A multi-level structure sio x Negative electrode material and its preparation method and application
A negative electrode material and multi-level technology, applied in the field of multi-level structure SiOx negative electrode material and its preparation, can solve the problems of pulverization and shedding of pole pieces, limiting practical application, etc., to achieve stability improvement, improve reversible specific capacity and cycle stability , the effect of high controllability
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Embodiment 1
[0033] (1) Select Si sheet and SiO2 As a silicon source, the electron beam evaporator is used to deposit on a 5 μm copper foil substrate under vacuum conditions;
[0034] (2) Control Si and SiO 2 Ratio, layer by layer deposition of 15μm Si, 20μm SiO, 20μm SiO 1.2 , 20μm SiO 1.5 , to obtain the multi-level structure SiO x Negative material.
[0035] The obtained material was directly used as the negative electrode material of lithium ion battery for electrochemical performance test. A CR2025 button cell was prepared with a lithium sheet as a reference electrode. In the voltage window of 0.01-2.0V, under the current density of 100mA / g, the specific capacity of the first cycle charging is 1100mAh / g, and the capacity retention rate of 200 cycles is 92%.
Embodiment 2
[0037] (1) Select Si sheet and SiO 2 The silicon chip is used as a silicon source, and is deposited on a 10 μm copper foil substrate by the concentration method under vacuum conditions;
[0038] (2) Control Si and SiO 2 Ratio, deposit 150μm Si and 50μm SiO layer by layer to obtain multi-level structure SiO x Negative material.
[0039] The obtained material was directly used as the negative electrode material of lithium ion battery for electrochemical performance test. A CR2025 button cell was prepared with a lithium sheet as a reference electrode. In the voltage window of 0.01-2.0V, under the current density of 100mA / g, the specific capacity of the first cycle charging is 2300mAh / g, and the capacity retention rate of 200 cycles is 89%.
Embodiment 3
[0041] (1) Select Si sheet and SiO 2 The wafer is used as a silicon source, and is deposited on a 25 μm copper foil substrate by plasma-enhanced chemical vapor deposition under vacuum conditions;
[0042] (2) Control Si and SiO 2 Ratio, layer by layer deposition of 35μm Si, 10μm SiO 0.5 , 10μm SiO, 40μm SiO 1.2 , 10μm SiO 1.5 , 15μm SiO 1.8 , 10μm SiO 1.9 , to obtain the multi-level structure SiO x Negative material.
[0043] The obtained material was directly used as the negative electrode material of lithium ion battery for electrochemical performance test. A CR2025 button cell was prepared with a lithium sheet as a reference electrode. In the voltage window of 0.01-2.0V, under the current density of 100mA / g, the specific capacity of the first cycle charging is 1500mAh / g, and the capacity retention rate of 200 cycles is 90%.
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