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Activated carbon/lithium titanate composite electrode material, preparation method and supercapacitor

A composite electrode and lithium titanate technology, which is applied in the manufacture of battery electrodes, non-aqueous electrolyte batteries, electrolyte batteries, etc., can solve the problem of reducing the pore volume of activated carbon and the specific surface area of ​​composite materials, and insufficient contact between lithium titanate and electrolyte , affect the power density of capacitors and other issues, and achieve the effects of large-scale production, low cost, and high mesoporosity

Inactive Publication Date: 2015-10-14
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that it will cause pore blocking, reduce the pore volume of activated carbon and the specific surface area of ​​the composite material, which is not conducive to the full play of its adsorption performance.
In addition, lithium-ion hybrid supercapacitors with lithium titanate as the negative electrode use organic electrolytes. Due to the large molecules of organic electrolytes, it is difficult to transport in activated carbon mainly composed of micropores, resulting in insufficient contact between lithium titanate and the electrolyte. Affects the improvement of capacitor power density

Method used

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  • Activated carbon/lithium titanate composite electrode material, preparation method and supercapacitor
  • Activated carbon/lithium titanate composite electrode material, preparation method and supercapacitor
  • Activated carbon/lithium titanate composite electrode material, preparation method and supercapacitor

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preparation example Construction

[0022] Please refer to figure 1 , a preparation method of activated carbon / lithium titanate composite electrode material, comprising the following steps:

[0023] S1: According to the atomic ratio of lithium (Li) and titanium (Ti) being 0.80~0.90:1, dissolving lithium acetate dihydrate and titanium alkoxide in an alcoholic solvent to obtain a first solution;

[0024] S2: according to phenolic resin and titanium alkoxide mass ratio is 3~6:1, phenolic resin is dissolved in the alcoholic solvent, obtains the second solution;

[0025] S3: mixing the first solution with the second solution, and polymerizing to form a yellow polymer;

[0026] S4: Stir the yellow polymer, seal it, heat it with a solvent at 140-200° C. for 4-10 hours, take it out and dry it to obtain the precursor powder of lithium titanate / phenolic resin;

[0027] S5: Physically activate the precursor powder with carbon dioxide gas, the activation temperature is 700-900° C., and the activation time is 2-5 hours, to...

Embodiment 1

[0036] In a stirring state, add an appropriate amount of lithium acetate monohydrate and tetrabutyl titanate to 20 ml of ethanol at a ratio of Li atom to Ti atom of 0.85:1 to obtain the first solution; according to the mass ratio of phenolic resin and tetrabutyl titanate 5:1, an appropriate amount of phenolic resin was dissolved in 50ml ethanol to obtain the second solution; the first solution was added to the second solution to form a yellow polymer; the polymer product was stirred evenly, and then transferred into a stainless steel reaction kettle with a volume of 100ml , after sealing, solvent heat treatment at 160°C for 8h, take it out and dry it directly at 70°C to obtain the lithium titanate / phenolic resin precursor powder; the obtained lithium titanate / phenolic resin precursor powder was The physical activation is carried out in a carbon dioxide gas atmosphere, the activation temperature is 800 ° C, and the activation time is 4 h, that is, the activated carbon / lithium ti...

Embodiment 2

[0039] It is basically the same as Example 1, except that titanium isopropoxide is used instead of tetrabutyl titanate as the titanium source.

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Abstract

The invention discloses a preparation method of an activated carbon / lithium titanate composite electrode material. The preparation method comprises the following steps: dissolving lithium acetate dehydrate and titanium alkoxides into alcohols solvents according to the atom ratio of Li to Ti being (0.80-0.90) to 1 to obtain a first solution; dissolving phenolic resin into the alcohols solvents according to the mass ratio of phenolic resin to titanium alkoxides being (3-6) to 1 to obtain a second solution; mixing the first solution and the second solution, and polymerizing; stirring the polymer, sealing, heating the solvents for 4-10h at 140-200 DEG C, taking out, and drying to obtain precursor powder; physically activating the precursor powder by utilizing carbon dioxide gas to obtain the activated carbon / lithium titanate composite electrode material, wherein the activating temperature is 700-900 DEG C, and the activating time is 2-5h. The invention also provides the activated carbon / lithium titanate composite electrode material obtained by the method, and a supercapacitor using the composite material.

Description

technical field [0001] The invention relates to an activated carbon / lithium titanate composite electrode material, a preparation method and a supercapacitor containing the activated carbon / lithium titanate composite electrode material, in particular to an activated carbon / lithium titanate composite electrode for lithium ion hybrid supercapacitors Materials and preparation methods. Background technique [0002] At present, Li-ion Hybrid Supercapacitor (Li-ion Hybrid Supercapacitor) is a new type of electrochemical energy storage device developed in recent years. The material has reversible adsorption and desorption of lithium ions. Therefore, its energy density is higher than that of conventional capacitors, and its power density is higher than that of lithium-ion batteries. Wide application potential. [0003] The energy density of lithium-ion hybrid supercapacitors is determined by the amount of charge stored in the capacitively active material, while the power density is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/058
CPCH01M4/362H01M4/485H01M10/058Y02E60/10Y02P70/50
Inventor 姜春海邹智敏
Owner XIAMEN UNIV OF TECH
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