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Preparation method of high-capacity nitrogen-doped carbon-coated SnOx quantum dot lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve the problems of active material falling off and affecting the electrochemical performance of materials, and achieve mild experimental conditions, The effect of simple operation process

Active Publication Date: 2021-01-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of nitrogen-doped battery with high capacity to solve the problems that the current tin-based active materials will have huge volume expansion during charging and discharging, which will cause the active material to fall off, and then affect the electrochemical performance of the material. Carbon-coated SnO x Preparation method of quantum dot lithium ion battery negative electrode material

Method used

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  • Preparation method of high-capacity nitrogen-doped carbon-coated SnOx quantum dot lithium ion battery negative electrode material
  • Preparation method of high-capacity nitrogen-doped carbon-coated SnOx quantum dot lithium ion battery negative electrode material
  • Preparation method of high-capacity nitrogen-doped carbon-coated SnOx quantum dot lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 1mmol of crystalline tin tetrachloride and 8mmol of sodium hydroxide into 50mL of distilled water, stir until the reactants dissolve to form a clear and transparent solution, and control the temperature of the clear and transparent solution at about 10°C. 1 mmol of zinc sulfate heptahydrate was added to the above clarified solution, stirred for 5 hours to obtain a white suspension; after the reaction, centrifuged to obtain a white solid powder, which was washed with distilled water. The obtained product was dried overnight in a 50° C. forced-air drying oven to obtain a zinc stannate precursor.

[0041] Transfer all the products obtained in the previous step to polydiene dimethyl ammonium chloride aqueous solution, stir for 10-60 minutes, centrifuge to recover the powder after stirring and wash with deionized water; transfer the washed product directly to polystyrene In the aqueous solution of sodium sulfonate, stir for 10-60min, after stirring, centrifuge to recover...

Embodiment 2

[0052] The steps are the same as in Example 1, except that the molar ratio of the precursor and zinc nitrate is changed to 1:4, and other conditions remain unchanged, and finally carbon-coated SnO x Quantum dot composite (SC-4-800). Figure 7 It is the cycle performance diagram of SC-4-800 composite material. The discharge and charge specific capacities of the composite in the first cycle are 2948 and 1711 mAh g, respectively -1 , the reversible specific capacity reached 1824mAh g after 100 cycles -1 , the Coulombic efficiency is close to 100%.

Embodiment 3

[0054] The steps are the same as in Example 1, only the molar ratio of the precursor and zinc nitrate is changed to 1:6, and other conditions remain unchanged, and finally carbon-coated SnO x Cycle performance graph of quantum dot composite (SC-6-800). Figure 8 It is the cycle performance diagram of SC-6-800 composite material. The discharge and charge specific capacities of the composite in the first cycle are 2133 and 1480 mAh g, respectively -1 .

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Abstract

The invention relates to a preparation method of a high-capacity nitrogen-doped carbon-coated SnOx quantum dot lithium ion battery negative electrode material. The method comprises the following steps: (1) preparing a zinc stannate precursor; (2) preparing a zinc stannate precursor modified by polydiene dimethyl ammonium chloride and poly (sodium p-styrenesulfonate); (3) transferring the modifiedzinc stannate precursor into a container, then adding methanol, then sequentially adding zinc nitrate and 2-methylimidazole, and stirring for reaction to obtain solid powder; and (4) carrying out heattreatment at 600-1000 DEG C for 1-5 hours to obtain the high-capacity nitrogen-doped carbon-coated SnOx quantum dot lithium ion battery negative electrode material. The reversible specific capacity of the obtained composite material reaches 1824 mAh g <-1 > after 100 cycles under the current density of 0.2 A g <-1 >, and is far higher than the theoretical specific capacity of SnO2.

Description

technical field [0001] The invention belongs to the field of energy storage materials, and specifically develops a high-capacity nitrogen-doped carbon-coated SnO x (x=0, 1 and 2) Preparation method of quantum dot lithium ion battery negative electrode material. The present invention uses polydiene dimethyl ammonium chloride solution and polysodium p-styrene sulfonate to modify the binary oxide precursor zinc stannate, and induces the growth of ZIF-8 on the surface of the precursor through electrostatic adsorption, thereby achieving Uniform and controllable coating of zinc stannate. After high temperature pyrolysis, the precursor is cracked into SnO x The quantum dots are evenly distributed in the nano-carbon network. The material has an ultrahigh reversible specific capacity after cycling at low current density. This carbon-coated SnO x The new preparation method of quantum dot anode material has laid the foundation for the application of high specific energy tin anode. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48H01M4/131H01M4/1391H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/131H01M4/1391H01M4/483H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 程菲张亚楠叶幼文
Owner HEBEI UNIV OF TECH
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