Preparation method for negative carbon material of lithium ion cell
A technology of lithium-ion batteries and carbon materials, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems that the cycle reversible performance is difficult to meet the requirements of practical applications, so as to improve electrochemical performance, reduce production costs, and solve specific capacity low effect
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Embodiment 1
[0026] Dissolve 5g of epoxy resin in 8g of acetone and cover the surface of 5g of natural graphite powder passing through a 400 mesh sieve, add 2% ethanol solution of ethylenediamine in a 2:1 weight ratio as a curing agent and cure at 120°C for 0.5 hours And raise the temperature to 450°C for carbonization, take out the cured product and crush it through a 300-mesh sieve, then put the crushed product in a crucible containing a certain concentration of oxygen atmosphere, raise the temperature to 700°C at a rate of 3°C / min, and keep it warm for 4 hours to obtain a lithium-ion battery Negative material.
[0027] Use the above materials as the negative electrode, with 1M LiClO 4 The EC plus DEC (1:1 weight ratio) solution was used as the electrolyte, a lithium sheet was used as the counter electrode, and a polypropylene film was used as the separator to make an experimental battery for charge and discharge cycle tests. The initial reversible capacity of the experimental battery i...
Embodiment 2
[0029] Dissolve in 15g dehydrated alcohol with 9g epoxy resin and cover in 1g the natural graphite powder surface that crosses 100 mesh sieves by above-mentioned method, add 10% with the ethanol solution of the ethylenediamine of 2: 1 weight ratio as solidifying agent at 100 Cure at ℃ for 1 hour and heat up to 400℃ for carbonization, take out the cured product and crush it through a 300-mesh sieve, then put the crushed product in a crucible containing a certain concentration of oxygen atmosphere and raise the temperature to 1000℃ at a rate of 1℃ / min, and keep it for 4 hours , to obtain the lithium ion battery negative electrode material.
[0030] Assemble the experimental battery according to the above method for charge and discharge cycle test. The initial reversible specific capacity of the battery is 320mAh / g, the specific capacity after 20 cycles is 314mAh / g, and the decay ratio is 2% of the initial reversible specific capacity.
Embodiment 3
[0032] Dissolve 2g of epoxy resin in 10g of dehydrated ethanol and coat the natural graphite powder surface of 6g through 500 mesh sieves according to the above method, add 2% ethanol solution of ethylenediamine with 4:1 weight ratio as curing agent at 120 Cure at ℃ for 1 hour and heat up to 450℃ for carbonization, take out the cured product and crush it through a 200-mesh sieve, then put the crushed product in a crucible containing a certain concentration of oxygen atmosphere and raise the temperature to 600℃ at a rate of 10℃ / min, and keep it for 10 hours , to obtain the lithium ion battery negative electrode carbon material.
[0033] An experimental battery was assembled according to the above-mentioned experimental method for charge-discharge cycle test. The initial reversible specific capacity of the battery is 282mAh / g, the specific capacity after 20 cycles is 272mAh / g, and the decay ratio is 3.6% of the initial reversible specific capacity.
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