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High-entropy alloy for negative electrode of lithium ion battery, negative electrode material of battery and preparation method of negative electrode material of battery

A lithium-ion battery, high-entropy alloy technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of rapid charge-discharge rate performance degradation in battery cycle life, hinder the development and industrialization of alloy-type negative electrode materials, and active materials. Crystal structure collapse and other problems, to achieve the effect of easy large-scale promotion and preparation, easy large-scale preparation, promotion and use, and improved cycle life

Active Publication Date: 2022-01-21
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, although the above-mentioned alloy-type anode materials have high lithium storage activity and large discharge capacity, they will suffer from huge stress strain and volume expansion during the charge and discharge process, and the volume expansion coefficient is as high as 400%, which makes the active material suffer severe The crystal structure collapses, the particle morphology breaks, and the electrode pulverizes and falls off, which eventually leads to a rapid decline in the cycle life of the battery and the rate performance of rapid charge and discharge.
In addition, due to the continuous destruction and regrowth of the solid electrolyte (SEI) film on the surface of electrode materials and side reactions at the surface and interface of active particles, a large amount of irreversible Li is consumed. + , so that the first coulombic efficiency ICE (charge capacity / discharge capacity) of the alloy-type single-substance anode material is extremely low 90%)
Therefore, the poor cycle stability and low initial Coulombic efficiency of alloy-type anode materials greatly hinder the further development and industrialization of alloy-type anode materials. Common challenges faced by the industry

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  • High-entropy alloy for negative electrode of lithium ion battery, negative electrode material of battery and preparation method of negative electrode material of battery
  • High-entropy alloy for negative electrode of lithium ion battery, negative electrode material of battery and preparation method of negative electrode material of battery
  • High-entropy alloy for negative electrode of lithium ion battery, negative electrode material of battery and preparation method of negative electrode material of battery

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Embodiment 1

[0038] This embodiment provides a high-entropy alloy for the negative electrode of a lithium-ion battery, which includes the following components: Ge, Sn, Sb, Si, Cu, Fe, P, and its molar ratio is 0.2:0.1:0.05:0.05: 0.05:0.05:1.

[0039] The preparation method of the high-entropy alloy for lithium-ion battery negative pole comprises the following steps:

[0040] S1, the above-mentioned powdered Ge (Aladdin, 99.999%), Sn (Aladdin, 99.99%), Sb (Aladdin, 99.99%), Si (Aladdin, 99.99%), Cu (Aladdin, 99.99%), Fe (Aladdin , 99.999%), P (Aladdin, 99.9%) were weighed according to the quality of 0.615g, 0.503g, 0.258g, 0.059g, 0.135g, 0.118g, 1.313g respectively, and added to the stainless steel ball mill jar containing stainless steel beads , wherein the ball-to-material ratio is 20:1; the stainless steel jar is put into an argon-protected glove box, and the stainless steel jar is sealed and tightly sealed in the glove box to obtain the mixture;

[0041] S2. Take out the stainless st...

Embodiment 2

[0053] This embodiment provides a lithium-ion battery negative electrode material, including the high-entropy alloy Ge used for the lithium-ion battery negative electrode of Example 1 0.2 sn 0.1 Sb 0.05 Si 0.05 Cu 0.05 Fe 0.05 P and carbon material; wherein the quality of carbon material is 0.857g, wherein carbon material is conductive carbon black C 45 .

[0054] The preparation method of the negative electrode material of the lithium ion battery comprises the following steps:

[0055] Will Ge 0.2 sn 0.1 Sb 0.05 Si 0.05 Cu 0.05 Fe 0.05 P and carbon materials are added to a stainless steel ball mill tank containing stainless steel beads and powder materials with a ball-to-material ratio of 20:1. The ball milling speed is 400rpm. The mixture is ball milled 10 times. The interval time between is 15min, can obtain lithium-ion battery high entropy alloy / carbon composite anode material Ge 0.2 sn 0.1 Sb 0.05 Si 0.05 Cu 0.05 Fe 0.05 P / C.

[0056] Battery assembly: ...

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Abstract

The invention discloses a high-entropy alloy for a negative electrode of a lithium ion battery. The high-entropy alloy comprises the following components: Ge, Sn, Sb, Si, Cu, Fe and P. The invention further discloses a preparation method of the high-entropy alloy for the negative electrode of the lithium ion battery. The invention also discloses a negative electrode material of the lithium ion battery and a preparation method thereof. The high-entropy alloy has the advantages of large specific capacity, high reversibility, good rate capability, excellent cycle performance and the like.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-entropy alloy used for a negative electrode of a lithium-ion battery, a battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries stand out from the existing chemical power sources for their environmental friendliness, high energy conversion rate, and fast charging and discharging, and are considered to be the preferred power source for electric vehicles. However, limited by the low discharge capacity (372mAh / g) of traditional graphite anodes, current lithium-ion power batteries are still far behind internal combustion engines in terms of energy density and power density, and cannot meet the needs of electric vehicle cruising range. As one of the core components, the negative electrode material is the key factor to improve the energy density of lithium-ion batteries and determine the performance ...

Claims

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Application Information

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IPC IPC(8): C22C30/04C22C30/02C22C1/04B22F9/04B22F3/02B22F3/10H01M4/58H01M10/0525
CPCC22C30/04C22C30/02C22C1/04B22F9/04B22F3/02B22F3/1007H01M4/5805H01M10/0525H01M2004/027B22F2009/043Y02E60/10
Inventor 韦雅庆姚润哲李德陈永
Owner HAINAN UNIVERSITY
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