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Preparation method for preparing lithium-rich composite cathode material of lithium ion super capacitor

A composite positive electrode material and supercapacitor technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of increasing the difficulty of making lithium ion capacitors, complex process requirements, and the inability to return lithium ions

Active Publication Date: 2016-06-08
安徽国研新能电芯技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that there is competition between activated carbon and the positive electrode material to adsorb lithium ions, resulting in the inability of lithium ions to return to the lattice of the positive electrode material, thereby deactivating the positive electrode material.
In order to solve this problem, the pores inside the activated carbon must be pre-filled with lithium ions, that is, pre-lithiation, which increases the difficulty of making lithium-ion capacitors, and the process requirements are very complicated, making it difficult to realize industrial production.

Method used

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  • Preparation method for preparing lithium-rich composite cathode material of lithium ion super capacitor
  • Preparation method for preparing lithium-rich composite cathode material of lithium ion super capacitor
  • Preparation method for preparing lithium-rich composite cathode material of lithium ion super capacitor

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Effect test

Embodiment 1

[0020] (1) Weigh 4.84gNi(NO 3 ) 2 ·6H 2 O, 4.85gCo(NO 3 ) 2 ·6H 2 O, 50%Mn(NO 3 ) 2 Dissolve 15.5 mL of the solution in deionized water to prepare a 0.50 mol / L soluble salt solution, then transfer the three salt solutions to the same container and mix and stir evenly to obtain about 200 mL of the mixed salt solution.

[0021] (2) Weigh 8.0g of NaOH, dissolve it in a certain amount of deionized water, prepare 200mL of 1mol / L NaOH solution, measure and dilute 25% ammonia solution to 15%, and add appropriate amount of ammonia water to NaOH.

[0022] (3) Add S to the mixed salt solution obtained in (1) at a stirring speed of 500rpm BET 2000m 2 10.66g of activated carbon per g, make it fully absorb the solute in the solution for 10h, then stop stirring.

[0023] (4) Place the three-neck flask containing about 20mL of deionized water bottom liquid in a water bath at a constant temperature of 60°C, under the protection of nitrogen, at a stirring speed of 500rpm, mix 200mL of...

Embodiment 2

[0028] (1) Weigh 4.84gNi(NO 3 ) 2 ·6H 2 O, 4.85gCo(NO 3 ) 2 ·6H 2 O, 50%Mn(NO 3 ) 2 Dissolve 15.5 mL of the solution in deionized water to prepare a 0.5 mol / L soluble salt solution, then transfer the three salt solutions to the same container and mix and stir evenly to obtain about 200 mL of the mixed salt solution.

[0029] (2) Weigh 8.0g of NaOH, dissolve it in a certain amount of deionized water, prepare 200mL of 1mol / L NaOH solution, measure and dilute 25% ammonia solution to 15%, and add appropriate amount of ammonia water to NaOH.

[0030] (3) Add S to the mixed salt solution obtained in (1) at a stirring speed of 500rpm BET 2000m 2 21.32g of gac per g, make it fully absorb the precipitate in the solution for 10h, then stop stirring.

[0031] (4) Place the three-neck flask containing about 20mL of deionized water bottom liquid in a water bath at a constant temperature of 60°C, under the protection of nitrogen, at a stirring speed of 500rpm, mix porous carbon wit...

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Abstract

The invention discloses a preparation method for preparing the lithium-rich composite cathode material of a lithium ion super capacitor. The method comprises the steps of dissolving a soluble nickel manganese cobalt salt in the deionized water in a certain proportion to obtain a mixed solution; dispersing the carbon material high in specific surface area in the above mixed solution; adopting the sodium hydroxide solution and the ammonia water as a precipitating agent and a complexing agent respectively; preparing a mixed suspending liquid of the nickel manganese cobalt salt according to the precipitation method and loading the mixed suspending liquid on the carbon surface and inside holes; filtering and washing with water to obtain an activated carbon-loaded precursor; mixing the precursor with a lithium source, and conducting the solid-phase sintering operation in a tube furnace in a specific atmosphere to obtain the target material. According to the technical scheme of the invention, under the dimensional limitations of porous carbon particles, the lithium-rich material is prevented from agglomerating and the crystal is prevented from growing excessively during the sintering process. Therefore, the material rate capability is improved. Meanwhile, during the preparation process, a lithium source of a super stoichiometric ratio is added, and the part of the lithium source deposits on the surface of the porous carbon material. Therefore, the shortage of the lithium source, caused by an SEI film and the competitive adsorption phenomenon during the first charging process, is compensated.

Description

technical field [0001] The invention relates to a method for preparing an activated carbon-loaded lithium-rich cathode composite material for lithium-ion supercapacitors. The prepared composite lithium-rich cathode material can effectively solve the problem of lithium source shortage when used in lithium-ion supercapacitors. Background technique [0002] Lithium-ion batteries have been widely used in communication and digital fields, but the application in power has been slow. One of the main reasons is that the power density of lithium-ion batteries is low, which cannot meet the application requirements. In order to solve this problem, one of the effective methods is to combine lithium-ion batteries and supercapacitors to form lithium-ion supercapacitors by means of "internal integration". The so-called "internal integration" means that activated carbon is mixed in the positive electrode slurry preparation process Therefore, lithium-ion supercapacitors have two charging and...

Claims

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Application Information

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IPC IPC(8): H01G11/32H01G11/46H01G11/50H01G11/86
CPCY02E60/13H01G11/32H01G11/46H01G11/50H01G11/86
Inventor 米国民马世闯
Owner 安徽国研新能电芯技术有限公司
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