Preparation method of carbon negative pole material with nano-hole
A carbon anode material and nanopore technology, which is applied in the field of electrochemical materials, can solve the problems of small proportion, limiting the high-current charge-discharge performance of carbon anode materials, and restricting the high-current charge-discharge performance of lithium ion batteries.
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Embodiment 1
[0025] Mix 100 grams of MCMB10-28 (produced by Osaka Gas Co., Ltd., Japan) with 200 grams of potassium persulfate aqueous solution containing 20 wt%, and use it at 30 ° C 60 Co gamma-ray irradiation for 80 hours. Then it was washed until the pH was 7.0, and dried in a drying oven to obtain a modified carbon negative electrode material.
[0026] The preparation of the negative electrode was the same as that of Comparative Example 1, and the test of electrochemical performance was the same as that of Comparative Example 1 except that the modified negative electrode material obtained in this example was used as the negative electrode material. For capacities at different magnifications, see figure 1 . The figure shows that the capacity retention of the carbon anode material at 2C is 91.2% of that at 0.2C.
Embodiment 2
[0030] Mix 100 grams of CMS (produced by Shanghai Shanshan Science and Technology Co., Ltd.) with 300 grams of lithium chloride aqueous solution containing 5 wt%, and use CuK at 100 ° C α X-ray reaction for 2 hours. Then it was washed until the pH was 6.8, and dried in a drying oven to obtain a modified carbon negative electrode material.
[0031] The preparation of the negative electrode was the same as that of Comparative Example 1, and the test of electrochemical performance was the same as that of Comparative Example 1 except that the modified negative electrode material obtained in this example was used as the negative electrode material. For capacities at different magnifications, see figure 1 . The figure shows that the capacity retention of the carbon anode material at 2C is 89.5% of that at 0.2C.
Embodiment 3
[0035] Mix 100 grams of spherical graphite with a carbon content greater than 99.9% (produced by Shandong Qingdao Taineng Graphite Co., Ltd.) with 100 grams of an aqueous solution of hypochlorous acid containing 3 wt%, and use a He / Ne laser to etch at 20°C for 48 hours. Then wash until the pH is 6.5, and dry in a drying oven to obtain a modified carbon negative electrode material.
[0036] The preparation of the negative electrode was the same as that of Comparative Example 1, and the test of electrochemical performance was the same as that of Comparative Example 1 except that the modified negative electrode material obtained in this example was used as the negative electrode material. figure 2 (b) is the transmission electron microscope image observed by JEOL JEM 2011 transmission electron microscope. It can be seen that the graphite surface has many nanopores with a diameter of about 2nm. For capacities at different magnifications, see figure 1 . The figure shows that the...
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