184 results about "Lithium ion intercalation" patented technology

The invention relates to the field of batteries, in particular to a long-circulation persistent adhesion type negative electrode composite electrode and a preparation method and application thereof. The long-circulation persistent adhesive type negative electrode composite electrode comprises a current collector, and a first adhesive layer, an active slurry coating and a second adhesive layer which are sequentially coated on two sides of the current collector, according to the invention, through the bonding effect between the second bonding layer and the diaphragm, the pole piece is uniformly stressed during cyclic expansion, the wrinkles of the pole piece are improved, the electrolyte infiltration is better in combination with the oil-absorbing conductive agent, the lithium ion transmission efficiency is improved, and the cycle life is prolonged; an interface structure formed by multi-layer coating can buffer lithium ion intercalation / deintercalation stress, so that the pole piece can still keep good binding power after circulation, and the cycle performance of the lithium ion battery can be effectively improved; the conductive agent contents of the first bonding layer, the active slurry coating and the second bonding layer are distributed in a concave gradient manner, so that the resistance is reduced, and the conductivity is enhanced.

The invention belongs to the technical field of lithium batteries, and provides a preparation method of a boron-doped coated lithium iron manganese phosphate positive electrode material and a lithium battery, and the method comprises the following steps: S10, performing first pretreatment based on a lithium source, an iron source, a phosphorus source, a dopant, a dispersant, a first MOF and a solvent to obtain a first precursor; s20, performing first sintering crushing on the first precursor in an inert gas atmosphere to obtain a lithium iron phosphate precursor; s30, performing second pretreatment based on the second MOF, deionized water, a carbon source, a dispersing agent and the lithium iron phosphate precursor to obtain a second precursor; and S40, grinding and drying the second precursor, and carrying out second sintering crushing in an inert gas atmosphere to obtain the lithium iron manganese phosphate positive electrode material. Wherein the first MOF is a boron-based MOF, and the second MOF is a manganese-based MOF. The lithium ion intercalation and deintercalation efficiency is improved, the specific capacity, the cycle capacity retention ratio, the compaction density and the safety of the battery are improved, and the performance of the material is improved from multiple aspects.

The invention discloses an additive for modifying a lithium battery positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The problems that an existing lithium battery positive electrode material is unstable in air, high in total alkali residue and poor in high-temperature stability, and active lithium is consumed due to long circulation are solved. The expression of the additive is LiaMgbMec( PO4) dYe, Me represents a transition metal element, Y represents an anion, a is greater than 0 and less than or equal to 2, b is greater than 0 and less than or equal to 1.5, c is greater than or equal to 0 and less than or equal to 0.4, d is greater than 0 and less than or equal to 1, and e is greater than or equal to 0 and less than or equal to 0.4. The additive is rich in magnesium, so that the positive electrode material can provide effective structural support during lithium ion intercalation / deintercalation, and high-temperature cycle stability is provided; by doping the transition metal element, irreversible lithium loss caused by formation of an SEI film can be counteracted during intercalation / deintercalation of lithium ions, so that the total capacity and the energy density of the battery are improved; the added anion group can reduce the residual alkali of the positive electrode material and reduce the gas production of the lithium battery under high voltage.

The pole core comprises a positive plate and a negative plate, the positive plate comprises a first current collector, a first tab, a first coating part and a second coating part, the first coating part and the second coating part are arranged on the same surface of the first current collector, the first tab is connected to the first current collector, and the first coating part is closer to the first tab than the second coating part. The first parameter of the first coating part is greater than that of the second coating part; a third coating part and a fourth coating part are sequentially arranged on the surface of the negative plate, and the first parameter of the third coating part is greater than that of the fourth coating part; wherein the first parameter is compaction density or surface density, and the first coating part and at least part of the second coating part are located in the orthographic projection of the third coating part on the positive plate. According to the lithium ion battery, the area of the negative plate always exceeds the lithium ion embedding site required by the positive electrode, so that the lithium separation risk of the pole core in the charging and discharging process is reduced.

The present application provides a ternary precursor and a preparation method thereof, a ternary positive electrode material, a lithium ion battery and electrical equipment, and relates to the field of new energy technology. The ternary precursor provided in the present application includes a core, an intermediate layer and an outer shell, the intermediate layer is a dense structure, the outer shell is a high porosity structure, and the activity coefficient is 2.2 to 3.0, and the crystallization coefficient is 0.18 to 0.25. The use of the ternary precursor in the process of sintering with the lithium source can provide more transmission channels for lithium ions; at the same time, during the charge and discharge process, the resistance to lithium ion embedding and extraction is reduced, the lithium ion transmission distance is shortened, and the transmission rate is increased, which can effectively enhance the stability of the internal structure of the positive electrode material. During the charge and discharge cycle, the internal pores can relieve stress concentration and effectively improve the cracking inside the particles, thereby improving the capacity and cycle performance of the positive electrode material, and having superior electrochemical properties.

A rechargeable battery is disclosed. The rechargeable battery comprises an anode, a cathode comprising a lithium-ion intercalation host, and an electrolyte comprising a solvent and a halogen-containing compound acting as an active cathode conversion material, wherein the electrolyte is in contact with the anode and the cathode.

The invention discloses a rechargeable battery. The rechargeable battery includes a negative electrode, a positive electrode comprising a lithium ion intercalation host, and an electrolyte comprising a solvent and a halogen-containing compound acting as an active positive electrode conversion material, wherein the electrolyte is in contact with the negative electrode and the positive electrode.

The invention belongs to the technical field of battery preparation, and particularly relates to a battery and a device. The battery comprises a negative pole piece and a positive pole piece, the negative pole piece comprises a negative current collector and a negative active material layer arranged on at least one surface of the negative current collector, the negative active material layer comprises a negative active material, and the negative active material comprises a silicon-containing material; the silicon content in the negative electrode active material layer and the elongation at break of the negative electrode current collector meet a specific relational expression, and the positive electrode plate comprises a positive electrode current collector; the silicon content in the negative electrode active material layer and the elongation at break of the positive electrode current collector meet a specific relational expression, so that the risk of negative electrode foil cracking caused by negative electrode expansion can be reduced while the lithium ion embedding capacity of the negative electrode is ensured, the risk of positive and negative electrode short circuit caused by the negative electrode foil breaking process can be avoided, and the service life of the negative electrode is prolonged. And the capacity density, the cycle performance and the safety performance of the battery are improved.

The invention belongs to the technical field of battery preparation, and particularly relates to a battery and a device. The battery comprises a negative pole piece, the negative pole piece comprises a current collector and a negative active material layer arranged on at least one surface of the current collector, the negative active material layer comprises a negative active material, and the negative active material comprises a silicon-containing material; the silicon content in the negative electrode active material layer and the elongation at break of the negative electrode current collector meet a specific relational expression, so that the risk of negative electrode foil cracking caused by negative electrode expansion can be reduced while the lithium ion embedding capacity of the negative electrode is ensured, the risk of positive and negative electrode short circuit caused by the negative electrode foil breaking process can be avoided, and the service life of the negative electrode is prolonged. And the capacity density, the cycle performance and the safety performance of the battery are improved.

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a method for preparing a lithium ion battery negative electrode material based on a biomass material, and the method comprises the following steps: 1, pretreating the biomass material, including cleaning and drying to remove impurities and moisture; step 2, carrying out enzyme catalytic degradation on the pretreated biomass material by utilizing cellulase to generate a porous structure material with a high specific surface area; and step 3, carrying out nitrogen-sulfur double-doping reaction in the degraded biomass material, which comprises taking urea and sodium thiosulfate as doping sources, and carrying out reaction under the condition of 40-60 DEG C through nitration enzyme catalysis. Through an enzyme catalytic degradation process, the specific surface area of the biomass material is effectively increased, a porous structure is generated, and the improvement provides more lithium ion intercalation / deintercalation active sites, so that the initial capacity and the overall electrochemical performance of the negative electrode material are remarkably improved.

The present invention relates to a disulfonate compound, a preparation method thereof, an electrolyte, and an energy storage device. The disulfonate compound has an #imgabs0# structure and is applied as an additive to an energy storage device, so that a stable SEI film can be formed on the negative electrode surface of the energy storage device, which can inhibit the decomposition of the solvent in the electrolyte. Since a stable SEI film can be formed on the negative electrode surface, the insertion and deintercalation of lithium ions at low temperatures become smooth, thereby improving the low-temperature performance of the energy storage device. On the other hand, the sulfonate group in the disulfonate compound can coordinate with transition metal ions to form a complex, passivating the positive electrode surface, inhibiting the dissolution of positive electrode metal ions, and reducing the decomposition effect of high-oxidation active substances on the solvent, thereby improving the electrochemical performance of the energy storage device under high-temperature conditions. In the energy storage device, the disulfonate compound can inhibit the increase of DC internal resistance, thereby improving the high-temperature performance and low-temperature performance of the energy storage device.

According to the high-dispersion iron phosphate provided by the invention, the primary particle size of the iron phosphate is 50-100nm, the secondary particle size of the iron phosphate is relatively small, the particle size distribution of the secondary particle is relatively narrow, and the specific surface area of the iron phosphate is 10-12m < 2 > / g. When the iron phosphate is used for preparing the positive electrode material, secondary particles are small in particle size and narrow in particle size distribution, so that the grinding efficiency is improved, the condition of difficulty in crushing is avoided, the batch production of iron and lithium is facilitated, and the production cost is reduced; the primary particles are small in particle size, so that subsequent preparation of the positive electrode material with small primary particle size is facilitated, contact with electrolyte is more sufficient, intercalation / deintercalation of lithium ions is facilitated, the electrochemical activity of the positive electrode material is improved, and the effects of improving the battery capacity and the rate capability are achieved. The invention also provides a preparation method of the high-dispersion iron phosphate, a positive electrode material and a lithium ion battery.

The invention provides a lithium ion battery positive electrode and a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Specifically, through an atomic layer deposition method, lithium hydroxide is obtained through deposition on the surface of a positive electrode, and then zirconium oxide is obtained through continuous deposition; and then, repeating the steps for 10-60 times to obtain the positive electrode coated with the lithium zirconium oxide on the surface. The lithium zirconium oxide coated electrode is obtained by directly depositing the coating on the surface of the positive electrode of the lithium ion battery through the atomic layer precipitation method; the prepared coating layer is compact and uniform, interface side reaction between the positive electrode material and electrolyte can be prevented, the lithium ion intercalation and deintercalation efficiency can be improved, the effect of improving the rate capability and cycle performance of the lithium ion battery can be realized, and the application prospect is good.

The present application discloses an organic electrolyte and a lithium-ion secondary battery, relating to the field of battery technology. The organic electrolyte comprises: lithium tetrafluorooxalate phosphate and an isocyanate compound; the isocyanate compound is selected from a mixture of one or more of a monoisocyanate compound, a diisocyanate compound, and a polyisocyanate compound; wherein the mass ratio of the lithium tetrafluorooxalate phosphate to the isocyanate compound is 2-5:1. The present application, by applying lithium tetrafluorooxalate phosphate and an isocyanate compound to an organic electrolyte, can form a more stable organic-inorganic composite modified SEI film at the negative electrode interface through binding, thereby effectively reducing direct contact between the organic solvent and the negative electrode interface, improving the reversibility of lithium ion insertion / deinsertion, thereby helping to improve the battery's cycle life characteristics, high temperature storage stability, and low temperature discharge capability.

The utility model relates to a laminated core structure which comprises at least two negative pole pieces, at least one positive pole piece and at least one composite pole piece, the at least two negative pole pieces are sequentially arranged along the first direction; one positive pole piece is arranged between every two adjacent negative pole pieces, or one composite pole piece is arranged between every two adjacent negative pole pieces; the composite pole piece comprises a lithium piece and a polymer, and the high polymer coats the lithium sheet. In the laminated core structure, the lithium sheets can supplement lithium ions consumed by forming a solid electrolyte interface (SEI) film in the formation stage of the battery, so that the loss of active lithium is reduced, the initial coulombic efficiency of the battery is further improved, and the overall performance of the battery is enhanced; meanwhile, the polymer sheet also has a good elastic characteristic and can adapt to volume change caused by lithium ion intercalation and deintercalation in the charging and discharging process of the battery, so that the pressure on the shell is reduced, the deformation of the shell is effectively prevented, and the safety of the battery is improved.

The invention discloses a solid-state battery and a positive electrode material thereof. The solid-state battery consists of a lithium storage positive electrode, a battery electrolyte and a lithium-rich negative electrode. Wherein the lithium-storing positive electrode comprises an embedded lithium-storing transition metal chalcogenide and a composite material of the embedded lithium-storing transition metal chalcogenide. The positive electrode material has ionic conductivity and electronic conductivity at the same time, a three-dimensional ionic and electronic conductive network structure is formed in the positive electrode, and the network structure is beneficial to intercalation and deintercalation of lithium ions. The crystal structure of the transition metal chalcogenide can be a layered structure or a SiFerel phase, and transition metal contained in the transition metal chalcogenide can be at least one of IVB, VB, VIB and VIIB group metal elements. In the lithium ion intercalation and deintercalation process, the transition metal is subjected to valence change reaction. By introducing the positive electrode material, the weight ratio of inactive substances in the battery is effectively reduced, and the energy density of the solid electrolyte is further improved.

According to the Si-coated C / C nano composite material, the preparation method thereof and the high-performance lithium ion battery provided by the invention, nano silicon particles and dopamine hydrochloride are used as raw materials, and an amorphous carbon layer is formed on the surface of the raw materials through preparation, so that the conductivity of a silicon negative electrode is improved; and meanwhile, surface passivation or structure collapse of the silicon negative electrode caused by excessive lithium ion embedding is prevented. And carrying out one-step carbonization through a sol-gel method to obtain the silicon-coated carbon / carbon. Compared with the prior art, the silicon-electrolyte contact area is increased, so that the electron / ion transmission kinetics is improved. In addition, the silicon and carbon nanoparticles are mostly anchored on the porous three-dimensional frame, so that the agglomeration phenomenon of the silicon particles of the nanostructure can be prevented, meanwhile, a large amount of space is provided, the violent volume change of the silicon negative electrode in the charging and discharging process is relieved, and the silicon negative electrode is prevented from falling off from the current collector. The prepared lithium ion battery has the advantages of good cycle performance, high energy density, no toxicity, no pollution and the like.

The invention relates to the field of negative electrode materials, and in particular to a method for preparing a high-performance antimony-based negative electrode material. A water-soluble antimony salt, sodium tungstate and a composite surfactant are added to a mixed solvent consisting of anhydrous ethanol and deionized water, stirred and mixed, sealed and heated to 120-140°C for reaction for 24-96 hours, filtered after returning to room temperature, and the precipitate is collected, washed and dried to obtain an antimony-based negative electrode material with a tremella-like structure. The antimony-based negative electrode material with a tremella-like structure is obtained by adding a composite surfactant and regulating the microscopic morphology of the generated product. The tremella-like structure exposes more active sites for lithium ion insertion / extraction, promotes electron transfer and electrolyte penetration, has a certain inhibitory effect on the volume expansion generated during the charge and discharge cycle, improves the cycle stability, and helps to improve the electrochemical performance of the negative electrode material.

The negative plate comprises a current collector and a coating layer, the coating layer is arranged on at least one side of the current collector in the thickness direction, the coating layer comprises a first coating layer and a second coating layer, the first coating layer is arranged on at least one side of the second coating layer in the width direction of the current collector, and the second coating layer is arranged on at least one side of the second coating layer in the width direction of the current collector. The electrode plate is positioned in the edge area of the negative plate; wherein the hard carbon content of the first coating is higher than that of the second coating. The hard carbon content of the first coating is higher than the hard carbon content of the second coating, and the lithium ion diffusion coefficient of the hard carbon is obviously higher than that of the graphite, so that the charging rate of the first coating is obviously higher than that of the graphite. And the problem of lithium separation caused by lithium ion accumulation is reduced.

The present invention discloses a method for preparing a lithium battery positive electrode material in the field of lithium battery processing technology, comprising: mixing a binder with a liquid solvent to form a glue; mixing a lithium source material, a metal oxide precursor, and a conductive agent to form a premixed material; extracting carbon dioxide for compression and condensation to form supercritical carbon dioxide; mixing the glue and the premixed material, and then introducing the supercritical carbon dioxide and thoroughly mixing to form a mixed slurry; after the mixed slurry is mixed, releasing the carbon dioxide in the mixing container until the pressure in the mixing container returns to atmospheric pressure. The present invention enables the metal oxide precursor to react with the positive electrode raw material in supercritical carbon dioxide to form a stable lithium metal oxide with a layered structure, which can provide a stable lithium ion insertion / deinsertion channel, thereby improving the cycle stability and structural integrity of the material, and further improving the structural stability of the positive electrode material after preparation.

The embodiment of the invention provides a structured micro battery and a preparation method thereof. The battery comprises a silicon substrate, a silicon nanowire cluster negative electrode structure, an electrolyte layer and a positive electrode material layer, the silicon nanowire cluster negative electrode structure is arranged on the silicon substrate; the silicon nanowire cluster negative electrode structure comprises a plurality of silicon nanowire clusters; the electrolyte layer and the positive electrode material layer are sequentially stacked and arranged on the silicon nanowire cluster negative electrode structure in a surrounding manner. According to the embodiment of the invention, by increasing the surface area of the electrode, a larger contact interface between the active material and the electrolyte can be provided, and the transmission path of ions and electrons between the electrodes is shorter, so that the capacity, the reaction rate and the power density of the battery can be improved. Meanwhile, due to the flexibility of the silicon nanowires, the silicon nanowires have better tolerance to deformation caused by lithium ion intercalation / deintercalation in the charge-discharge cycle process, looseness and fracture of the material cannot be caused, performance degradation is avoided, and the stability of the battery in the cycle process can be comprehensively improved.

The invention provides a pole piece of a lithium ion battery and a preparation method of the pole piece, the pole piece of the lithium ion battery comprises a current collector and an active material coated on the current collector, and by arranging the active material and an adhesive, the active material can be conveniently and rapidly fixed when being extruded and arranged on the current collector along an angle; the assembly state of the active material on the current collector is stabilized, the active material is placed in the slit die cavity to be extruded, the active material moves and deforms towards the single side direction, so that the structure becomes long and narrow, and the end part of the long and narrow active material is connected with the current collector to be rolled, so that the tortuosity of the lithium ion battery pole piece is reduced, and the service life of the lithium ion battery pole piece is prolonged. And the migration rate of lithium ions in the pole piece and the embedding rate of the lithium ions in the active material are accelerated, meanwhile, the problem that the pole piece is expanded and increased due to lithium ion embedding in the thickness direction of the pole piece is solved, and the probability of deformation of the lithium ion battery is reduced.

The present invention discloses a method for constructing an electrochemical model of a lithium ion battery and a simulation method. In the process of constructing the electrochemical model, the diffusion process of lithium ions in an electrolyte, the diffusion process of lithium ions from the inside to the surface of an active material and from the surface to the inside, the potential distribution of the electrolyte, the potential distribution of the active material, the reaction process of lithium ion embedding and extraction, and the distribution state of the active material in a two-dimensional space are taken into consideration. That is, the electrochemical model introduces the mesoscopic morphology of a positive electrode and a negative electrode into the model, and refines the lithium ion exchange of a solid and a liquid to the boundary conditions, and sets the lithium ion exchange to occur at the solid-liquid interface. After the electrochemical model is used for simulation, the obtained simulation results are more consistent with the characteristics of the lithium ion battery itself, and the simulation results are more accurate and reliable, thereby providing a reliable reference for the subsequent analysis and application of lithium ion batteries.

The invention provides a carbon-coated titanium-based polyanion composite material for a lithium ion battery and a preparation method of the carbon-coated titanium-based polyanion composite material, and the carbon-coated titanium-based polyanion composite material for the lithium ion battery consists of derivative carbon and a titanium-based polyanion material, the mass percentage of the derived carbon in the carbon-coated titanium-based polyanion composite material for the lithium ion battery is 1.5-24.4%, and the balance is the titanium-based polyanion material. Compared with the prior art, the carbon-coated titanium-based polyanion composite material for the lithium ion battery is obtained by adopting the components, and the titanium-based polyanion material has a stable crystal structure and three-dimensional skeleton characteristics, so that volume deformation caused by lithium ion intercalation / deintercalation in the charging and discharging process can be effectively relieved. After the carbon coating layer is overlaid, a protective layer with excellent conductivity and high mechanical strength is formed on the surface of the material, so that pulverization and falling of active substances in circulation are inhibited, corrosion of electrolyte to the electrode material is blocked, and the cycle life of the battery is remarkably prolonged.

The present application relates to the technical field of battery, in particular to a kind of graphite material and its preparation method and application.The present application provides a kind of graphite material, the graphite material includes graphite body, the graphite body has multiple through-hole structures, the hole diameter R of each through-hole structure is 0.07~1.81 μm;The particle size Dv50 of the graphite material and the hole diameter R of the through-hole structure satisfy:3.9≤Dv50 / R≤107.1.The graphite material of the present application has abundant through-hole structure, provides more channels for lithium ion deintercalation, and shortens the solid-phase diffusion path of lithium ion intercalation, so as to improve the rate performance of graphite negative electrode material, and the through-hole channel structure can improve the wettability and liquid retention of electrolyte, thereby improving the cycle performance of battery.

The utility model provides a battery cell and a battery, the battery cell comprises a roll core structure formed by sequentially laminating and winding a positive pole piece, a diaphragm and a negative pole piece, the negative pole piece further comprises an insulating coating, the insulating coating is coated on a second surface, at least part of the insulating coating is located on the outermost ring of the roll core structure, and the insulating coating is located on the outer ring of the roll core structure in the length direction of the negative pole piece. A first interval exists between the head end of the insulating coating and the tail end of the second negative active material layer; the roll core structure comprises a straight area and bending areas located at the two ends of the straight area, and at least part of the first interval is located in the bending areas. Therefore, the insulating coating can be prevented from covering the negative electrode active material layer and extending between the negative electrode active material layer and the negative electrode current collector, so that the poor conductivity of the region is avoided, the lithium ion embedding speed is reduced in the charging process, and the lithium precipitation of the region is slowed down or even avoided, and the safety performance of the battery in use is further improved; and the reduction of the energy density of the battery formed by the roll core structure due to the increase of the thickness of the region of the roll core structure can be avoided.

The application belongs to the technical field of electrochemical energy storage, and particularly relates to a pre-sodium-embedded hard carbon negative electrode sheet and a preparation method and application thereof. The pre-sodium-embedded hard carbon negative electrode sheet comprises the following raw materials in parts by weight: pre-sodium-embedded hard carbon 70-90 parts, conductive agent 5-15 parts, and binder 5-15 parts; and the pre-embedded amount of sodium in the pre-sodium-embedded hard carbon is 5%-30% of the theoretical sodium storage capacity of the hard carbon. The pre-sodium-embedded hard carbon negative electrode sheet has the following beneficial effects: when assembled into a secondary battery, sodium ions in the negative electrode sheet will preferentially react with an electrolyte to form a stable and dense SEI film mainly composed of sodium-containing compounds on the surface of the hard carbon. When assembled into a full battery for the first time, lithium ions are embedded into the negative electrode from the positive electrode, and a large amount of additional lithium is no longer needed to build the SEI film, thereby effectively improving the first coulomb efficiency of the full battery and improving the initial energy density of the battery.

The application provides high-dispersion iron phosphate, wherein the primary particle size of the iron phosphate is 50-100 nm, the secondary particle size of the iron phosphate is small, the secondary particle size distribution of the iron phosphate is narrow, and the specific surface area of the iron phosphate is 10-12 m 2 / g. When the iron phosphate is used to prepare a positive electrode material, the small secondary particle size and the narrow particle size distribution are beneficial to improving the grinding efficiency, and the iron phosphate cannot be broken, which is beneficial to the batch production of iron lithium and reduces the production cost. In addition, the small primary particle size is beneficial to the subsequent preparation of a positive electrode material with a small primary particle size, the positive electrode material can be more fully contacted with an electrolyte, the lithium ion insertion / desorption is facilitated, the electrochemical activity of the positive electrode material is improved, and the battery capacity and the rate performance are improved. The application also provides a preparation method of the high-dispersion iron phosphate, a positive electrode material and a lithium ion battery.

The present application provides a high-nickel ternary positive electrode active material, which comprises a core Li 1+a [Ni x Co y Mn z M b ]O2, and a first shell layer of fast ion conductor Li α Al X Si Y O4, an oxide of R elements of a second shell layer, and a transition layer Li p R q O w The high-nickel ternary positive electrode active material of the present application has a significantly reduced amount of surface miscellaneous lithium, and creatively converts the surface miscellaneous lithium into an effective component of fast ion conductor Li α Al X Si Y O4, Li p R q O w , which significantly improves the electrolyte decomposition gas caused by the surface miscellaneous lithium, so that the high-nickel ternary lithium ion battery has high energy density, good cycle performance and safety performance.

The invention relates to the technical field of lithium ion batteries. Specifically, the invention provides a low-temperature-resistant lithium iron phosphate battery. By changing the formula and the structure of the positive electrode material, the conductivity of the material and the lithium ion intercalation / deintercalation rate are improved; and by optimizing the formula of the electrolyte and cooperatively using the lithium salt with high conductivity and excellent low-temperature performance, the ionic conductivity of the electrolyte is improved, and the interface impedance of the battery is reduced, so that the low-temperature performance of the lithium iron phosphate battery is improved.