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A kind of negative electrode active material of lithium ion battery, its preparation method and lithium ion battery

A negative electrode active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as poor cycle performance, low first Coulombic efficiency, hindering practical applications, etc., and achieve high capacity, charging and discharging The effect of small voltage platform difference and high Coulombic efficiency

Active Publication Date: 2022-02-15
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the unique lithium storage mechanism (alloying mechanism) of these materials, the electrode materials will undergo a series of irreversible structural changes (such as expansion, cracking, pulverization, and shedding) during the process of lithium intercalation and deintercalation, resulting in the first Low coulombic efficiency (ICE) and poor cyclability, which seriously hinder the practical application in full cells

Method used

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  • A kind of negative electrode active material of lithium ion battery, its preparation method and lithium ion battery
  • A kind of negative electrode active material of lithium ion battery, its preparation method and lithium ion battery
  • A kind of negative electrode active material of lithium ion battery, its preparation method and lithium ion battery

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preparation example Construction

[0040] The present invention provides a method for preparing a lithium-ion battery negative electrode active material described in any one of the above technical solutions, comprising:

[0041] It is obtained by mixing aluminum powder, germanium powder and phosphorus powder according to the stoichiometric ratio of the chemical formula, and ball milling under the condition of inert gas.

[0042] In the present invention, the aluminum powder, germanium powder and phosphor powder are firstly mixed according to the metering ratio of the chemical formula, and the mixing ratio is the metering ratio of the above chemical formula. The sources of the above-mentioned aluminum powder, germanium powder and phosphor powder are not limited, and can be purchased commercially.

[0043] Then fill the inert gas as a protective gas to isolate the air to prevent the material from reacting with oxygen or other substances in the air during the ball milling process. Then set the ball milling paramet...

Embodiment 1

[0059] Ball milling AlGeP: Feed Al powder, Ge powder, P powder according to the stoichiometric ratio = 1:1:1, that is, take 0.6204g of Al powder, 1.6673g of Ge powder, and 0.7123g of P powder, 3g in total. Then the raw materials are put into the ball mill jar, then 25 stainless steel balls (ball-to-material ratio=20:1) are put into the ball mill jar, and then argon gas is filled in the glove box (because Al is easily oxidized, the amount of Al weighed in the glove box ), after filling, seal well, every ball milling 1h intermittent 25min, rotating speed is 1200r, total ball milling time 8h, one-way rotation, XRD measured after ball milling, XRD see figure 1 . (The broad peak between 10°-25° is the peak of polyimide tape)

Embodiment 2

[0061] Milled AlGe 3 P: Feed Al powder, Ge powder, and P powder according to the stoichiometric ratio = 1:3:1, that is, take 0.2938g of Al powder, 2.3688g of Ge powder, and 0.3374g of P powder, a total of 3g. Then the raw materials are put into the ball mill jar, then 25 stainless steel balls (ball-to-material ratio=20:1) are put into the ball mill jar, and then argon gas is filled in the glove box (because Al is easily oxidized, the amount of Al weighed in the glove box ), after filling, seal well, every 1h of ball milling is intermittent for 25min, the rotating speed is 1200r, the total ball milling time is 10h, one-way rotation, XRD measured after ball milling. See XRD figure 2 . (The broad peak between 10°-25° is the peak of polyimide tape)

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Abstract

The invention provides a negative electrode active material for a lithium ion battery, which is a compound AlGe of the structure shown in formula (I) X P formula (I). The present invention uses the high-energy ball milling method to simultaneously introduce aluminum, germanium, and phosphorus (P) elements with lithium reactivity into a sphalerite structure of a component for the first time to synthesize AlGe 6 P material. Due to the synergy between Al, Ge, and P, the material has the advantages of high initial first-effect Coulombic efficiency and high capacity. The present invention synthesized AlGe X P (1≤X≤6, x can be an integer or a decimal) series materials, thereby reducing the cost of materials, and the theoretical specific capacity of the AlGeP material with the least Ge content is the highest in this series of materials, and the same The material also has the advantages of high initial first-effect Coulombic efficiency, high capacity, low cost, and small difference in charging and discharging voltage platforms.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode active material, a preparation method thereof and a lithium ion battery. Background technique [0002] With the emergence of portable devices (mobile phones, computers, Bluetooth headsets, bracelets, etc.), this brings great convenience to people, but the battery life of these portable devices is extremely weak in today's fast-playing life. , so it is imminent to improve the storage capacity of energy storage devices. Among the existing secondary batteries, the lithium-ion battery has many advantages such as the highest energy density, environmental friendliness, no memory effect, light weight, and small volume, and has received extensive attention. [0003] Today's commercial lithium-ion batteries mainly use graphite as the negative electrode material, but this material has two obvious disadvantages. First: the capacity is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/08H01M4/136H01M4/58H01M10/0525
CPCC01B25/088H01M4/5805H01M4/136H01M10/0525C01P2002/72C01P2006/40Y02E60/10
Inventor 李文武沈鹏飞陈霆熙马齐斌张海燕
Owner GUANGDONG UNIV OF TECH