A kind of silicon negative electrode lithium-ion battery and manufacturing method thereof
A technology for a lithium ion battery and a manufacturing method, applied in the field of lithium ion batteries, can solve the problems of short cycle life and low specific capacity, and achieve the effects of excellent charge and discharge performance, high battery energy density and low price
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Embodiment 1
[0028] A silicon negative electrode lithium-ion battery, comprising a positive electrode, a negative electrode and a diaphragm between the positive and negative electrodes, the silicon negative electrode lithium-ion battery is a laminated structure, and the negative electrode is composed of a current collector, an active material, a conductive agent and a bonding agent. The active material is a silicon-carbon composite material coated with a carbon layer, and the carbon layer is formed by pyrolysis of starch. The active substance is prepared through the following steps:
[0029] Step a) Ball milling: 1000g of natural graphite powder and 500g of silicon powder with a particle size of 40 microns were mechanically milled for 4 hours in an argon atmosphere with a ball milling speed of 100rpm to obtain a silicon-carbon composite material, wherein the vibration of the natural graphite powder The density is 0.96g / c㎡;
[0030] Step b) Dissolving and stirring: dissolving 600g of starc...
Embodiment 2
[0035] A silicon negative electrode lithium-ion battery, comprising a positive electrode, a negative electrode and a diaphragm between the positive and negative electrodes, the silicon negative electrode lithium-ion battery is a laminated structure, and the negative electrode is composed of a current collector, an active material, a conductive agent and a bonding agent. The active substance is a silicon-carbon composite material coated with a carbon layer, and the carbon layer is formed by pyrolysis of lactose.
[0036] The active substance is prepared through the following steps:
[0037] Step a) Ball milling: 1500g of activated carbon and 500g of silicon powder with a particle size of 50 microns were mechanically milled with high-energy ball in an argon atmosphere for 5 hours, and the milling speed was 400rpm to obtain a silicon-carbon composite material, wherein the tap density of natural graphite powder was 0.96g / c㎡;
[0038] Step b) Dissolving and stirring: Dissolve 800g...
Embodiment 3
[0043] A silicon negative electrode lithium-ion battery, comprising a positive electrode, a negative electrode and a diaphragm between the positive and negative electrodes, the silicon negative electrode lithium-ion battery is a laminated structure, and the negative electrode is composed of a current collector, an active material, a conductive agent and a bonding agent. The active material is a silicon-carbon composite material coated with a carbon layer, and the carbon layer is formed by pyrolysis of dextrin. The active substance is prepared through the following steps:
[0044] Step a) Ball milling: 2500g of natural graphite powder and 500g of silicon powder with a particle size of 30 microns were mechanically milled with high-energy ball for 7 hours in an argon atmosphere to obtain a silicon-carbon composite material, wherein the tap density of the natural graphite powder was 0.96g / c㎡;
[0045] Step b) Dissolving and stirring: Dissolving 1000g of sucrose in 15000g of dist...
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Abstract
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