Preparation method of lithium manganese silicate/carbon composite nanomaterial using metal sheet as substrate, positive electrode of lithium ion battery, lithium ion battery
A metal substrate, lithium manganese silicate technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problems of low electronic and ion conductivity, poor electrochemical performance, etc., to achieve large The effect of specific capacity, stable performance and stable structure
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Embodiment 1
[0049] 1) Put the cleaned tungsten sheet (thickness: 0.2mm) into 2.5ml polystyrene microsphere (PS opal) solution with a mass concentration of 0.05%, react at a constant temperature of 50°C for 36 hours, and then cure at a high temperature of 90°C for 2 hours , and the tungsten flakes with PSopal grown on the surface were obtained and collected.
[0050] 2) Li 2 MnSiO 4 Preparation of / C sol: Dissolve 1.3018g lithium acetate and 2.4509g manganese acetate in a mixed solution of 7.2g water and 7.2g acetic acid, stir for 1h, then add 1g glucose, stir until dissolved; 0.01mol ethyl orthosilicate Dissolved in 16ml of isopropanol, stirred for 1h, added dropwise to the above solution, and continued to stir for 20min to obtain Li 2 MnSiO 4 / C Sol.
[0051] Put the tungsten sheet grown with PS opal into the prepared Li 2 MnSiO 4 Immerse in / C sol for 1 second, then remove and dry at 15°C for 1 hour. into a tube furnace for calcination and reduction (H 2 / Ar mixed gas atmosphere...
Embodiment 2
[0057] 1) Place the cleaned nickel sheet in 3ml of polystyrene microsphere (PS opal) solution with a mass concentration of 0.08%, react at a constant temperature of 55°C for 20h, and then cure at a high temperature of 95°C for 1h to obtain a nickel sheet with PS opal growing on the surface ,collect.
[0058] 2) Li 2 MnSiO 4 The preparation method of / C sol is the same as in Example 1. Put the nickel sheet with grown PS opal into the prepared Li 2 MnSiO 4 Immerse in / C sol for 2 seconds, then remove and dry at 25°C for 20 minutes. Put in a tube furnace with 5% H 2 / Ar mixed gas calcination, the heating rate was raised to 750°C for 6 hours at a rate of 5°C / min, and Li was grown on the surface 2 MnSiO 4 / C Nickel sheet with inverse opal structure, collected.
[0059] 3) SiO 2 The preparation method of sol sol is the same as embodiment 1. There will be Li 2 MnSiO 4 / C inverse opal structure of nickel into 50ml SiO 2 Stir in the sol for 1.5 hours to obtain SiO grown on...
Embodiment 3
[0063] 1) Place the cleaned tungsten sheet in 3.5ml of polystyrene microsphere (PS opal) solution with a mass concentration of 0.09%, react at a constant temperature of 65°C for 12h, and then cure at a high temperature of 95°C for 1.5h to obtain PS opal grown on the surface Tungsten flakes, collected.
[0064] 2) Li 2 MnSiO 4 The preparation method of / C sol is the same as in Example 1. Put the tungsten sheet with grown PS opal into the prepared Li 2 MnSiO 4 Immerse in / C sol for 4 seconds, then remove and dry at 20°C for 30 minutes. Put in a tube furnace with 5% H 2 / Ar mixed gas calcination, the heating rate was raised to 650°C for 8 hours at a rate of 3°C / min, and Li was grown on the surface 2 MnSiO 4 / C Tungsten flakes of inverse opal structure, collected.
[0065] 3) SiO 2 The preparation method of sol sol is the same as embodiment 1. There will be Li 2 MnSiO 4 / C Tungsten flake with inverse opal structure placed in 60ml SiO 2 Stir in the sol for 1.5 hours to...
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