A soft and hard carbon composite negative electrode material, its preparation method and a capacitor comprising the negative electrode material
A negative electrode material and capacitor technology, which is applied in the field of electrochemical energy storage components, can solve the problems that the electrochemical performance of the product needs to be further improved and has not been given, and achieve the effects of good consistency, high yield and low cost
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Embodiment 1
[0066] The present embodiment provides a kind of preparation method of negative electrode material, and its specific method is:
[0067] (1) Weigh 50kg of coal tar pitch (produced in Hebei, softening point 80°C, soft carbon precursor), 50kg of sucrose (produced in Jiangsu, purity ≥ 99.8%, melting point 165°C, hard carbon precursor), according to soft carbon and hard carbon The precursor was put into a high-temperature reactor (produced in Jiangsu) at a mass ratio of 1:1, and stirred at a high temperature of 220°C for 7 hours to obtain a homogeneously mixed precursor melt.
[0068] (2) The precursor melt is subjected to multi-stage atomization treatment to obtain spherical negative electrode precursor particles. Spherical precursor particles were tested for particle size on a laser particle size analyzer (produced in the UK).
[0069] (3') The negative electrode precursor particles were pre-carbonized at 360°C for 4 hours in a nitrogen-protected carbonization furnace to remove...
Embodiment 2
[0077] This embodiment provides a method for preparing a negative electrode material. For the specific method, refer to Example 1. The difference is that in step (1), 70 kg of coal tar pitch and 30 kg of sucrose are put into the soft carbon and hard carbon precursors according to the mass ratio of 7:3. high temperature reactor.
[0078] figure 2 It is the cycle life diagram of the lithium ion capacitor made of the negative electrode material prepared in Example 2. It can be seen from this figure that the 600F lithium ion capacitor sample made of the negative electrode material prepared in Example 2 is in the range of 3.8~2.2V Charge and discharge at a constant current of 10A, and the capacity remains above 90% after 10,000 cycles.
[0079] What was obtained in this example was a soft and hard carbon composite negative electrode material, and the test results are shown in Table 1.
Embodiment 3
[0081] This embodiment provides a method for preparing a negative electrode material. The specific method refers to Example 1. The difference is that in step (1), 30 kg of coal tar pitch and 70 kg of sucrose are input according to the mass ratio of soft carbon and hard carbon precursors of 3:7. high temperature reactor.
[0082] What was obtained in this example was a soft and hard carbon composite negative electrode material, and the test results are shown in Table 1.
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