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Preparation method and application of C/SnO2/rGO composite negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems that cannot meet the requirements of high capacity and good cycle stability of negative electrode materials, and achieve good cycle stability, good Rate capability, strain relief effect

Inactive Publication Date: 2021-03-30
NANJING GUOXUAN BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] One of the important parts that affect the performance of lithium-ion batteries is the negative electrode material. Although the graphite negative electrode material has been developed so far, it has a mature preparation process and relatively low price and cost, but this still cannot meet the current requirements for high capacity and cycle life of lithium battery negative electrode materials. Good stability requirements, therefore, researchers still carry out a lot of exploration work

Method used

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  • Preparation method and application of C/SnO2/rGO composite negative electrode material of lithium ion battery
  • Preparation method and application of C/SnO2/rGO composite negative electrode material of lithium ion battery
  • Preparation method and application of C/SnO2/rGO composite negative electrode material of lithium ion battery

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Embodiment 1

[0029] A lithium-ion battery C / SnO 2 The preparation method of / rGO composite negative electrode material comprises the following steps:

[0030] S1, 0.9mmol SnCl 4 ·5H 2 O (0.3155g) was dissolved in 30ml of ethylene glycol, and magnetically stirred for 30min to obtain solution A; GO solution (30ml, 0.833mg / ml) was ultrasonically dispersed for 30min, then 0.9mmol of sodium gluconate was added, and magnetically stirred for 30min to obtain solution B;

[0031] S2, the solution A is quickly dropped into the solution B under stirring, and the stirring is continued for 60 minutes to obtain a black mixed solution;

[0032] S3. Transfer the above-mentioned black mixed solution to a 100ml stainless steel reaction kettle lined with polytetrafluoroethylene, place it in a forced air drying oven, keep it warm at 180°C for 6h, and then cool it naturally to room temperature to obtain a black suspension;

[0033] S4. Centrifuge the black suspension at 9000rpm for 10min, remove the superna...

Embodiment 2

[0036] A lithium-ion battery C / SnO 2 The preparation method of the / rGO composite negative electrode material, compared with Example 1, the only difference is that the amount of sodium gluconate in S1 is 1.8mmol; the resulting composite material is denoted as C / SnO 2 / rGO-2.

Embodiment 3

[0038] A lithium-ion battery C / SnO 2 The preparation method of the / rGO composite negative electrode material, compared with Example 1, the only difference is that the amount of sodium gluconate in S1 is 2.7mmol; the resulting composite material is denoted as C / SnO 2 / rGO-3.

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Abstract

The invention discloses a preparation method and application of a C / SnO2 / rGO composite negative electrode material of a lithium ion battery, and relates to the technical field of lithium ion batteries. The preparation method comprises the following steps of dissolving stannic chloride pentahydrate in ethylene glycol, stirring and dispersing to obtain a solution A; adding sodium gluconate into thegraphene oxide dispersion liquid, and stirring and dispersing to obtain a solution B; dropwise adding the solution A into the solution B while stirring, and stirring to obtain a black mixed solution;transferring the black mixed solution into a reaction kettle, heating to react, and cooling to obtain a black suspension; centrifuging, washing and centrifuging the black suspension to obtain a precipitate; and dissolving the precipitate in absolute ethyl alcohol, ultrasonically dispersing, drying and grinding to obtain the C / SnO2 / rGO composite negative electrode material. According to the presentinvention, SnO2 nanoparticles grow on the surface of rGO in situ by utilizing a solvothermal method, and the surfaces of the SnO2 nanoparticles are coated with a layer of amorphous carbon, so that the obtained composite material effectively inhibits volume expansion of SnO2, shortens a lithium ion diffusion path, and has good cycling stability and higher reversible capacity performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery C / SnO 2 Preparation method and application of rGO composite anode material. Background technique [0002] With the development of social economy and the improvement of productivity, the global demand for energy continues to increase, and the main sources are still the traditional three major non-renewable energy sources (natural gas, coal, oil). Due to the extensive and low-efficiency utilization in the early stage, without a reasonable plan, a large amount of fossil energy was consumed, and a series of severe environmental problems followed, such as acid rain, global warming, smog and so on. It is imminent to develop new types of efficient and clean energy, which is related to the living environment of human society and the sustainable development in the future. Therefore, there are currently a lot of research focusing on clean energy, and th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M4/62H01M10/0525
CPCH01M4/485H01M4/587H01M4/364H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 周志浩姚汪兵
Owner NANJING GUOXUAN BATTERY CO LTD
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