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A rattle-shaped fe for negative electrode material of lithium ion battery 3 o 4 /c/mos 2 Hybrid particles

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of low specific capacity, volume expansion, poor mechanical stability, etc., to improve cycle stability and stabilize MoS2 Layer, the effect of enhancing the electrochemical performance

Active Publication Date: 2022-05-24
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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  • A rattle-shaped fe for negative electrode material of lithium ion battery <sub>3</sub> o <sub>4</sub> /c/mos <sub>2</sub> Hybrid particles
  • A rattle-shaped fe for negative electrode material of lithium ion battery <sub>3</sub> o <sub>4</sub> /c/mos <sub>2</sub> Hybrid particles
  • A rattle-shaped fe for negative electrode material of lithium ion battery <sub>3</sub> o <sub>4</sub> /c/mos <sub>2</sub> Hybrid particles

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) Submicron cubic α-Fe 2 O 3 Preparation of: 27.3 g of ferric chloride hexahydrate (FeCl 3 ·6H 2 O) was dissolved in 50 ml of deionized water to prepare a 2 mol / L solution. After vigorous stirring at a constant temperature of 75 °C for 30 min, a solution prepared by dropwise addition of 10.8 g of sodium hydroxide (NaOH) and 50 ml of deionized water was added. , after stirring for 10 min, the mixed solution was transferred to the reaction kettle, aged at 110 °C for 48 h, then the sample was centrifuged and precipitated, and the precipitate was dried at 60 °C for 12 h, and then ground to obtain a Brick red submicron cubic α-Fe 2 O 3 .

[0035] 2) Core-shell α-Fe 2 O 3 Preparation of / polydopamine (PDA) composite microparticles: Weigh 0.32 g of the submicron cubic α-Fe prepared in step 1) 2 O 3 Put it in a 500 mL flask, add 300 mL of deionized water and 100 mL of anhydrous ethanol, after ultrasonic dispersion for 40 min, add 0.25 g DA and 0.15 g TRIS, stir for 12...

Embodiment 2

[0041] 1) Submicron cubic α-Fe 2 O 3 Preparation: according to Example 1.

[0042] 2) Core-shell α-Fe 2 O 3 Preparation of / polydopamine (PDA) composite microparticles: Weigh 0.32 g of the submicron cubic α-Fe prepared in step 1) 2 O 3 Put it 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 DA and 0.3 g TRIS, stir for 12 h, and use deionized water for three centrifugal washings , the obtained precipitate was dried at 60 °C for 12 h to obtain core-shell α-Fe 2 O 3 / PDA composite particles.

[0043] 3) Rattle α-Fe 2 O 3 Preparation of / PDA composite particles: according to Example 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 Preparation: according to Example 1.

[0048] 2) Core-shell α-Fe 2 O 3 Preparation of / PDA composite particles: according to Example 1.

[0049] 3) Rattle α-Fe 2 O 3 Preparation of / PDA composite particles: 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-like 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, in particular to a rattle-shaped Fe used for lithium-ion battery negative electrode materials. 3 o 4 / C / MoS 2 hybrid particles. The hybrid particles are submicron-sized cubic α-Fe 2 o 3 As a template, the rattle-like Fe 3 o 4 / C / MoS 2 hybrid particles. When the particles are used as anode materials for lithium-ion batteries, they have the characteristics of large reversible capacity, excellent rate performance, and excellent cycle stability. They are innovations in anode materials for lithium-ion batteries.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and particularly relates to a rattle-shaped Fe for the negative electrode materials of lithium ion batteries. 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, water energy and so on. However, because these energy sources are greatly affected by seasons, regions, climates and environments, their supply fluctuates greatly, which limits the extent of their promotion and utilization. If these clean energy sources can be stored in rechargeable batteries during periods of excess supply and released when they are undersuppli...

Claims

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Application Information

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Patent Type & Authority Patents(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