32results about How to "Reduce self-discharge phenomenon" patented technology

The invention relates to a positive electrode for a lithium sulfur battery. The material of the positive electrode is a one or two or above two of a carbon-sulfur composite material, a sulfur-conductive polymer composite material and a sulfur-metal oxide composite material, and the content of sulfur in the positive electrode material is 10-95%; the positive electrode material also contains nano-gold or/and nano-silver particles; and a ratio of the total addition of the nano-gold or/and silver to the mass of the positive electrode material is 1:(0.01-1). The electronic orbital effect of the nano-gold or/and silver is used to complex polysulfide in order to make products in the discharge process maximally fixed in a positive electrode region, so the self discharge phenomenon caused by the dissolution of the polysulfide is effectively inhibited, thereby the coulomb efficiency and the cycle stability of the lithium sulfur battery are improved.

The invention provides a formation method for a lithium ion battery with a long storage life. An anode active substance in the lithium ion battery consists of LiNi0.7Mn0.2Ni0.1O2; the electrolyte of the lithium ion battery comprises additive consisting of vinylene carbonate (VC) and fluoroethylene carbonate (FEC), wherein the VC occupies 0.5-1% of the total volume of the electrolyte, the FEC occupies 1.5-4% of total volume of the electrolyte, and the volume content ratio FEC/EC of the FEC and the VC is above 2. The formation method comprises a staged formation technology and a staged exhaust technology, a stable SEI (Solid Electrolyte Interphase) membrane is formed, anode surface metal can prevent from being dissolved in a battery storage process, and a self-discharge phenomenon is avoided.

The invention discloses a preparation method of a graphene material and a graphene material. The preparation method comprises the following steps: putting graphene oxide containing metal impurities and/or non-metallic impurities into a carrier, and putting the carrier into a high temperature vacuum furnace; vacuumizing the high temperature vacuum furnace to a negative pressure of 60-100Pa; settingthe temperature of the high temperature vacuum furnace to 1250-2500 DEG C, and heating for 60-600min. According to the technical scheme, the high temperature vacuum furnace is used for effectively removing the impurities under the conditions of proper temperature range, vacuum degree range and reaction time according to the difference between the melting and boiling points of graphene and the impurity, the defect of an SP3 structure in the graphene oxide is repaired, and the oxygen-containing functional groups of the graphene oxide are removed, so that the high-quality graphene material withhigher purity is prepared. Furthermore, according to the method, the invention also provides the graphene material.

The invention provides an electrolyte solution, a calcium ion secondary battery and a preparation method of the calcium ion secondary battery, and relates to the field of batteries. The electrolyte solution comprises an electrolyte and a non-aqueous solvent, wherein the electrolyte comprises calcium salt and non-calcium salt; the non-calcium salt comprises any one or a combination of at least twoof lithium salt, sodium salt and potassium salt; more than two different cations corresponding to calcium salt and non-calcium salt are hybridized to enable the electrolyte solution to have high ionicconductivity, the solvation effect can be weakened, the self-discharge phenomenon of the battery can be reduced when the electrolyte solution is applied to the calcium ion secondary battery, a good solid electrolyte interface film is facilitated to be formed at the same time, and the energy density and the cycle performance of the battery can be improved. The invention further provides a calciumion secondary battery comprising the electrolyte solution. In view of the advantages of the electrolyte solution, the calcium ion secondary battery has excellent energy density and cycle performance.The invention also provides a preparation method of the calcium ion secondary battery. The preparation method is simple and stable.

A formation method of a polymer lithium-ion battery with a lithium nickel cobalt manganese oxide cathode relates to the technical field of lithium-ion battery manufacturing and comprises the specificsteps of low-temperature low-rate charging and discharging, pressurized venting, standing, high-rate charging and discharging and the like. The formation method of the polymer lithium-ion battery withthe lithium nickel cobalt manganese oxide cathode according to the invention has the advantages that SEI (solid electrolyte interface) film structure generated has better stability and compactness, lithium ion consumption is reduced, the cycle performance of the polymer lithium-ion battery with the lithium nickel cobalt manganese oxide cathode is improved, the capacity of the battery is given tobetter play, and self-discharge of the battery is weakened.

The invention discloses an all-solid state inorganic electrochromic device, which comprises a transparent glass substrate A, a transparent glass substrate B, a transparent conductive thin film layer I, a transparent conductive thin film layer II, an electrochromic layer, an ion storage layer, an electron blocking layer I, an electron blocking layer II and an ion transport layer, wherein the transparent glass substrate A and the transparent glass substrate B are arranged at two sides; the transparent conductive thin film layer I is arranged near the middle part on the transparent glass substrate A; the transparent conductive thin film layer II is arranged near the middle part on the transparent glass substrate B; the electrochromic layer is arranged at the inner side of the transparent conductive thin film layer I; the ion storage layer is arranged at the inner side of the transparent conductive thin film layer II; the electron blocking layer I is arranged at the inner side of the electrochromic layer; the electronic blocking layer II is arranged at the inner side of the ion storage layer; the ion transport layer is arranged between the electronic blocking layer I and the electronicblocking layer II; a WO3-doped TiO2 thin film is adopted by the electrochromic layer; a lithium phosphorous oxynitride (LiPON) thin film is adopted by the ion transport layer; and a V2O5 thin film isadopted by the ion storage layer, so that the persistent defects that the electrochromic device is unstable in photochromic performance and short in cycle life in the recycling process are avoided.

The invention relates to a non-oxide porous diaphragm material for high-temperature batteries. The non-oxide porous diaphragm material for high-temperature batteries comprises TiB2, ZrB2, SiC, ZrC, TiC, BN, AlN, Si3N4, TiN or porous carbon, and the average particle diameter is 2 mu m. The preparation method of the material comprises the following step: carrying out normal-pressure sintering, hot pressed sintering or field-assisted sintering independently on the raw materials of the non-oxide porous diaphragm material or the combination of the raw materials of the non-oxide porous diaphragm material and raw materials of a diaphragm fixing material, thereby obtaining the non-oxide porous diaphragm material. The non-oxide porous diaphragm material provided by the invention has the advantages of stable performance, simple preparation method, low cost and the like, can effectively prevent short-circuiting and enhance the circulation efficiency and number, and can easily implement industrialization.

The invention provides a formation method of a low-self-discharge lithium ion battery. The formation method comprises: injecting liquid for the first time, performing first formation by controlling charging current in a low-temperature environment, injecting liquid for the second time, performing second formation by controlling current in a normal-temperature environment, and performing third formation in a high-temperature environment, wherein electrolyte components for the first liquid injection and the second liquid injection are different. Through the formation method provided by the invention, a more compact SEI film is formed, the self-discharge is lower after long-term storage, and the longer cycle life is still kept after storage.

The invention provides a para-aramid lithium battery diaphragm and a preparation method thereof.The para-aramid lithium battery diaphragm comprises a wet-process aramid porous membrane layer, and the upper surface and the lower surface of the wet-process aramid porous membrane layer are both covered with aramid nanofiber layers; the aramid nanofiber layer is prepared by coating a para-aramid nanofiber aqueous solution on the wet-process aramid porous membrane layer. The problem that para-aramid is difficult to dissolve in a polar solvent can be effectively solved, and the cycle performance of a battery is further improved while other properties of the obtained lithium battery diaphragm are not reduced.

The invention discloses a lithium-sulfur battery electrolyte additive, an electrolyte and a lithium-sulfur battery. The lithium-sulfur battery electrolyte additive consists of an additive a and an additive b, wherein the additive a is one or more of LiPO2F2, LiBOB and LiPF6; the additive b is one or more of lithium nitrate, potassium nitrate and cesium nitrate. According to the invention, the electrolyte additive is added into the electrolyte, so that the lithium-sulfur battery can effectively inhibit dissolution of polysulfide ions in the formation and circulation processes, and the self-discharge phenomenon is weakened. Therefore, the performance of the lithium-sulfur battery is improved in a high-efficiency, low-cost and convenient-to-operate manner.