5705 results about "Current collector" patented technology

The preparation method comprises the following steps: S1, mixing a hydrochloric acid solution with organic sodium sulfonate, then adding aniline and water, stirring and dissolving, then adding an oxidizing agent to carry out doping reaction, and carrying out suction filtration, washing, drying and grinding on a reaction product to obtain sodium-modified polyaniline; s2, uniformly mixing a negative electrode active material, a conductive agent and polytetrafluoroethylene, and then adding sodium polyaniline and an organic sodium supplement agent in a nitrogen or inert atmosphere for fibration treatment to obtain fibration powder; and S3, performing hot pressing on the fiberized powder onto the current collector to obtain the lithium ion battery. The prepared pre-sodium-modified negative electrode dry-method electrode has relatively good peeling strength and pole piece flexibility, and the condition that a traditional wet-method thick electrode is easy to crack is relieved; meanwhile, the dry-method electrode subjected to sodium modification treatment can induce uniform deposition of sodium ions, so that the dynamic performance of the whole sodium battery is improved, the problem of cyclic sodium precipitation is avoided, and the service life of the battery is further prolonged.

The invention provides a pole piece and a manufacturing method thereof, a rolling system and a secondary battery, and the manufacturing method of the pole piece comprises the following steps: coating slurry on a current collector and drying to obtain a dried pole piece; the difference between the thickness of the dried pole piece and the preset thickness after rolling is used as the total rolling reduction; the dried pole piece is subjected to continuous multi-stage rolling, adjacent two-stage rolling is carried out, the percentage of the rolling reduction of the previous-stage rolling in the total rolling reduction is larger than or equal to the percentage of the rolling reduction of the next-stage rolling in the total rolling reduction, and the sum of the rolling reduction of all stages of rolling is equal to the total rolling reduction; in the multi-stage rolling, the rolling reduction of each stage of rolling is gradually reduced on the whole; and the multi-stage rolling is cold pressing. According to the manufacturing method of the pole piece, the multi-stage rolling mode is adopted, the rolling reduction decreasing and roller gap adjusting mode is adopted, the diameter, roughness and hardness of the roller body are combined to adapt to different rolling reduction, and finally the consistency of stress release and the pole piece is achieved.

A slidable current collector has an array of terminals with carbon brushes for contacting conductor rails to deliver electrical power to a moving work machine. The terminals have upper sections with a conductive post, lower sections that include a reservoir of liquid metal, and bladders that connect the upper sections with the lower sections. Magnets surround outer shells of the terminals. Fluid above a threshold pressure fed into the bladders holds the upper sections apart from the lower sections and forces the magnets away from the conductor rails. Fluid below the threshold pressure allows the magnets to clamp the terminals to the conductor, lowers the conductive post into the liquid metal, and urges the carbon brushes against the conductor rails. The bladders provide a fluid suspension distributed across the array of terminals, enabling consistent electrical contact and wear for the carbon brushes.

An electromechanical joint provides rotational movement in at least two dimensions while conducting electrical power between orthogonal hubs. The joint, shaped as a cross, has four conical shafts positioned orthogonally and apart from each other within an interior of a housing. Apexes of the conical shafts face each other proximate a centroid of the housing. A conductive fluid, such as Galinstan, fills recesses between the conical shafts. Separate yokes attached to pairs of the hubs may impart forces on the shafts, causing the shafts to rotate within the conductive fluid around orthogonal axes. The conductive fluid provides simultaneous conduction of electrical power between the hubs. The yokes may be affixed respectively to a current collector and conductive arms of a work machine for improved movement and power conduction without the need for additional components.

The invention relates to the technical field of batteries, in particular to a copper foil and a preparation method thereof, a current collector, a pole piece and an energy storage device. A connection degree gamma exists between the surface density of the copper foil and the size and arrangement of the through holes, the formula of the connection degree gamma is # imgabs0 #, and the value range of gamma is 1 + / -0.1; the copper foil is prepared through an electrolytic method, and an insulating acid-resistant coating is dispensed on the surface of a cathode of the electrolytic method to form an insulating acid-resistant layer; according to the electrolytic method, an active layer is formed on the surface of an anode by coating a mixed active substance solution and sintering, an inert substance is coated on the surface of the active layer opposite to a point coating position of a cathode to form an inert layer, and the range of the inert layer is smaller than 70% of the area of a pore region. The porous copper foil prepared by the method has a porous structure, the pore size distribution is more uniform, the size is consistent, meanwhile, the parts except the pores are dense copper layers, and the mechanical property of the material is good.

Provided in the present disclosure are a sodium ion battery, a preparation method for the sodium ion battery, an electrical device and a hard carbon material. The sodium ion battery comprises a negative electrode sheet; the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector; the negative electrode film layer comprises a hard carbon material. On the basis of measurement using the nitrogen adsorption method, the hard carbon material comprises a porous structure, and the porous structure comprises pores having a pore size of 2 nm-8 nm; on the basis of measurement using the nitrogen adsorption method, the pore volume of the pores having a pore size of 2 nm-8 nm is 0.0004 cm3 / g-0.0040 cm3 / g.

The invention provides a composite positive pole piece, a preparation method thereof and a solid-state battery. The composite positive pole piece comprises a positive pole current collector and a positive pole diaphragm arranged on the surface of the positive pole current collector, the positive pole diaphragm comprises a positive pole active material, a conductive agent and a first binder, a three-dimensional pore of the positive pole diaphragm comprises a halide solid electrolyte and a second binder, the three-dimensional pore is the positive pole active material, and the second binder is a second binder. And a gap between the conductive agent and the first binder. According to the composite positive pole piece provided by the invention, the halide solid electrolyte is contained in the three-dimensional pores of the positive pole piece, so that the contact area between the positive pole active material and the electrolyte is maximized, and the diffusion length of ions in the positive pole piece is shortened; the method is used for reducing the interface impedance between a positive electrode active material and an electrolyte in the battery so as to improve the rate capability and the cycling stability of the battery.

A secondary battery includes: a cylindrical case; an electrode assembly in the case and comprising a first tab protruding in a first direction and a second tab protruding in a second direction opposite to the first direction and connected to the case; a current collector plate in the case and comprising a current collector plate body portion connected to the first tab and a current collector plate liquid injection portion on the current collector plate body portion; a cap plate sealing the case so that the electrode assembly and the current collector plate are isolated from an outside; a rivet terminal including a rivet body portion coupled to the cap plate and a rivet liquid injection portion coupled to the current collector plate liquid injection portion; and a sealing portion sealing the current collector plate liquid injection portion and the rivet liquid injection portion.

A secondary battery (100, 200) and an electric device (1). The secondary battery (100, 200) comprises a housing (10), an electrode assembly (20), multiple first tabs (30), and a first adapter (50). The electrode assembly (20) has a laminated structure and comprises multiple first electrode sheets (21) stacked in a first direction (X). Each first electrode sheet (21) comprises a first current collector (210) and a first active material layer (211). The first current collector (210) comprises a first side (2101), a second side (2102), a third side (2103), and a fourth side (2104). The second side (2102) and the fourth side (2104) are arranged opposite to each other in a second direction (Y), and the first side (2101) and the third side (2103) are arranged opposite to each other in a third direction (Z). The dimension W1 of the first side (2101) and the dimension L1 of the second side (2102) satisfy: 1<L1 / W1≤5. Each first tab (30) is integrally formed with a corresponding first current collector (210) and extends out of the first current collector (210) from the first side (2101); and when viewed from the first direction (X), the first tab (30) is connected to a corresponding first active material layer (211) at the first side (2101). The dimension of each first tab (30) in the second direction (Y) is equal to the dimension of a corresponding first side (2101) in the second direction (Y). The first adapter (50) is electrically connected to the first tabs (30) and the housing (10). The energy density and electrolyte infiltration efficiency of the secondary battery (100, 200) are improved, and the first tabs (30) do not require die cutting.

Secondary battery, including a positive electrode sheet comprising a positive electrode current collector and a positive electrode film layer, wherein the positive electrode film layer is arranged on at least one side of the positive electrode current collector and the positive electrode film layer comprises a positive electrode active material; a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer, wherein the negative electrode film layer is arranged on at least one side of the negative electrode current collector and the negative electrode film layer comprises a negative electrode active material, wherein the negative electrode active material comprises graphite and the powder compaction density of the negative electrode active material at 20,000 N is 1.5 g / cm³ 3 up to 1.85 g / cm³ 3 is; and an electrolyte comprising an organic solvent and an organic additive, wherein the organic solvent comprises a first solvent, the first solvent comprising cyclic carbonate, and the mass fraction of the first solvent, based on the total mass of the electrolyte, is 17% to 34%; wherein the organic additive comprises a first and a second additive, the first additive comprising vinylene carbonate and the second additive comprising an ethylene carbonate derivative, and the mass fraction of the first additive is 1.5% to 8% and the mass fraction of the second additive is 0.5% to 4%, each based on the total mass of the electrolyte.

The invention belongs to the technical field of batteries, and provides a battery cell structure and a manufacturing method and application thereof, the manufacturing method comprises the following steps: forming a plurality of positive electrode insulation partitions arranged at intervals on a to-be-coated surface of a positive electrode current collector, and forming a positive electrode active layer in an area between every two adjacent positive electrode insulation partitions to obtain a positive electrode roll; and unwinding the positive electrode insulation partition, a negative electrode roll and a solid electrolyte membrane roll, carrying out rolling compounding to obtain a composite electrode roll, and cutting the positive electrode insulation partition to obtain the battery cell structure. The positive electrode insulation partition can insulate the periphery of the positive electrode active layer with a smaller area, can compensate the size difference of the positive electrode and the negative electrode, and provides support for the negative electrode in the subsequent rolling compounding process, so that the sizes of the positive electrode and the negative electrode are consistent, and the problem of short circuit caused by edge shearing stress during pressure application is solved; roll-in compounding can effectively improve densification and improve electrolyte interface contact, and the manufacturing method is simple, convenient, economical, efficient and suitable for mass production.

The invention provides a negative electrode plate and a lithium ion battery, the negative electrode plate comprises a negative electrode current collector, a first negative electrode active layer and a second negative electrode active layer, the negative electrode current collector comprises a first region and a second region, the first region is arranged on the negative electrode current collector, the second region is located between the edge of the negative electrode current collector and the edge of the first region, the first negative electrode active layer is arranged in the first region, and the second negative electrode active layer is arranged in the second region; the Young's modulus of the second negative electrode active layer is greater than the Young's modulus of the first negative electrode active layer. According to the negative electrode plate provided by the invention, the second negative electrode active layer is arranged in the second region of the negative electrode current collector, the Young modulus of the second negative electrode active layer is greater than that of the first negative electrode active layer, and the relatively large Young modulus can inhibit volume expansion generated by the edge of the negative electrode plate in the charging and discharging process, so that the extension stress in the width direction of the negative electrode plate is reduced; the condition of corner damage caused by excessive extension of the negative plate is improved, so that the safety performance of the lithium ion battery is improved.

The invention provides a modified negative pole piece, a battery and a battery system. The modified negative pole piece comprises a negative current collector; the modified active material layer is arranged on the surface of at least one side of the negative electrode current collector; the modified active material layer comprises an active material layer and a surface modification layer which are arranged in a laminated manner along the direction far away from the negative electrode current collector; the surface modification layer comprises at least two sub-modification layers, each sub-modification layer comprises a binder and a fast ion conductor electrolyte, and the content of the binder in the sub-modification layers is gradually reduced along the direction far away from the negative electrode current collector. On one hand, the infiltration state of the pole piece in the battery can be improved, the diffusion path of lithium ions can be shortened, the problem of stripping or falling of the active substance layer on the pole piece can be improved, and the structural stability of the battery can be improved, so that the rate capability and the cycle performance of the battery can be improved; the safety performance of the battery is improved and the overall cost of the battery is reduced.

The invention provides rolling equipment, a current collector, a preparation method of the current collector, a pole piece, a battery and a device. A rolling device comprises a roller mechanism, a flow control mechanism and a power mechanism. The roller mechanism comprises at least two opposite rollers arranged at intervals and a flow control mechanism. The flow control mechanism is used for independently controlling the flow of the cooling medium in each cooling channel; the power mechanism is used for driving at least one roller to rotate. According to the rolling equipment, the roller diameter of the roller can be simply, effectively and flexibly adjusted by controlling the flow, so that the thickness of a rolled membrane material is adjusted, for example, a current collector with a large thickness in a tab area is prepared, the current collector is used for preparing an electrode pole piece, the problem of belt breakage in mass production of the electrode pole piece can be solved, and the production efficiency of the electrode pole piece is improved. And the yield of electrode plate production is improved.

Apparatus, systems, and methods described herein relate to the manufacture and use of electrochemical cells with a flame retardant mechanism. In some embodiments, an electrochemical cell includes a first current collector coupled to a first portion of a first pouch, the first current collector having a first electrode material disposed thereon. The electrochemical cell further includes a second current collector coupled to a second portion of the first pouch, the second current collector having a second electrode material disposed thereon. The electrochemical cell further includes a separator disposed between the first electrode material and the second electrode material, the first portion of the first pouch coupled to the second portion of the first pouch to enclose the electrochemical cell. The electrochemical cell further includes a flame retardant material coated to the first pouch and a second pouch, the second pouch enclosing the first pouch and the flame retardant material.

The invention provides a positive pole piece, a battery and a preparation method of the positive pole piece. The positive pole piece comprises a positive current collector and a composite layer arranged on the surface of at least one side of the positive current collector, the composite layer comprises a first composite layer, a second composite layer and a third composite layer which are sequentially arranged along the thickness direction of the positive pole piece, and the first composite layer is arranged on the surface of the positive current collector; the first composite layer comprises a first conductive agent and a first binder, the second composite layer comprises a positive electrode active material, a second conductive agent, a second binder and a first fast ion conductor, and the third composite layer comprises a third conductive agent, a third binder and a second fast ion conductor. According to the invention, the electrochemical performance of the battery prepared by a dry-method electrode preparation process can be effectively improved.

The invention discloses a dry-method electrode film rolling compounding method and dry-method electrode film rolling equipment. The method comprises the following steps: leading out a current collector film from an unpowered unreeling shaft, forming a suspension arc by virtue of self weight, and penetrating through a first roller gap; synchronously unrolling the two dry-method electrode films in an unpowered manner, so that the two dry-method electrode films enter the first roller gap in a self-weight overhanging state and are attached to the two surfaces of the current collector film to form an initial complex; coating the outer side of the initial complex with an isolating membrane to obtain a to-be-heated complex, and enabling the to-be-heated complex to enter a second roller gap after the to-be-heated complex is overhung by self weight; the to-be-heated composite body is subjected to hot-pressing compounding through compounding rollers on the two sides of the second roller gap; and then stripping the isolating membrane and rolling the double-sided dry-method pole piece. According to the method, near-zero tension conveying is achieved through natural suspension, and by matching with isolation film wrapping and one-time double-face pressing of the hot-pressing roller, edge micro-cracking and whole belt breakage of the dry-method electrode film can be effectively avoided, and the interface density and the roll-to-roll production yield are improved.

The invention provides a preparation method of a bipolar current collector based on a selective double-sided modified masking film. The preparation method comprises the following steps: depositing a Ni-Cr alloy layer on a single side surface of an aluminum substrate; one side of the masking film is etched to form a roughened surface, and the other side of the masking film is hydrophobic to form a hydrophobic surface; the roughened surface of the masking film and the surface, without the Ni-Cr alloy layer, of the aluminum matrix are pressed, and the edge is coated with curing glue; and placing the pressed and glued sample in an electroplating solution to electroplate a copper layer, finally cutting off an edge glue sealing area, and stripping the masking film. According to the preparation method, the masking film used for protecting the back surface of the aluminum substrate is subjected to double-sided differential treatment, the edge sealing technology is matched, and the Ni-Cr alloy is adopted for bottoming, so that the adhesive force between the copper plating layer and the aluminum substrate is improved, the risk of causing corrosion of a primary battery is reduced, the bipolar current collector which is firmly combined and has a pure interface can be prepared, and the service life of the bipolar current collector is prolonged. And a feasible solution is provided for realizing light-weight and high-performance current collectors for electronic devices such as lithium batteries and the like.

The utility model provides a battery negative pole piece and battery, battery negative pole piece includes current collector and active layer, active layer is coated on current collector at least one side surface, on the active layer is equipped with a plurality of groove structure along the length direction of current collector, groove structure extends along the width direction of current collector, and the groove structure is equipped with the groove structure. The active layer is divided into a plurality of areas by the plurality of groove structures along the length direction of the current collector, and each area is provided with a plurality of hole structures. According to the battery negative plate, the hole structures and the groove structures which are sequentially and alternately arranged in the length direction of the current collector are adopted, the liquid injection time of the battery is shortened, meanwhile, the liquid retention amount of electrolyte is increased, the wettability of the electrode is improved, the cycle life is prolonged, the service life of the battery is prolonged, and the performance stability of the battery is improved; and the problem that the battery performance is influenced due to poor wettability of the battery negative plate in the prior art is solved.

The invention relates to the field of new energy batteries, in particular to a negative electrode current collector and a preparation method thereof, a pole piece and a battery, and the preparation method comprises the following steps: preparing a carbon nanotube with a hydroxyl group on the surface; mixing a carbon nanotube with hydroxyl on the surface, an isocyanate raw material, diol, water and a second organic solvent, and carrying out heating reflux treatment to obtain a third product; mixing the third product, a polytetrahydrofuran raw material, a second organic solvent and a second ammonium salt, and carrying out a polymerization reaction to obtain a precipitate; carrying out drying treatment on the precipitate, so as to obtain foam polyurethane modified by the carbon nano tube; and taking the foam polyurethane modified by the carbon nano tube as a working electrode, carrying out deposition reaction on the working electrode to obtain a base material with a metal layer deposited on the surface, and washing and drying the base material with the metal layer deposited on the surface. The negative electrode current collector lithium metal battery provided by the invention has relatively large energy density, relatively small battery internal resistance, relatively strong cycle performance and relatively low safety risk.

The invention relates to the technical field of crane electrical power supply, in particular to a crane sliding contact line power supply method which comprises the following steps: S1, monitoring the dynamic deformation quantity of a sliding contact line in real time, and obtaining the real-time contact resistance value of a current collector contact surface; s2, calculating the displacement compensation amount of the sliding contact line connector; s3, dynamically generating target contact pressure and transverse offset of the current collector; s4, a current collector executing mechanism is controlled to adjust the contact pressure and the transverse position; s5, if the contact resistance value is reduced to be below a preset threshold value and the deformation quantity fluctuation range is less than or equal to 0.5 mm, determining that the state is a stable power supply state; and S6, predicting a future deformation inflection point of the sliding contact line, and triggering an active compensation instruction before the inflection point. According to the invention, by constructing the slide wire power supply method integrating real-time monitoring, dynamic compensation and trend prediction, accurate adjustment and foresight control of the problem of unstable contact caused by deformation of the slide wire are realized, and the stability of the power supply system is improved.

An electrode sheet and a manufacturing method therefor, a battery cell, a battery and an electrical apparatus. The electrode sheet includes a current collector, a first insulating layer and a second insulating layer, where the current collector includes a main body part and tabs, the tabs extend from the first end of the main body part, and the first end is one end of the main body part in a first direction. Each tab includes a first portion and a second portion, the first portion being close to the main body part with respect to the second portion, the surfaces of the two sides of the first portion are respectively provided with the first insulating layer and the second insulating layer, and the thickness d2 of the second insulating layer being greater than the thickness d1 of the first insulating layer.

The invention discloses a metro equipment mounting system, and relates to the technical field of metro equipment, the metro equipment mounting system comprises a collector shoe mounted on a metro vehicle chassis and a contact rail mounted beside a metro rail, a shoe body of the collector shoe is in sliding contact with the contact rail, and the collector shoe comprises a supporting seat and a swing arm arranged on the supporting seat; a spring mechanism is further arranged between the swing arm and the supporting seat, a shoe body is arranged at the end, away from the supporting seat, of the swing arm, the swing arm is connected with the shoe body through a base plate, and the base plate is arranged on the swing arm in a swing mode. In the jumping stroke of the shoe body, the base plate drives the shoe body to swing; the shoe body is arranged on the base plate capable of swinging, when the shoe body jumps, swinging of the base drives the shoe body to swing together, the inclination angle is gradually increased, and in the process that the shoe body is away from the contact rail, one side of the shoe body can basically keep in the state of making contact with the contact rail in the direction perpendicular to the advancing direction of a subway.

Embodiments described herein relate to electrochemical cells with multiple separators, and methods of producing the same. A method of producing an electrochemical cell can include disposing an anode material onto an anode current collector, disposing a first separator on the anode material, disposing a cathode material onto a cathode current collector, disposing a second separator onto the cathode material, and disposing the first separator on the second separator to form the electrochemical cell. The anode material and / or the cathode material can be a semi-solid electrode material including an active material, a conductive material, and a volume of liquid electrolyte. In some embodiments, less than about 10% by volume of the liquid electrolyte evaporates during the forming of the electrochemical cell. In some embodiments, the method can further include wetting the first separator and / or the second separator with an electrolyte solution prior to coupling the first separator to the second separator.

Embodiments described herein relate to electrochemical cells with multiple separators, and methods of producing the same. A method of producing an electrochemical cell can include disposing an anode material onto an anode current collector, disposing a first separator on the anode material, disposing a cathode material onto a cathode current collector, disposing a second separator onto the cathode material, and disposing the first separator on the second separator to form the electrochemical cell. The anode material and / or the cathode material can be a semi-solid electrode material including an active material, a conductive material, and a volume of liquid electrolyte. In some embodiments, less than about 10% by volume of the liquid electrolyte evaporates during the forming of the electrochemical cell. In some embodiments, the method can further include wetting the first separator and / or the second separator with an electrolyte solution prior to coupling the first separator to the second separator.

The utility model provides an all-solid-state battery capable of preventing short circuit, and belongs to the technical field of all-solid-state batteries. The all-solid-state battery comprises a solid electrolyte layer, a positive electrode and a negative electrode, the positive electrode and the negative electrode are alternately stacked, the solid electrolyte layer is arranged between the positive electrode and the negative electrode, an insulating layer is arranged on a positive electrode current collector on the side where a tab is located and on the periphery of a positive electrode material area on the opposite side, and insulating tapes are pasted on the upper and lower sides of the positive electrode without the insulating layer. According to the utility model, the gluing ion / electronic insulating layers are arranged at the peripheries of the lugs and the opposite sides of the lugs in the positive electrode material area, and the insulating tapes are adhered to the upper and lower surfaces of the two sides of the positive electrode without the insulating layers, so that short circuit caused by shearing of the edges of the positive and negative electrode pieces under high voltage can be effectively prevented, and the safety and the reliability of the battery are improved.

The invention discloses a negative plate, a preparation method thereof and a solid-state battery, and relates to the technical field of battery materials. The disclosed negative plate comprises a current collector, and a bottom layer with the thickness of 10-50 [mu] m, a middle layer with the thickness of 10-50 [mu] m and a surface layer with the thickness of 10-50 [mu] m which are sequentially arranged on the surface of the current collector, the bottom layer comprises the following components in percentage by mass: 1-30% of small-particle-size solid electrolyte and 0.5-3 microns of D50; the component of the middle layer comprises medium-particle-size solid electrolyte, the mass ratio of the medium-particle-size solid electrolyte is 5-30%, and D50 is 3-5 [mu] m; the component of the surface layer comprises a large-particle-size solid electrolyte, the mass ratio of the large-particle-size solid electrolyte is 5-30%, and D50 is 5-10 [mu] m. Compared with a common negative plate, the negative plate provided by the invention optimizes the ion transmission path, relieves the interface stress and improves the electrochemical performance.

A dual slot die coater including a lower slot and an upper slot, for extrusion coating of an electrode active material slurry on a surface of a continuously moving current collector. The dual slot die coater includes a lower plate, an intermediate plate positioned on the lower plate and an upper plate positioned on the intermediate plate, the lower slot being formed between the lower plate and the intermediate plate, and the upper slot being formed between the intermediate plate and the upper plate, wherein the lower plate, the intermediate plate and the upper plate have a lower die lip, an intermediate die lip and an upper die lip, each forming an front end with respect to the current collector, respectively, and a thickness of the lower die lip is larger than a thickness of the upper die lip and a thickness of the intermediate die lip.

The invention provides a surface treatment agent, a surface treatment method of a copper foil and a copper foil negative electrode current collector, and belongs to the technical field of energy materials. The copper salt is used as a copper source, the N-alkyl pyridine halogen salt ionic liquid is used as a halogen source, the copper salt and the N-alkyl pyridine halogen salt ionic liquid react in the solution to form cuprous halide particles on the surface of the copper foil in situ, the specific surface area and the roughness of the surface of the copper foil negative electrode current collector are increased, the copper foil negative electrode current collector is firmly combined with an active substance, and therefore the specific capacity and the rate of the lithium ion battery are improved; cu < + > in the cuprous halide particles formed on the surface of the copper foil also participates in electrochemical reaction, so that the specific capacity of the lithium ion battery is further improved. The result of the embodiment shows that the capacity of the lithium ion battery prepared from the copper foil negative current collector obtained by carrying out surface treatment on the copper foil by the surface treating agent provided by the invention can reach 825mAh g <-1 >; 100 times of charge-discharge cycles are carried out under the large current density of 1Ag <-1 >, and the retention rate can reach 95%.

The invention provides a negative electrode and a preparation method thereof, a battery and electric equipment. The negative electrode comprises a negative electrode current collector and a negative electrode active material layer arranged on the surface of the negative electrode current collector, the negative electrode active material layer comprises graphite, the orientation value of the negative electrode active material layer is less than or equal to 3, and the binding force between the negative electrode current collector and the negative electrode active material layer is greater than or equal to 0.25 N / 40mm. The negative electrode has excellent ion and electron transmission capability and good internal stability, is favorable for being used in the battery, improves the charge-discharge rate and the cycle capacity retention rate of the battery, and prolongs the service life of the battery.