Metallic oxide-coated modified doped ternary anode material and preparation method thereof

A cathode material and oxide technology, applied in the field of metal oxide coating modified doped ternary cathode material and its preparation field, can solve the problems such as cycle stability to be improved, electrochemical performance deterioration, capacity retention rate decline and the like , to achieve excellent rate performance and cycle stability, improve cycle stability, and reduce the effect of decomposition

Active Publication Date: 2015-12-02
北京盟固利新材料科技有限公司
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Problems solved by technology

[0002] In the field of lithium-ion cathode materials, nickel-rich cathode materials (LiNi x m 1-x o 2 , M=Mn, Co, Al, x>0.5) has high energy density, long cycle life and good safety performance, and has been widely concerned. Among them, LiNi x mn y co 1-x-y o 2 The layered ternary cathode material has the synergistic effect of three ions of Ni, Mn and Co, so it has better electrical properties, but its cycle stability and rate performance need to be improved. In addition, the three kinds of Ni, Mn and Co in the material The ratio of elements has an important influence on its electrochemical performance, and the material is LiNi 0.5 mn 0.3 co 0.2 o 2 Convert to LiNi 0.6 mn 0.2 co 0.2 o 2 , its electrochemical

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  • Metallic oxide-coated modified doped ternary anode material and preparation method thereof
  • Metallic oxide-coated modified doped ternary anode material and preparation method thereof
  • Metallic oxide-coated modified doped ternary anode material and preparation method thereof

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Example Embodiment

[0042] According to the second aspect of the present invention, there is provided a method for preparing the positive electrode material as described above, which specifically includes the following steps:

[0043] Step 1), preparation of substrate

[0044] The nickel-cobalt-manganese ternary precursor, the lithium source and the strontium source are mixed, calcined at a high temperature, pulverized and sieved to obtain the matrix.

[0045] In a preferred embodiment according to the present invention, the nickel-cobalt-manganese ternary precursor, the lithium source and the strontium source are respectively passed through a 100-300 mesh sieve and then mixed with a molar ratio of 1:(1~1.06):(0~0.005). , Calcining in air atmosphere for 3-40 hours, preferably 5-36 hours, during which the calcination temperature is increased from 200℃ to 1000℃, the heating rate is 5℃ / min, then it is reduced to room temperature, after pulverization, 100-300 Mesh sieve to obtain the matrix.

[0046] In the...

Example Embodiment

[0062] Example 1 Preparation of Sr-doped lithium nickel cobalt manganate matrix

[0063] Weigh 84.4 g of lithium carbonate, 200 g of nickel cobalt manganese hydroxide, and 1.08 g of strontium carbonate, and add them to a 200-mesh sieve in sequence, and mix them evenly after sieving;

[0064] Put the sieved above-mentioned materials into a crucible and calcinate for 36 hours in an air atmosphere in the muffle furnace. During this time, the calcining temperature will be increased from 200℃ to 1000℃, the heating rate will be 5℃ / min, and then it will naturally drop to room temperature. , After being pulverized by a ball mill for 3 hours, passing through a 200-mesh sieve to obtain the matrix Li(Ni 0.5 Mn 0.3 Co 0.2 ) 1-x Sr x O 2 , Where x = 0.003.

Example Embodiment

[0065] Example 20.01% Al 2 O 3 Preparation of Coated Modified Doped Ternary Cathode Material

[0066] Weigh 0.06g of lithium carbonate, add it to a beaker containing 120mL of ultrapure water, stir under heating, wait until the temperature rises to above 50℃, weigh 120g of the substrate prepared in step 1) and add it to the above solution, keep stirring and Heat the solution to 80°C to obtain mixed solution A;

[0067] Weigh 0.167 g of aluminum nitrate nonahydrate and add it to a beaker containing 30 mL of ultrapure water, stir to dissolve, and add it to the mixed solution A by a constant flow pump at a flow rate of 10 mL / min. After the addition is complete, the solution is heated to 80°C, keep stirring and react for 1-2 hours;

[0068] The solution after completion of the above reaction was filtered, the filtered insoluble matter was dried in an oven at 150°C, passed through a 300-mesh sieve, and then put into a porcelain boat, calcined in a muffle furnace at 550°C for 5 hours, and ...

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Abstract

The invention discloses a metallic oxide-coated modified doped ternary anode material and a preparation method thereof. The anode material is represented by Li (Ni0.5Mn0.3Co0.2)(1-x)SrxO2.mAl2O3, and comprises a substrate and a coating layer coating the outer part of the substrate, wherein the substrate is represented by Li(Ni0.5Mn0.3Co0.2)(1-x)SrxO2; the coating layer is Al2O3. The anode material is prepared through combining the solid phase method with the heterogeneous nucleation method. The metallic oxide-coated modified doped ternary anode material provided by the invention has higher electronic conductivity and cycling stability, the surface is uniformly and completely coated, and the preparation method is easy, controllable, low in cost and suitable 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 metal oxide-coated and modified doped ternary positive electrode material and a preparation method thereof. Background technique [0002] In the field of lithium-ion cathode materials, nickel-rich cathode materials (LiNi x m 1-x o 2 , M=Mn, Co, Al, x>0.5) has high energy density, long cycle life and good safety performance, and has been widely concerned. Among them, LiNi x mn y co 1-x-y o 2 The layered ternary cathode material has the synergistic effect of three ions of Ni, Mn and Co, so it has better electrical properties, but its cycle stability and rate performance need to be improved. In addition, the three kinds of Ni, Mn and Co in the material The ratio of elements has an important influence on its electrochemical performance, and the material is LiNi 0.5 mn 0.3 co 0.2 o 2 Convert to LiNi 0.6 mn 0.2 co 0.2 o 2 When , i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/505H01M4/525H01M4/1391B82Y30/00
CPCB82Y30/00H01M4/1391H01M4/36H01M4/505H01M4/525H01M4/62Y02E60/10
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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