Negative pole material of lithium ion battery, preparation method of material and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as electrode structure instability, negative electrode material structure collapse, and complex preparation processes, so as to improve electrical conductivity, good cycle performance, The effect of high capacity performance

Active Publication Date: 2013-01-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Benefits of technology

This patented technology describes different ways to make batteries without harmful chemical substances such as lead or mercury. It involves mixing certain ingredients together beforehand into a mixture called solvent (water) through stirring processes like adding water during manufacturing). By doing this, it forms cores/clusters around particles made up mostly of tin dioxycore and titania clathrate. These cores help absorb more Li+ than pure tin dioxygen while also improving their capacity when charged and used in Lithium Ion Batteries. Additionally, these new techniques involve modifying the surface chemistry of both components separately instead of combining them altogether. Overall, they provide technical benefits over existing methods but have improved efficiency compared to previous ones due to the use of specific starting materials and unique structures within each component's particle surfaces.

Problems solved by technology

This technical problem addressed in this patents relates to finding ways to make lithiated graphite positive elec trodes safer while maintain their cycling stability. Current methods involve adding large amounts of silicon into the cathodes themselves without addressing these challenges.

Method used

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  • Negative pole material of lithium ion battery, preparation method of material and lithium ion battery
  • Negative pole material of lithium ion battery, preparation method of material and lithium ion battery
  • Negative pole material of lithium ion battery, preparation method of material and lithium ion battery

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preparation example Construction

[0037] The invention provides a kind of preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0038] Mix the tin dioxide hydrosol with the ethyl orthosilicate absolute ethanol solution, adjust the pH value to 10-13 after 0.5h-2h, and obtain tin dioxide nanoparticles coated with silicon dioxide;

[0039]Mixing the tin dioxide nanoparticles coated with silicon dioxide with an anhydrous ethanol solution containing a coupling agent and a titanium compound, aging for 1h~6h, and obtaining a precipitate after 5h~10h;

[0040] The precipitate is washed with hydrofluoric acid to obtain the washed precipitate;

[0041] The washed precipitate is mixed with graphene, dried and annealed to obtain the lithium ion battery negative electrode material.

[0042] The present invention utilizes the high-capacity performance of tin dioxide, the morphological stability performance of titanium dioxide, the conductivity performance of graphene, etc.,...

Embodiment 1

[0069] Dissolve 2g of stannous chloride in 300mL of absolute ethanol, stir well to obtain stannous chloride in absolute ethanol; slowly drop 100mL of glacial acetic acid solution with a pH value of 4.5 into the stannous chloride in absolute ethanol Carry out reaction, stir 3h, obtain tin dioxide hydrosol;

[0070] Add a 5% tetraethyl orthosilicate absolute ethanol solution dropwise into the tin dioxide hydrosol, stir for 0.5 h and then adjust the pH value to 10 to obtain tin dioxide nanoparticles coated with silicon dioxide ;

[0071] Drop 8mL KH550 into 100mL of absolute ethanol, and then add 1mL of tetrabutyl titanate to it to obtain an absolute ethanol solution containing KH550 and tetrabutyl titanate, which is dropped into the silicon dioxide-coated In the tin oxide nanoparticles, after vigorously stirring for 5 hours, aging was carried out at room temperature, and a precipitate was obtained after 10 hours;

[0072] Described precipitate is carried out transmission elect...

Embodiment 2

[0080] Dissolve 2g of stannous chloride in 400mL of absolute ethanol, stir well to obtain stannous chloride in absolute ethanol; slowly drop 100mL of glacial acetic acid solution with a pH value of 1 into the stannous chloride in absolute ethanol Carry out reaction, stir 3h, obtain tin dioxide hydrosol;

[0081] Adding an absolute ethanol solution of tetraethyl orthosilicate with a mass concentration of 10% into the tin dioxide hydrosol, stirring for 2 hours and adjusting the pH value to 12 to obtain tin dioxide nanoparticles coated with silicon dioxide;

[0082] Add 8 mL of KH570 dropwise into 100 mL of absolute ethanol, and then add 1 mL of tetrabutyl titanate to it to obtain an absolute ethanol solution containing KH570 and tetrabutyl titanate, which is dropped into the silicon dioxide-coated In the tin oxide nanoparticles, after vigorously stirring for 5 hours, aging was carried out at room temperature, and a precipitate was obtained after 10 hours;

[0083] The precipita...

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Abstract

The invention provides a negative pole material of a lithium ion battery and a preparation method of the material. The method comprises the following steps of: firstly mixing tin-dioxide hydrosol and a tetraethoxysilane absolute ethyl alcohol solution, adjusting the pH value to be at 10-13 after 0.5-2 hours, so as to obtain tin-dioxide nano particles coated with silicon dioxide, then mixing the tin-dioxide nano particles with an absolute ethyl alcohol solution containing a coupling agent and a titanium-containing compound, carrying out ageing after 1-6 hours, so as to obtain precipitates after 5-10 hours, cleaning with hydrofluoric acid, and finally mixing with graphene, drying and annealing so as to obtain the negative pole material of the lithium ion battery. The negative pole material comprises a tin dioxide nucleus, a titanium dioxide shell which is spaced from the tin dioxide nucleus by a hollow layer, and graphene coating on the titanium dioxide shell. The negative material provided by the invention has the advantages that in the charging and discharging processes, the volume change of tin dioxide can be effectively buffered; the titanium dioxide shell is coated by the graphene, so that the conductivity can be improved and the cycling performance of the negative pole material can be improved. The invention also provides the lithium ion battery.

Description

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Claims

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Application Information

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Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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