A kind of graphene and ferroferric oxide double-coated nano-silicon composite material and its preparation method and application in lithium-ion batteries
A technology of triiron tetroxide and composite materials, applied in graphene and triiron tetroxide double-coated nano-silicon composite materials and their preparation, and application fields in lithium ion batteries, which can solve the problem of inability to form stable SEI films and electronic contacts. Point reduction and capacity, low coulombic efficiency and capacity, etc., to achieve the effect of good cycle performance, improved electrochemical stability, and high capacity
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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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