Pre-lithiated hollow-structure silicon-oxygen-carbon negative electrode composite material as well as preparation method and application thereof
A hollow structure, composite material technology, applied in negative electrodes, structural parts, battery electrodes, etc., can solve the problems of insufficient lithiation, uneven lithium replenishment of negative electrode materials, and inability to fully improve the first coulomb efficiency, so as to improve battery performance. , shape and size controllable, material saving effect
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[0049] Based on this, the present invention provides a method of preparing a pre-lithiature hollow structure silicone electrode composite, including the following steps, can be referred to Figure 4 :
[0050] S10 is prepared by magnetron sputtering, the silica oxygen cladding layer is prepared on the surface of the solid polymer to obtain a first intermediate;
[0051] S20 is prepared on the surface of the silicon oxygen coating on the surface of the silicon oxygen coating to obtain a second intermediate;
[0052] S30 is heat-treated against the second intermediate, and the solid polymer is decomposed to prepare a silicone carbon negative composite material having a hollow structure;
[0053] The S40 is prepared from the surface of the carbon cladding layer by magnetron sputtering.
[0054] The apparatus of the apparatus employed in the surface of the present invention can be referred to Figure 5 ,exist Figure 5 In the middle, 5 indicates the distribution cabinet, 6 indicates the ...
Embodiment 1
[0087] This embodiment provides a pre-lithiated hollow structure silicone negative electrode composite material and a preparation method thereof. The steps are as follows:
[0088] (1) PMMA microspheres having a diameter of 3 μm are placed in a vacuum chamber for the surface of the powder surface, the vacuum pressure is 2.0 × 10 vacuum pressure. -3 PA; turn on the turntable, the speed is 3 rpm; into argon, the flow is 600 sccm; the flow rate is 100 sccm; the flow rate is 100 scim; the bias is -100V, the duty ratio is 60%; opening the silicon target, the power of the silicon target is 8KW, A silicon oxygen coating having a thickness of 50 nm is deposited in the surface of the PMMA microsphere to give a first intermediate containing a PMMA microspheres and a silicone coating.
[0089] (2) Turn off the silicon target and oxygen, turn on the carbon target, the power of the carbon target is 5 kW, the argon flow is 600 sccm, the bias is 60%, the duty ratio is 60%, maintaining the turnta...
Embodiment 2
[0093] This embodiment provides a pre-lithiated hollow structure silicone negative electrode composite material and a preparation method thereof. The steps are as follows:
[0094] (1) PMMA microspheres having a diameter of 3 μm are placed in a vacuum chamber for the surface of the powder surface, the vacuum pressure is 2.0 × 10 vacuum pressure. -3 PA; turn on the turntable, the speed is 3 rpm; into argon, the flow is 600 sccm; the flow rate is 100 sccm; the flow rate is 100 scim; the bias is -100V, the duty ratio is 60%; opening the silicon target, the power of the silicon target is 8KW, A silicon oxygen coating having a thickness of 50 nm is deposited in the surface of the PMMA microsphere to give a first intermediate containing a PMMA microspheres and a silicone coating.
[0095] (2) Turn off the silicon target and oxygen, turn on the carbon target, the power of the carbon target is 5 kW, the argon flow is 600 sccm, the bias is 60%, the duty ratio is 60%, maintaining the turnta...
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Abstract
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