Negative composite material for lithium-ion battery and preparation method of negative composite material

A lithium-ion battery and composite material technology, which is applied in the field of lithium-ion battery negative electrode materials and its preparation, can solve problems such as impact and poor battery safety performance, and achieve high Coulombic efficiency, high specific capacity, and good rate performance.

Active Publication Date: 2016-01-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after carbon material treatment, the same solid electrolyte interfacial film (SEI) as that formed by traditional carbon materials will be formed on the electrode and electrolyte surface, which will still have a negative impact on the safety performance of the battery.

Method used

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  • Negative composite material for lithium-ion battery and preparation method of negative composite material
  • Negative composite material for lithium-ion battery and preparation method of negative composite material
  • Negative composite material for lithium-ion battery and preparation method of negative composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) According to the chemical formula xLi 3 VO 4 ·(1-x)Li 4 Ti 5 o 12 , when x=0.75, take 12.61g of citric acid and dissolve it in 300mL of deionized water to form a colorless and transparent citric acid solution, and take 3.51g of ammonium metavanadate according to the molar ratio Li:V=3.0~3.2:1 and slowly add A wine-red transparent solution was formed in the citric acid solution, and after magnetic stirring at room temperature for 1 hour to fully complex, add 9.365 g of lithium acetate dihydrate as a lithium source, and continue stirring for 0.5 hours to form a transparent solution A;

[0027] (2) When x=0.75, according to the molar ratio Li:Ti=4.0~4.1:5, weigh 17.36g of tetrabutyl titanate and dissolve it in 100mL of absolute ethanol, stir at room temperature for 2h to form uniform tetrabutyl titanate Ethanol solution, then weighed 13.45g lithium acetate dihydrate and added thereto, and continued to stir for 1h to form light yellow transparent solution B;

[002...

Embodiment 2

[0031] (1) According to the chemical formula xLi 3 VO 4 ·(1-x)Li 4 Ti 5 o 12, when x=0.75, take 12.61g of citric acid and dissolve it in 300mL of deionized water to form a colorless and transparent citric acid solution, and take 3.51g of ammonium metavanadate according to the molar ratio Li:V=3.0~3.2:1 and slowly add A wine-red transparent solution was formed in the citric acid solution, and after magnetic stirring at room temperature for 1 hour to fully complex, add 9.365 g of lithium acetate dihydrate as a lithium source, and continue stirring for 0.5 hours to form a transparent solution A;

[0032] (2) When x=0.75, according to the molar ratio Li:Ti=4.0~4.1:5, weigh 17.36g of tetrabutyl titanate and dissolve it in 100mL of absolute ethanol, stir at room temperature for 2h to form uniform tetrabutyl titanate Ethanol solution, then weighed 13.45g lithium acetate dihydrate and added thereto, and continued to stir for 1h to form light yellow transparent solution B;

[0033...

Embodiment 3

[0036] (1) According to the chemical formula xLi 3 VO 4 ·(1-x)Li 4 Ti 5 o 12 , when x=0.75, take 12.61g of citric acid and dissolve it in 300mL of deionized water to form a colorless and transparent citric acid solution, and take 3.51g of ammonium metavanadate according to the molar ratio Li:V=3.0~3.2:1 and slowly add A wine-red transparent solution was formed in the citric acid solution, and after magnetic stirring at room temperature for 1 hour to fully complex, add 9.365 g of lithium acetate dihydrate as a lithium source, and continue stirring for 0.5 hours to form a transparent solution A;

[0037] (2) When x=0.75, according to the molar ratio Li:Ti=4.0~4.1:5, weigh 17.36g of tetrabutyl titanate and dissolve it in 100mL of absolute ethanol, stir at room temperature for 2h to form uniform tetrabutyl titanate Ethanol solution, then weighed 13.45g lithium acetate dihydrate and added thereto, and continued to stir for 1h to form light yellow transparent solution B;

[003...

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Abstract

The invention discloses a negative composite material for a lithium-ion battery and a preparation method of the negative composite material. The negative composite material for the lithium-ion battery is compounded according to the stoichiometric ratio of a chemical formula xLi<3>VO<4>.(1-x)Li<4>Ti<5>O<12> (wherein x is less than or equal to 1 and greater than or equal to 0.5). The preparation method comprises the following steps: weighing a lithium source and a vanadium source, adding an additive and a solvent or a complex agent and the solvent, and then forming a solution or slurry A; weighing the lithium source and a titanium source, adding the additive and the solvent or the complex agent and the solvent and then forming a solution or slurry B; and mixing the solution or slurry A with the solution or slurry B evenly through a liquid phase or solid phase method, and drying and sintering the mixture to obtain a Li<3>VO<4> or Li<4>Ti<5>O<12> two-phase composite material. With the obtained composite material as the negative material for the lithium-ion battery, the characteristics that lithium vanadate has proper intercalation/deintercalation potential and considerable capacity are fully utilized, so that the negative composite material for the lithium-ion battery has relatively high coulombic efficiency, relatively high specific capacity and good rate capability.

Description

technical field [0001] The invention belongs to the field of lithium battery materials, in particular to a Li 3 VO 4 and Li 4 Ti 5 o 12 Two-phase composite lithium ion battery negative electrode material and preparation method thereof. Background technique [0002] At present, graphite is widely used in anode materials for power lithium-ion batteries due to its high stability and cost-effectiveness. Its theoretical capacity is 372mAh / g, which belongs to the intercalation-extraction type lithium-ion anode material. However, during the charge and discharge process, the lithium intercalation potential of graphite is lower than 0.1V (vsLi / Li + ), resulting in the possibility of lithium dendrites piercing the separator during the cycle and causing a short circuit of the battery, thus causing safety hazards for power vehicles. In order to eliminate this phenomenon, researchers have worked hard for many years to find a negative electrode material with a suitable discharge pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M10/0525
CPCH01M4/362H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 马守龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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