Doping method of lithium-rich layered oxide positive electrode material, material and preparation method

A technology of positive electrode materials and oxides, applied in the field of materials, can solve the problems of large irreversible capacity of manganese-based lithium-rich oxides, failure to achieve commercialization, unstable cycle performance, etc., to reduce irreversible capacity loss, improve performance, and simple method easy effect

Active Publication Date: 2017-01-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, manganese-based lithium-rich oxides have problems such as excessive irreversible capacity in the first week, unstable cycle performance, and poor rate performance, which cannot meet the requirements of commercialization.

Method used

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  • Doping method of lithium-rich layered oxide positive electrode material, material and preparation method
  • Doping method of lithium-rich layered oxide positive electrode material, material and preparation method
  • Doping method of lithium-rich layered oxide positive electrode material, material and preparation method

Examples

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Embodiment 1

[0042] An embodiment of the present invention provides a method for doping a lithium-rich layered oxide cathode material of a lithium ion battery.

[0043] The method is: using divalent and above cations M n+ , the partial substitution of lithium ions Li for the lithium layer in lithium-rich layered oxides + , to obtain a lithium-rich layered oxide cathode material containing doping elements.

[0044] The general chemical formula of the cathode material is: [Li 1-nα m α ][Li x mn y tm 1-x-y ]O 2 .

[0045] Among them, M is a cation for doping and replacing lithium ions in the lithium layer, including one or more of transition metal ions, alkaline earth metal ions, group IIIA main group metal ions or IVA main group metal ions, specifically including Ti , one or more of Zr, Mn, Ni, Mg, Cu, Zn, Al, V, Ca, Mg, Co, Sn, Ru, Cr, Nb, Mo. TM is a metal ion in the transition metal layer, including one or more of Mn, Ni, Co, Cr, Ru, Mg, Cu, Zn, Al, Ti, Zr, V, Nb, Mo, Sn; n is T...

Embodiment 2

[0055] This example is used to illustrate a specific preparation method of the lithium-rich layered oxide positive electrode material containing doping elements: sol-self-propagating combustion method.

[0056] The steps of the preparation method are as follows figure 2 shown, including:

[0057] Step 210, mix the required stoichiometric lithium nitrate, M nitrate and TM nitrate in proportion, dissolve in deionized water to mixed solution A;

[0058] Among them, M includes: one or more of Ti, Zr, Mn, Ni, Mg, Cu, Zn, Al, V, Ca, Mg, Co, Sn, Ru, Cr, Nb, Mo; TM includes: Mn , one or more of Ni, Co, Cr, Ru, Mg, Cu, Zn, Al, Ti, Zr, V, Nb, Mo, Sn.

[0059] Step 220, weighing a certain amount of organic reducing agent and dissolving it in deionized water to prepare solution B;

[0060] Specifically, the organic reducing agent may include: glycine, citric acid, ethylenediaminetetraacetic acid (EDTA), succinic acid, malic acid or tartaric acid and the like.

[0061] Step 230, mixin...

Embodiment 3

[0067] This example is used to illustrate another specific preparation method of the lithium-rich layered oxide positive electrode material containing doping elements: sol-gel method.

[0068] The steps of the preparation method are as follows image 3 shown, including:

[0069] Step 310, dissolving the required stoichiometric soluble lithium salt, M soluble salt and TM soluble salt in deionized water in proportion;

[0070] Among them, M includes: one or more of Ti, Zr, Mn, Ni, Mg, Cu, Zn, Al, V, Ca, Mg, Co, Sn, Ru, Cr, Nb, Mo; TM includes: Mn , one or more of Ni, Co, Cr, Ru, Mg, Cu, Zn, Al, Ti, Zr, V, Nb, Mo, Sn.

[0071] Step 320, gradually adding the mixed solution of citric acid and ethylene glycol;

[0072] Step 330, stirring magnetically at 90° C. for 1 to 4 hours, and then evaporating to dryness with magnetic stirring at 140° C. to form a precursor gel;

[0073] Step 340, placing the precursor gel in an oven, and drying in an air atmosphere at 150° C. to 200° C. fo...

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Abstract

The invention discloses a doping method of a lithium-rich layered oxide positive electrode material, the material and a preparation method. The method comprises the steps of partially substituting lithium ions Li<+> of a lithium layer in a lithium-rich layered oxide by divalent positive ions Mn<+> and above to obtain the lithium-rich layered oxide positive electrode material containing a doping element.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a doping method, material and preparation method for a lithium-rich layered oxide positive electrode material for a lithium ion battery. Background technique [0002] In recent years, with the development of electronic equipment, people's demand for lithium-ion batteries is increasing, and the requirements for its electrochemical performance and safety performance are also increasing. On the other hand, the development of electric vehicles has put forward higher requirements for the application of lithium-ion batteries. Lithium-ion batteries are expected to have high energy density, long cycle life, and safety. [0003] Lithium-ion battery cathode materials are the key factors that limit the energy density, cycle performance and cost of lithium-ion batteries. Improving the performance of cathode materials plays a particularly prominent role in improving the performance of lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 冯欣王兆翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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