Positive electrode active material, preparation method, positive electrode and battery
A cathode active material, cathode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of material erosion, harsh environmental requirements, material poisoning, etc., to reduce side reactions, excellent chemical corrosion resistance, and improve electrical conductivity. Effect
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[0028] The present application also provides a method for preparing a positive electrode active material, wherein the method includes:
[0029] S1, the LiMBO 3 , carbon source and molybdenum source are mixed according to the mass ratio of 80-94:6.5-51.5:4.7-26, and sintered under an inert atmosphere to obtain LiMBO 3 / C+Mo 2 C positive electrode active material; wherein, M is selected from one or more of Mn, Fe, Co.
[0030] Preferably, the high-temperature sintering temperature is 700-900°C, and the sintering time is 2-48h; the inert atmosphere is one of helium, neon or argon; the carbon source is selected from sucrose, glucose, epoxy resin One or more of polyvinyl alcohol and phenolic resin.
[0031] In the above preparation method, the intermediate material LiMBO 3 (wherein, M is selected from one or more of Mn, Fe, Co) mixed with molybdenum source and carbon source and sintered to generate carbon and Mo 2 During the C coating process, the carbon source is first carbon...
Embodiment approach
[0058] Wherein, the separator can be selected from various separators used in batteries known to those skilled in the art, such as polyolefin microporous membrane (PP), polyethylene felt (PE), glass fiber felt or ultrafine glass fiber paper or PP / PE / PP. As a preferred embodiment, the separator is PP / PE / PP.
[0059] The preparation method of the battery provided by the present invention can be a method known to those skilled in the art. Generally speaking, the method includes winding the positive electrode, the negative electrode and the separator between the positive electrode and the negative electrode in sequence to form a pole core, and the pole core Put into the battery case, add electrolyte, and then seal, wherein, the methods of winding and sealing are well known to those skilled in the art. The amount of electrolyte used is conventional. The electrolyte can also be replaced by one of all solid electrolytes, solid electrolytes or gel electrolytes.
[0060] Unless oth...
Embodiment 1
[0063] Preparation of positive electrode active material:
[0064] FeC 2 o 4 2H 2 O and LiBO 2 Mix according to the molar ratio of 1:1, place in a stirring ball mill for mixing and grinding for 8 hours; place the precursor prepared by fully mixing and grinding in a corundum crucible; put the crucible in a tube furnace, blow in nitrogen, and start heating from room temperature, The heating rate is 5°C / min, the temperature is raised to 750°C for 15 hours, and then naturally cooled to room temperature to obtain LiFeBO 3 Material. LiFeBO 3 、MoO 3 Mix with glucose at a mass ratio of 70:28.2:85.3, place in a stirring ball mill, add ethanol, and wet mix and grind for 6 hours; dry the precursor prepared by fully mixing and grinding and place it in a corundum crucible; put the crucible into a tubular In the furnace, Ar gas was introduced, heating was started from room temperature, the heating rate was 5°C / min, the temperature was raised to 700°C for 48h, and then naturally coole...
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