Silicon anode active substance, preparation method of silicon anode active substance and prepared silylene lithium battery
A technology of active material and silicon negative electrode, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems affecting battery life, destroying electrode structure, and battery capacity decline, and achieves improved electrochemical cycle stability and cycle stability Good performance and prolonged discharge time
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Embodiment 1
[0050] In parts by weight, the following raw materials are obtained:
[0051] Group 1: 100 parts of silicon powder, 20 parts of graphene, 2 parts of Nd, 2 parts of Ge, 2 parts of Sb, 3 parts of Se, 1 part of Bi;
[0052] Group 2: 100 parts of silicon powder, 20 parts of graphene, 5 parts of borax, 2 parts of Nd, 2 parts of Ge, 2 parts of Sb, 3 parts of Se, 1 part of Bi;
[0053] Group 3: 70 parts of silicon powder, 40 parts of vinyltrichlorosilane, 10 parts of dichlorosilane, 20 parts of graphene, 5 parts of borax, 2 parts of Nd, 2 parts of Ge, 2 parts of Sb, 3 parts of Se, and 1 part of Bi;
[0054] Group 3 is divided into two groups 3-1 group and 3-2 group. The difference from group 3-1 is that the graphene in group 3-2 is treated under microwave conditions of 300W power for 5min;
[0055] Take each raw material according to the weight ratio of the raw materials in group 1-3. After mixing the raw materials, raise the temperature to 1300°C at a heating rate of 3°C / s in a nit...
Embodiment 2
[0067] In parts by weight, the following raw materials are obtained:
[0068] Group 1: 90 parts of silicon dioxide, 45 parts of vinyltrichlorosilane, 15 parts of dichlorosilane, 50 parts of graphene, 8 parts of borax, 5 parts of Nd, 5 parts of Ge, 7 parts of Sb, 8 parts of Se, and 3 parts of Bi;
[0069] Group 2: 60 parts of silicate, 50 parts of phenylchlorosilane, 10 parts of dichlorosilane, 30 parts of graphene, 3 parts of borax, 1 part of Nd, 1 part of Ge, 3 parts of Sb, 5 parts of Se, and 2 parts of Bi;
[0070] Group 3: 80 parts of silicon dioxide, 50 parts of vinyltrichlorosilane, 10 parts of dichlorosilane, 40 parts of graphene, 5 parts of borax, 2 parts of Nd, 2 parts of Ge, 2 parts of Sb, 3 parts of Se, 1 part of Bi;
[0071] Group 4: 80 parts of silicon powder, 40 parts of vinyltrichlorosilane, 10 parts of dichlorosilane, 35 parts of graphene, 4 parts of borax, 2 parts of Nd, 2 parts of Ge, 3 parts of Sb, 4 parts of Se, and 2 parts of Bi;
[0072] Group 5: 70 parts...
Embodiment 3
[0085] In parts by weight, the following raw materials are obtained:
[0086] 40 parts of silicon powder, 30 parts of silicon dioxide, 40 parts of vinyltrichlorosilane, 5 parts of cyclosilane, 5 parts of dichlorosilane, 35 parts of graphene, 4 parts of borax, 2 parts of Nd, 2 parts of Ge, 3 parts of Sb, Se4 copies, Bi2 copies;
[0087] Take each raw material according to the weight ratio of the above raw materials, wherein the graphene is crushed to below 50 μm, and then treated under the microwave condition of 500W power for 3 minutes, and cooled;
[0088] After the raw materials were mixed, the temperature was raised to 1500° C. at a heating rate of 5° C. / s in a nitrogen atmosphere, kept at a temperature of 3 minutes, and then cooled to room temperature at a cooling rate of 5° C. / min to obtain a silicon negative electrode active material.
[0089] The silicon negative active material is ground to obtain active material powder with a particle size of 5-20 μm, and the binder ...
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