Anode material and manufacturing method thereof as well as lithium ion battery and negative plate thereof
A lithium-ion battery and negative electrode material technology, applied in the field of battery technology and new energy materials, can solve problems such as poor cycle performance, structural damage, capacity attenuation, etc., achieve high specific capacity, prevent secondary agglomeration, and reduce capacity loss Effect
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Embodiment 1
[0029] Example 1 (1) 10 g of graphite (selected from commercially available finished products, preferably with a particle size of less than 50 mesh and a tap density greater than 1.2g / cm 3) and 5 g of sodium nitrate into the flask, inserting non-carbonaceous sodium ions between the graphite layers to form graphite intercalation complexes, weakening the interlayer force, adding 800 ml while stirring in an ice-water bath Concentrated sulfuric acid, then slowly add 50 g of potassium permanganate, stir in an ice bath for 2 hours, then warm up to room temperature, and continue to stir for 24 hours; add 30 ml of 30% hydrogen peroxide to reduce the residual oxidant, stir for 2 hours, and then use the concentration Wash with 3% dilute sulfuric acid, filter with suction, and dry to obtain graphite oxide.
[0030] (2) Take 1 g of the prepared graphite oxide and disperse it in 1 L of deionized water, and ultrasonically peel it off for 30 min to obtain a graphene oxide colloidal solution,...
Embodiment 2
[0036] (1) Same as step (1) in Example 1.
[0037] (2) Take 1 g of the prepared graphite oxide and disperse it in 1 L of deionized water, ultrasonically strip it for 30 min to obtain a graphene oxide colloidal solution, then add 10 ml of hydrazine hydrate, stir and react in a water bath at 100°C for 24 hours, wash and separate and drying to obtain a graphene powder, and dispersing the graphene powder in ethylene glycol to obtain a graphene dispersion.
[0038] (3) Dissolve 6 g of tin sulfate and 2.5 g of sodium hydroxide in 50 ml of deionized water, and under vigorous stirring, drop the sodium hydroxide solution into the tin sulfate solution at a rate of 1 ml / min to form hydroxide Tin colloid solution.
[0039] (4) Add the graphene dispersion obtained in step (2) to the tin hydroxide colloidal solution in step (3), control the mass ratio of graphene to tin hydroxide to 1:1, sonicate for 3 hours, drop After 2-3 drops of polyacrylic acid, wash, centrifuge, and dry to obtain ti...
Embodiment 3
[0043] (1) Same as step (1) in Example 1.
[0044] (2) Take 1 g of the prepared graphite oxide and disperse it in 1 L of deionized water, and ultrasonically peel it off for 30 min to obtain a graphene oxide colloidal solution. Then add 10 ml of formaldehyde, stir and react in a water bath at 100°C for 24 hours, wash, separate, and dry to obtain graphene powder, and disperse the graphene powder in ethylene glycol to obtain a graphene dispersion.
[0045] (3) Dissolve 10 g of tin chloride pentahydrate and 2.5 g of sodium hydroxide in 50 ml of deionized water, and drop the sodium hydroxide solution into the tin chloride solution at a rate of 1 ml / min under vigorous stirring , forming tin hydroxide colloidal solution.
[0046] (4) Add the graphene dispersion obtained in step (2) to the tin hydroxide colloidal solution in step (3), control the mass ratio of graphene to tin hydroxide to 3:7, ultrasonicate for 3 hours, drop Wash after 2-3 drops of polyacrylamide, centrifuge filter ...
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