A kind of preparation method of nano energy storage material and lithium ion battery containing it

A technology for lithium ion batteries and energy storage materials, which is applied in the field of preparation of lithium ion batteries and nano-silicon energy storage materials, can solve the problems of limited capacity improvement, lithium ion consumption, accelerated capacity, etc., and achieves good stretch recovery and buffer volume. Shrinkage changes and the effect of prolonging the service life

Active Publication Date: 2020-09-04
杨小旭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Silicon, tin, germanium and other materials are battery negative electrode materials with high specific capacity, but their large volume effect limits their application in battery materials to a large extent. There is a severe volume effect in the process of lithium intercalation and extraction. The repeated and dramatic changes in the volume of the negative electrode material lead to the continuous destruction and re-formation of the solid electrolyte protective film (SEI film) formed on the surface of the material, resulting in the continuous consumption of lithium ions and accelerating the capacity decay process. At the same time, the severe volume shrinkage will gradually separate from the current collector, crack and eventually fail
Most of the existing technologies use the blending modification of silicon and other substances. The blending proportion of silicon is generally lower than 10%, and the capacity improvement is limited, and the volume shrinkage problem of silicon that changes drastically during the charging and discharging process of lithium-ion batteries has not yet been solved.

Method used

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  • A kind of preparation method of nano energy storage material and lithium ion battery containing it
  • A kind of preparation method of nano energy storage material and lithium ion battery containing it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1. Select 100 parts of silicon particles with a D50 particle size of 300nm and 1.5 parts of siloxane coupling agent γ-aminopropyltriethoxysilane KH550, and after mechanical mixing, ultrasonically disperse them in absolute ethanol. Ultrasound at ℃ for 2 hours to carry out surface grafting treatment, filter and dry for later use;

[0032] Step 2. Add 8 parts of hexadecyltrimethoxysilane to 100 parts of aqueous solution at 30°C for 1 hour for hydrolysis, add 5 parts of the product from Step 1 as a nucleating substance and disperse evenly, heat up to 60°C, and the pH value is Polymerization coating of siloxane emulsion was carried out under weakly acidic conditions of 6, and the reaction time was 1 hour. At this time, the pH value was adjusted to 10, and then 10 parts of hexadecyltrimethoxysilane, 2 parts of tetrabutyl silicate The ester continued to react for 3 hours, and was filtered and dried to obtain D50 as a microsphere substance of 1.8 microns;

[0033] Step 3....

Embodiment 2

[0035] Step 1. Select 100 parts of silicon particles with a D50 particle size of 150nm and 2 parts of siloxane coupling agent γ-glycidyl ether propyl trimethoxysilane KH560, and disperse them in ethylene glycol by ultrasonic after mechanical mixing. Ultrasonic at 40°C for 2 hours to carry out surface grafting treatment, filter and dry for later use;

[0036] Step 2. Add 15 parts of dimethyldimethoxysilane to 100 parts of aqueous solution and hydrolyze at 30°C for 0.5 hours, add 8 parts of the product from Step 1 as a nucleating substance and disperse evenly, heat up to 50°C, and the pH value is Polymerization coating of siloxane emulsion was carried out under the neutral condition of 7, and the reaction time was 1 hour. At this time, the pH value was adjusted to 9, and 10 parts of phenyltrimethoxysilane was added to continue the reaction for 3 hours, filtered and dried to obtain D50 2.5 micron microspheres;

[0037]Step 3. Mix 10 parts of coke with 50 parts of synthetic sanda...

Embodiment 3

[0039] Step 1. Select 100 parts of silicon particles with a D50 particle size of 500nm and 2 parts of siloxane coupling agent γ-(methacryloyloxy)propyltrimethoxysilane KH570, and after mechanical mixing, ultrasonically disperse in anhydrous In ethanol, supersonicate at 50°C for 0.5 hours to carry out surface grafting treatment, filter and dry for later use;

[0040] Step 2. Add 5 parts of dimethyldiethoxysilane, 10 parts of cyclohexyltrimethoxy, and 3 parts of ethyl orthosilicate to 100 parts of aqueous solution at 30°C for 0.5 hours to hydrolyze 15 parts of the product of step 1 Add as a nucleating substance to disperse evenly, raise the temperature to 50°C, and carry out copolymerization coating of silicone emulsion under a weak alkalinity with a pH value of 8. The reaction time is 4 hours, and filter and dry to obtain microspheres with a D50 of 4 microns substance;

[0041] Step 3. Dissolve 10 parts of coal tar pitch in 40 parts of N-methylpyrrolidone, then add 20 parts of...

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Abstract

The invention discloses a preparation method of a nanometer silicon energy storage material and a lithium ion battery containing the same. The method comprises the following steps: step 1, taking a micro-nano particle of a group-IV element as an inner core to form inner core supporting; step 2, forming coating with a cross-linked network shaped structure for an inner core particle through an inorganic-organic silicon material; step 3, performing high temperature carbonization in an organic carbon-rich material to form external coating. The nanometer silicon energy storage material prepared through the method has a core-shell structure, nanometer silicon formed through reduction and depolymerization in the middle layer is orderly distributed in a cross-linked network shaped framework, a framework structure has good elasticity and resilience, and can effectively buffer violent volume shrinkage variation of an inner core material, and the service life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion electrode materials, and in particular relates to a preparation method of a nano-silicon energy storage material and a lithium-ion battery containing the same. Background technique [0002] At present, graphite materials are widely used in lithium battery negative electrode energy storage materials, and its capacity is only 372mAh / g, which cannot meet the current demand for high energy density batteries in the new energy industry, especially in recent years. The Action Plan” notice clearly pointed out the key indicators and time nodes of the current power battery as follows: by 2020, the specific energy of lithium-ion power battery cells should be > 300Wh / kg, and the specific energy of the system should reach 260Wh / kg. In order to achieve the technical goal of this industry, the industry is in urgent need of key materials with higher energy storage capacity: new materials such as ternary al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 杨小旭
Owner 杨小旭
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