9121results about How to "Avoid direct contact" patented technology

The invention provides a method for cladding surfaces of an active material of an anode and / or the anode and methods for manufacturing the anode and a battery. In the cladding method, an atomic layer deposition technology is adopted to deposit surface modification substances on the surfaces of the active material of the anode and / or the anode of a lithium battery. According to the invention, the cycle performance and the specific capacity of the lithium-ion battery can be improved obviously and electrode materials are more stable.

An autonomous navigation and man-machine coordination picking operating system of a picking robot comprises a travelling unit of the picking robot, a picking robot arm, an Agent, a wireless sensor network, a computer and a panoramic stereoscopic visual sensor. The Agent has functions of autonomous navigation, obstacle avoidance, positioning and path planning and the like, the wireless sensor network is used for completing man-machine coordination picking information interaction, the computer is used for providing long-distance intervention and management for picking administrators during man-machine coordination picking operation, and the panoramic stereoscopic visual sensor is used for acquiring panoramic stereoscopic video images in a picking area. The autonomous navigation and man-machine coordination picking operating system of the picking robot is fine in natural flexibility, simple in mechanism, low in control complexity, limited intelligent, high in picking efficiency, fine in environmental adaptation, and low in manufacturing and maintenance costs., Picking objects and crop are not damaged during picking.

The invention relates to a lithium ion battery silicon-based composite anode material, a preparation method of the lithium ion battery silicon-based composite anode material, and a battery. The lithium ion battery silicon-based composite anode material adopts an embedded composite core-shell structure, a core has a structure formed by embedding nano silicon particles into a gap of an inner layer of hollowed graphite, and a shell is made from a non-graphite carbon material. According to the silicon-based composite anode material, mechanical grinding, mechanical fusing, isotropic compression processing and carbon coating technologies are combined, so that the nano silicon particles can be successfully embedded into the inner layer of the graphite and the surfaces of graphite particles are uniformly coated; the high-performance silicon-based composite anode material is obtained and is excellent in cycle performance (the 300-times cycle capacity retention ratio is more than 90%) and high in first efficiency (more than 90%); in addition, the silicon-based composite anode material is high in specific energy and compaction density, and can meet the requirements of a high-power density lithium ion battery; the preparation process is simple, the raw material cost is low, and the environment is protected.

An automatic playing card dispensing system includes a scanner for recognizing the card suits and card values of the dispensed playing cards, a display, a set of indicator lights, and a driver unit for controlling dispensing of the playing cards and driving the display to display the card suits and card values of the dispensed playing cards been scanned by the scanner and the indicator lights to give a respective indication that indicates “Banker Win”, “Player Win” or “Tie Win”.

The invention relates to a live-working robot of a transformer substation. All signals of a control system are wirelessly transmitted, so that the operational safety performance is improved for operation personnel. The live-working robot comprises a work machine and a remote-control command vehicle; the work machine mainly comprises a power system, an actuating mechanism, a hydraulic control system and an operating system, the actuating mechanism mainly comprises a traveling mechanism, a rotating platform, a lifting platform and a hydraulic mechanical arm with six degrees of freedom, the lifting platform comprises a plurality of insulating arms, the rotating platform is mounted on the traveling mechanism, the lifting platform is connected with the rotating platform, and the hydraulic mechanical arm with six degrees of freedom is connected with the lifting platform; and the hydraulic control system comprises a hydraulic pump and is connected with the power system, and the hydraulic pump is further connected with an oil tank on the traveling mechanism and is respectively connected with a lower electromagnetic reversing valve bank A, a central crossover coupling, an upper electromagnetic reversing valve bank B, a mechanical arm hydraulic servo valve bank C, driving cylinders of the various insulating arms and a rotating motor by a distributing valve.

The invention discloses a silicon-carbon composite material, a lithium ion battery, and a preparation method and application of the silicon-carbon composite material. The preparation method of the silicon-carbon composite material comprises the steps: uniformly mixing silicon powder and silicon monoxide powder, then mixing with a solution containing an organic carbon source dispersant, and performing wet-process ball milling to obtain a slurry; uniformly mixing the slurry, graphite and a conductive agent, and performing spray drying to obtain spherical-like particles, wherein graphite is synthetic graphite and / or intermediate-phase graphite; mixing the spherical-like particles and asphalt, performing cladding processing under the inert atmosphere to obtain a cladded material; and then performing carbonizing processing to obtain the silicon-carbon composite material, wherein silicon powder, silicon monoxide powder, graphite and asphalt respectively accounts for 5-15%, 3-10%, 45-75% and 5-40% by weight of the sum of the above materials, and the organic carbon source dispersant and the conductive agent both accounts for 0.1-2% by weight of the sum of silicon powder, silicon monoxide powder and graphite. The silicon-carbon composite material has relatively good cycle performance, and can be directly used as a cathode material of the lithium ion battery. The preparation method is simple in technology, low in cost and applicable to industrial production.

The invention discloses an electrolyte solution for a high-capacity lithium-ion battery. The electrolyte solution includes non-aqueous solvent, lithium hexafluorophosphate, negative electrode film forming additive, positive electrode surface activity inhibiting additive and transition metal ion complexant; the negative electrode film forming additive includes organic ester negative electrode film forming additive of 1 to 10wt% of the total electrolyte solution and inorganic lithium salt negative electrode film forming additive of 0.5 to 2wt% of the total electrolyte solution; the positive electrode surface activity inhibiting additive includes fluorinated ether additive of 1 to 5wt% of the total electrolyte solution and nitrile additive of 0.1 to 5wt% of the total electrolyte solution; the transition metal ion complexant is of 0.1 to 1.0wt% of the total electrolyte solution. The electrolyte solution is adaptive to the high-capacity lithium-ion battery and is capable of optimizing the circulating performance and high-temperature storage performance of the lithium-ion battery. The invention further provides a preparation method of the electrolyte solution and the high-capacity lithium-ion battery adopting the electrolyte solution.

The invention discloses a low-temperature refrigeration air conditioner and a wind speed control method thereof. The low-temperature refrigeration air conditioner comprises a wind speed control deviceof an outdoor unit fan. The wind speed fan control device comprises a temperature detection unit, a fan control unit and the outdoor unit fan, wherein the temperature detection unit detects the temperature of a condenser of the air conditioner so as to obtain a simulated condensation temperature; the fan control unit generates control signals of the rotation speed change and on-off of the fan according to the simulated condensation temperature; and the outdoor unit fan responds to the control signals of the fan control unit and generates corresponding outdoor unit wind speed. The method for controlling the wind speed of the low-temperature refrigeration air conditioner controls the rotation speed change and on-off of the fan by simulating the condensation temperature of the condenser so as to provide different wind speeds for an outdoor unit. Because of simulating a pressure signal by detecting a temperature signal, the air conditioner and the method avoid direct contact between a wind speed control system and a refrigerant system so as to avoid leakage.

The invention discloses a software automated testing unified operation platform. The software automated testing unified operation platform is characterized by comprising a server and a terminal. The server provides hardware and software environment operating on a virtual machine for development, installation, operation and test of various pieces of software. The server provides instruction operating interfaces of independent establishing, improving and updating of the hardware and software environment on the virtual machine for development, installation, operation and test workers of the various pieces of software. The software automated testing unified operation platform comprises downloading or uploading of installation and applications on the virtual machine, and further comprises building, downloading and uploading of an adaptor. The software automated testing unified operation platform has the advantages of achieving unification of the testing platform, reducing testing cost and helping medium-sized and small enterprises break through testing barriers.

The invention discloses a method for preparing a bimetal composite plate by stirring friction braze welding. The method comprises that: a plate with small hardness is used as a covering layer metal plate; a plate with high hardness is used as a base layer metal plate; the covering layer metal plate and the base layer metal plate are horizontally fixed on a working platform surface in a lap joint mode; solders which can generate eutectic reaction with one of the upper / base layer metal plates are preset between the upper / base layer metal plates; a non-needle type cylinder friction device is arranged over the covering layer metal plate; the non-needle type cylindrical friction device is made to rotate and be pressed to be closely contacted with the surface layer of the covering layer metal plate, but not penetrate the covering layer metal plate, and the non-needle type cylindrical friction device rotates in the original position or moves forward along the surface of the covering layer metal plate while rotating; by utilizing frictional heat to melt the solders, the upper / base layer metal plates are both quickly melted in the solders, thereby achieving excellent interface combination; and the excessive solders are squeezed out, and a thin and dense soldering seam is formed, so that the bimetal composite plate is prepared. Compared with the braze welding in a furnace, the method has the advantages of high efficiency, energy conservation, pressure lead-in, unnecessary soldering flux and gas protection and short holding time at a high temperature.

The invention discloses a silicon dioxide composite anode material for a lithium ion battery, as well as a preparation method and an application of the silicon dioxide composite anode material. The silicon dioxide composite anode material is prepared from the components of silicon dioxide powder and a conductive carbon layer with the surface of the silicon dioxide powder is uniformly and densely coated. With the adoption of the silicon dioxide composite anode material, the original component structure of an SiO material system is kept, so that the lower volume effect is ensured; the silicon dioxide dense carbon layer coating structure is successfully realized by adopting the technologies of mixing kneading, sheet rolling, press forming and the like, and thus the first coulombic efficiency of the silicon dioxide composite anode material is remarkably increased, and can reach a theoretical value being larger than 77 percent, and the cycle performance and the conductive characteristic are also remarkably improved, so that the silicon dioxide composite anode material is suitable for being charged and discharged with the large rate and can be applied to the power market.

Provided is a surface Raman and infrared spectroscopy double-enhanced detecting method based on graphene and nanogold compounding.According to the method, light sources, a lens, a graphene nanobelt and gold nanoparticle composite substrate, an infrared Fourier spectrograph and a Raman spectrometer are included.Infrared light waves and visible light waves emitted by the infrared light source and the laser light source respectively pass through a beam combiner and then irradiate the graphene nanobelt and gold nanoparticle composite substrate, after the light waves and trace molecules adsorbed on the substrate interact, reflected light is gathered by the focusing lens to enter the infrared Fourier spectrograph, and meanwhile scattered light is gathered into the Raman spectrometer.Raman scattering signals of the trace molecules can be enhanced through the local area plasma effect of the gold nanoparticles, and meanwhile infrared absorption spectrum signals of the trace molecules can be dynamically enhanced through the graphene surface plasma effect within the broadband range.According to the method, double enhancement of surface Raman and broadband infrared spectroscopy signals is achieved on the same substrate, and the advantages of being wide in enhancement wave band, high in detecting sensitivity, wide in detected matter variety range, good in stability and the like are achieved.

The invention relates to a carbon-coated nano silicon / graphene / cracked carbon layer composition material, a preparation method thereof, and a lithium ion battery including the composition material. The composite material comprises spherical particles formed by uniformly dispersing carbon-coated nano silicon in graphene sheets, and a cracked carbon layer which coats the surfaces of the spherical particles. The carbon-coated nano silicon comprises nano silicon and carbon coating layer which coats the surface of the nano silicon. The method is simple, has excellent process performance and is environment-friendly. The carbon-coated nano silicon / graphene / cracked carbon layer composition material has stable structure and high compact density, has excellent performance when being used as an anode material of the lithium ion battery, has high anode capacity, excellent rate capability and cyclic performance, is more than 1500 mAh / g in first-time reversible capacity, is more than 90% in first-time coulomb efficiency and is more than 90% in 500-time cyclic capacity retention ratio and has low expansion.

The invention discloses a high-voltage live working robot device, which comprises a mobile automobile, a loading foldable and expandable insulating arm, a loading control device and a robot operating platform. The loading foldable and expandable insulating arm is disposed on a chassis of the mobile automobile and comprises a loading hydraulic pump station, a rotary tower, a lower arm, an upper arm, an expandable arm and the like. The loading control device comprises a lower control device and an upper control device, wherein the lower control device is arranged on the rotary tower, and the upper control device is arranged on the robot operating platform. The robot operating platform comprises an insulating bucket, a robot operating system and a mechanical arm insulator support, and a robot operating system comprises a master arm, a mechanical arm, a hydraulic servo control box and a microcontroller. An operator can stand in the insulating bucket to control the master arm and remotely control the mechanical arm to clamp a special tool, and the special tool contacts with a high-voltage line to replace operators to complete aerial live working tasks, so that labor intensity is relieved for operators, and operating efficiency and operational safety are improved.

The invention relates to a composite silicon negative electrode material. The composite silicon negative electrode material comprises nanometer silicon, a nanometer composite layer coating the surface of nanometer silicon and a conductive carbon layer uniformly coating the nanometer composite layer, wherein the nanometer composite layer is silicon oxide and metal alloy. According to the composite silicon negative electrode material with a three-layer structure, the nanometer composite layer composed of the silicon oxide and the metal alloy coating the surface of the silicon oxide effectively reduces volume expansion of the nanometer silicon, maintains the characteristic of high conductivity of the silicon material, improves mobility of lithium ions, prevents direct contact between a silicon negative electrode and an electrolyte, and can form a hard SEI film on the surface of the composite silicon negative electrode material, thereby allowing the cycle performance of the material to be substantially enhanced. The composite silicon negative electrode material has the characteristics of high capacity (greater than 1500 mAh / g), long cycle life (with a capacity retention ratio of more than 90% after 300 cycles) and high conductivity. The preparation method for the composite silicon negative electrode material is simple, easily controllable, and applicable to industrial production.

The invention relates to a silicon-carbon composite negative pole material preparation method and a lithium ion battery. The preparation method comprises putting nanometer silicon and graphite micro-powder into a ball mill, carrying out ball milling uniform dispersion in an organic solvent environment, carrying out vacuum drying, putting the dried mixture and asphalt into a cone-type mixer, carrying out coarse mixing, putting the mixed powder subjected to coarse mixing into a mechanical fusion machine, carrying out mechanical fusion, carrying out heat treatment in an inert gas protective atmosphere and carrying out cooling to obtain the silicon-carbon composite negative pole material. The preparation method carries out asphalt softening coating on nanometer silicon so that silicon particle and electrolyte direct contact is avoided, a capacity reduction rate is delayed, a lithium ion diffusion path is shortened, an electrode material electron conduction loss is avoided, and first charge-discharge efficiency, a charge-discharge electric capacity and cycle performances are improved. Before coating, nanometer silicon is dispersed through graphite micro-powder so that it is avoided that in asphalt coating, nanometer silicon aggregation causes local capacity excess and nanometer silicon is uniformly dispersed.

The invention provides a granular pesticide fertilizer, and a preparation method and application thereof. The granular pesticide fertilizer comprises the following components expressed in mass percent: on the basis that the total mass of the granular pesticide fertilizer is 100%, 0.001 to 20% of a pesticide active component, 70 to 99% of a granular fertilizer carrier, 0.05 to 9% of an organic solvent, 0.05 to 0.5% of a surfactant and 0.05 to 0.5% of a coating agent. According to embodiments in the invention, the pesticide active component and the granular fertilizer carrier in the granular pesticide fertilizer are reasonably combined, which allows the problem of damage by diseases and insects to soil in agricultural production to be effectively overcome and enables soil fertility to be improved and labor and time to be saved. The granular pesticide fertilizer is produced by using a normal temperature spraying adsorption process and a cladding process, so the preparation method for the granular pesticide fertilizer has the advantages of a simple process, low energy consumption, reduction in production cost, easiness in controlling and operating and suitability for industrial production.

The invention discloses a fast ion conductor modified lithium ion battery anode material lithium cobalt oxide comprising lithium cobalt oxide and a lithium fast ion conductor layer coating the outer surface of the lithium cobalt oxide. The lithium fast ion conductor layer comprises the components of Li1+x+yAxB2-xSiyP3-yO12-eN, wherein A is one or more than one of Al, Sc, La, Cr, Fe, Tl, Eu and In, B is one or more than one of Ti, Zr and Hf, N is one or more than one of Li2O, MgO and Y2O3, and x, y and e are all not less than 0 and not more than 2. The preparation method of the fast ion conductor modified lithium ion battery anode material lithium cobalt oxide comprises the following steps of: evenly mixing A, B an N sources, lithium salt, a silicon source, a phosphorus source and a lithium ion battery anode material to be modified, carrying out the processes of drying, roasting, crushing, screening and the like to prepare the lithium ion battery anode material coated with a phosphate system on the surface. The modified anode material lithium cobalt oxide not only can work under a higher voltage and greatly improve the battery capacity, but also greatly improves the cycle performance, the multiplying power performance, the overcharging performance and the safety performance thereof.

The invention provides a composite porous current collector, and a preparation method and an application thereof. The composite porous current collector comprises a porous electron conducting layer with through holes and an electron insulating layer with through holes, wherein the porosity of the through holes of porous electron conducting layer is not less than the porosity of the through holes of the electron insulating layer, a position of the porous electron conducting layer corresponding to the position of the through hole of the electron insulating layer is a through hole, and a position of the porous electron conducting layer corresponding to the position of the non-through hole of the electron insulating layer can be a through hole, and also can be a blind hole or a rough surface. The electron insulating layer is adjacent to an isolation layer, so puncture of precipitated lithium dendrite to a diaphragm is prevented, direct contact of the electron conducting layer is avoided, and the safety of a battery is improved; the above corresponding through hole structure is in favor of transferring lithium ions, so the internal resistance of the battery is reduced; the hole structure of the porous electron conducting layer and the homogeneous rough surface are in favor of full contact of an electrode active substance with the current collector, the current is uniformly distributed, and the current collection effect is improved; and the preparation method adopting airflow punching has the advantages of simplicity, easy implementation, cleanness, energy saving, combination of other various enforcement modes, and convenience for production and application.

The invention discloses a hardware system for cloud development and testing. The hardware system for the cloud development and testing is characterized in that after software development or testing software requirements or hardware requirements are finished customizing by a terminal, a server can automatically found a virtual machine of conducting software development or testing for the terminal; after a user of the virtual machine pays for purchases, a running environment, functional components, data, tools or systems corresponding to the virtual machine are uniformly stored and installed, and run on an independent hardware device, and are offered to the user; after the independent hardware device is accessed to the server through a network, the software development and testing data on the independent hardware device of the user can be automatically synchronized to the virtual machine; after the independent hardware device is accessed to the server through the network, the software development and the testing data generated by the virtual machine in the independent hardware device can also be automatically synchronized to the independent hardware device. According to the hardware system for the cloud development and testing, the software development and test work can be placed and conducted on a cloud platform uniformly. In addition, equipment is ordered through a remote custom software and hardware configuration, so that the sale model of integrated equipment of software and hardware such as a computer, a mobile phone, a tablet computer, a mobile television, a smart television and a game machine can be thoroughly changed.

The invention discloses a three-dimension remote romance system, based on graph transmission, which comprises interactive server terminal and user terminal. Wherein, the server terminal has mode file manage unit, three-dimension romance engine unit, graph code decode compress unit, and network transmission unit; the user terminal has network transmission unit and user interactive unit; when the server terminal receives the browse request of user terminal via the network transmission unit, the mode file manage unit reads the mode file that requesting browse; using three-dimension romance engine unit to romance generate graph data, via the graph code decode compress unit to be compressed, and via network transmission unit, to be sent to the user terminal; user terminal decodes the data of compressed graph, to display it via user interface. The invention uses progressive transmission, multistage delay memory, and the prediction based on user interaction to realize the balance between high real-time property and high accurate browse, to support quick beautiful romance effect to general user.

The invention discloses a leg and wheel hybrid type hydraulic mechanical leg. The leg and wheel hybrid type hydraulic mechanical leg comprises a thigh hydraulic cylinder, a shank hydraulic cylinder, thigh rod plates installed in parallel, shank rod plates installed in parallel, main body connecting plates installed in parallel and thigh hydraulic cylinder connecting plates installed in parallel. A main body cylinder connecting pillar is arranged between a square main body fixing block of the main body connecting plates and a square main body fixing block of the thigh hydraulic cylinder connecting plates. The two main body connecting plates are hinged to the two thigh rod plates respectively. The two thigh rod plates are hinged to the two shank rod plates respectively. A thigh tail end rod parallel to the shank rod plates is fixed between the two shank rod plates through a square shank fixing block. The two ends of the thigh hydraulic cylinder are hinged to the position between the upper portions of the two thigh rod plates and the position between the bottoms of the two thigh hydraulic cylinder connecting plates. The two ends of the shank hydraulic cylinder are hinged to the position between the middles of the two shank rod plates and a side arm plate extending from the two thigh rod plates. According to the leg and wheel hybrid type hydraulic mechanical leg, the structure is simple, control is convenient due to the two hydraulic cylinders, quick switching between two proceeding modes can be guaranteed due to a wheel installed at the knee joint position, and the leg and wheel hybrid type hydraulic mechanical leg can be applied to a four-foot or six-foot robot.

The invention discloses a double-dielectric barrier discharge low-temperature plasma device, and belongs to the field of low-temperature plasma technology. The plasma device comprises an air inlet (1), a polytetrafluoroethylene plug (2), a low voltage electrode (3), a quartz glass tube A (4), a quartz glass tube B (5), a high voltage electrode (6) and an air outlet (7), wherein the outer layer of the high voltage electrode (6) is the quartz glass tube B (5), and the low voltage electrode (3) consists of constantan sheets and is led out by a lead wire and grounded. In the process of treating pollutant gas, the low-temperature plasma generator can effectively reduce the corrosion of air on the high voltage electrode and avoid generating arc discharge and further damaging or breaking down discharge dielectric layers. The formed double-dielectric barrier discharge has high stability and high energy density utilization rate. The low-temperature plasma device can stably work under normal pressure and is applied to the discharge of automotive noxious pollutant gas.

The invention provides a high efficiency livestock and poultry nutrition replenisher and a preparation method thereof, and the nutrition replenisher contains various vitamins, amino acids and electrolyte. Simultaneously, the multi-stage premixing process is adopted by the high efficiency livestock and poultry nutrition replenisher, so that the high mixing uniformity of ultra-trace elements can beensured; and furthermore, sanguinarine is introduced into drinking water nutrition replenisher and is processed by peridium treatment, and emulsification treatment is carried out on liposoluble vitamins, so that good water-solubility can be guaranteed. The high efficiency livestock and poultry nutrition replenisher has comprehensive nutrition, leads all nutrient components to be supplemented witheach other, can effectively prevent deficiency of the vitamins and the amino acids, maintains electrolyte balance, regulates the metabolism of organism, improves the feed conversion rate and the anti-stress capability, stimulates the immune function, reduces the occurrence of diseases, and has remarkable economic and social benefits as well as broad market prospect.

The invention provides a production method and production line for pre-printed surface paper corrugated paperboards, and the production method and production line provided by the invention can be used for solving the problem that the existing corrugated paperboard production line and process can not adapt to the production of pre-printed colorful corrugated paperboards. In the invention, because the bonding mode that surface paper is arranged on a single-sided corrugated paperboard is adopted, the direct contact between color-printing paper and a high temperature hot plate at a drying part can be avoided, thereby effectively preventing the damages on the materials, patterns, gloss oil and plastic films of the color-printing paper. The corrugated paperboard production method and corrugated paperboard production line disclosed by the invention can effectively adapt to the application requirements of pre-printed colorful paper on the premise of not increasing the cost.

The invention discloses a preparation method of a nano-network conductive polymer coated lithium iron phosphate anode material. The preparation method is characterized in that: a surfactant is used as a template; and a conductive polymer monomer is subjected to in-situ polymerization on a lithium iron phosphate surface in a low-temperature acid solution medium and a nano-network structure is grown; and thus, the nano-network conductive polymer coated lithium iron phosphate anode material is formed. The special shape of the nano-network conductive polymer is favorable for a current carrier to be conducted among polymer aggregate particles; and the nano-network conductive polymer has high current carrier mobility ratio, and can effectively connect surfaces among lithium iron phosphate particles when coated on the lithium iron phosphate surface to form an effective conductive network, so the lithium iron phosphate conductivity is significantly improved, and the contact resistance and electrode polarization among the particles are reduced to ensure that the electrochemical performance of an electrode material is greatly improved. The preparation method has a simple process and readily-available raw materials, and is suitable for carrying out industrial large-scale production.

The invention relates to an autonomous navigation and man-machine coordination catching operating system of a benthic organism catching robot, which comprises a catching robot, a computer used for carrying out comprehensive analysis processing and judgment on catching site and the state of the catching robot and used for providing remote intervention and management for catching management personnel in man-machine coordination catching operation, a mother ship used for carrying the management personnel and collecting and transporting catching objects, and a GPS (Global Positioning System) used for positioning the spatial location of the mother ship; information interaction is carried out between Agent in the catching robot and the mother ship on the water surface, and the actions of benthic walking, identification and space orientation of the catching objects, control catching and the like are autonomously finished. The autonomous navigation and man-machine coordination catching operating system of the benthic organism catching robot is simple in mechanism, low in control complexity, limited in intelligentization, high in catching efficiency, good in environmental suitability and low in manufacturing and maintenance costs, and can pointedly realize catching.

The invention provides a lithium ion battery negative electrode comprising a diamond-like thin film layer. The negative electrode comprises a conductive current collector, a negative electrode active material layer arranged on the conductive current collector and a diamond-like thin film layer deposited on the surface of the negative electrode active material layer; and the diamond-like thin film layer comprises doped elements, wherein the doped elements comprises one or more of Si, B, N, P, Al, Be, Mg, Ti, Cr, W, Fe, Zr, Pt, Mo, Co, Ni and Sb. According to the lithium ion battery negative electrode, the diamond-like thin film layer is deposited on the surface of the negative electrode active material layer, and the diamond-like thin film layer has excellent electrochemical inertness and conductivity and high mechanical strength, so that occurrence of an unstable SEI layer on the surface of the negative electrode active material is avoided, and the cycling stability of the electrode is greatly improved. The invention also provides a preparation method for the lithium ion battery negative electrode, and the lithium ion battery.