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Co3O4 nano lamellar material and preparation method and application thereof

A nanosheet-like, negative electrode material technology, applied in nanotechnology, electrical components, battery electrodes, etc., can solve the problems of low irreversible efficiency, poor cycle stability, and poor structural stability for the first time, and achieve good embedding/extraction electrochemical behavior, Effects of improved rate characteristics, good electrochemical stability and cycle life

Inactive Publication Date: 2012-04-11
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle agglomeration and poor structural stability of the material during the charging and discharging process lead to the disadvantages of the material, such as low initial irreversible efficiency and poor cycle stability.

Method used

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  • Co3O4 nano lamellar material and preparation method and application thereof
  • Co3O4 nano lamellar material and preparation method and application thereof
  • Co3O4 nano lamellar material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Get 3.63g cobalt nitrate (Co(NO 3 ) 2 6H 2 O, analytically pure, Sinopharm Chemical Reagent Company), 2.25g urea (H 2 NCONH 2 , analytically pure, Shanghai Jiuyi Chemical Reagent Co., Ltd.), 9.11g cetyltrimethylammonium bromide (CTAB, analytically pure, Shanghai Chemical Reagent Company) was added to 60ml deionized water, wherein Co(NO 3 ) 2 :CTAB:H 2 NCONH 2 : The molar ratio of water is 1:2:3:266.67, and the whole adding process is carried out under magnetic stirring (81-2 type, Shanghai Sile Instrument Co., Ltd.). After stirring for 40 minutes, move the entire mixed solution into a polytetrafluoroethylene-lined autoclave (100ml, Zhengxin Instrument Factory) with a filling degree of 60%, react at a certain temperature (115°C) for 17.5 hours, and then cool naturally , get the reaction liquid;

[0052] Centrifuge the above reaction solution, control the centrifugation speed to 3300r / min, and the time is 20min. The obtained centrifuged solids are washed 3 times...

Embodiment 2

[0056] Take 3.63 g cobalt nitrate (Co(NO 3 ) 2 6H 2 O, analytically pure, Sinopharm Chemical Reagent Company), 2.25 g urea (H 2 NCONH 2 , analytically pure, Shanghai Jiuyi Chemical Reagent Co., Ltd.), 9.11 g cetyltrimethylammonium bromide (CTAB, analytically pure, Shanghai Chemical Reagent Company) was added to 75 ml deionized water, Co(NO 3 ) 2 : CTAB: H 2 NCONH 2 : The molar ratio of water is 1:2:3:333.33, and the whole adding process is carried out under magnetic stirring (81-2 type, Shanghai Sile Instrument Co., Ltd.). After stirring for 60 minutes, move the entire mixed solution into a polytetrafluoroethylene-lined autoclave (100ml, Zhengxin Instrument Factory) with a filling degree of 75%, react at a certain temperature (120°C) for 18 hours, and then cool naturally. get the reaction solution.

[0057] Centrifuge the above reaction solution, control the centrifugation speed to be 3500r / min, and the time is 30min, and the obtained centrifuged solids are washed 3 ...

Embodiment 3

[0061] Take 3.63 g cobalt nitrate (Co(NO 3 ) 2 6H 2 O, analytically pure, Sinopharm Chemical Reagent Company), 2.25 g urea (H 2 NCONH 2 , analytically pure, Shanghai Jiuyi Chemical Reagent Co., Ltd.), 9.11 g cetyltrimethylammonium bromide (CTAB, analytically pure, Shanghai Chemical Reagent Company) was added to 70 ml deionized water, Co(NO 3 ) 2 : CTAB: H 2 NCONH 2 : The molar ratio of water is 1:2:3:311.12, and the whole adding process is carried out under magnetic stirring (81-2 type, Shanghai Sile Instrument Co., Ltd.). After stirring for 50 minutes, move the entire mixed solution into a polytetrafluoroethylene-lined autoclave (100ml, Zhengxin Instrument Factory) with a filling degree of 70%, react at a certain temperature (120°C) for 18 hours, and then cool naturally. get the reaction solution;

[0062] The above-mentioned reaction solution was centrifuged, and the centrifugation speed was controlled to be 3500r / min, and the time was 25min. The solid matter after...

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Abstract

The invention discloses a Co3O4 nano lamellar material and a preparation method and application thereof. The preparation method comprises the following steps of: mixing cobalt salt, a surfactant, a precipitator and deioned water in stoichiometric ratio; transferring the mixed solution into a reaction kettle and carrying out hydro-thermal reaction for 17.5-18.5 hours at 115-125 DEG C; and then washing and drying to obtain a powdery mixed precursor; and carrying out heat treatment on the powdery mixed precursor in air to finally obtain the Co3O4 nano lamellar material. The prepared Co3O4 material is of a regular nano lamellar structure, and can be applied to the negative electrode of a chargeable lithium ion battery so as to improve the storage capacity of lithium.

Description

technical field [0001] The invention relates to a Co 3 o 4 Nanosheet material and method for its preparation. technical background [0002] In the past ten years, lithium-ion batteries have been widely used in the field of mobile electronic terminal equipment due to their high performance advantages. co 3 o 4 Due to its high specific capacity and other advantages, it has received some attention [1]. The researchers on Co 3 o 4 The electrode material structure is nanometerized to improve its lithium storage performance, and a special structure is proposed to provide more specific surface area, provide a channel for lithium ions to be well deintercalated and an electrolyte / electrode contact surface, thereby promoting electrochemical reactions. [2]. [0003] Currently, Wan's group [3] has produced Co 3 o 4 Micro-nano structure, South Korea Sun group [4] prepared microspherical Co 3 o 4 Structural materials. According to the current research reports, the special str...

Claims

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Application Information

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IPC IPC(8): H01M4/525B82Y40/00
CPCY02E60/122Y02E60/10
Inventor 刘艳武英
Owner SHANGHAI INST OF TECH
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