614 results about "Lithium-ion capacitor" patented technology

The invention discloses lithium-enriched anti-perovskite sulfides and a solid electrolyte material. The general formula of the lithium-enriched anti-perovskite sulfides is (LimMn)3-xS1-y(XaYb)1-z, wherein m is more than 0 and less than or equal to 1, n is more than or equal to 0 and less than to 0.5, (m+n) is less than or equal to 1, a is more than 0 and less than or equal to 1, b is more than or equal to 0 and less than 1, (a+b) is less than or equal to 1, x is more than or equal to 0 and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 0.5, z is more than or equal to 0 and less than or equal to 0.5 and x=2y+z; M is H, Na, K, Rb, Mg, Ca, Sr, Ba, Y, La, Ti, Zr, Zn, B, Al, Ga, In, C, Si, Ge, P, S or Se; and X is Fe, Cl, Br or I, and Y is a negative ion. The solid electrolyte material has high ion conductivity and thermal stability and a wide working temperature range, and can be applied to lithium ion batteries, rechargeable metal lithium batteries, lithium liquid flow batteries or lithium ion capacitors.

An object is to suppress electrochemical decomposition of an electrolyte solution and the like at a negative electrode in a lithium ion battery or a lithium ion capacitor; thus, irreversible capacity is reduced, cycle performance is improved, or operating temperature range is extended. A negative electrode for a power storage device including a negative electrode current collector, a negative electrode active material layer which is over the negative electrode current collector and includes a plurality of particles of a negative electrode active material, and a film covering part of the negative electrode active material. The film has an insulating property and lithium ion conductivity.

An energy storage stack of at least two surface-mediated cells (SMCs) internally connected in parallel or in series. The stack includes: (A) At least two SMC cells, each consisting of (i) a cathode comprising a porous cathode current collector and a cathode active material; (ii) a porous anode current collector; and (iii) a porous separator disposed between the cathode and the anode; (B) A lithium-containing electrolyte in physical contact with all the electrodes, wherein the cathode active material has a specific surface area no less than 100 m²/g in direct physical contact with the electrolyte to receive lithium ions therefrom or to provide lithium ions thereto; and (C) A lithium source. This new-generation energy storage device exhibits the highest power densities of all energy storage devices, much higher than those of all the lithium ion batteries, lithium ion capacitors, and supercapacitors.

To improve the long-term cycle performance of a lithium-ion battery or a lithium-ion capacitor by minimizing the decomposition reaction of an electrolytic solution and the like as a side reaction of charge and discharge in the repeated charge and discharge cycles of the lithium-ion battery or the lithium-ion capacitor. A current collector and an active material layer over the current collector are included in an electrode for a power storage device. The active material layer includes a plurality of active material particles and silicon oxide. The surface of one of the active material particles has a region that is in contact with one of the other active material particles. The surface of the active material particle except the region is partly or entirely covered with the silicon oxide.

The invention discloses a method for lithium pre-embedment of a negative electrode of a lithium ion capacitor. The method comprises the following steps that a lithium sheet, a first diaphragm, the negative electrode, a second diaphragm and a positive electrode are sequentially stacked and packaged in a shell and after an organic electrolyte with lithium salt is injected, the lithium ion capacitor is assembled; on the condition that the temperature ranges from -30 DEG C to 60 DEG C, the negative electrode is electrically connected with the lithium sheet, discharging is conducted for one hour to sixty hours, and lithium pre-embodiment of the negative electrode is achieved. According to the method for lithium pre-embedment of the negative electrode of the lithium ion capacitor, the negative electrode is electrically connected with the lithium sheet at the appropriate temperature, after discharging is conducted for one hour to sixty hours, the lithium sheet in the lithium ion capacitor can be slowly dissolved into the electrolyte to form lithium ions, so that the lithium ions are embedded in the negative electrode, lithium pre-embedment of the negative electrode is achieved, and the capacity of the obtained lithium ion capacitor is high. According to the method for lithium pre-embedment of the negative electrode of the lithium ion capacitor, it is only required that the electric connection mode of the negative electrode and the lithium sheet is controlled and the appropriate time and temperature are obtained, the lithium ion capacitor with the high capacity can be obtained, and the method has the advantages of being simple in operation process and the like.

A decomposition reaction of an electrolyte solution and the like caused as a side reaction of charge and discharge is minimized in repeated charge and discharge of a lithium ion battery or a lithium ion capacitor, and thus the lithium ion battery or the lithium ion capacitor can have long-term cycle performance. A negative electrode for a power storage device includes a negative electrode current collector and a negative electrode active material layer which includes a plurality of particles of a negative electrode active material. Each of the particles of the negative electrode active material has an inorganic compound film containing a first inorganic compound on part of its surface. The negative electrode active material layer has a film in contact with an exposed part of the negative electrode active material and part of the inorganic compound film. The film contains an organic compound and a second inorganic compound.

The invention provides a novel lithium pre-embedding method of a lithium ion capacitor. The method comprises the following steps that (1) a battery cell is assembled, and is soaked into an organic solution containing lithium salts; (2) a positive electrode and a negative electrode are respectively connected with a charging and discharging test instrument, and once discharging after once charging is used as a cycle, 1 to 1000 times of cycles are totally carried out, and the lithium pre-embedding on the negative electrode is completed; (3) the battery cell after the lithium pre-embedding completion is taken out and is put into a packaging case, the packaging case is filled with electrolyte and is assembled into a lithium ion capacitor single body. When the method is adopted, the problem of too high cost due to lithium metal, porous current collectors and the like can be effectively solved, the safety can be improved, the technical flow process can be simplified, and the method is applicable to industrial production.

The invention relates to a cathode plate for a lithium-ion capacitor. The cathode plate comprises a current collector, a bottom coating and an upper coating. The bottom coating coats two sides of the current collector, and the upper coating coats the bottom coating. The bottom coating comprises a carbonaceous active material, a conductive agent and a binding agent I. The upper coating comprises stabilized lithium metal powder and a binding agent II. The invention further relates to a method for producing the cathode plate. The method is simple in production process, easy to operate on a large scale and capable of achieving pre-embedding without harsh environments; meanwhile, energy matching between the cathode plate and an activated-carbon anode plate of the lithium-ion capacitor is achieved easily by adjusting the coating thickness.

The invention provides a lithium ion capacitor and a negative electrode plate thereof and a manufacturing method of the negative electrode plate. The negative electrode plate of the lithium ion capacitor comprises a current collector copper foil, an active matter layer and a pre-lithiation matter layer, wherein the active matter layer is arranged on the current collector copper foil and provided with active matters having embedded and/or stripped from lithium ion performance, and the pre-lithiation matter layer is arranged on the active matter layer. The manufacturing method of the negative electrode plate of the lithium ion capacitor includes steps of coating active matter sizing on the current collector copper foil and drying and rolling the same; spraying or sputtering pre-lithiation sizing on the dried current collector copper foil coated with the active matter sizing, and drying and rolling to obtain the negative electrode plate of the lithium ion capacitor, wherein the active matter sizing contains the active matters embedded and/or stripped from lithium ion performance. The lithium ion capacitor comprises the negative electrode plate which is manufactured by the above manufacturing method. The lithium ion capacitor has the advantages that each layer of the negative electrode plate is good in lithium embedded uniformity and consistency, lithium embedding time is short, carrying a preset quantity of lithium by the negative electrode plate can be effectively controlled and the like.

The invention discloses a method for manufacturing a positive pole plate of a lithium-ion capacitor, comprising the following steps: 1) coating size containing super capacitor active materials on an aluminum foil current collector, and drying; 2) coating positive pole size of a lithium ion battery on the aluminum foil current collector containing super capacitor active materials; and 3) drying, cold pressing, drying again, cutting into pieces and stripping to prepare the positive pole plate of the lithium-ion capacitor. The method for manufacturing positive pole plates of lithium-ion capacitors is easily operated, overcomes the shortcomings of unstable size when the positive pole materials of the lithium ion battery and the active materials of the super capacitor active materials are mixed, and is easy for batch production. In addition, the invention also discloses the positive pole plate of a lithium-ion capacitor and the lithium-ion capacitor using the same.

The invention discloses low-temperature organic electrolyte taking gamma-butyrolactone as a base solvent and a preparation method thereof. The organic electrolyte comprises a solvent and lithium tetrafluoroborate (LiBF4), wherein the solvent is a mixture of cyclic gamma-butyrolactone, chain carbonic ester and chain carboxylic ester. The organic electrolyte is suitable to be used by a non-graphite-based cathode lithium ion capacitor, a non-graphite-based cathode lithium ion battery and a non-graphite-based cathode lithium ion system. Compared with the formula of the traditional electrolyte, the organic electrolyte greatly improves the low-temperature performance of an electrochemical device and prolongs the cyclic service life of the electrochemical device on the basis of ensuring the electrochemical performance, and meanwhile is favorable for the safety of the electrochemical device; and the formula of the electrolyte is suitable for the non-graphite-based cathode lithium ion capacitor, the non-graphite-based cathode lithium ion battery and the non-graphite-based cathode lithium ion capacitance battery.

A lithium ion capacitor includes a positive electrode made of a material capable of reversibly doping and dedoping lithium ions and/or anions; a negative electrode made of a material capable of reversibly doping and dedoping lithium ions; and an electrolytic solution made of an aprotonic organic solvent electrolyte solution of a lithium salt. When the negative electrode and/or positive electrode and a lithium ion supply source are electrochemically brought into contact, lithium ions are doped in a negative electrode and/or positive electrode. A positive electrode potential after the positive electrode and negative electrode are short-circuited is 2.0 V (vs. Li/Li⁺) or less. The positive electrode and/or negative electrode has a current collector made of a metal foil that has many holes that penetrate through both sides and have an average diameter of inscribed circles of the through-holes of 100 μm or less.

A lithium-ion capacitor may include a cathode, an anode, a separator disposed between the cathode and the anode, a lithium composite material, and an electrolyte solution. The cathode and anode may be non-porous. The lithium composite material comprises a core of lithium metal and a coating of a complex lithium salt that encapsulates the core. In use, the complex lithium salt may dissolve into and constitute a portion of the electrolyte solution.

The invention provides an internally combined super capacitor which comprises an anode, a cathode, a diaphragm and electrolyte. The internally combined super capacitor is characterized in that the anode and the cathode are composed of active substances and perforated current collectors, the active substance of the anode is a mixture containing built-in lithium metal oxide and active carbon, and the active substance of the cathode is hard carbon. According to the internally combined super capacitor, through the energy storage potential matching technology of the anode and the cathode, the current collectors of the anode and the cathode respectively adopt perforated cathode foil and perforated copper foil, and electrochemical pre-doping of lithium ions is performed on the hard carbon of the cathode through a third electrode, so that the initial charged state of the hard carbon reaches 30% to 80%. According to such a finally obtained super capacitor battery, the characteristics of high specific power, long service life and quick charge of the super capacitor are kept, and the specific energy is greatly increased. Compared with a traditional lithium ion capacitor, the internally combined super capacitor has a great application prospect, and the characteristic of the super long cycle life is reserved. The working voltage of the internally combined super capacitor can reach 4.2 V, the specific energy can reach about 50 Wh/kg, the specific power can reach about 10, 000 W/kg, and the cycle life can reach 50, 000 times.

The present invention provides a three-dimensional network aluminum porous body in which the cell diameter of the three-dimensional network aluminum porous body is uneven in the thickness direction, and a current collector and an electrode respectively using the aluminum porous body, and a production method thereof. That is, such a sheet-shaped three-dimensional network aluminum porous body for a current collector has a cell diameter uneven in the thickness direction. Particularly, it is preferred that when a cross section in the thickness direction of the three-dimensional network aluminum porous body is divided into three regions of a region 1, a region 2 and a region 3 in this order, the average of the cell diameter in the region 1 and the cell diameter in the region 3 differs from the cell diameter in the region 2.

The present invention is directed to a method for pre-lithiation of negative electrodes during lithium loaded electrode manufacturing for use in lithium-ion capacitors. There is provided a system and method of manufacture of LIC electrodes using thin lithium film having holes therein, and in particular, to the process of manufacturing lithium loaded negative electrodes for lithium-ion capacitors by pre-lithiating electrodes with thin lithium metal films, wherein the thin lithium metal films include holes therein, and the lithium loaded negative electrodes are manufactured using a roll-to-roll lamination manufacturing process.

It is to provide a lithium ion capacitor having a high energy density, a high output density, a large capacity and high safety.

A lithium ion capacitor comprising a positive electrode, a negative electrode and an aprotic organic solvent solution of a lithium salt as an electrolytic solution, wherein a positive electrode active material is a material capable of reversibly supporting lithium ions and anions, a negative electrode active material is a material capable of reversibly supporting lithium ions, and the potentials of the positive electrode and the negative electrode are at most 2.0 V after the positive electrode and the negative electrode are short-circuited, characterized in that the positive electrode and the negative electrode are respectively made by forming electrode layers by the positive electrode active material and the negative electrode active material on both sides of a positive electrode current collector and a negative electrode current collector each having pores penetrating from the front surface to the back surface, the capacitor has such a cell structure that the positive electrode and the negative electrode are wound or laminated, and the outermost portion of the wound or laminated electrodes is the negative electrode.