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A positive electrode material coated and modified by doping metal oxide and its preparation method

A positive electrode material and oxide technology, which is applied in the field of doped metal oxide-coated and modified positive electrode materials and its preparation, can solve the problems of poor cycle stability improvement, poor cycle stability, and low ionic conductivity. Achieve the effects of uniform coating, low cost, high electronic conductivity and cycle stability

Active Publication Date: 2018-09-07
北京盟固利新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

LiNi 0.5 mn 1.5 o 4 The main defects of the material itself include that it is easily decomposed by the electrolyte at high potential, causing the dissolution of metal ions, resulting in poor cycle stability and rapid capacity decay. In addition, its low ionic conductivity also affects its rate performance. Key factor
[0004] At present, research work has been devoted to the LiNi 0.5 mn 1.5 o 4 Surface modification of materials, such as Chinese patent CN201410224928, uses a solution method to coat a conductive polymer on the surface of lithium nickel manganese oxide material to improve the electrochemical performance of lithium nickel manganese oxide, although the initial discharge capacity of the positive electrode material obtained by this method is increased to 120mAhg -1 , but the cycle stability is still poor, and the discharge capacity drops to 115mAhg after 60 cycles -1 , the capacity retention rate is only 95.8%; another example is the Chinese patent CN201310099428, which uses the in-situ surface coating method to prepare Li 2 MnO 3 Coated LiNi 0.5 mn 1.5 o 4 Cathode material, its initial discharge capacity can reach 140mAhg -1 or so, but the cycle stability is still poor, and the capacity retention rate after 50 cycles is only about 92%
[0005] To sum up, currently in the LiNi 0.5 mn 1.5 o 4 In the research field of material modification, the effect of improving its cycle stability is poor, and it is still difficult to achieve a significant increase in cycle stability while improving the rate performance

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  • A positive electrode material coated and modified by doping metal oxide and its preparation method
  • A positive electrode material coated and modified by doping metal oxide and its preparation method
  • A positive electrode material coated and modified by doping metal oxide and its preparation method

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preparation example Construction

[0040] According to the second aspect of the present invention, there is provided a method for preparing the positive electrode material as described above, which uses the co-precipitation method to coat and modify the matrix, specifically including the following steps:

[0041] Step 1), the preparation of matrix

[0042] Adding nickel source, manganese source and lithium source into the solvent, stirring evenly, removing the solvent, then calcining at high temperature, quenching treatment, crushing and sieving to obtain the matrix.

[0043] In a preferred embodiment of the present invention, the nickel source, the manganese source, and the lithium source are mixed according to the element molar ratio Ni:Mn:Li=(0.1~1.8):(0.2~1.9):1, and stirred for 10~60 Minutes, slowly evaporate to dryness at 60-90°C, move to 110-130°C oven for drying, then calcinate at 600-1200°C for 8-16 hours, then quench at 500-900°C for 6-10 hours, and finally crush and sieving to obtain the matrix.

...

Embodiment 1

[0060] Example 1 Preparation of matrix

[0061] Add nickel acetate, manganese carbonate, and lithium carbonate to absolute ethanol in sequence according to the molar ratio of elements Ni:Mn:Li=1:3:2.05, stir for 30 minutes, place in an 80°C oil bath and slowly evaporate to dryness, and move to 120 ℃ oven drying, calcined at 900 ℃ for 12 hours, and finally quenched at 700 ℃ for 8 hours, ball milled for 3 hours and then sieved to obtain a matrix of micro-nanosphere structure.

[0062] The structure was observed by transmission electron microscopy, and the results were as follows: figure 1 As shown in the left figure, the average particle size of the matrix is ​​about 600nm.

[0063] The cycle performance was measured at 1C rate, the results are as follows image 3 As shown, the initial discharge capacity of the substrate is 100.7mAh·g -1 , after 200 cycles of constant current charging and discharging, the discharge capacity drops to 79.6mAh·g -1 , the capacity retention rate...

Embodiment 2

[0069] Example 2 Preparation of Aluminum-doped Zinc Oxide Coated Modified Positive Electrode Material

[0070] According to the ratio that aluminum-doped zinc oxide accounts for 5% of the mass of the positive electrode material after coating and Al accounts for 5% of the molar weight of Zn, zinc nitrate, aluminum nitrate and the matrix obtained in Example 1 are added to absolute ethanol, stirred for 30 minutes, and drying in an oven at 60°C, and finally calcining at 500°C for 5 hours to obtain a modified positive electrode material coated with aluminum-doped zinc oxide.

[0071] The structure was observed by transmission electron microscopy, and the results were as follows: figure 1 As shown in the right figure, the surface of the substrate is coated with a coating layer with a thickness of about 4nm.

[0072] EDS elemental analysis was carried out on it, and the results were as follows figure 2 and as shown in Table 2:

[0073] Table 2. EDS elemental analysis results of a...

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Abstract

The invention discloses a wrapped and modified anode material doped with metallic oxide and a preparation method of the anode material. The anode material comprises a base body and a wrapping layer wrapping the base body. The base body is LiNixMn<2-x>O<4>. The wrapping layer is zinc oxide doped with R elements, the R is one or more of Al, Ga and In, and the anode material is prepared through a coprecipitation method. The wrapped and modified anode material doped with metallic oxide has higher electronic conductivity and cycling stability, the surface is evenly and totally wrapped, and the preparation method is simple, controllable, los in cost and applicable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for batteries, and in particular relates to a positive electrode material coated and modified by doping metal oxides and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in many fields. In lithium-ion batteries, the cathode material occupies an important position, and its performance directly determines the performance indicators of the final battery product. In recent years, with the continuous development of lithium-ion batteries to high energy density With the development of the direction, the requirements for the mass specific capacity and volume specific capacity of the positive electrode material powder are also getting higher and higher. [0003] The currently widely used positive electrode material is LiCoO with a layered structure. 2 , LiFePO with olivine structure 4 and spinel-structured LiMn 2 o 4 Wait. However, thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 罗海峰朱晓沛江卫军吴剑文蔡硕文博戴丽琴苏迎春张溪
Owner 北京盟固利新材料科技有限公司
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