Lithium-supplementing modified silicon material as well as preparation method and application thereof

A technology for modifying silicon and silicon materials, applied in the preparation/purification of carbon, silicon, silicate, etc., can solve the problems of dangerous operation, difficulty in uniformly dispersing lithium, unsafe, etc., to solve uneven mixing, process steps Less and more efficient lithium doping effect

Pending Publication Date: 2022-03-22
HUNAN KINGI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is aimed at the negative electrode sheet that has been formed. Since the material structure of the electrode sheet is relatively stable, the effect of lithium supplementation on the electrode sheet is poor, and the supplemented lithium is difficult to disperse evenly.
On the other hand, lithium flakes (i.e. metal lithium) are oxidized when exposed to air, and violent heat generation when exposed to water can cause explosions. The entire reaction operation is dangerous, unsafe, and difficult for industrial application.

Method used

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  • Lithium-supplementing modified silicon material as well as preparation method and application thereof
  • Lithium-supplementing modified silicon material as well as preparation method and application thereof
  • Lithium-supplementing modified silicon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1) Preparation of organolithium solution: in an environment of 5°C and argon atmosphere, weigh 95g of methyl bromide and 8g of metal lithium and stir them with a magnetic stirrer to completely dissolve them in 200mL of ether (analytical pure AR), stirring time At 2h, a suspension A was obtained; the suspension A was filtered to obtain a pure organolithium solvent B;

[0046] In a normal environment, weigh 300g of silicon oxide and completely disperse it in 1000mL of deionized water to obtain silica slurry C;

[0047] Step 2) Mixing: Mechanically mix the organic lithium solvent B with the silicon-oxygen slurry C, and the mechanical mixing time is 5 hours to obtain the lithium-supplementing modified silicon-oxygen slurry D; place the lithium-supplementing modified silicon-oxygen slurry D on Carry out suction filtration and water washing in the suction filtration bottle, the number of times of water washing is 3 times, place the lithium-supplementing modified silicon-...

Embodiment 2

[0051] Step 1) Preparation of organolithium solution: in an environment of 5°C and argon atmosphere, weigh 95g of methyl bromide and 8g of metal lithium and stir them with a magnetic stirrer to completely dissolve them in 200mL of ether (analytical pure AR), stirring time At 2h, a suspension A was obtained; the suspension A was filtered to obtain a pure organolithium solvent B;

[0052] In a normal environment, weigh 300g of silicon oxide and completely disperse it in 1000mL of deionized water to obtain silica slurry C;

[0053] Step 2) Mixing: Mechanically mix the organic lithium solvent B with the silicon-oxygen slurry C, and the mechanical mixing time is 5 hours to obtain the lithium-supplementing modified silicon-oxygen slurry D; place the lithium-supplementing modified silicon-oxygen slurry D on Carry out suction filtration and water washing in the suction filtration bottle, the number of times of water washing is 3 times, place the lithium-supplementing modified silicon-...

Embodiment 3

[0057] Step 1) Preparation of organolithium solution: in an environment of 5°C and argon atmosphere, weigh 95g of methyl bromide and 10g of metal lithium and stir them with a magnetic stirrer to completely dissolve them in 200mL of ether (analytical pure AR), stirring time At 3h, a suspension A was obtained; the suspension A was filtered to obtain a pure organolithium solvent B;

[0058] In a normal environment, weigh 300g of silicon oxide and completely disperse it in 1000mL of deionized water to obtain silica slurry C;

[0059] Step 2) Mixing: Mechanically mix the organic lithium solvent B with the silicon-oxygen slurry C, and the mechanical mixing time is 5 hours to obtain the lithium-supplementing modified silicon-oxygen slurry D; place the lithium-supplementing modified silicon-oxygen slurry D on Carry out suction filtration and water washing in the suction filtration bottle, the number of times of water washing is 4 times, place the lithium-supplementing modified silicon...

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Abstract

The invention discloses a lithium-supplementing modified silicon material as well as a preparation method and application thereof. The method comprises the following steps: reacting halogenated organic matters with metal lithium powder in an organic solvent in a protective atmosphere at the temperature of not higher than 10 DEG C, and filtering to obtain an organic lithium solution; uniformly dispersing a silicon material into a solvent to obtain slurry I; uniformly mixing an organic lithium solution with the slurry I to obtain slurry II; the slurry II is sequentially washed, filtered, dried and calcined to obtain the lithium-supplementing modified silicon material, the material is high in lithium supplementing quality, the problems that the initial coulombic efficiency of the silicon material is low and the like can be solved, meanwhile, a uniform carbon protection layer is formed on the surface of the silicon material, the conductivity of the silicon material can be improved, and a stable chemical and electrochemical reaction interface can be provided; the problem of volume expansion of the silicon material in the charging and discharging process is relieved, and the preparation method of the lithium-supplementing modified silicon material is low in environmental requirement, mild and simple in process and controllable in lithium supplementing quality, and has relatively good economical efficiency and safety.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material, in particular to a lithium-supplementing modified silicon material and a preparation method and application thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in portable electrical appliances such as mobile phones and notebook computers, and are deeply loved by users; electric vehicles also have very good application prospects in the future, and will have a profound impact on people's lives in the future. The capacity and cycle performance of lithium-ion batteries have been continuously improved, and lithium-ion batteries with larger capacity, lighter weight, smaller volume, thinner thickness, and lower price are constantly being introduced to the market. New electrode materials and electrolyte materials are continuously developed, which have the advantages of large capacity, low price, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B33/32C01B33/12C01B33/02C01B32/956H01M4/38H01M4/48H01M4/62H01M10/0525H01M10/42
CPCC01B32/05C01B33/32C01B33/12C01B33/02C01B32/956H01M4/386H01M4/483H01M4/625H01M10/0525H01M10/4235C01P2004/80C01P2006/40Y02E60/10
Inventor 易旭廖寄乔
Owner HUNAN KINGI TECH CO LTD
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