding Si-containing Fe-based amorphous alloy (an amorphous nanocrystal composite material) into dilute hydrochloric acid for corrosion so as to remove Fe; and then successively carrying out standing, pumping filtration, washing, drying, ultrasonic crushing and sieving so as to obtain the silicon-containing porous amorphous alloy material. The preparation method which prepares the silicon-containing porous amorphous alloy material by using a chemical corrosion method has the advantages of simple preparation process and low cost; and the prepared silicon-containing porous amorphous alloy material has excellent electrochemical properties like high specific capacity and a stable discharge platform when used as the negative electrode material for the lithium ion battery, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of electrochemical power sources, in particular to a silicon-containing composite negative electrode material for lithium-ion batteries, in particular to a silicon-containing porous amorphous alloy lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in aerospace, military, automobile industry, electronic equipment and biomedical fields due to their long service life, high output voltage, low self-discharge and environmental friendliness. However, at present, most commercial lithium-ion batteries use carbon materials as negative electrodes, such as activated carbon and graphite. Due to the low specific capacity of these carbon materials (theoretical value is 372mAh / g), it is difficult to meet the high energy density requirements of large-scale electric energy transmission storage units and electric vehicles and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M10/0525
CPCY02E60/10
Inventor 朱正旺吴金波张海峰付华萌张宏伟王爱民李宏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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