Method for regenerating anode materials of waste lithium ion secondary battery

[0021] Example 1:

[0022] The shell of the 17500 type lithium ion secondary battery that failed in the charge-discharge cycle was cut open, the positive electrode piece was sorted out, heated at 400°C for 6 hours in an air atmosphere, and the adhesive was removed; the aluminum foil substrate and the positive electrode were mechanically separated. The materials are separated, and the separated positive electrode material is calcined at 800°C for 5 hours in an air atmosphere to remove conductive agents such as carbon; with Li 2 CO 3 Supplement lithium so that the atomic ratio of lithium and cobalt is 1.05:1.00, mix the positive electrode materials with the adjusted ratio evenly, use a tubular resistance furnace, pre-fire and roast in an air atmosphere, grind through a 38.5 μm sieve to obtain a Reused cathode material LiCoO 2 , the regeneration flow chart of the cathode material of the waste lithium ion secondary battery is as follows figure 1 As shown, the XRD structure of the regenerated cathode material is as follows figure 2 shown.

[0023] The positive electrode material obtained from recycling and regeneration is prepared into a positive electrode, and metal lithium is a negative electrode. The two form a button battery, which is charged to 4.3V at 0.1C and discharged to 3V at 0.2C. image 3 Recycled LiCoO for this method 2 The first-week charge-discharge curve of the positive electrode material shows that the first-time charge-discharge specific capacity of the material is 161.1mA/g, the first-time discharge specific capacity is 150.0mA/g, the first-time charge-discharge efficiency is 93.1%, and the first 10-week charge-discharge efficiency and capacity See Table 1. Raw cathode material LiCoO 2 The XRD analysis results of Figure 4 As shown, the original cathode material LiCoO 2 The charge-discharge curve of Figure 5 shown. The reusable cathode material regenerated by this method has the same structure and similar electrochemical performance as the raw material.

[0024] Charge and discharge times