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Graphene and ferroferric oxide dual-coated nanometer silicon composite material, preparation method thereof and application thereof in lithium ion batteries

A technology of ferroferric oxide and composite materials, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of reduction of electronic contact points and capacity, inability to form stable SEI film, and low coulombic efficiency and capacity issues, to achieve good cycle performance, improve electrochemical stability, and high capacity

Active Publication Date: 2018-01-19
GUANGDONG ORIENT RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the electrochemical alloying reaction of lithium and silicon leads to the volume expansion of silicon up to 300% during the lithium intercalation process, and the pressure generated by the huge volume shrinkage during the delithiation process will lead to the crushing and pulverization of the silicon material, and eventually It causes the reduction of electronic contact points and the attenuation of capacity; repeated volume expansion and contraction will also lead to the inability to form a stable SEI film on the surface of silicon materials, resulting in low Coulombic efficiency and capacity attenuation

Method used

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  • Graphene and ferroferric oxide dual-coated nanometer silicon composite material, preparation method thereof and application thereof in lithium ion batteries
  • Graphene and ferroferric oxide dual-coated nanometer silicon composite material, preparation method thereof and application thereof in lithium ion batteries
  • Graphene and ferroferric oxide dual-coated nanometer silicon composite material, preparation method thereof and application thereof in lithium ion batteries

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Graphite treatment: Weigh 12.5g of expandable graphite, 50g of potassium ferrate, and 625g of zirconium balls (grinding medium), add them to the ball mill jar, add a sealing ring, ball mill at 400rpm for 48h, pour the obtained sample into water, Then, excess dilute nitric acid (4.8 mol / L) was added for washing, filtered, and dried at 60° C. for 12 hours to obtain graphene nanosheets.

[0037] 2. Preparation of nano-silicon composite material coated with graphene and ferroferric oxide: Weigh 1g of silicon powder, 18g of graphene nanosheets, 1g of potassium ferrate, and 100g of zircon (grinding medium) in turn, add to the ball mill jar, add The upper sealing ring was ball milled at 1000rpm for 5h, and the obtained sample was filtered through a sieve to remove zirconium balls, then filtered, washed, and dried at 60°C for 12h to obtain a nano-silicon composite material double-coated with graphene and ferric oxide.

[0038] Take by weighing 0.2g of the graphene and iron f...

Embodiment 2

[0040]1. Graphite treatment: Weigh 12.5g of expandable graphite, 50g of potassium ferrate, and 625g of zirconium balls (grinding medium), add them to the ball mill jar, add a sealing ring, ball mill at 400rpm for 48h, pour the obtained sample into water, Then, excess dilute nitric acid (4.8 mol / L) was added for washing, filtered, and dried at 60° C. for 12 hours to obtain graphene nanosheets.

[0041] 2. Preparation of nano-silicon composite material coated with graphene and ferroferric oxide: Weigh 1g of silicon powder, 6g of graphene nanosheets, 13g of potassium ferrate, and 200g of zircon (grinding medium) in turn, add to the ball mill jar, add The upper sealing ring was ball milled at 800rpm for 10h, and the obtained sample was filtered through a sieve to remove zirconium balls, then filtered, washed, and dried at 60°C for 12h to obtain a nano-silicon composite material double-coated with graphene and ferroferric oxide.

[0042] Take by weighing 0.2g of the graphene and ir...

Embodiment 3

[0044] 1. Graphite treatment: Weigh 12.5g of expandable graphite, 50g of potassium ferrate, and 625g of zirconium balls (grinding medium), add them to the ball mill jar, add a sealing ring, ball mill at 400rpm for 48h, pour the obtained sample into water, Then, excess dilute nitric acid (4.8 mol / L) was added for washing, filtered, and dried at 60° C. for 12 hours to obtain graphene nanosheets.

[0045] 3. Preparation of nano-silicon composite material coated with graphene and ferroferric oxide: Weigh 2g of silicon powder, 14g of graphene nanosheets, 4g of potassium ferrate, and 300g of zircon (grinding medium) in turn, add to the ball mill jar, add The upper sealing ring was ball milled at 600rpm for 20h, and the obtained sample was filtered through a sieve to remove zirconium balls, then filtered, washed, and dried at 60°C for 12h to obtain a nano-silicon composite material double-coated with graphene and ferric oxide.

[0046] Take by weighing 0.2g of the graphene and iron f...

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PUM

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Abstract

The invention discloses a graphene and ferroferric oxide dual-coated nanometer silicon composite material, a preparation method thereof and application thereof in lithium ion batteries, and belongs tothe technical field of lithium ion battery materials. The preparation method comprises the following steps: firstly carrying out mixing and ball-milling treatment on expansible graphite and a strongoxidant, then carrying out ball-milling on the treated expansible graphite, potassium ferrate and silica powder, and finally filtering, washing and drying to obtain the graphene and ferroferric oxidedual-coated nanometer silicon composite material. The material obtained in the invention can be used for cathodes of lithium ion batteries, and has relatively high specific capacity, preferable long-period cycle performance and excellent rate capability.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a nano-silicon composite material double-coated with graphene and ferric oxide, a preparation method thereof, and an application in lithium-ion batteries. Background technique [0002] At present, due to the increasingly prominent energy problems and environmental problems, people urgently need a promising new energy source. At the same time, lithium-ion batteries have the advantages of high voltage, high energy density, high safety, low self-discharge rate, etc., and have received great attention from people. In electric vehicles, solar energy storage batteries, energy storage power stations, smart phones, laptop computers and other application fields, lithium-ion batteries are required to have high capacity, high rate, high stability, high safety and high consistency, so Designing and synthesizing anode materials with high reversible capacity, excellent...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/52H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 吴松平刘淳田小东黄明保廖婵孙水晶
Owner GUANGDONG ORIENT RESIN
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