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CN-121976299-A - Preparation method of monocrystalline manganese oxide-based lithium manganate material

CN121976299ACN 121976299 ACN121976299 ACN 121976299ACN-121976299-A

Abstract

The invention relates to the technical field of lithium ion battery anode materials, in particular to a preparation method of a monocrystal manganese sesquioxide-based lithium manganate material, which comprises the steps of taking monocrystal manganese sesquioxide with the D50 of 3-8 mu m as a manganese source and lithium carbonate with the D50 of 4-7 mu m as a lithium source, doping nanoscale metal oxides, controlling the proportion of lithium to manganese to be 1.06-1.1:1 and the addition amount of metal elements to be 0.1% -1%, mixing raw materials by an inclined mixer for 60-120min (the rotating speed of 30-50 rpm), sintering the raw materials in a roller kiln after the raw materials are qualified (heating for 2-3h, keeping the constant temperature for 6-15h/650-850 ℃ and cooling for 4-6h, introducing air for 50-200m 3 /h), crushing, sieving and removing iron to obtain a product.

Inventors

  • LI JIAJUN
  • GU KEFENG
  • DENG YAFENG

Assignees

  • 无锡晶石新型能源股份有限公司

Dates

Publication Date
20260505
Application Date
20260203

Claims (7)

  1. 1. The preparation method of the monocrystalline manganese oxide-based lithium manganate material is characterized by comprising the following steps of: step1, preparing raw materials, namely taking monocrystalline manganese sesquioxide as a manganese source, taking lithium carbonate as a lithium source, doping nanoscale metal oxide, controlling the molar ratio of lithium to manganese to be 1.06-1.1:1, and controlling the addition amount of the metal elements to be 0.1% -1% of the theoretical product mass; step 2, mixing the raw materials in the step 1 uniformly to obtain mixed raw materials; step 3, sintering, namely placing the mixed raw material into a roller hearth furnace, and introducing air to perform sintering treatment of heating, constant temperature and cooling; and 4, post-treatment, namely crushing, sieving and deironing the sintered material in sequence to obtain the monocrystalline manganese oxide-based lithium manganate material.
  2. 2. The method for producing a single crystal manganese sesquioxide-based lithium manganate material according to claim 1, wherein in step 1, the particles D50 of the single crystal manganese sesquioxide are 3 to 8 μm and the particles D50 of the lithium carbonate are 4 to 7 μm.
  3. 3. The method for preparing a single crystal manganese sesquioxide-based lithium manganate material according to claim 1, wherein in the step 1, the nano-scale metal oxide is at least one corresponding oxide of aluminum, titanium, magnesium, zirconium and niobium.
  4. 4. The method for preparing a single crystal manganese sesquioxide-based lithium manganate material according to claim 1, wherein in the step 2, a bevel mixer is adopted for mixing, the rotating speed of the bevel mixer is 30-50rpm, and the mixing time is 60-120min.
  5. 5. The method for preparing a single crystal manganese sesquioxide-based lithium manganate material according to claim 4, wherein in the step 2, the lithium content of the mixed raw material is detected after the mixing is finished, and if the lithium content is not qualified, the supplementary mixing is continued until the lithium content is qualified.
  6. 6. The method for preparing a single crystal manganese sesquioxide-based lithium manganate material according to claim 1, wherein in the step 3, the heating time is 2-3 hours, the constant temperature is 650-850 ℃, the constant temperature time is 6-15 hours, and the cooling time is 4-6 hours.
  7. 7. The method for producing a single crystal manganese sesquioxide-based lithium manganate material according to claim 1, wherein in the step 3, the air is introduced in an amount of 50-200m 3 /h.

Description

Preparation method of monocrystalline manganese oxide-based lithium manganate material Technical Field The invention relates to the technical field of lithium ion battery anode materials, in particular to a preparation method of a monocrystalline manganese oxide-based lithium manganate material. Background Lithium ion batteries are popularized worldwide as new energy industries, lithium manganate is used as a positive electrode material of the lithium ion batteries, is always the key point and development direction of research in the industry, is widely applied to the fields of digital products, electric tools, electric vehicles and electric vehicles, and has higher cost performance and lower cost compared with materials such as lithium iron phosphate, lithium nickel cobalt manganate and the like. The traditional lithium manganate production comprises the working procedures of compounding, sintering, crushing, sieving, iron removal, packaging and the like, wherein raw materials used in the compounding working procedure mainly comprise a manganese source and a lithium source, the manganese source is a key which directly influences the performance of a lithium manganate material, and the manganese source selected in the traditional lithium manganate preparation is electrolytic manganese dioxide or manganous oxide. The lithium manganate material prepared by adopting the manganese dioxide has high impurity content, potential safety hazard to later-stage cell manufacturing, high raw material price, low manganese content and higher comprehensive cost, the lithium manganate material prepared by adopting the manganic manganate has poor high-temperature performance and cycle performance and lower compaction density, and a certain amount of oxygen is required to be absorbed during high-temperature sintering synthesis in the preparation process, so that the sintering pot loading amount is lower and the yield is insufficient, and therefore, aiming at the current situation, the development of a preparation method of the monocrystal manganese sesquioxide-based lithium manganate material is urgently needed to overcome the defects in the current practical application. Disclosure of Invention The invention aims to provide a preparation method of a monocrystalline manganese oxide-based lithium manganate material, which aims to solve the problems in the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: a preparation method of a monocrystal manganese oxide-based lithium manganate material comprises the following steps: step1, preparing raw materials, namely taking monocrystalline manganese sesquioxide as a manganese source, taking lithium carbonate as a lithium source, doping nanoscale metal oxide, controlling the molar ratio of lithium to manganese to be 1.06-1.1:1, and controlling the addition amount of the metal elements to be 0.1% -1% of the theoretical product mass; step 2, mixing the raw materials in the step 1 uniformly to obtain mixed raw materials; step 3, sintering, namely placing the mixed raw material into a roller hearth furnace, and introducing air to perform sintering treatment of heating, constant temperature and cooling; and 4, post-treatment, namely crushing, sieving and deironing the sintered material in sequence to obtain the monocrystalline manganese oxide-based lithium manganate material. As a further aspect of the present invention, in step 1, the particles D50 of the single crystal manganese sesquioxide are 3 to 8 μm and the particles D50 of the lithium carbonate are 4 to 7. Mu.m. In a further scheme of the invention, in the step 1, the nanoscale metal oxide is at least one oxide corresponding to aluminum, titanium, magnesium, zirconium and niobium. In the step 2, a bevel mixer is adopted to mix materials, the rotating speed of the bevel mixer is 30-50rpm, and the mixing time is 60-120min. In the step 2, detecting the lithium content of the mixed raw material after the mixing is finished, and if the lithium content is unqualified, continuing to carry out the supplementary mixing until the lithium content is qualified. In the step 3, the heating time is 2-3h, the constant temperature is 650-850 ℃, the constant temperature time is 6-15h, and the cooling time is 4-6h. As a further scheme of the invention, in the step 3, the air inflow is 50-200m 3/h. Compared with the prior art, the invention has the beneficial effects that: According to the invention, the monocrystal manganese sesquioxide is selected as a manganese source to prepare the lithium manganate material, and compared with electrolytic manganese dioxide used in the traditional scheme, the monocrystal manganese sesquioxide is lower in raw material price and higher in manganese content; meanwhile, the manganese source does not need to additionally increase the process cost due to high oxygen consumption in sintering like the trimanganese tetroxide, and based on the techni