A kind of preparation method of sodium ion battery hard carbon negative electrode material
A sodium-ion battery and negative electrode material technology, which is applied in the direction of battery electrodes, carbon preparation/purification, negative electrodes, etc., can solve the problems of low coulombic efficiency and low capacity of negative electrode materials for the first time, and achieve improved rate performance, strong rate performance, High first effect
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Embodiment 1
[0031] Example 1 Preparation of samples No. 1 to No. 10
[0032] In this example, a negative electrode material for a sodium ion battery using coffee grounds as a raw material is prepared, and the steps are as follows
[0033] 1. Pulverize the coffee grounds and pass them through a 100-mesh sieve to obtain coffee grounds powder.
[0034] 2. Add coffee grounds powder to a sufficient amount of acidic solution, stir at room temperature, then wash the sample with deionized water until neutral and dry. Individual samples are then added to a sufficient amount of alkaline solution, stirred at room temperature, and then washed with deionized water to neutrality and dried;
[0035] 3. The sample processed in step 2 is carbonized under an inert gas atmosphere with different heating rates, carbonization temperatures and carbonization times to obtain the negative electrode material for the sodium ion battery.
[0036] See Table 1 for sample numbers, raw materials and preparation conditi...
Embodiment 2
[0039] Example 2 Preparation of samples No. 11 to No. 14
[0040] In this example, a negative electrode material for a sodium ion battery using coffee grounds as a raw material is prepared, and the steps are as follows
[0041] 1. Pulverize the coffee grounds and pass them through a 100-mesh sieve to obtain coffee grounds powder.
[0042] 2. Carbonizing the coffee grounds powder in an inert atmosphere with different heating rates, carbonization temperatures and carbonization times to obtain pre-carbonized coffee grounds samples.
[0043] 3. Add the pre-charcoaled coffee grounds sample to a sufficient amount of acidic solution, stir at room temperature, then wash the sample with deionized water until neutral and dry. Individual samples are then added to a sufficient amount of alkaline solution, stirred at room temperature, and then washed with deionized water to neutrality and dried;
[0044] 4. The sample processed in step 3 is carbonized under an inert gas atmosphere with d...
Embodiment 3
[0047] Example 3 Electrochemical performance characterization of coffee grounds charcoal samples
[0048] 1. Mix the above-prepared active material powder in a ratio of active material: conductive agent: binder = 8:1:1, add an appropriate amount of water, and mix well to form a slurry. Then, the slurry was evenly coated on the aluminum foil and dried in a vacuum environment of 100°C. After thorough drying, it was cut into a 12mm diameter disc for assembling the battery.
[0049] 2. Assemble the button cell in an argon-filled glove box (water, oxygen content 4Dissolve in 1L of ethylene carbonate and diethyl carbonate solution with a volume ratio of 1:1, add 1 wt% fluoroethylene carbonate solution as electrolyte, use glass fiber membrane as separator, and assemble into CR2025 button battery.
[0050] 3. Use the constant current charge-discharge test to detect the electrochemical performance of the button battery, and conduct the constant current charge and discharge test on the ...
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