Thin-film composite lithium battery carbon-silicon cathode material and preparation method thereof
A negative electrode material and composite technology, which is applied in the field of carbon-silicon negative electrode materials and preparations for thin-film composite lithium batteries, can solve the problems of short cycle life, easy expansion, and low cycle efficiency, and achieve extended cycle life, high specific capacity, and cycle life. good performance
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Embodiment 1
[0032] The preparation process is:
[0033] (1) Pickling copper, aluminum, and silicon respectively, followed by vacuum drying to obtain pretreated copper, aluminum, and silicon; pickling with a sulfuric acid solution with a mass concentration of 24%, and the number of pickling times is 4; vacuum drying The drying temperature is 86°C and the drying time is 17h;
[0034] (2) Add the pretreated copper, aluminum, and silicon obtained in step (1) in a mass ratio of 53:43:11, add 48% silicon first, then add copper, aluminum, and finally add the remaining silicon In a high-temperature furnace, heat up and mix, so that the copper-aluminum-silicon alloy is completely mixed to obtain a copper-aluminum-silicon alloy; the temperature for heating and mixing is 1460 ° C, and the time is 5 hours;
[0035] (3) Place the copper, aluminum, and silicon alloy obtained in step (2) in a vacuum environment until it drops to room temperature, and then use an electronic thin film laser cutting machi...
Embodiment 2
[0039] The preparation process is:
[0040] (1) Pickling copper, aluminum, and silicon respectively, followed by vacuum drying, to obtain pretreated copper, aluminum, and silicon; pickling uses hydrochloric acid solution with a mass concentration of 22%, and the number of pickling times is 5; vacuum drying The drying temperature is 83°C and the drying time is 17.5 hours;
[0041] (2) Add the pretreated copper, aluminum, and silicon obtained in step (1) at a mass ratio of 53:42:9, add 48% silicon first, then add copper, aluminum, and finally add the remaining silicon In the high-temperature furnace, heat up and mix, so that the copper-aluminum-silicon alloy is completely mixed to obtain a copper-aluminum-silicon alloy; the temperature for heating and mixing is 1420 ° C, and the time is 5.5 hours;
[0042](3) Place the copper, aluminum, and silicon alloy obtained in step (2) in a vacuum environment until it drops to room temperature, and then use an electronic thin film laser c...
Embodiment 3
[0046] The preparation process is:
[0047] (1) Pickling copper, aluminum, and silicon respectively, followed by vacuum drying to obtain pretreated copper, aluminum, and silicon; pickling with sulfuric acid solution with a mass concentration of 27%, and pickling times for 3 times; vacuum drying The drying temperature is 88°C and the drying time is 16.5 hours;
[0048] (2) Add the pretreated copper, aluminum, and silicon obtained in step (1) at a mass ratio of 55:44:11, add 52% silicon first, then add copper, aluminum, and finally add the remaining silicon In the high-temperature furnace, heat up and mix, so that the copper-aluminum-silicon alloy is completely mixed to obtain a copper-aluminum-silicon alloy; the temperature for heating and mixing is 1480 ° C, and the time is 4.5 hours;
[0049] (3) Place the copper, aluminum, and silicon alloy obtained in step (2) in a vacuum environment until it drops to room temperature, and then use an electronic thin film laser cutting mac...
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