A kind of lithium-ion supercapacitor pre-embedded lithium method

Abstract

The invention relates to a method for pre-inserting lithium in a lithium ion supercapacitor, including a method for preparing a positive electrode sheet: preparing a mixed glue solution of a binder and a solvent; adding a macromolecule polymer monomer to the mixed glue solution, and uniformly using a stirring process After dispersion, a mixed solution of mixed glue and polymer monomers is obtained; inorganic lithium salt is added to the obtained mixed solution, and a stirring process is used to prepare the mixed glue, polymer monomers and inorganic lithium salts to uniformly disperse adding a conductive agent and a positive electrode material activated carbon into the obtained dispersion liquid, and uniformly dispersing by a stirring process to obtain a slurry; coating the obtained slurry on a current collector to obtain a positive electrode sheet. The lithium ion supercapacitor targeted by the present invention incorporates polymer monomers and inorganic lithium salts into the positive electrode to realize a low-cost, high-efficiency and controllable pre-lithium intercalation process, and solves problems such as the aforementioned uncontrollable lithium doping amount and existence of Safety hazards and the use of materials that are sensitive to the environment lead to high environmental costs.

Description

technical field [0001] The invention relates to lithium-ion supercapacitor technology, in particular to a method for pre-embedding lithium in a lithium-ion supercapacitor. Background technique [0002] With the depletion of global fossil energy and the increasingly prominent environmental pollution problems, there is an urgent need for people to develop new energy storage devices. Favored. Lithium-ion batteries have an energy density of up to 250Wh / kg, but their relatively low power density prevents them from being charged and discharged at high rates, and their low-temperature performance and cycle performance are poor; supercapacitors have a power density of up to 10kW / kg , can achieve fast charging and discharging, and has a long cycle life (>104 times), but its energy density is much lower than that of lithium-ion batteries, only 5-10Wh / kg. Therefore, when lithium-ion batteries or supercapacitors are used alone, due to their respective performance disadvantages, the...

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Problems solved by technology

[0008] In the above scheme (1), it is difficult to control the amount of lithium doping in the implementation of pre-intercalation of lithium with a single lithium source, and it is prone to safety hazards such as volume changes, short circuits, and thermal runaway. In addition, using a single lithium source for pre-intercalation of lithium will consume a lot of time; scheme (2) adopts the implementation scheme of doping the cathode material of conventional lithium-ion batteries in the anode, forming a structure in which the capacitance and the battery are connected in parallel. greater impact; scheme (3) uses a sacrificial lithium salt, and after the first cycle, some of the remaining part loses its activity and becomes an invalid component, and some escapes or dissolves in the electrolyte in the form of gas, which no longer contributes to the capacity, resulting in The energy density decreases, and the lithium salt used has high environmental requirements. If large-scale production is to be carried out, the cost of environmental control is relatively high, and there is also the possibility of side reactions

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