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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 performance deteriorates sharply, therefore, it is very important to choose the appropriate ratio
[0003] Surface modification of positive electrode materials with oxides that are not electrochemically active can improve their electrochemical performance. For example, the patent CN201310020961 uses Al 2 o 3 Coated modified LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , during the preparation process, a precipitant and a shape control machine are added to control the particle formation, and the discharge capacity and cycle stability of the positive electrode material are improved, but the degree of improvement is limited, and the capacity remains constant after 6 cycles of constant current charge and discharge. rate dropped significantly

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

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preparation example Construction

[0042] According to a 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), the preparation of matrix

[0044] The matrix is ​​obtained by mixing a nickel-cobalt-manganese ternary precursor, a lithium source and a strontium source, calcining at a high temperature, crushing and sieving.

[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 mixed uniformly in a molar ratio of 1:(1-1.06):(0-0.005) , calcined in an air atmosphere for 3 to 40 hours, preferably 5 to 36 hours, during which the calcining temperature was programmed to increase from 200°C to 1000°C, and the heating rate was 5°C / min, then lowered to room temperature, crushed, passed 100 to 300 Mesh sieve to obtain ...

Embodiment 1

[0062] The preparation of the nickel cobalt lithium manganese oxide substrate of embodiment 1 doping Sr element

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

[0064] Put the sieved material into the crucible, and calcined in the muffle furnace under the air atmosphere for 36 hours, during which the calcining temperature was programmed to increase from 200°C to 1000°C, and the heating rate was 5°C / min, and then naturally dropped to room temperature , passed through a 200-mesh sieve after ball milling for 3 hours to obtain the matrix Li(Ni 0.5 mn 0.3 co 0.2 )1-x Sr x o 2 , where x=0.003.

Embodiment 20

[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 ultrapure water, stir under heating, wait until the temperature rises above 50°C, weigh 120g of the matrix prepared in step 1) and add it to the above solution, continue stirring and The solution was heated to 80°C to obtain a mixed solution A;

[0067] Weigh 0.167 g of aluminum nitrate nonahydrate and add it to a beaker with 30 mL of ultrapure water, stir to dissolve, add it to the mixed solution A at a flow rate of 10 mL / min through a constant flow pump, and heat the solution to 80°C, keep stirring for 1-2 hours;

[0068] Filter the solution after the above reaction is completed, place the filtered insoluble matter in an oven at 150°C, dry it, pass through a 300-mesh sieve, put it into a porcelain boat, and calcinate it in a muffle furnace at 550°C for 5 hours, then cool down naturally to At room tempe...

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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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