Preparation method of nanocrystal lithium-rich single-phase Li-Si compound block material

A technology of bulk materials and compounds, which is applied in the field of preparation of nanocrystalline lithium-rich single-phase Li-Si compound bulk materials, can solve the problems of unreported preparation method and limited preparation technology of nano-structured Li-Si alloys.

Active Publication Date: 2012-10-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the preparation technology of Li-Si alloy in pure phase is very limited at present, and the preparation method of Li-Si alloy with nanostructure has not been reported.

Method used

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  • Preparation method of nanocrystal lithium-rich single-phase Li-Si compound block material
  • Preparation method of nanocrystal lithium-rich single-phase Li-Si compound block material
  • Preparation method of nanocrystal lithium-rich single-phase Li-Si compound block material

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Experimental program
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Effect test

Embodiment 1

[0023] (1) With nanocrystalline single-phase Li 7 Si 3The compound bulk material is the final target material. According to the atomic ratio of 2.3:1 (x=2.3), the corresponding mass of Li flakes and Si powder was weighed, and an additional Li flake weighing 3% of the mass of Li flakes was added to compensate for the loss of Li during the preparation process. Using a mold made of cemented carbide as a container, put a small amount of Si powder into the mold to cover the bottom surface of the mold in an argon-filled glove box (ambient oxygen content 7 Si 3 alloy ingots.

[0024] (2) In a glove box filled with argon gas, Li 7 Si 3 The alloy ingot was crushed into powder, and put into a ball mill jar according to the ball mass ratio of 60:1, the ball milling speed was 500r / min, and the ball milling time was 16 hours to obtain amorphous Li x Si alloy powder.

[0025] (3) In an argon-filled glove box, the amorphous Li 7 Si 3 The alloy powder is put into a cemented carbide mo...

Embodiment 2

[0028] (1) With nanocrystalline single-phase Li 7 Si 3 The compound bulk material is the final target material. According to the atomic ratio of 2.3:1 (x=2.3), the corresponding mass of Li flakes and Si powder were weighed, and Li flakes weighing 4% of the mass of Li flakes were additionally added to compensate for the loss of Li during the preparation process. Using a mold made of cemented carbide as a container, put a small amount of Si powder into the mold to cover the bottom surface of the mold in an argon-filled glove box (ambient oxygen content 7 Si 3 alloy ingots.

[0029] (2) In a glove box filled with argon gas, Li 7 Si 3 The alloy ingot was crushed into powder, and put into a ball mill jar according to the mass ratio of ball to material of 60:1, the ball mill speed was 700r / min, and the ball mill time was 12 hours to obtain Li 7 Si 3 alloy powder.

[0030] (3) In an argon-filled glove box, the amorphous Li 7 Si 3 The alloy powder is loaded into a cemented ca...

Embodiment 3

[0033] (1) With nanocrystalline single-phase Li 13 Si 4 The compound bulk material is the final target material. According to the atomic ratio of 3.3:1 (x=3.3), the corresponding mass of Li flakes and Si powders were weighed, and Li flakes weighing 4% of the Li flake mass were additionally added to compensate for the loss of Li during the preparation process. Using a mold made of cemented carbide as a container, put a small amount of Si powder into the mold to cover the bottom surface of the mold in an argon-filled glove box (ambient oxygen content 13 Si 4 alloy ingots.

[0034] (2) In a glove box filled with argon gas, Li 13 Si 4 The alloy ingot was crushed into powder, and put into a ball mill jar according to the ball mass ratio of 60:1, the ball milling speed was 500r / min, and the ball milling time was 16 hours to obtain amorphous Li 13 Si 4 alloy powder.

[0035] (3) In an argon-filled glove box, the amorphous Li 13 Si 4 The alloy powder is put into a cemented ca...

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Abstract

The invention discloses a preparation method of a nanocrystal lithium-rich single-phase Li-Si compound block material, belonging to the technical field of nanometer functional materials. The preparation method comprises the steps of: firstly weighing certain quantity of Li and Si according to target components and preparing a LixSi alloy ingot by utilizing a discharge plasma sintering technology; crushing the alloy ingot into powder and then ball-milling to obtain alloy powder in an amorphous structure; and finally sintering-molding the amorphous powder rapidly by utilizing the discharge plasma sintering technology to obtain a single-phase LixSi nanocrystal block material. The preparation method of the nanocrystal lithium-rich single-phase Li-Si compound block material, disclosed by the invention, has the advantages of pure phase, fine crystal particles, high density, simple and practicable process route and short synthetic cycle.

Description

technical field [0001] The invention discloses a method for preparing a nanocrystalline lithium-rich single-phase Li-Si compound block material, which belongs to the technical field of nano functional materials. Background technique [0002] Lithium-ion batteries have become the first choice for rechargeable sources of portable electronic products due to their high capacity, long cycle life, and high cost performance. In the development process of lithium-ion batteries, the development of negative electrode materials occupies an important position, and its characteristics directly affect the performance of lithium-ion batteries, and may become a bottleneck restricting the wide-scale application of lithium-ion batteries. Therefore, the design and development of new lithium-ion battery anode materials with excellent charge and discharge performance is the focus of research and development in the battery industry. [0003] In lithium-ion batteries, the negative electrode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F3/105
Inventor 宋晓艳贺将韬徐文武刘泉宏
Owner BEIJING UNIV OF TECH
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