Zn-Ge-Cu-Si-P high-entropy alloy material used as negative electrode of lithium ion battery and preparation method for Zn-Ge-Cu-Si-P high-entropy alloy material

A zn-ge-cu-si-p, lithium-ion battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., to achieve the effects of reducing material costs, improving electrochemical performance, and relieving stress and strain

Active Publication Date: 2021-12-28
HAINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of Zn-Ge-P ternary alloy materials also has a large room for improvement.

Method used

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  • Zn-Ge-Cu-Si-P high-entropy alloy material used as negative electrode of lithium ion battery and preparation method for Zn-Ge-Cu-Si-P high-entropy alloy material
  • Zn-Ge-Cu-Si-P high-entropy alloy material used as negative electrode of lithium ion battery and preparation method for Zn-Ge-Cu-Si-P high-entropy alloy material
  • Zn-Ge-Cu-Si-P high-entropy alloy material used as negative electrode of lithium ion battery and preparation method for Zn-Ge-Cu-Si-P high-entropy alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present inventors synthesized multiple alloy negative electrode material and a carbon composite material mainly by high energy ball milling, preparation method includes the following steps to Zn :( 0.5 GE 0.5 Cu 0.5 Si 0.5 P 2 For example)

[0044] ① the zinc, germanium powder (Macklin, 99.999%), copper powder (Macklin, 99.9%), molar ratio of silica fume (Aladdin, 99.9%) and red phosphorus (Macklin, AR98.5%) according to a specific (1: 1: 1: 1: 4) were weighed and proportion, into a stainless steel ball mill jar, the ball material than stainless steel beads and the powder material is 20: 1, into a stainless steel jar filled with an inert atmosphere (Ar gas protection) glove box (anhydrous oxygen-free, the oxygen content of water <1ppm), in the glove box of stainless steel jar tightly encapsulated (for locking and sealing with a locking device).

[0045] ② stainless steel jar remove the glove box, mounted on a ball mill for tightening and fixing, provided rotation speed ...

Embodiment 2

[0048] Preparation Example 1 with reference to embodiments, adjustment zinc, germanium powder, copper powder, silicon powder, and red phosphorus molar ratio, were prepared Zn 0.8 GE 0.8 Cu 0.2 Si 0.2 P 2 , Zn 0.7 GE 0.7 Cu 0.3 Si 0.3 P 2 , Zn 0.6 GE 0.6 Cu 0.4 Si 0.4 P 2 , Zn 0.4 GE 0.4 Cu 0.6 Si 0.6 P 2 , Zn 0.3 GE 0.3 Cu 0.7 Si 0.7 P 2 , Zn 0.2 GE 0.2 Cu 0.8 Si 0.8 P 2 High-entropy alloys.

[0049]

[0050]

[0051] The material obtained above embodiment detects the following results:

[0052] (1) X- ray diffraction pattern of Zn-Ge-Cu-Si-P alloy material high entropy synthetic

[0053] like figure 1 Shown, it can be seen from the diffraction pattern, synthesized the alloys with high entropy ZnGeP 2 Consistent with the diffraction peaks, diffraction peaks of the components of a simple substance element have disappeared, indicating that the material has been completely reacted, with high yield and purity. With the reduction and Zn, Ge content, since Si is smaller than the ato...

Embodiment 3

[0063] On the basis of the embodiment 1, the adjustment step ②, ③ the step of milling time, specifically:

[0064] ② stainless steel jar remove the glove box, mounted on a ball mill for tightening and fixing, provided rotation speed of 400 rpm ball mill, ball mill a single time of 1 hour, 30 minute intervals, 13 times the number of repetitions, i.e. a total of 19.5 hours milling time, can be obtained formed by high entropy Zn Zn, Ge, Cu, Si, P element 0.5 Ge 0.5 Cu 0.5 Si 0.5 P 2 Compound.

[0065] The high entropy step ② ③ obtained Zn 0.5 Ge 0.5 Cu 0.5 Si 0.5 P 2 A compound with a carbon material (SuperP) in accordance with a predetermined mass ratio: for (63) were weighed, added to a stainless steel ball mill jar, the ball material than stainless steel beads and the powder material is 20: 1, is provided a ball mill speed of 400 rpm, a single milling time of 1 hour, 30 minute intervals, 11 times the number of repetitions, i.e. a total of 16.5 hours milling time, Zn can be obtaine...

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Abstract

The invention provides a Zn-Ge-Cu-Si-P high-entropy alloy material used as a negative electrode of a lithium ion battery and a preparation method for the Zn-Ge-Cu-Si-P high-entropy alloy material. The preparation method comprises the steps that zinc powder, germanium powder, copper powder, silicon powder and red phosphorus are weighed according to a target proportion with a molar ratio of the zinc powder to the germanium powder to the copper powder to the silicon powder to the red phosphorus being x: x: (1-x): (1-x): 2, and a high-entropy ZnxGexCu (1-x)Si (1-x)P2 compound formed by Zn, Ge, Cu, Si and P elements is obtained after ball milling, wherein x is larger than 0 and smaller than 1; and the high-entropy ZnxGexCu (1-x)Si (1-x)P2 compound is mixed with a carbon material, and ball milling is conducted to obtain a ZnxGexCu (1-x) Si (1-x) P2 / C composite. The material has the advantages of large specific discharge capacity, high initial coulombic efficiency, good reversibility, excellent electrochemical performance, low cost and the like.

Description

Technical field [0001] The present invention relates to a lithium ion battery, and more particularly relates to a Zn-Ge-Cu-Si-P alloy material and high-entropy method for preparing a negative electrode for lithium-ion batteries. Background technique [0002] A lithium ion battery for its environmentally friendly, energy conversion rate, fast charge and discharge, etc. stand out in conventional chemical power, is considered to be the preferred source of electric vehicles. However, limited by the low discharge capacity (372mAh / g) of the conventional graphite negative electrode, a current lithium-ion battery in energy density, power density is still far compared with the internal combustion engine, can not meet the demand for electric cars mileage. As the core of one of the components, anode material is to improve the energy density of the lithium-ion battery and battery key factor in determining the merits of the performance, therefore, the development of high-capacity, high-perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/06C22C1/05C22C1/10B22F9/04H01M4/38H01M4/42H01M10/0525
CPCC22C30/02C22C30/06C22C1/05B22F9/04H01M4/42H01M4/38H01M10/0525B22F2009/043H01M2004/027Y02E60/10
Inventor 韦雅庆姚润哲李会巧陈永
Owner HAINAN UNIVERSITY
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