Silicon-based negative electrode and application thereof in lithium ion battery
A silicon-based negative electrode and negative electrode technology, which is applied to battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of experimental requirements and complex operation, time-consuming, unfavorable industrialization, etc., and achieve the improvement of the first Coulombic efficiency and Excellent cycle performance, first coulombic efficiency and cycle performance
Pending Publication Date: 2022-04-01
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology
[0005] Although the above three methods can greatly improve the first efficiency of silicon-based lithium-ion batteries, the experimental requirements and operations are complicated or time-consuming, which is not conducive to industrialization
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Embodiment 1
[0026] (1) Preparation of lithium salt polymer slurry: dissolving lithium bistrifluoromethanesulfonimide in 1,3-dioxolane at a concentration of 1mol / L; dissolving lithium hexafluorophosphate in fluoroethylene carbonate, The concentration is 0.5mol / L. Mix the above two solutions to prepare slurry, the volume ratio of 1,3-dioxolane and fluoroethylene carbonate is 8:2. The prepared slurry was stirred at 800 rpm for 8 h in an argon atmosphere glove box.
[0027] (2) Coating lithium salt polymer slurry on the surface of the silicon negative electrode: take 5 ul of the prepared slurry and drop it on the surface of the silicon negative electrode and spread it out.
[0028] (3) In-situ polymerization of the lithium salt polymer slurry on the surface of the silicon negative electrode to form a lithium salt polymer coating: heat the coated pole piece at 100° C. for 140 s, and in-situ polymerize on the surface of the silicon negative electrode to form a lithium salt polymer coating.
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The invention discloses a silicon-based negative electrode and application thereof in a lithium ion battery. The surface of the silicon-based negative electrode is coated with lithium salt polymer slurry, the lithium salt polymer slurry comprises a lithium salt, a polymer monomer and an initiator, and the lithium salt polymer slurry is subjected to in-situ polymerization on the surface of the silicon-based negative electrode to form a lithium salt polymer coating. The lithium salt polymer coating formed through in-situ polymerization can inhibit pulverization of the silicon-based negative electrode due to volume change in subsequent circulation and avoid subsequent continuous formation of a new SEI layer, and the first coulombic efficiency and the cycle performance of the silicon-based negative electrode lithium ion battery are greatly improved.
Description
technical field [0001] The invention belongs to the technical field of silicon-based negative electrode lithium-ion batteries, and in particular relates to a silicon-based negative electrode and its application in lithium-ion batteries. Background technique [0002] In recent years, silicon-based anodes have been extensively studied. The theoretical specific capacity of silicon-based negative electrode reaches 4200mAhg -1 , a silicon-based negative lithium-ion battery with metal lithium as the positive electrode, with a theoretical energy density of 3587Whkg -1 , which is more than 7 times the energy density of traditional lithium-ion batteries. However, silicon-based negative electrode lithium-ion batteries face some difficulties in application, mainly because the volume expansion of silicon-based negative electrode lithium-ion batteries is violent, reaching 400% during charging and discharging. The silicon particles are broken and crushed, the negative active material f...
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IPC IPC(8): H01M4/13H01M4/137H01M4/38H01M10/0525
Inventor 邓雯雯胡乃琪闫泽华芮振
Owner SUZHOU UNIV OF SCI & TECH