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Sodium doped lithium-manganese-rich base positive material and preparation method and application thereof

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low first Coulombic efficiency, lower voltage platform, poor structural stability, etc., to improve electrochemical performance, The effect of improved electrical performance and simple method

Inactive Publication Date: 2018-01-30
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although lithium-rich manganese-based cathode materials have high discharge specific capacity, there are still many problems in practical applications of this type of material: (1) the first Coulombic efficiency is low; (2) the structural stability is poor; (3) the discharge voltage The platform is gradually lowered; (4) Poor magnification performance
[0007] At present, there are many studies on the doping modification of different elements in lithium-ion battery cathode lithium-rich manganese-based materials, but mainly in the position of transition metal elements, and the doping at the lithium site is rare, and the discussion of the doping effect is also rare. There are reports

Method used

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  • Sodium doped lithium-manganese-rich base positive material and preparation method and application thereof
  • Sodium doped lithium-manganese-rich base positive material and preparation method and application thereof
  • Sodium doped lithium-manganese-rich base positive material and preparation method and application thereof

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preparation example Construction

[0042] A method for preparing a sodium-doped lithium-rich manganese-based positive electrode material, the method comprising:

[0043] Step 1: Mix lithium salt, sodium salt, nickel salt, cobalt salt and manganese salt, add volatile organic solvent, grind evenly, and dry;

[0044] Step 2: Grind the mixture obtained in step 1 into powder, mix it evenly with potassium salt, keep it warm at 400°C~500°C, and then keep it warm at 800°C~1000°C;

[0045] Step 3: After the heat preservation is completed, the remaining potassium salt is washed away to obtain a sodium-doped lithium-rich manganese-based positive electrode material.

[0046] In step 1, lithium salt, sodium salt, nickel salt, cobalt salt and manganese salt are respective carbonates respectively; The atomic ratio of lithium, sodium, nickel, cobalt and manganese in the chemical structure formula of the heterogeneous lithium-rich manganese-based particles.

[0047] In step 1, the volatile organic solvent is alcohol.

[0048...

Embodiment 1

[0055] A sodium-doped lithium-rich manganese-based cathode material, the cathode material comprising: sodium-doped lithium-rich manganese-based particles.

[0056] The chemical structure of Na-doped Li-rich Mn-based particles is Li[Li 0.12 Na 0.08 mn 0.54 Ni 0.13 co 0.13 ]O 2 (i.e. n=0.12, m=0.08, x=y=0.13).

[0057] Such as figure 1 Shown is the TEM (transmission electron microscope) image of the sodium-doped lithium-rich manganese-based positive electrode material in Example 1 of the present invention. The particle size of the sodium-doped lithium-rich manganese-based particles is at the nanomolar level, ranging from 100nm to 300nm.

[0058] The shape of the primary particles of the sodium-doped lithium-rich manganese-based particles is a three-dimensional hexagon.

[0059] The shape of the secondary particle of the sodium-doped lithium-rich manganese-based particles is spherical.

Embodiment 2

[0061] A preparation method of the sodium-doped lithium-rich manganese-based positive electrode material of embodiment 1, the method comprising:

[0062] Step 1: Mix Lithium Carbonate, Sodium Carbonate, Nickel Carbonate, Cobalt Carbonate, and Manganese Carbonate at a molar ratio of 1.12:0.08:0.13:0.13:0.54, put them into two ball mill jars, add alcohol of equal quality to maintain weight balance , milled in a planetary ball mill for 12 hours at a speed of 250rpm, and then dried the alcohol in a blast oven at 60°C;

[0063] Step 2: Grind the mixture obtained in step 1 into powder, mix it evenly with potassium salt at a mass ratio of 1:4, incubate at 450°C for 5h, and then incubate at 900°C for 10h;

[0064] Step 3: After the heat preservation is completed, the remaining potassium salt is washed away with distilled water to obtain a sodium-doped lithium-rich manganese-based positive electrode material.

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Abstract

The invention discloses a sodium doped lithium-manganese-rich base positive material and a preparation method and application thereof. The positive material comprises sodium-doped lithium-manganese-rich base granules, wherein the chemical structural formula of the sodium-doped lithium-manganese-rich base granules is: Li1+nNamNixC0yMn(1-x-y-n-m)O2, and 0 is smaller than or equal to n+m which is smaller than or equal to 1, 0 is smaller than or equal to x which is smaller than or equal to 1, and 0 is smaller than or equal to y which is smaller than or equal to 1. By the arrangement, even doping of sodium in a lithium bit is achieved through sodium doping, particle size is kept to be smaller than 500nm during preparation, and electrochemical performance of the lithium-manganese-rich base positive material is improved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium batteries, and relates to a lithium-rich manganese-based positive electrode material, in particular to a sodium-doped lithium-rich manganese-based positive electrode material and a preparation method and use thereof. Background technique [0002] With the development of science and technology, higher and higher requirements are placed on the performance of batteries. my country requires that the space power supply energy should reach 300Wh / kg by 2020. In terms of power batteries for new energy electric vehicles, my country and Japan have set a target for the specific energy of batteries to be higher than 200Wh / kg by 2020. To achieve these battery indicators, the development of cathode materials with a battery specific capacity indicator higher than 250 mAh / g has become a top priority. [0003] Among the existing cathode materials, layered structure cathode materials are st...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 贾荻朱蕾江小标王梦微汤卫平郑奕
Owner SHANGHAI INST OF SPACE POWER SOURCES
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