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Preparation method of SnO2/graphene/PPy ternary composite material

A composite material and graphene technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor cycle performance and rate performance, complicated preparation methods, low efficiency, etc., achieve high capacity and simple synthesis process , Improve the effect of transmission efficiency

Inactive Publication Date: 2019-05-10
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Purpose of the invention: In view of the problems of poor cycle performance and rate performance, complicated preparation method, low efficiency and high cost of existing lithium-ion battery negative electrode materials, the present invention discloses a SnO 2 Preparation method of / graphene / PPy ternary composite material

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  • Preparation method of SnO2/graphene/PPy ternary composite material
  • Preparation method of SnO2/graphene/PPy ternary composite material
  • Preparation method of SnO2/graphene/PPy ternary composite material

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Embodiment 1

[0018] In the first step, the graphene material is synthesized by a redox method. In a 250mL three-neck flask equipped with a mechanical stirrer, add 150mL of concentrated sulfuric acid, and cool down to 0°C in an ice bath. To the above concentrated sulfuric acid, add 6.5g of graphite powder. Under stirring, in the three-necked flask, add 19.5g KMnO in batches 4 , the reaction temperature does not exceed 20°C. KMnO 4 After the addition was complete, stirring was continued for 40 min under an ice bath. Then, the reaction was continued at 35° C. for 2 h, and the above reaction solution was poured into 460 mL of distilled water, and stirred at 60° C. for 1 h. Then, the reaction solution was poured into a mixed solution of 1.4 L of water and 100 mL of hydrogen peroxide, and stirred for 24 h. Filter, wash three times with 5% hydrochloric acid solution, and dry at 70°C for 72 hours to obtain graphite oxide. Graphene is obtained by sintering graphite oxide at 800°C for 60s;

...

Embodiment 2

[0022] The 1st step, the step of synthesizing graphene material with redox method is identical with the 1st step in embodiment 1;

[0023] Step 2: Synthesis of hollow SnO by hydrothermal method 2 Material. Prepare 15mmol·L -1 Na 2 SnO 3 ·3H 2 O deionized water / dehydrated ethanol solution (volume ratio 5:3), add urea to make its concentration reach 0.1mol L -1 , the solution was transferred to a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, heated in an electric thermostatic drying oven at 160°C for 30 hours, and cooled naturally. °C drying, and then heat treatment at 500 °C in a tube furnace for 1 h, the obtained SnO 2 hollow microspheres;

[0024] Step 3: Synthesis of novel SnO by in situ polymerization 2 / graphene / PPy ternary composites. 0.1g hollow SnO 2 The microspheres were mixed into 40 mL deionized aqueous solution containing 4 mg sodium lauryl sulfate and 0.025 g graphene, sonicated for 30 min, and then magnetically stirred for 3 h. Afte...

Embodiment 3

[0026] The 1st step, the step of synthesizing graphene material with redox method is identical with the 1st step in embodiment 1;

[0027] Step 2: Synthesis of hollow SnO by hydrothermal method 2Material. Prepare 10mmol·L -1 Na 2 SnO 3 ·3H 2 O deionized water / dehydrated ethanol solution (volume ratio 5:3), add urea to make its concentration 0.1mol L -1 , the solution was transferred to a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, heated in an electric thermostatic drying oven at 200°C for 24 hours, and cooled naturally. °C drying, and then heat treatment at 500 °C in a tube furnace for 1 h, the obtained SnO 2 hollow microspheres;

[0028] Step 3: Synthesis of novel SnO by in situ polymerization 2 / graphene / PPy ternary composites. 0.1g hollow SnO 2 The microspheres were mixed into 40 mL deionized aqueous solution containing 4 mg sodium dodecylsulfonate and 0.01 g graphene, sonicated for 30 min, and then magnetically stirred for 3 h. Afterwards...

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Abstract

The invention discloses a preparation method of an SnO2 / graphene / PPy ternary composite material. The composite material is prepared by wrapping the surfaces of hollow SnO2 particles with PPy and graphene at the same time through a hydrothermal-in-situ polymerization method; by utilizing the synergistic effect of hollow SnO2 and PPy layers on the buffer volume change, the two-dimensional graphene is introduced, so that the strength of an electrode is enhanced, and meanwhile, the migration rate of electrons and lithium ions in the electrode is effectively improved; excellent cycling stability and rate performance are presented; the SnO2 / graphene / PPy ternary composite material has the advantages that the structure is novel, the preparation is simple, and the raw materials are cheap and easilyavailable; and therefore, the composite material has huge industrial application values.

Description

technical field [0001] The invention discloses a SnO 2 The invention discloses a method for preparing a graphene / PPy ternary composite material, which belongs to the technical field of negative electrode materials for lithium ion batteries. Background technique [0002] SnO 2 The material has a high theoretical specific capacity (782mAh g -1 ), much higher than the theoretical specific capacity of commercialized graphite electrodes (372mAh g -1 ), and due to its low cost, high safety and non-toxicity, it is considered to be the most potential anode material for the next generation of lithium-ion batteries, but the material is in the charge and discharge process of SnO 2 The particle will undergo a huge volume change, which will lead to a rapid capacity decay, which greatly limits its application range. In order to solve the above problems, improve the SnO 2 The cycle stability of the negative electrode material shortens the diffusion path of lithium, reduces the interna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCY02E60/10
Inventor 刘瑞卿马延文林秀婧刘志伟卜雅丽
Owner NANJING UNIV OF POSTS & TELECOMM
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