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Rattle-like Fe3O4/C/MoS2 hybrid micro-particles for negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of low specific capacity, volume expansion, low conductivity, etc., and achieve the effect of improving cycle stability

Active Publication Date: 2019-09-13
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this literature neither applies the material to the field of lithium-ion batteries nor achieves effective regulation of its rattle-like structure
Literature [Adv. Mater. 2017, 29, 1603020] by designing three-dimensional MoS 2 / C composite structure is used to improve the performance of Li-ion batteries, effectively solving the problem of MoS 2 However, the energy storage mechanism of this material is only intercalation-deintercalation, and its specific capacity is still low.
The invention patents with domestic application numbers 201610151315.5 and 201610150933.8 provide a preparation method of lithium ion battery negative electrode material and a preparation method of composite microsphere lithium ion battery negative electrode material with egg yolk structure. The principle is to construct egg yolk structure Fe 3 o 4 / C-N composite structure to solve the Fe 3 o 4 Problems such as low conductivity and volume expansion
However, it still fails to effectively convert Fe 3 o 4 , carbon and MoS 2 The effective composition and structure design of the three materials has caused problems such as simple lithium storage mechanism, low specific capacity, and difficulty in effectively adjusting the specific capacity and cycle stability.

Method used

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  • Rattle-like Fe3O4/C/MoS2 hybrid micro-particles for negative electrode material of lithium ion battery
  • Rattle-like Fe3O4/C/MoS2 hybrid micro-particles for negative electrode material of lithium ion battery
  • Rattle-like Fe3O4/C/MoS2 hybrid micro-particles for negative electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Submicron cubic α-Fe 2 o 3 Preparation: 27.3 g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) Dissolved in 50 ml of deionized water to prepare a 2 mol / L solution, stirred vigorously at a constant temperature of 75 °C for 30 min, then added 10.8 g of sodium hydroxide (NaOH) and 50 ml of deionized water dropwise to prepare solution, continue to stir for 10 min, transfer the mixed solution to the reaction kettle, and ripen at 110 °C for 48 h, then take out the sample and centrifuge to precipitate, dry the precipitate at 60 °C for 12 h, and grind to obtain a side length of 550 nm Brick red submicron cubic α-Fe 2 o 3 .

[0035] 2) Core-shell α-Fe 2 o 3 / Preparation of polydopamine (PDA) composite particles: weigh 0.32 g of submicron cubic α-Fe prepared in step 1) 2 o 3 Place in a 500 mL flask, add 300 mL of deionized water and 100 mL of absolute ethanol, after ultrasonic dispersion for 40 min, add 0.25 g of DA and 0.15 g of TRIS, stir for 12 h, then use deionized ...

Embodiment 2

[0041] 1) Submicron cubic α-Fe 2 o 3 The preparation: carry out according to embodiment 1.

[0042] 2) Core-shell α-Fe 2 o 3 / Preparation of polydopamine (PDA) composite particles: weigh 0.32 g of submicron cubic α-Fe prepared in step 1) 2 o 3 Place in a 500 mL flask, add 300 mL of deionized water and 100 mL of absolute ethanol, after ultrasonic dispersion for 40 min, add 0.5 g of DA and 0.3 g of TRIS, stir for 12 h, then use deionized water for three centrifugation washes , the resulting precipitate was dried at 60°C for 12 h to obtain the core-shell α-Fe 2 o 3 / PDA composite particles.

[0043] 3) Rattle-shaped α-Fe 2 o 3 Preparation of / PDA composite particle: Carry out according to embodiment 1.

[0044] 4) Rattle Fe 2 o 3 / PDA / MoS 2 Preparation of hybrid microparticles: according to Example 1.

[0045] 5) Rattle Fe 3 o 4 / C / MoS 2 Preparation of hybrid microparticles: according to Example 1.

Embodiment 3

[0047] 1) Submicron cubic α-Fe 2 o 3 The preparation: carry out according to embodiment 1.

[0048] 2) Core-shell α-Fe 2 o 3 / PDA composite particle preparation: according to Example 1.

[0049] 3) Rattle-shaped α-Fe 2 o 3 / PDA composite particle preparation: all the α-Fe prepared in step 2) 2 o 3 / PDA composite particles were placed in 80 mL of 4 mol / L hydrochloric acid solution, stirred at room temperature for 6 h, α-Fe 2 o 3 Partially etched to form rattle-shaped α-Fe 2 o 3 / PDA composite particles.

[0050] 4) Rattle Fe 2 o 3 / PDA / MoS 2 Preparation of hybrid microparticles: according to Example 1.

[0051] 5) Rattle Fe 3 o 4 / C / MoS 2 Preparation of hybrid microparticles: according to Example 1.

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Abstract

The invention belongs to the field of lithium ion battery negative electrode materials, and particularly relates to rattle-like Fe3O4 / C / MoS2 hybrid micro-particles for a negative electrode material ofa lithium ion battery. The rattle-like Fe3O4 / C / MoS2 hybrid micro-particles are prepared by taking submicron cubic alpha-Fe3O4 as a template, and carrying out polymerization of dopamine on the surfaces of template micro-particles, controllable etching of hydrochloric acid, hydrothermal treatment in the presence of sodium molybdate dihydrate and a high-temperature carbonization process in sequence.The micro-particles have the characteristics of large reversible capacity, excellent rate performance, excellent cycling stability and the like when being used as the negative electrode material of the lithium ion battery, and are an innovation in the aspect of lithium ion battery negative electrode materials.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, in particular to a rattle-shaped Fe used for lithium-ion battery negative electrode materials. 3 o 4 / C / MoS 2 hybrid particles. Background technique [0002] With the increasing consumption of fossil energy by human beings, on the one hand, it has led to a serious energy crisis, and at the same time, it has also caused huge environmental pollution. In order to solve this situation, it is very important to improve the utilization rate of clean energy such as wind energy, solar energy, and water energy. However, because these energy sources are greatly affected by seasons, regions, climate and environment, their supply fluctuates greatly, which limits their promotion and utilization. If these clean energies can be stored in rechargeable batteries during their oversupply phase and released when their supply is insufficient, the above-mentioned problems can be effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/523H01M4/5815H01M4/625H01M4/62H01M10/0525B82Y30/00Y02E60/10
Inventor 陈志民张申申于良杨崇方明明陈永
Owner ZHENGZHOU UNIV