Modification method of graphite negative plate of lithium ion battery
A technology for lithium-ion batteries and graphite negative electrodes, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of cumbersome process, increase of specific surface area and defects, and decrease of Coulombic efficiency, etc., and achieve simple and controllable preparation process, The effect of excellent cycle performance and excellent rate performance
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Embodiment 1
[0021] Flake graphite will be used as the graphite electrode material to prepare graphite electrode sheets. Using a 1064nm laser, with an output power of 10w and a scanning speed of 10cm / s, set a preset area for laser focus spot scanning on the flake graphite electrode sheet, and perform laser etching under a certain atmosphere to obtain the final graphite electrode sheet.
[0022] The graphite electrode sheet exhibits a discharge specific capacity of 364mAh / g at a current density of 50mA / g, and still has a capacity of 210mA / g at a current density of 1A / g.
Embodiment 2
[0024] Graphitized onion carbon will be used as graphite electrode material to prepare graphite electrode sheet. Using a 1064nm laser, with an output power of 10w and a scanning speed of 10cm / s, set a preset area for laser focus spot scanning on the flake graphite electrode sheet, and perform laser etching under a certain atmosphere to obtain the final graphite electrode sheet.
[0025] as attached figure 1 The graphitized onion carbon anode before and after laser modification shown shows good rate performance.
[0026] The graphite electrode sheet exhibits a discharge specific capacity of 402mAh / g at a current density of 50mA / g, and still has a capacity of 265mA / g at a current density of 1A / g.
Embodiment 3
[0028] Graphitized onion carbon will be used as graphite electrode material to prepare graphite electrode sheet. Using a 450nm laser, with an output power of 5w and a scanning speed of 10cm / s, set a preset area for laser focus spot scanning on the flake graphite electrode sheet, and perform laser etching under a certain atmosphere to obtain the final graphite electrode sheet.
[0029] The graphite electrode sheet exhibits a discharge specific capacity of 371 mAh / g at a current density of 50 mA / g, and still has a capacity of 205 mA / g at a current density of 1 A / g.
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