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Positive electrode lithium supplementing material and preparation method and application thereof

A positive electrode material and lithium supplement technology, applied in the field of energy storage, can solve the problem that the effect of lithium supplement is difficult to further improve

Active Publication Date: 2022-04-12
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is difficult to further improve the lithium supplementation effect of existing positive electrode lithium supplementation agents. How to develop new lithium supplementation agents with better lithium supplementation effects is a problem that needs to be solved in this field

Method used

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  • Positive electrode lithium supplementing material and preparation method and application thereof
  • Positive electrode lithium supplementing material and preparation method and application thereof
  • Positive electrode lithium supplementing material and preparation method and application thereof

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preparation example Construction

[0036] In the second aspect, the present application provides a method for preparing a positive electrode lithium supplement material, which includes: mixing the lithium source, the silicon source, and the boron source, and then sintering; wherein, the B in the boron source and the Si in the silicon source The molar ratio is x:(1-x), 0<x≤0.2; the molar ratio of Li in the lithium source to Si in the silicon source is (1.6-4.4):1.

[0037] Wherein, when the molar ratio of Li in the lithium source and Si in the silicon source is (1.6-2.2): 1, the core material prepared at this moment is a boron-doped lithium metasilicate material, when Li in the lithium source and the silicon source The Si molar ratio in Li is (3.2-4.4): 1, and the core material prepared at this time is a boron-doped lithium orthosilicate material, and when 2.2<Li and the Si molar ratio in the silicon source are <3.2, prepare The core material is a composite of boron-doped lithium orthosilicate material and boron...

Embodiment 1

[0053] Boron-doped lithium orthosilicate materials and boron-doped carbon-coated lithium orthosilicate materials (a1, a2, a3) were prepared.

[0054] Boron-doped lithium orthosilicate material (a1): the precursor obtained by mixing and ball-milling the corresponding raw materials in Table 1, and sintering the precursor in a tube furnace for the corresponding time in Table 1.

[0055] Carbon-coated boron-doped lithium orthosilicate (a2): the precursor obtained by mixing and ball-milling the corresponding raw materials in Table 1, and sintering the precursor in a tube furnace under the protection of argon.

[0056] Carbon-coated boron-doped lithium orthosilicate (a3): the precursor is obtained by mixing and ball-milling the corresponding raw materials in Table 1, putting the precursor into a tube furnace for sintering, and passing acetylene during the sintering process.

[0057] Table 1 Raw materials and reaction conditions of samples a1-a3

[0058]

[0059]

[0060] fig...

Embodiment 2

[0066] Boron-doped lithium orthosilicate materials and boron-doped carbon-coated lithium orthosilicate materials (b1, b2, b3) were prepared.

[0067] Among them, the boron-doped lithium orthosilicate material (b1): obtained by mixing the corresponding raw materials in Table 3 and ball milling to obtain a precursor, putting the precursor in a tube furnace and sintering the corresponding time in Table 3 under the protection of argon.

[0068] Carbon-coated boron-doped lithium orthosilicate (b2): the precursor obtained by mixing and ball-milling the corresponding raw materials in Table 3, and sintering the precursor in a tube furnace under the protection of argon.

[0069] Carbon-coated boron-doped lithium orthosilicate (b3): ​​the precursor is obtained by mixing and ball-milling the corresponding raw materials in Table 3, putting the precursor into a tube furnace for sintering, and feeding ethylene during the sintering process.

[0070] Table 3 Raw materials and reaction conditi...

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Abstract

The invention discloses an anode lithium supplementing material and a preparation method and application thereof, and belongs to the field of energy storage. The positive electrode lithium supplementing material comprises a core material, the core material is at least one of a boron-doped lithium orthosilicate material and a boron-doped lithium metasilicate material, the chemical formula of the boron-doped lithium orthosilicate material is Li4Si1-xBxO4, the chemical formula of the boron-doped lithium metasilicate material is Li2Si1-yByO3, x is greater than or equal to 0.001 and less than or equal to 0.2, and y is greater than or equal to 0.001 and less than or equal to 0.2. According to the arrangement, lithium orthosilicate and / or lithium metasilicate are / is used as a main body, and the boron-doped lithium silicate material formed by non-metallic element boron doping is used as a lithium supplement agent, so that the ionic conductivity of the lithium silicate material can be improved, the decomposition potential of the lithium silicate material can be reduced, the active lithium release of the lithium silicate lithium supplement material can be promoted, and the energy density and the cycle life of the lithium ion battery can be remarkably improved.

Description

technical field [0001] The present application relates to the field of energy storage, in particular, to a positive electrode lithium supplement material and its preparation method and application. Background technique [0002] Due to the advantages of small size, light weight, large specific capacity, long life, and no memory effect, lithium-ion batteries are widely used in portable electronic devices, power storage, and electric vehicles. Among them, the positive and negative materials are lithium The key to ion battery capacity and cycle performance. [0003] Lithium-ion energy storage devices, especially lithium secondary batteries, will form a solid electrolyte interface (SEI) on the surface of the negative electrode during the first cycle, resulting in irreversible lithium loss, resulting in a decrease in the energy density of lithium-ion batteries. Under the existing positive and negative electrode material systems, the improvement of the energy density of lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/04H01M4/58H01M10/0525
CPCY02E60/10
Inventor 闫勇黄学杰李文超田孟羽
Owner SONGSHAN LAKE MATERIALS LAB
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