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Lithium ion battery negative material, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of long preparation time, unfavorable large-scale production, cumbersome preparation steps, etc., and achieve high specific capacity and high electrochemical cycle Effects of performance and rate capability

Active Publication Date: 2016-07-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method alleviates the volume effect of silicon to a certain extent, but the conditions and time for adding each component are relatively strictly limited, the reaction temperature is high, the preparation time is long, the preparation steps are cumbersome, and the controllability is poor, which is not conducive to mass production

Method used

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  • Lithium ion battery negative material, preparation method thereof and lithium ion battery
  • Lithium ion battery negative material, preparation method thereof and lithium ion battery
  • Lithium ion battery negative material, preparation method thereof and lithium ion battery

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preparation example Construction

[0034] The present invention provides a kind of preparation method of above-mentioned negative electrode material of lithium ion battery, comprises the following steps:

[0035] Mixing n-hexane, emulsifier, n-pentanol, deionized water, organic ligands and nano silicon powder to obtain the first microemulsion;

[0036] mixing n-hexane, emulsifier, n-pentanol, deionized water and metal inorganic salts to obtain a second microemulsion;

[0037] The first microemulsion and the second microemulsion are mixed and reacted, and the reaction product is subjected to carbonization treatment to obtain a lithium ion battery negative electrode material.

[0038] The method for preparing the first microemulsion is preferably:

[0039] Dispersing the organic ligand and nano silicon powder in deionized water to obtain the first mixed solution;

[0040] Mix n-hexane, emulsifier and n-pentanol evenly to obtain a second mixed solution;

[0041] Uniformly mixing the first mixed liquid and the sec...

Embodiment 1

[0063] Disperse the nano-silica powder in ethanol, heat it in a water bath to 60°C, add 3-aminopropyltriethoxysilane (APTES) under the condition of stirring, stir at constant temperature for 3 hours, cool to room temperature, and then add under the condition of stirring Succinic anhydride, continue to stir for 4 hours to obtain carboxylated modified nano-silicon powder; the mass ratio of the nano-silicon powder, ethanol, APTES and succinic anhydride is 200:118:1:400.

[0064] Uniformly mixing n-hexane, Span 80, n-pentanol, deionized water, 2-methylimidazole and carboxylated-modified nano silicon powder to obtain the first microemulsion. Among them, the mass ratio of 2-methylimidazole, carboxylated nano silicon powder, Span 80 and deionized water is 25:25:1400:4, and the volume ratio of n-hexane, n-pentanol and deionized water is 50 :25:1.

[0065] Mix n-hexane, Span 80, n-amyl alcohol, deionized water and zinc nitrate hexahydrate uniformly to obtain the second microemulsion. ...

Embodiment 2

[0072]Disperse the nano-silica powder in ethanol, heat it in a water bath to 60°C, add 3-aminopropyltriethoxysilane (APTES) under the condition of stirring, stir at constant temperature for 3 hours, cool to room temperature, and then add under the condition of stirring Succinic anhydride, continue to stir for 8 hours to obtain carboxylated nano-silicon powder; the mass ratio of the nano-silicon powder, ethanol, APTES and succinic anhydride is 300:180:1.5:600.

[0073] Uniformly mixing n-hexane, Span 80, n-pentanol, deionized water, trimesic acid and carboxylated nano-silica powder to obtain the first microemulsion. Among them, the mass ratio of trimesic acid, carboxylated nano silicon powder, Span 80 and deionized water is 2:1:1750:5, and the volume ratio of n-hexane, n-pentanol and deionized water is 60: 30:1.

[0074] Mix n-hexane, Span 80, n-amyl alcohol, deionized water and copper nitrate trihydrate uniformly to obtain the second microemulsion. Among them, the mass ratio...

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Abstract

The invention provides a lithium ion battery negative material. The lithium ion battery negative material comprises nano silicon particles and carbon material particles, wherein the nano silicon particles are uniformly dispersed among the carbon material particles to form microspheres; and the carbon material particles are carbonized metallic organic skeleton materials. The microsphere structural silicon-carbon composite material is obtained by adopting a micro-emulsion method. Compared with the prior art of embedding nano silicon into each single carbon material particle to form a core-shell structure, a lithium ion battery manufactured with the negative material has higher electrochemical cycling performance and multiplying power performance; and meanwhile, the preparation method is simple and easy, and is low in reaction temperature, short in preparation time, good in controllability and favorable for mass production. An experiment shows that the primary discharge specific capacity of the prepared lithium ion battery at the multiplying power of 0.1C is 1800 to 2069 mAh / g, and after the lithium ion battery is circulated for 120 times, the discharge specific capacity is 1000 to 1280 mAh / g.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, wide operating temperature range, stable discharge, small size, light weight, no memory effect, and environmental friendliness. Therefore, they are widely used in portable electronic devices, electric vehicles, space technology, and defense industries. and other fields have shown broad application prospects. [0003] With the increasing demand for high-capacity and long-life batteries in mobile electronic devices, people have put forward higher requirements for the performance of lithium-ion batteries. As an important factor to improve the energy and cycle life of lithium-ion batteries, negative electrode materials are in the world. has been...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 张可利杨正东夏永高刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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