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Metal oxide-sulfide composite negative electrode material and preparation method thereof

A negative electrode material and oxide technology, which is applied in the field of preparation of new metal oxides/sulfides, can solve problems affecting the electrochemical performance and volume expansion of lithium-ion batteries, and achieve green and environmentally friendly reaction conditions, reduce production costs, and wide application foreground effect

Inactive Publication Date: 2018-01-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, Cu as an electrode material 2 O is not stable, and its volume will expand, thereby affecting the electrochemical performance of lithium-ion batteries

Method used

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  • Metal oxide-sulfide composite negative electrode material and preparation method thereof
  • Metal oxide-sulfide composite negative electrode material and preparation method thereof
  • Metal oxide-sulfide composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1, add 350 μl of 0.1M CuSO 4 .5H 2 O aqueous solution and 350 μL of 1.0M NaOH aqueous solution were mixed in a water bath at a certain temperature, and stirred for 3-5 minutes, then AA (ascorbic acid) aqueous solution was added thereto, and stirred for 10 minutes in a water bath at a certain temperature to make crystals grow. Afterwards, several times of centrifugation and washing with deionized water and absolute ethanol can obtain 2 O nanoparticles, spare.

[0032] Step 2, the MoS 2 Add the powder (finished product) into NMP and shake continuously to make MoS 2 Uniform powder

[0033] Dispersed in NMP, the concentration of the dispersion is 1mg L -1 , sonicated for 1h on stacked MoS 2 Perform stripping. Centrifuge the stripped dispersion at 3000rpm, absorb the supernatant (about 1 / 2 of the total dispersion), and then centrifuge the obtained supernatant at 14000rpm to remove NMP to obtain MoS 2 Flakes.

[0034] Step 3, the Cu obtained in step 1 and step 2...

Embodiment 2

[0042] Step 1, the CuSO 4 When dissolved in deionized water and mixed with 1.0M NaOH solution, the amount of NaOH solution is 425 μL, and other conditions are the same as step (1) in Example 1.

[0043] Step 2, the MoS 2 Add the powder (finished product) into NMP and shake continuously to make MoS 2 The powder is evenly dispersed in NMP, the concentration of the dispersion is 1mg L -1 , when processing the dispersion, the ultrasonic time was 2h, and other conditions were the same as step 2 in Example 1.

[0044] Step 3 is the same as Step 3 in Example 1.

[0045] The electrochemical test steps are the same as in Example 1.

[0046] The first cycle discharge specific capacity of the material obtained in this example is 687.4mAh g -1 , the specific capacity of the first cycle charging is 476.3mAh g -1 , after 60 charge-discharge cycles, the capacity retention rate is about 94.5%.

Embodiment 3

[0048] Step 1, the CuSO 4 When dissolved in deionized water and mixed with 1.0M NaOH solution, the volume of NaOH solution is 550 μL, and other conditions are the same as step 1 in Example 1.

[0049] Step 2, the conditions are the same as Step 2 in Example 1.

[0050] Step 3, the conditions are the same as Step 3 in Example 1.

[0051] The electrochemical test steps are the same as in Example 1.

[0052] The first cycle discharge specific capacity of the material obtained in this example is 534.4mAh g -1 , the specific capacity of the first cycle charge is 457.6mAh g -1 , after 100 charge-discharge cycles, the capacity retention rate is about 89.5%.

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Abstract

The invention discloses a metal oxide-sulfide composite negative electrode material and a preparation method thereof. Cu2O nanoparticles are uniformly loaded on the surface of a relatively thin MoS2 nanosheet. According to the novel metal oxide-sulfide composite negative electrode material, the Cu2O nanoparticles are relatively uniform in size and regular in shape and form, and can be uniformly loaded on the MoS2 nanosheet through van der waals force. The composite material is used as an active substance of a negative electrode material for a lithium-ion battery, the electrochemical properties(current density: 200mA g<-1> and voltage: 0.01-3V) are tested, and the result shows that the specific capacity and the cycling stability of the composite material are far better than those of a Cu2Omonomer and the capacity retention ratio of the material is extremely high. The preparation method is green, environment-friendly, mild in condition, relatively short in reaction time, easy to operate and suitable for industrial production, and has a broad application prospect.

Description

technical field [0001] The invention belongs to the application field of negative electrode materials of lithium ion batteries, in particular to a preparation method and application of a novel metal oxide / sulfide. Background technique [0002] As an ideal lithium-ion battery anode material, MoS 2 It has a graphene-like layered structure, and the larger interlayer distance (0.62nm) is conducive to the intercalation and extraction of lithium ions, and has a higher theoretical specific capacity. But due to MoS 2 With large surface energy, layered MoS 2 It is easy to stack, so in the process of charge and discharge cycle, the volume is easy to change, and the capacity decays quickly. In addition, MoS 2 The intrinsic electronic conductivity is poor, which affects its electrochemical performance. [0003] Transition metal oxide Cu 2 O, because of its low production cost, non-toxicity, high theoretical specific capacity and other advantages, it is used instead of carbon-based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 娄永兵刘甲文
Owner SOUTHEAST UNIV
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