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Sulfonated graphene and lithium nickel manganese oxide composite material and preparation method and application thereof

A technology of sulfonated graphene and lithium nickel manganese oxide, which is applied in the field of sulfonated graphene/lithium nickel manganese oxide composite materials and its preparation, can solve the problems of poor material structure stability, poor cycle stability, and low specific capacity

Inactive Publication Date: 2017-07-11
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the defects of the existing graphene-coated lithium nickel manganese oxide composite material with low specific capacity, poor cycle stability, poor rate characteristics, or poor material structure stability, and provide a sulfonate Graphene / lithium nickel manganese oxide composite material and its preparation method and application

Method used

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  • Sulfonated graphene and lithium nickel manganese oxide composite material and preparation method and application thereof
  • Sulfonated graphene and lithium nickel manganese oxide composite material and preparation method and application thereof
  • Sulfonated graphene and lithium nickel manganese oxide composite material and preparation method and application thereof

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Embodiment 1

[0072] A kind of sulfonated graphene / lithium nickel manganese oxide composite material, the mass ratio of nickel manganese oxide lithium and sulfonated graphene in the composite material is 20:1, wherein, sulfonated graphene is coated on the lithium nickel manganese oxide surface, nickel The molecular formula of lithium manganate is LiNi 0.5 mn 1.5 o 4 , the process flow of its preparation is attached figure 1 As shown, the specific steps are as follows:

[0073] (1) 1.5mmol of Mn(CH 3 COO) 2 4H 2 O, 0.5mmol of Ni(CH 3 COO) 2 4H 2 O was dissolved in 10 mL of deionized water, and then 2 mmol of citric acid was dissolved in 10 mL of deionized water. Under high-speed magnetic stirring, pour the citric acid solution into the manganese acetate and nickel acetate solutions to obtain a green solution. Adjust the pH value to 7.0-8.0 with ammonia water. After stirring for 30 minutes, heat the solution to 80°C and keep the stirring speed at 400r / min until green wet gel is form...

Embodiment 2

[0081] A kind of sulfonated graphene / lithium nickel manganese oxide composite material, the mass ratio of nickel manganese oxide lithium and sulfonated graphene in the composite material is 30:1, wherein, sulfonated graphene is coated on the lithium nickel manganese oxide surface, nickel The molecular formula of lithium manganate is LiNi 0.5 mn 1.5 o 4 , the specific preparation steps are as follows:

[0082] (1) 1.5mmol of Mn(NO 3 ) 2 , 0.5mmol of Ni(NO 3 ) 2 Dissolve in 10mL ionized water, then dissolve 2mmol citric acid in 10mL ionized water. Under high-speed magnetic stirring, pour the citric acid solution into the manganese nitrate and nickel nitrate solutions to obtain a green solution. Adjust the pH value to 7.0-8.0 with ammonia water. After stirring for 30 minutes, heat the solution to 75°C and keep the stirring speed at 300r / min until green wet gel is formed. The wet gel was transferred to a vacuum oven, dried at 110°C for 15 hours, and the obtained dry gel wa...

Embodiment 3

[0090] A kind of sulfonated graphene / lithium nickel manganese oxide composite material, the mass ratio of lithium nickel manganese oxide and sulfonated graphene is 10:1 in the composite material, wherein, sulfonated graphene is coated on the lithium nickel manganese oxide surface, nickel The molecular formula of lithium manganate is LiNi 0.5 mn 1.5 o 4 , the specific preparation steps are as follows:

[0091] (1) 1.5mmol of MnCl 2 , 0.5mmol of NiCl 2 Dissolve in 10mL ionized water, then dissolve 2mmol citric acid in 10mL ionized water. Under high-speed magnetic stirring, pour the citric acid solution into the manganese chloride and nickel chloride solutions to obtain a green solution. Adjust the pH value to 7.0-8.0 with ammonia water, and after stirring for 30 minutes, heat the solution to 85°C and maintain the stirring speed at 500r / min until the green wet gel is formed. The wet gel was transferred to a vacuum oven, dried at 100°C for 15 hours, and the obtained dry gel ...

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Abstract

The invention discloses a sulfonated graphene and lithium nickel manganese oxide composite material and a preparation method and application thereof. The mass ratio of lithium nickel manganese oxide to sulfonated graphene in the composite material is (10-30):1. Sulfonated graphene coats the surface of lithium nickel manganese oxide, which has the molecular formula of LiNi<x>Mn<2-x>O4, wherein 0.3<x<0.7. The preparation method comprises the following steps: (1) preparing a nickel manganese oxide precursor through a sol-gel method; (2) mixing the nickel manganese oxide precursor with a soluble lithium source substance and performing calcination in an oxygen-containing atmosphere to obtain lithium nickel manganese oxide; and (3) mixing lithium nickel manganese oxide with a sulfonated graphene aqueous solution and performing drying. The prepared lithium nickel manganese oxide is excellent in crystallinity and integrated in crystal structure. Through surface modification of sulfonated graphene, a uniform coating effect is achieved, and the poor electronic conductivity of lithium nickel manganese oxide is overcome, so that the electrochemical performance of the composite material is improved.

Description

technical field [0001] The invention relates to the field of lithium battery electrode materials, in particular to a sulfonated graphene / lithium nickel manganese oxide composite material and its preparation method and application. Background technique [0002] Lithium nickel manganese oxide material is currently being developed as a positive electrode material for lithium-ion batteries with attractive prospects. Compared with lithium cobalt oxide material, lithium nickel manganese oxide material has high output voltage, low cost and environmental friendliness; compared with lithium manganese oxide material, its high-temperature cycle stability is better; compared with lithium iron phosphate material, its preparation The process is simple, and the batch stability of production is good. However, the surface structure of lithium nickel manganese oxide is unstable, and a chemical reaction will occur on the surface of lithium nickel manganese oxide in contact with the electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 周兰刘佳丽李旺孙华
Owner SHANGHAI ELECTRICGROUP CORP
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