Lithium-sulfur battery positive electrode active material with self-repairing function and preparation method thereof
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A positive electrode active material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, chemical instruments and methods, etc., can solve problems such as destroying the stability of the positive electrode, and achieve the effects of alleviating adverse reactions, long service life, and high safety.
Active Publication Date: 2020-02-04
HARBIN INST OF TECH
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Problems solved by technology
[0003] The present invention is to solve the problem that the active material of the positive electrode will be in the α-S during the charging and discharging process of the existing lithium-sulfur battery. 8 and Li 2 The transition between S leads to its volume change, which destroys the technical problem of the stability of the positive electrode, and provides a lithium-sulfur battery positive electrode active material with self-repair function and its preparation method
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specific Embodiment approach 1
[0024] Specific implementation mode 1: This implementation mode is a lithium-sulfur battery cathode active material with self-repairing function, which is specifically composed of sulfur and component A-component B;
[0025] The component A is amino silicone oil, chitosan or polyethyleneimine;
[0026] The component B is terephthalaldehyde, glutaraldehyde or trimesaldehyde.
specific Embodiment approach 2
[0027] Embodiment 2: This embodiment is a preparation method of the lithium-sulfur battery cathode active material with self-repairing function in Embodiment 1, specifically according to the following steps:
[0028] 1. Preparation of the self-repairing coating mixture: dissolve component B in the solvent, stir for 1-120 minutes, add component A, and stir for 1-120 minutes to obtain the self-repairing coating mixture;
[0029] The component A is amino silicone oil, chitosan or polyethyleneimine;
[0030] The component B is terephthalaldehyde, glutaraldehyde or trimesaldehyde;
[0031] Described solvent is THF or toluene;
[0032] The volume ratio of the mass of the component B to the solvent is (1mg~1000mg):(1mL~500mL);
[0033] The volume ratio of the mass of the component A to the solvent is (1g~20g):(1mL~500mL);
[0034] 2. Sulfur powder surface adsorption self-repair coating: Grind micron-sized elemental sulfur for 1min to 100min, then add sulfur powder to the self-repa...
specific Embodiment approach 3
[0036] Specific embodiment 3: The difference between this embodiment and specific embodiment 2 is that the volume ratio of the mass of component B described in step 1 to the solvent is (1 mg-1000 mg): 10 mL. Others are the same as in the second embodiment.
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Abstract
The invention discloses a lithium-sulfur battery positive electrode active material with a self-repairing function and a preparation method thereof, and relates to a lithium-sulfur battery positive electrode material and a preparation method thereof. The invention aims to solve the technical problem of volume change caused by conversion of an active substance of the positive electrode between alpha-S8 and Li2S in the charging and discharging process of the existing lithium-sulfur battery. The lithium-sulfur battery positive electrode active material with the self-repairing function is preparedfrom sulfur and amino silicon oil (chitosan, polyethyleneimine)-terephthalaldehyde (glutaraldehyde and 1,3,5-benzenetricarboxaldehyde). According to the invention, a layer of self-repairing network is adsorbed on the surface of sulfur, the volume change of the positive electrode active material in the charging and discharging process is relieved when sulfur is used as the positive electrode active material of the lithium-sulfur battery, the positive electrode active material is prevented from entering an electrolyte, the shuttle effect of polysulfide is reduced, and the capacity and utilization rate of the positive electrode active material are improved.
Description
technical field [0001] The invention relates to a lithium-sulfur battery cathode active material and a preparation method thereof. Background technique [0002] With the development of society, the fields of military energy and civilian energy put forward higher requirements for battery capacity performance. Lithium-sulfur batteries rely on their ultra-high theoretical specific capacity (1675mAh / g) and theoretical specific energy (2600Wh / kg). become the focus of research. In addition, natural elemental sulfur is non-toxic and harmless, and is abundant in nature, which makes lithium-sulfur batteries more economical and environmentally friendly. Despite the above advantages, problems such as low loading and utilization of active materials in lithium-sulfur batteries, polysulfide shuttle effect, and self-discharge greatly limit the application of lithium-sulfur batteries. The reason for these problems is that during the charging and discharging process of the lithium-sulfur b...
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