TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The cathode material uses artificial graphite, natural graphite, intermediate phase microballoon and/or hard carbon material. Preferred Process: The battery cast is made from aluminum-plastic film by punching; the battery core is a laminated electrical core composed by laminating two electrical cores.    TECHNOLOGY FOCUS - POLYMERS - Preparation: The preparation method of polymer lithium iron phosphate power battery having large capacity and high power comprises (a) preparation of slurry: preparing anodal slurry with N-methyl pyrrollidone as solvent; the proportion by weight of used materials comprises 81%-85% of lithium iron phosphate, 1-5.5% of superconductive carbon, 0-2.5% of graphitized carbon black, 0-4% of conductive graphite, 0-2.5% of crystalline flake graphite, 0-2% of carbon nanotube, 6%-7.5% of polyvinylidene fluoride; the conductive agent uses conductive carbon black, superconductive carbon, conductive graphite, crystalline flake graphite and/or carbon nanotube; the solid contents of slurry is 35%-45%; firstly, adding polyvinylidene fluoride into N-methyl pyrrollidone according to the solid content of slurry and proportion; vacuum stirring for 2-4 hours when stirring cold water; and then adding the mixture of lithium iron phosphate and conductive agent equally mixed in batches; adding the mixture for three times, adding every other one hour and then stirring for 3-5 hours after final stirring to obtain the slurry, sieving the slurry for 2-3 times with 150 meshes; preparing the anodal slurry with de-ionized water as medium; the proportion by weight of the used materials comprises 98%-91% of cathode materials, 1-3.5% of superconductive carbon, 0-2% of graphitized carbon black, 0-4% of conductive graphite, 2.5%-3.5% of styrene-butadiene rubber and 1.5%-2% of sodium carboxymethyl cellulose; where the cathode material uses artificial graphite, natural graphite, intermediate phase microballoon and/or hard carbon material; the solid content is 30%-50%; firstly, adding the polyvinylidene fluoride into the de-ionized water according to the solid content of slurry and proportion; stirring for 1-3 hours; adding conductive agent to stir for 2-4 hours; grinding the slurry colloid to make the conductive agent fully disperse; then adding cathode materials to stir for 2-5 hours; then adding styrene-butadiene rubber to stir for 2-3 hours to obtain the slurry to sieve for 2-3 times in 150 meshes; (b) anode and cathode coating: coating with the rolling slit-type coating; preserving the sites according to needs of design; the thickness of anodal slurry coating is the aluminum foil of 16-30 mu m; the density of coating surface is 6-16 mg/cm2; the roast temperature of anode coating oven is 90-120 degrees C; the anodal coating speed is controlled to 1.5-2 m/minute; the cathode slurry coating uses the electrolytic copper foil having a cathode collection fluid thickness of 10-20 mu m; the density of coated surface is 2.5-7 mg/cm2; the roasting temperature of cathode coated oven is 80-100 degrees C; the cathode coating speed is 3-5 m/minute; (c) pole shoe rolling: the anodal compacted density is 1.5-2.5 g/cm3 and the cathode compacted density is 1.2-1.6 g/cm2; (d) pole shoe transversely cutting and cutting: transversely cutting and cutting the rolled pole shoes based on the standard of battery pole shoe; (e) pole shoe roasting: roasting pole shoe under vacuum state; roasting the anodal pole shoe at 110-130 degrees C; roasting cathode pole shoe at 80-100 degrees C for 12 hours; continuously sucking or discharging argon for three times every four hours when roasting; discharging argon for 3 times after roasting; then cooling the pole shoe to 40 degrees C under vacuum state; taking out the pole shoe for subsequent procedures; (f) anodal and cathode ear welding: welding the anodal and cathode ears to the anodal and cathode pole shoe according to the battery design; anodal and cathode ear welding uses ultrasonic welding, avoiding ear rosin welding; (g) preparation of battery core: electric core comprises anode, cathode and membrane between the anode and cathode; the electrical core uses membrane/cathode/membrane/anode coiled structure; the thickness of membrane is 12-30 mu m and the electrical core is a laminated electrical core made by laminating two electrical cores; (h) casing and encapsulating electrical corer: filling the laminated electrical core into the charged battery case; thermally encapsulating the battery top and one side by the encapsulation machine for 5-10 seconds at 150-250 degrees C under 0.2-0.5 MPa; (i) roasting electrical core: roasting the electrical core under vacuum state for 24 hours at 80-120 degrees C; continuously discharging argon for 3 times every 6 hours during the process of roasting; continuously discharging argon for 3 times after roasting; then cooling the pole shoe under vacuum state to below 40 degrees C and taking out the electrical core to inject; (j) battery injection: injecting gel electrolyte into the battery equipped with an electrical core; and then thermal encapsulating the other side of the battery; the gel electrolyte carries out polymerization of thermal initiation for 2-30 minutes at 60-120 degrees C under 0.5 KPa-2.5 MPa; placing the battery for 24 hours; welding anodal ear and cathode ear with aluminum strip and nickel strip before formation of battery; (k) formation of battery and departing capacity: forming at a limited time and the formation technical is 0.05 C charging for 1 hour+0.1 C charging for 4 hours+0.2C charging for 3 hours; and then discharging gas, thermal encapsulating, cutting edge and shaping; the capacity departing technical of battery is to use 0.5 C constant flow to charge to 4V and then charge under constant flow of 4V; the cut-off current is 0.01 C; then discharge to 2.5 V from 0.5 C; the capacity discharged from the battery is the battery capacity and then charge the battery to 3.6 V from 0.5 C, then charge under 3.6 V and constant current; the cut-off current is 0.01 C and all chemical performance indexes can enter the warehouse if reaching at the requirements after departing capacity of battery.