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Lithium manganese iron phosphate (LiMnxFe1-xPO4, LMFP) is a new type of phosphate lithium-ion battery cathode material formed by doping a certain percentage of manganese (Mn) on the basis of lithium iron phosphate (LiFePO4, LFP), which is regarded as the "upgraded version of lithium iron phosphate". The doping of manganese element can make the advantageous features of both iron and manganese elements can be effectively combined, and manganese and iron are located in the fourth period of the periodic table and adjacent to each other, with similar ionic radius and some chemical properties, so the doping will not significantly affect the original structure. Compared with lithium iron phosphate High voltage: The charging voltage is increased from 3.4V to 4.1V for lithium iron phosphate. High energy density: Theoretical 15-20% increase in battery energy density, providing longer range, LFP has reached the upper limit. Low temperature performance improvement: LMFP has a capacity retention rate of 76% at -20°C, compared to 60-70% for LFP. Compared to ternary cathode materials Improved safety: LFP and LMFP are both olivine shaped structure, which is more stable than the layer oxide structure of ternary batteries. LFP and LMFP have olivine structure, which is more stable and safer than ternary batteries. Email: tob.amy@tobmachine.com Skype: amywangbest86 Whatsapp/Phone number: +86 181 2071 5609

1.Determination of iron content in anode graphite   The sample to be measured was dissolved under the condition of heating (1+1) HCl solution, and then the concentration of iron content in the sample to be measured was measured by atomic absorption spectrophotometer standard curve method.   Apparatus: Atomic absorption spectrometer, analytical balance, electric furnace, 250mL volumetric flask, 100mL volumetric flask, beaker, glass rod, funnel   Reagent: AR (1+1) hydrochloric acid   （1）Prepare standard solutions of Fe, 0 ppm, 0.5 ppm, 1 ppm and 1.5 ppm. （2）About 5 g of graphite was weighed in a 150 mL beaker in an analytical balance, 80 mL (1+1) of HCl was added and heated on a heating plate for about 30 min; the heated sample was cooled and filtered, fixed into a 100 mL volumetric flask, and the iron content was measured by atomic absorption spectrometry. （3）Turn on the computer→Open the instrument→Enter the working software→System reset (reset once per power on)→Tap OK after the reset is completed→Element selection→Condition setting→Wavelength positioning→Automatic energy to about 100%. （4）Open the air valve, adjust the output pressure 0.2~0.3MPa, then open the acetylene valve, adjust the pressure to 0.05~0.1MPa, press the host acetylene switch, adjust the acetylene switch to make the acetylene flow to the scale line, and ignite immediately. （5）The testing sequence is specimen blank→specimen blank→sample blank→sample test. Calculation：         2.Test method for particle size of negative graphite In the propagation of light, the wave source is restricted by the gap or particle of the same wavelength scale, and the emission of each element wave at the restricted source interferes in space to produce diffraction and scattering, and the spatial (angular) distribution of the diffracted and scattered light energy is related to the wavelength of the light wave and the scale of the gap or particle. With laser as the light source, the light is monochromatic with a certain wavelength, and the spatial (angular) distribution of diffracted and scattered light energy is only related to the particle size. For the diffraction of the particle group, the amount of each particle level determines the size of the light energy obtained at each specific angle, and the proportion of each specific angle light energy in the total light energy should reflect the distribution abundance of each particle level.   Instruments:laser particle size analyzer, ultrasonic cleaning machine, glass rod, beaker Reagent: Glycerol solution （1）Check whether the instrument power supply and water source are well connected. Turn on the power of the host (preheat for 30 minutes), then turn on the computer in turn to enter the instrument operation interface and turn on the water source. （2）Configure the dispersant: add a few drops of propanetriol to a 150mL beaker, dilute to 50mL with water, and mix well. （3）Sample preparation: add an appropria...

Internal resistance is one of the important indicators to evaluate the performance of lithium batteries. The test of internal resistance includes AC internal resistance and DC internal resistance. For single cell batteries, the AC internal resistance is generally evaluated as AC internal resistance, which is usually called ohmic internal resistance.  However, for large battery pack applications, such as power supply systems for electric vehicles, due to the limitations of test equipment and other aspects, it is not possible or convenient to directly test the AC internal resistance, and the characteristics of the battery pack are generally evaluated by DC internal resistance. In practical applications, DC internal resistance is also mostly used to evaluate the health of the battery, to make life prediction, and to make estimation of system SOC, output/input capacity, etc. In production, it can be used to detect phenomena such as faulty cells such as micro-short circuits.   The principle of DC internal resistance testing is to calculate the DC internal resistance of a battery by applying a high current (charging or discharging) to the battery or battery pack for a short period of time, before the battery has reached full internal polarization, based on the voltage change of the battery before and after the applied current and the applied current. Four parameters must be selected to test the DC internal resistance: current (or adopted multiplier), pulse time, state of charge (SOC), and test environment temperature. The variation of these parameters has a large impact on the DC internal resistance.   DC internal resistance not only includes the ohmic internal resistance part of the battery pack (AC internal resistance part), but also partly includes some polarization resistance of the battery pack. And the polarization of the battery is more influenced by the current, time and so on.   At present, the commonly used DC internal resistance test methods are the following three.   (1) HPPC test method in the U.S.《Freedom CAR Battery Test Manual》: the test duration is 10s, the applied discharge current is 5C or higher, and the charging current is 0.75 of the discharge current. the specific current selection is based on the characteristics of the battery to develop.   (2) Japanese JEVSD713 2003 test method, originally mainly for Ni/MH batteries, later also applied to lithium-ion batteries, first establish the current-voltage characteristic curve of the battery under 0~100% SOC, alternately charge or discharge the battery under the set SOC with the current of 1C, 2C, 5C, 10C, respectively, the charging or discharging time is 10s, and calculate the DC internal resistance of the battery. The DC internal resistance of the battery is calculated.   (3) The test method proposed in the "High Power Lithium-ion Power Battery Performance Test Specification for HEV" of China's "863" program, the test duration is 5s, the charging...

Power lithium batteries have been widely used in electric vehicles and energy storage systems due to their high energy density and long service life. However, the welding process of power lithium batteries is still a key factor affecting their performance and safety. Laser welding technology has become an important method for the manufacturing of power lithium batteries due to its high precision, fast welding speed, and good weld quality. Laser welding technology for power lithium batteries mainly includes two types: solid-state laser welding and fiber laser welding. Solid-state laser welding is suitable for welding thin materials and is widely used in the welding of battery cells, while fiber laser welding is suitable for welding thicker materials and is mainly used in the welding of battery modules. The welding process of power lithium batteries mainly includes material preparation, welding process optimization, and welding quality control. Before welding, the surface of the battery material must be cleaned to ensure a good welding effect. The welding process should be optimized according to the material properties and welding requirements, such as beam quality, welding speed, and energy distribution. During welding quality control, the welding seam should be inspected for defects such as porosity, cracks, and voids, and non-destructive testing should be carried out to ensure the welding quality. In conclusion, laser welding technology is a promising method for the production of power lithium batteries. It has the advantages of high precision, fast welding speed, and good weld quality, which can significantly improve the performance and safety of power lithium batteries. With the development of laser technology, the application of laser welding technology in power lithium batteries will become more widespread in the future.

TOB New Energy provides large batch order of the lithium-ion battery, sodium ion battery and supercapacitor cathode and anode materials: TOB NEW ENERGY provides batch order of cathode materials for lithium ion battery. NO. Item Product Name Model 1 LFP Cathode Materials Lithium iron phosphate Powder TOB-LFP-01 2 Lithium iron phosphate Powder TOB-LFP-02 3 Lithium iron phosphate Powder TOB-LFP-03 4 NMC Cathode Materials Lithium Nickel Manganese Cobalt 811 TOB-NMC-811 5 Lithium Nickel Manganese Cobalt 622 TOB-NMC-622 6 Lithium Nickel Manganese Cobalt 532 TOB-NMC-532 7 Lithium Nickel Manganese Cobalt 111 TOB-NMC-111 8 NCA Cathode Materials Lithium Nickel Cobalt Aluminum TOB-NCA 9 LMNO Cathode Materials LiNi0.5Mn1.5O4 Cathode Powder TOB-LNMO-1 10 LCO Cathode Materials Lithium cobalt oxide TOB-LCO 11 LMO Cathode Materials Lithium Manganese Dioxide TOB-LMO 12 Lithium-Rich Materials Lithium-Rich Manganese-Based Layered Oxide TOB-Li-rich 13 LMFP Cathode Powder Lithium Manganese Iron Phosphate TOB-LMFP TOB NEW ENERGY provides batch order of anode materials for lithium ion battery. NO. Item Product Name Model 1 Graphite Anode Natural Graphite Powder TOB-Graphite-T 2 High Rate High Capacity Artificial Graphite Powder TOB-Graphite-R 3 Artificial Graphite TOB-Graphite-R 4 MCMB Anode Mesocarbon Microbeads TOB-MCMB-S 5 Lithium Titanate Oxide Anode Carbon-coated LTO Anode Black Powder TOB-LTO-B 6 LTO Anode Powder TOB-LTO-W 7 Silicon Anode Different Particle Size Green Silicon Carbide TOB-SiC-Green 8 Carbon Coated Silicon TOB-S400A 9 Hard Carbon Anode Irregular Hard Carbon Powder TOB-Na-HC01 10 5μm Spherical Hard Carbon Powder TOB-Na-HC02

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