30results about How to "Reduce compacted density" patented technology

The invention discloses a preparation method of a silicon-carbon anode material and a lithium ion battery. The preparation method includes: mixing nano-silicon with graphite solid phase, sieving the mixture, mixing the mixture with an amorphous carbon precursor solid phase, sieving the mixture, performing vibrating shaping, and sintering the product to obtain the silicon-carbon anode material. Bymeans of sieving, the graphite, nano-silicon and amorphous carbon precursor are dispersed, so that the surface of graphite can be uniformly coated with the nano-silicon and the surface of nano-siliconcan be uniformly coated with the amorphous carbon precursor; through the vibrating shaping, surface-to-surface contact between the amorphous carbon precursor and the nano-silicon and between the nano-silicon and the graphite is achieved without existence of a gap; through the sintering step, a volatile substance can be slowly volatilized from interior to exterior, so that a problem of forming pores since a huge gas pressure is generated from the volatile substance can be avoided. The silicon-carbon anode material, when being used for producing the lithium ion battery, shows excellent electrochemical cyclic stability.

A preparing method of a high-power high-energy density lithium ion battery is provided. According to the lithium ion battery, the cathode material is Li(Ni<0.6>Co<0.2>Mn<0.2>)O2/carbon nanotube composite ternary material, the inner core is hollow, the outer core is of a double-layer structure, the first layer is Li(Ni<0.6>Co<0.2>Mn<0.2>)O2, and the outer layer is carbon nanotubes. The preparing method includes following steps: 1) preparing the cathode material and 2) preparing an anode material. The ternary material prepared by the preparing method is structured and uniform in morphology, large in particles, irregular in morphology, and high in conductivity. A particle gap is reduced, and compaction density and conductivity of the ternary material are improved. By a chemical vapor deposition method, the carbon nanotubes with high conductivity are deposited on the surface of the ternary material, thus further improving conductivity and rate performance of the lithium ion battery.

A granule-based wax sweating method comprises the following steps: (1) filling water to the bottom part of a sweating device; (2) heating paraffin to a liquid state, adding sweating granules, and thenadding the mixture in the sweating device; (3) cooling the paraffin to be 10 to 20 DEG C lower than a melting point at the speed of 1 to 4 DEG C/h; (4) releasing the water, pumping warm water to a sweating tank, heating at the speed of 0.5 to 2 DEG C/h, and collecting the paraffin which can sweat at different melting points; (5) melting the paraffin after finishing heating, and enabling a moltenhigh-melting-point paraffin product to flow into an intermediate tank; (6) blowing residual sweating granules and the last one distillate in the sweating tank by using steam, filtering and separatingthe sweating granules and the distillate, and recycling the sweating granules. According to the granule-based wax sweating method disclosed by the invention, the compaction density of sweating raw materials is reduced, outflow of oil content and low-melting-point wax can be facilitated, the fluidity of sweating liquid is improved, and the separation effect is multiplied; meanwhile, the yield of asweating product is higher, a wax melting range is narrower, a wax product is concentrated in molecular weight, and the enthalpy value of a product is higher.

The invention provides a lithium ion battery cathode plate. The lithium ion battery cathode plate comprises a current collector and a cathode material layer deposited on the surface of the current collector; the cathode material layer comprises a number of cathode material stripe units; the adjacent cathode material stripe units are contacted in a conductive manner; and in the adjacent cathode material stripe units, the types and/or contents of the cathode active materials and/or additives are different, wherein the additives are additives with foaming function.

The invention relates to a deep-cone thickening sand bin with a fluidized sand discharging device. The deep-cone thickening sand bin with a fluidized sand discharging device comprises a sand bin body,a material feeding pipe, a flocculant inlet pipe, an overflow tank, a material feeding well, a circulation well, an annular guide cone and a stirring fluidization device, wherein the overflow tank isfixedly connected to the top of the inner wall of the sand bin body, and communicates with a supernatant return pipe, the material feeding well is disposed at the center of the top of the sand bin body, and is fixedly connected with the sand bin body, and the circulation well is disposed in the material feeding well, and is fixedly connected with the material feeding well; a material feeding zoneis formed between the material feeding well and the circulation well, the material feeding pipe communicates with the material feeding zone, and the annular guide cone is disposed directly below thecirculation well, and is fixedly connected with the inner wall of the sand bin body; and the diameter of the top of the annular guide cone is the same as the diameter of the circulation well, a material outlet is formed in the bottom of the sand bin body, and the stirring fluidization device is fixedly connected with the mouth outlet. A special flow field is formed after tailings is introduced into the sand bin, no consumption of waterpower and gas power is generated, the fluidization effect is good, and it is ensured that the mortar concentration and the thickening effect are not reduced.

The invention belongs to the technical field of lithium ions, and particularly relates to a lithium ion battery. According to the lithium ion battery, a positive plate, a negative plate and a diaphragm are laminated in a Z shape and are subjected to hot pressing and assembling to form the lithium ion battery; the positive plate comprises positive slurry, and the positive slurry comprises 93-96 wt% of a positive active material, 2-3 wt% of a conductive agent and 2-4 wt% of a positive binder; and the negative plate comprises negative slurry, and the negative slurry comprises 94.5-96.5 wt% of a negative active material, 1-2 wt% of a conductive agent and 2.5-3.5 wt% of a negative binder. According to the invention, the coating surface density and compaction density of the positive and negative electrodes are reduced; and the glued diaphragm is subjected to hot pressing, so the electrolyte wettability and the electrolyte retention of the positive and negative plates and the diaphragm are improved, the lithium iron phosphate battery is kept in a rich liquid state in a long-term cycle process, and the cycle life of the lithium iron phosphate battery is prolonged.

The invention discloses an additive for a lithium iron phosphate battery coating process and a preparation method thereof, comprising the following steps: 1) mixing a polyvinylidene fluoride adhesive with nitrogen methylpyrrole; 2) adding the additive to the mixture and mixing 0.5-1 hour; 3) Add lithium iron phosphate powder to the mixture, gradually add it three times, and concentrate; 4) Add conductive carbon black to the concentrated mixture, stir evenly, and obtain lithium iron phosphate battery coating technology additive. The additive has good compatibility with the electrolyte, can reduce the surface activity of lithium iron phosphate and PVDF, improve the bonding performance of the material, and solve the problem of powder dropping of the lithium iron phosphate material during the coating process.

The invention discloses a method for quickly sintering ceramsite, and the method comprises the following steps: mechanically grinding silicon carbide for 1-3 hours, and sieving with a 200-400-mesh sieve to obtain silicon carbide powder; weighing sodium phosphate and sodium silicate, and mixing to obtain alkali-activated powder; mixing water with the alkali-activated powder, and stirring until thesodium phosphate and the sodium silicate are completely dissolved to obtain a bonding solution; mixing the silicon carbide powder with the bonding solution, and uniformly stirring to obtain heat-conducting slurry; uniformly coating to-be-sintered ceramsite with the heat-conducting slurry, then drying, and finally performing high-frequency induction heating on the dried ceramsite for 2-8 minutes toobtain the sintered ceramsite. The method is simple in process, convenient to operate and wide in raw material obtaining way. Compared with a traditional ceramsite firing mode, the ceramsite firing method has the advantages that the consumed time is short, the ceramsite compaction density is reduced by 45.86% to the maximum extent, the fired ceramsite strength is improved by 56.97% to the maximumextent, and the ceramsite ignition loss is reduced by 35.92% to the maximum extent.

The invention provides an electrode plate and a lithium ion battery comprising the same. The electrode plate of the present invention comprises: a current collector having two opposite surfaces; an active material layer coated on at least one surface of the current collector; a first coating layer coated on the active material layer; and a second coating layer coated on the first coating layer; wherein the first coating at least comprises a first polymer and a first conductive agent; and the second coating includes at least a second polymer. According to the invention, by constructing the double-layer coating, not only can the needling safety of the battery be improved, but also the electrical performance of the battery can be ensured not to be influenced to the greatest extent.

The invention provides a lithium ion battery electrolyte, which is characterized in that the lithium ion battery electrolyte comprises a desolvation agent and a cosolvent, the desolvation agent is alkali metal nitrate, and the cosolvent is an organic solvent. The cosolvent is selected from one or more of tin salt, magnesium salt, zinc salt, calcium salt, antimony salt and copper salt of hydrofluoric acid, bis (trifluoromethylsulfonyl) imide and trifluoromethanesulfonic acid. The desolvation agent is added into the electrolyte without changing other elements of the lithium ion battery, so that the energy potential barrier of the desolvation step in the charge-discharge process of the lithium ion battery is reduced, the speed of removing the solvation sheath from the solvation Li < + > is increased, and the charge transfer impedance is reduced, thereby reducing the electrochemical polarization; and the rate capability and the low-temperature performance of the lithium ion battery are improved.

The invention discloses a negative pole piece in the field of capacitors, the negative pole piece comprises a negative current collector, and a first active material layer and a second active material layer which sequentially coat the negative current collector, the first active material layer comprises a first active material, and the second active material layer comprises a second active material; the first active substance is at least one of soft carbon, hard carbon, graphite and a silicon carbon material; the second active substance is at least one of graphene, activated carbon, foamy carbon and carbon aerogel. According to the scheme, through the combination of the first active material layer and the second active material layer, the electrolyte transmission pressure under high power can be effectively relieved, the polarization internal resistance is reduced, and the circulation attenuation caused by insufficient electrolyte is reduced.