Silicon-based negative electrode material and preparation method and application thereof

[0047] This embodiment provides a silicon-based negative electrode material, the raw material of which includes 2 g of tetrabutylphosphine bis(trifluoromethanesulfonyl)imide salt (C 18 H 36 F 6 NO 4 PS 2), 1 g of lithium foil and 20 g of commercially available silicon oxide negative electrode material (SiO / C, the carbon content in the negative electrode material is 4.5 wt%).

[0048] The preparation method of the above-mentioned silicon-based negative electrode material comprises the following steps,

[0049] In an argon-protected glove box, each raw material was put into the ball milling jar of a low-temperature planetary ball mill according to the above-mentioned quality, and ball-milled for 4 hours by means of alternating forward and reverse ball milling to obtain a pre-lithiated silicon-based negative electrode material; wherein, the glove box Medium H 2 O and O 2 The content is less than 0.1ppm; the ratio of ball to material is 20:1, the rotation speed of the ball mi

[0052] This embodiment provides a silicon-based negative electrode material, the raw material of which includes 2 g of tetrabutylphosphine bis(trifluoromethanesulfonyl)imide salt (C 18 H 36 F 6 NO 4 PS 2 ), 1.5 g of lithium foil and 20 g of commercially available silicon oxide negative electrode material (same as Example 1).

[0053] The preparation method of the above-mentioned silicon-based negative electrode material comprises the following steps,

[0054] In an argon-protected glove box, each raw material was put into the ball milling jar of a low-temperature planetary ball mill according to the above-mentioned quality, and ball-milled for 4 hours by means of alternating forward and reverse ball milling to obtain a pre-lithiated silicon-based negative electrode material; wherein, the glove box Medium H 2 O and O 2 The content is less than 0.1ppm; the ratio of ball to material is 20:1, the rotation speed of the ball mill is 400rpm, and the time of forward and reverse alt

[0057] This embodiment provides a silicon-based negative electrode material, the raw material of which includes 2 g of tetrabutylphosphine bis(trifluoromethanesulfonyl)imide salt (C 18 H 36 F 6 NO 4 PS 2 ), 2 g of lithium foil and 20 g of commercially available silicon oxide negative electrode material (same as Example 1).

[0058] The preparation method of the above-mentioned silicon-based negative electrode material comprises the following steps,

[0059] In an argon-protected glove box, each raw material was put into the ball milling jar of a low-temperature planetary ball mill according to the above-mentioned quality, and ball-milled for 4 hours by means of alternating forward and reverse ball milling to obtain a pre-lithiated silicon-based negative electrode material; wherein, the glove box Medium H 2 O and O 2 The content is less than 0.1ppm; the ratio of ball to material is 20:1, the rotation speed of the ball mill is 400rpm, and the time of forward and reverse alter