Lithium secondary cell using boride as negative polar material
A lithium secondary battery and negative electrode material technology, which is applied in the direction of secondary batteries, battery electrodes, active material electrodes, etc., to achieve the effects of safe and reliable use, simple and fast preparation process, and diverse and flexible preparation methods
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Embodiment 1
[0021] Take 1mol / l CoCl 2 200ml of the solution is placed in a flask, and then 230ml of NaBH with a concentration of 2mol / l 4 The solution was added to the flask; the solution in the flask was mechanically stirred during this process. After the reaction was over, the stirring was stopped to separate the layers of the suspension. Remove the supernatant; take out the lower precipitate, wash with deionized water, and filter until AgNO is added dropwise to the eluate. 3 The solution no longer produces a white precipitate. The above-mentioned suction-filtered precipitate was vacuum-dried at 100°C to obtain a boride, which was analyzed by induced coupling plasma spectroscopy, and the composition was Co 2.12 B 1.03 o 3.72 .
[0022] The preparation method of the negative electrode with boride as the active material is as follows: the boride synthesized above and the polytetrafluoroethylene as the binder are mixed uniformly at a mass ratio of 85:15, no conductive agent is added,...
Embodiment 2
[0025] Take 0.2mol / l NiCl 2 300ml of the solution is placed in a flask, and then 200ml of NaBH with a concentration of 0.5mol / l 4 The solution was added to the flask; the solution in the flask was magnetically stirred during this process. After the reaction was over, the stirring was stopped to separate the layers of the suspension. Remove the supernatant; take out the lower precipitate, wash with deionized water, and filter until AgNO is added dropwise to the eluate. 3 The solution no longer produces a white precipitate. After vacuum-drying the above-mentioned suction-filtered precipitate at 90°C, continue heating at 700°C for 0.5 hours, and obtain borides after cooling down. The composition is Ni 3.96 B 0.04 o 0.01 .
[0026] The preparation method of the negative electrode with boride as the active material is as follows: the boride synthesized above, the N-methylpyrrolidone solution of polyvinylidene fluoride as the binder, and the Ni powder as the conductive agent a...
Embodiment 3
[0029] Take 2.92 grams of metal Fe, 3.02 grams of metal Mg, and 1.23 grams of B, mix them uniformly, place them in a ball mill jar under a nitrogen atmosphere, and take out the product after ball milling for 50 hours. After inductively coupled plasma spectroscopic analysis, the composition is Fe 1.02 Mg 2.13 B 0.82 .
[0030] The preparation method of the negative electrode with boride as the active material is as follows: the boride synthesized above, the N-methylpyrrolidone solution of polyvinylidene fluoride as the binder, and the Co powder as the conductive agent are mixed in a mass ratio of 80:10:10 Mix evenly, make a slurry, evenly coat on the copper foil as the current collector, and dry.
[0031] The prepared negative electrode was cut into sheets, and compared with commercial Celgard 2300 separators and metal lithium sheets are assembled into experimental batteries, and the electrolyte uses 1M LiPF 6 - EC / DMC (vol 1:1). After the experimental battery has been ...
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