The invention discloses a coating method for a core-shell novel positive electrode material for a lithium ion battery. A uniform core-shell structure is formed by effective compounding two materials with electrochemical activity; and an effect for enhancing electrochemical performance of the materials is achieved by improving interface state of the materials and reducing side reactions. The coating method comprises the following steps of dispersing the positive electrode material for the lithium ion battery in deionized water and auxiliarily dispersing in a certain manner to obtain a slurry; dissolving a lithium source, an iron source, a phosphate radical source and a chelating agent in water; stirring for 1 hour at a room temperature to obtain a sol; adding the slurry obtained in the first step in the sol; adjusting a pH; then heating to a temperature of 80 DEG C; keeping the temperature for 1-12 h to form a gel; then drying the gel at a temperature of 100 DEG C; sintering the dry gel obtained by the former step for 1-10 hours at a temperature of 600-900 DEG C under the protection of nitrogen; and cooling to a room temperature naturally, so that the core-shell novel positive electrode material for the lithium ion battery is obtained.

Coating method for core-shell novel positive electrode material for lithium ion battery

The invention belongs to the technical field of lithium ion monomer batteries and particularly relates to a lithium ion monomer battery capable of preventing overdischarge. The lithium ion monomer battery capable of preventing overdischarge comprises an anode plate, a cathode plate, electrolyte and a diaphragm between the anode plate and the cathode plate. An anode active material comprises LiFe1-yMyPO4 in an olivine structure and lithium manganate in a layer structure, the lithium manganate in the layer structure accounts for 1-10% of the total mass of the anode active material, and the anode positive window of the battery relative to lithium is 3.85-2.2V when the battery is in use. Compared with the prior art, the lithium ion monomer battery capable of preventing overdischarge has the advantages that the LiFe1-yMyPO4 in the olivine structure has fine cycling performance, a discharge platform of the LiFe1-yMyPO4 in the olivine structure is about 3.45V, the lithium manganate in the layer structure has a discharge platform and part of capacity within the range of 3.0-1.5V, and the lithium ion monomer battery has the overdischarge preventing capacity when the lithium manganate in the layer structure and the LiFe1-yMyPO4 in the olivine structure are fittingly used as the anode active material.

Lithium ion monomer battery capable of preventing overdischarge

The invention relates to a defect-structure LiFePO4 surface-modification layer-spinel composite lithium-rich anode material. The stoichiometric equation of a surface-modification layer is Lil+zFel-2yP1-y-zTizO4-delta, wherein delta= 4-[(1-2y)*2+1+(1-y)*5]/2, y= 0.01-0.06; and z= 0.1-0.3. The stoichiometric equation of the layer-spinel composite lithium-rich anode material is Lix+0.5Mn0.75Ni0.25O0.5x+2 (x is larger than or equal to 0 but less than or equal to 0.5). The amount of substances of the surface-modification layer is 1-10 percent of the amount of the anode material. The surface-modification anode material has a high-cycle capacity holding ability and an excellent ratio characteristic.

Defect-structure LiFePO4 surface-modification layer-spinel composite lithium-rich anode material and preparation method thereof

The invention discloses a nano-structure lithium manganate/lithium iron phosphate/carbon three-dimensional composite spherical powder material and a preparation process thereof. The nano-structure lithium manganate/lithium iron phosphate/carbon three-dimensional composite spherical powder material mainly comprises nanometer-porous-structure lithium manganate, nanometer lithium iron phosphate and carbon three phase and is in a spherical shape, the grain diameter of the material is at a micrometer grade, the diameter of the primary particle is in nanoscale, and the nanometer lithium iron phosphate and carbon are uniformly deposited on the microspherical surface and/or in the pore of the nanometer porous structure lithium manganate. The preparation process comprises the following steps of adding manganese salt and sodium oxalate into a reactor, sufficiently stirring, and then calcining obtained spherical manganese oxalate in an inert atmosphere to obtain MnO2; then mixing MnO2 powder, lithium salt, iron salt, phosphate and a carbon source with corresponding weight in proportion, and sufficiently reacting to obtain a semi-finished product; and finally carrying out crystallization treatment in a nitrogen-hydrogen mixing atmosphere to obtain a finished product. The product disclosed by the invention can enhance the stability and the conductibility of a battery positive electrode material and improve the electrochemical property of the battery positive electrode material.

Nano-structure lithium manganate/lithium iron phosphate/carbon three-dimensional composite spherical powder material and preparation process thereof

The invention discloses a positive electrode active material and a preparation method therefor, battery paste, a positive electrode and a lithium battery The positive electrode active material has a core-shell structure; the core part is an active component with a structure of LiMn Fe PO /C, wherein x is greater than 0 and less than 1; the surface of the core part is coated with a shell layer; and the shell layer is a lithium iron phosphate compound material layer, wherein the outer surface of the lithium iron phosphate compound material layer is coated with a carbon layer According to the positive electrode active material, the lithium iron phosphate compound material layer is formed on the exterior of the active component with the structure of LiMn Fe PO /C, and the outer surface of the lithium iron phosphate compound material layer is coated with the carbon layer, so that the content of magnetic materials in the prepared positive electrode active material can be effectively lowered; and therefore, the problems of high probability of discharging of a negative electrode material and poor cycling performance in the use process of the battery can be relieved, and the service life of the battery is prolonged

Positive electrode active material and preparation method therefor, battery paste, positive electrode and lithium battery

The invention relates to a LiFePO4 coating LiMn2O4 composite electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery electrode materials and preparation thereof. In the invention, LiMn2O4 is used as a base body, the nanometer level of the LiFePO4 is coated on the surface thereof, and the amount of the LiFePO4 accounts for 5-25% of LiFePO4 and LiMn2O4 by weight percent. Combined with different advantages of LiMn2O4 materials and LiFePO4 materials, the LiMn2O4 is coated by the LiFePO4 so that the LiMn2O4 electrode material of the inner layer is separated from electrolytes, the reaction of the electrode and an electrolyte solution can be inhibited, the manganic solution loss is reduced, and the electrochemistry performance and the high temperature performance thereof are enhanced. Furthermore, because a LiFePO4 discharging platform is lower than the LiMn2O4, a ferromanganese iron battery can still discharge stably at the lower voltage and is not damaged, thereby improving the service performance of the battery and prolonging the service life of the battery. The invention has the advantages of simple preparation process, favorable coating effect, convenient operation and easy implementation of mass industrial production; and the obtained composite electrode material has excellent electrochemistry temperature performance and anti-overcharge performance.

LiFePO4 coating LiMn2O4 composite electrode material and preparation method thereof

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LiFePO4 coating LiMn2O4 composite electrode material and preparation method thereof