Lithium ion battery negative material and preparation method thereof

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the unfavorable factors of battery capacity improvement, and achieve the effects of superior electrochemical performance, easy operation, and reduction of irreversible loss.

Active Publication Date: 2015-04-22
李震祺 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also literature reports on the embedded lithium technology of negative electrode materials. Ma Shuhua et al. artificially deposited a layer of Li on the mesophase microsphere graphite (MCMB) 2 CO 3 or LiOH film to pre-lithiate the negative electrode. After Guo Huajun et al. pre-doped the graphite negative electrode with lithium, the capacity of the battery and the coulombic efficiency of the first charge and discharge were significantly improved. At the same time, other elements are also introduced, which still has unfavorable factors for the improvement of battery capacity.

Method used

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  • Lithium ion battery negative material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First, 7g of metallic lithium powder was gradually dissolved in a Dewar flask containing 1L of liquid ammonia to form a 1mol / L dark blue lithium solution; secondly, 58.1g of propylene oxide was added to the above lithium solution under magnetic stirring conditions, Stir evenly to obtain a white sol solution; then, gradually add 120 g of natural graphite to the above sol solution while stirring, and stir for 1 hour to obtain a uniformly dispersed suspension; then, evaporate the above suspension to dryness at 60°C to obtain a precursor powder Grind the powder evenly and place it in a vacuum drying oven for 10 hours at 120°C for vacuum drying; finally, put the vacuum-dried powder into a corundum boat, and heat it at 600°C for 5 hours in an atmosphere furnace with nitrogen to obtain the pre-embedded Lithium's natural graphite material.

[0036] Electrochemical performance test: The above-mentioned pre-lithiated graphite, binder (PVDF) and conductive agent acetylene black ar...

Embodiment 2

[0038] Dissolve 7g of lithium metal powder successively in a Dewar flask containing 1L of liquid ammonia to form a 1mol / L dark blue lithium solution; add 58.1g of propylene oxide to the above lithium solution under magnetic stirring conditions, and stir evenly to obtain A white sol solution; gradually add 120g of graphene to the above sol solution while stirring, and stir for 0.5h to obtain a uniformly dispersed suspension; evaporate the above suspension to dryness at 60°C to obtain a precursor powder, and grind the powder evenly Put it in a vacuum drying oven at 120°C for 10 hours; put the vacuum-dried powder into an atmosphere furnace with nitrogen, and heat it at 600°C for 5 hours to obtain a graphene material with embedded lithium.

[0039] The electrochemical performance testing method and conditions are the same as those in Example 1 above.

Embodiment 3

[0041]Dissolve 7g of lithium metal powder successively in a Dewar flask containing 1L of liquid ammonia to form a 1mol / L dark blue lithium solution; add 58.1g of propylene oxide to the above lithium solution under magnetic stirring conditions, and stir evenly to obtain A white sol solution; gradually add 60g of mesocarbon microspheres to the above sol solution while stirring, stir for 0.5h to obtain a uniformly dispersed suspension, evaporate the above suspension to dryness at 60°C to obtain a precursor powder; powder After grinding evenly, place it in a vacuum drying oven for 10 hours at 120°C for vacuum drying; put the vacuum-dried powder into an atmosphere furnace with nitrogen, and heat it at 600°C for 5 hours to obtain the lithium-embedded mesophase carbon microsphere material.

[0042] The electrochemical performance testing method and conditions are the same as those in Example 1 above.

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Abstract

The invention discloses a lithium ion battery negative material and a preparation method thereof. The preparation method comprises the following steps: firstly adding metallic lithium to a non-aqueous solvent to dissolve to form a lithium solution; then adding a complexing agent of which the weight is 1-1.2 times more than the molar weight of the metallic lithium to the lithium solution to obtain a sol solution; then adding a negative material, stirring to obtain suspension liquid; then evaporating the suspension liquid to dryness at the temperature of 30-80 DEG C to obtain a precursor, uniformly grinding, then placing into a vacuum drying box, drying at 120 DEG C for 8-12 hours, and cooling with a furnace; and finally loading the powder obtained by grinding and drying into a corundum boat, placing the corundum boat into a cavity of an inert atmosphere furnace, and sintering at the temperature of 400-800 DEG C for 2-6 hours. According to the preparation method disclosed by the invention, previous lithiation treatment is carried out on the negative material by adopting the lithium sol solution, lithium ions are provided for the formation of an SEI film in a first-time charge-discharge process, the loss of positive lithium ions is reduced and the first-time charge-discharge coulomb efficiency, capacity and circulating property of the negative material are greatly improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery pre-embedded lithium negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a colossal success of the modern electrochemical discipline, with annual sales of $27 billion, the undisputed dominance of the rechargeable battery market. From the perspective of the development of lithium-ion batteries, the research on negative electrode materials plays a decisive role in the development of lithium-ion batteries. It is precisely because of the emergence of carbon materials that solves the safety problem of metal lithium electrodes that it really promotes the emergence and development of lithium-ion batteries. . The first charge and discharge coulombic efficiency is a very important performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M4/62H01M10/0525Y02E60/10
Inventor 李震祺刘立君宋翠环
Owner 李震祺
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