Preparation method for high-capacity natural graphite negative electrode material
A technology of natural graphite and negative electrode materials, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of fast capacity decay and poor stability, and achieve low cost, high charge and discharge efficiency and PC resistance, and raw materials Effects from a wide range of sources
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Embodiment 1
[0024] Prepare as follows:
[0025] 1. Shaping -100 mesh flake graphite into flake graphite powder with a D50 particle size of 17.0 μm;
[0026] 2. Then the flake graphite powder and coal tar are mixed in the fusion machine, the mass ratio of flake graphite powder: coal tar is 90:10;
[0027] 3. Under the protection of inert gas, heat treatment at 500°C for 18 hours in a drum type resistance furnace;
[0028] 4. Then graphitize at 2800°C for 48 hours;
[0029] 5. Then mix it with petroleum asphalt at a mass ratio of 90:10;
[0030] 6. Under the protection of inert gas, carbonization heat treatment was carried out at 1400°C for 30 hours in a roller kiln to obtain graphite anode materials for lithium-ion batteries. For the enlarged morphology, see figure 1 . The capacity of the button battery made of the graphite negative electrode material is 369.9mAh / g, the initial efficiency is 95.8%, and the discharge capacity (50% PC) is 82.8%.
Embodiment 2
[0032] 1. Shaping -100 mesh flake graphite into flake graphite powder with a D50 particle size of 17.0 μm;
[0033] 2. Then the flake graphite powder and petroleum tar are mixed in the fusion machine, the mass ratio of flake graphite powder: petroleum tar is 90:10;
[0034] 3. Under the protection of inert gas, heat treatment at 700°C for 12 hours in a drum-type resistance furnace;
[0035] 4. Then graphitize at 2800°C for 48 hours;
[0036] 5. Then mix it with petroleum asphalt at a mass ratio of 90:10;
[0037] 6. Under the protection of inert gas, carry out carbonization heat treatment at 1400°C for 30 hours in a roller kiln to prepare graphite negative electrode materials for lithium ion batteries. The button battery made of the graphite negative electrode material has a capacity of 371.7mAh / g, an initial efficiency of 95.8%, and a discharge capacity (50% PC) of 84.0%.
Embodiment 3
[0039] 1. Shaping -100 mesh flake graphite into flake graphite powder with a D50 particle size of 17.0 μm;
[0040] 2. Then the flake graphite powder and petroleum tar are mixed in the fusion machine, the mass ratio of flake graphite powder: petroleum tar is 70:30,
[0041] 3. Under the protection of inert gas, heat treatment at 300°C for 24 hours in a drum type resistance furnace;
[0042] 4. Then graphitize at 2500°C for 60 hours;
[0043] 5. Then mix it with coal tar pitch at a mass ratio of 99:1;
[0044] 6. Under the protection of inert gas, carry out carbonization heat treatment at 1400°C for 10 hours in a roller kiln to prepare graphite negative electrode materials for lithium ion batteries. Its coin cell has a capacity of 365.2mAh / g, an initial efficiency of 95.3%, and a discharge capacity (50% PC) of 82.1%.
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