Nano-porous silicon/carbon negative electrode material, preparation method thereof and lithium ion battery
A carbon negative electrode material and nanoporous technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of large electrolyte, increased electron transmission distance, consumption, etc.
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Embodiment 1
[0023] Preparation of nanoporous silicon / carbon anode materials:
[0024] 1) Combined with the Mn-Si alloy phase diagram, the atomic ratio of silicon and manganese is designed to be 70:30; in an argon atmosphere, the alloy ingot is first prepared by arc melting pure manganese block and pure silicon block, and then rotated at a high speed (5000r / The cold surface of the copper roller of min) rapidly cools the remelted alloy ingot to obtain a precursor alloy strip with a uniform nanocrystalline two-phase structure, and the Mn in the precursor alloy strip 11 Si 19 Phase and Si phase coexist;
[0025] 2) The precursor alloy strips were placed in a concentration of 1M (NH 4 ) 2 SO 4 solution, heated to 60°C for chemical dealloying, after 24h the Mn 11 Si 19 The Si phase is completely dissolved and the Si phase is retained to obtain nanoporous silicon strips; first, the nanoporous silicon strips are washed three times with water and alcohol, and then washed with alcohol for on...
Embodiment 2
[0032] The difference with embodiment 1 is:
[0033] Preparation of nanoporous silicon / carbon anode materials:
[0034] 1) Combined with the Mn-Si alloy phase diagram, the atomic ratio of silicon and manganese is designed to be 65:35; in an argon atmosphere, the alloy ingot is first prepared by arc melting pure manganese block and pure silicon block, and then rotated at a high speed (4000r / The cold surface of the copper roller of min) rapidly cools the remelted alloy ingot to obtain a precursor alloy strip with a uniform nanocrystalline two-phase structure, and the Mn in the precursor alloy strip 11 Si 19 Phase and Si phase coexist;
[0035] 2) The precursor alloy strips were placed in a concentration of 1M (NH 4 ) 2 SO 4 solution, heated to 60°C for chemical dealloying, after 24h the Mn 11 Si 19 The Si phase is completely dissolved and the Si phase is retained to obtain nanoporous silicon strips; firstly wash the nanoporous silicon strips with water and alcohol for 4 ...
Embodiment 3
[0039] The difference with embodiment 1 is:
[0040] Preparation of nanoporous silicon / carbon anode materials:
[0041] 1) Combined with the Mn-Si alloy phase diagram, the atomic ratio of silicon and manganese is designed to be 70:30; in an argon atmosphere, the alloy ingot is first prepared by arc melting pure manganese block and pure silicon block, and then rotated at a high speed (3000r / The cold surface of the copper roller of min) rapidly cools the remelted alloy ingot to obtain a precursor alloy strip with a uniform nanocrystalline two-phase structure, and the Mn in the precursor alloy strip 11 Si 19 Phase and Si phase coexist;
[0042] 2) The precursor alloy strips were placed in a concentration of 1M (NH 4 ) 2 SO 4 solution, heated to 60°C for chemical dealloying, after 24h the Mn 11 Si 19 The Si phase is completely dissolved and the Si phase is retained to obtain nanoporous silicon strips; first, wash the nanoporous silicon strips with water and alcohol for 3 t...
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