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A preparation method of lanthanum-iron-nickel doped lithium cobaltate-carbon composite cathode material

A cathode material, lithium cobalt oxide technology, used in battery electrodes, electrical components, circuits, etc., can solve the problems of poor thermal stability, high irreversible capacity at first discharge, achieve long service life, high reversible capacity at first discharge, and improve material activity and stability effects

Active Publication Date: 2016-06-08
TAIYUAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this material still has Ni 2+ Difficult to completely oxidize to Ni 3+ resulting in the high temperature crystallization process of Ni 2+ with Li + The "cation mixing" phenomenon, poor thermal stability and high irreversible capacity of the first discharge and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The chemical formula of the lanthanum-iron-nickel-doped lithium cobalt oxide prepared in this example is LiNi 0.47 Fe 0.1 co 0.4 La 0.03 o 2 . Lithium oxalate, nickel oxide, iron acetate, cobalt oxide, and lanthanum oxide are weighed according to the molar weights of Li, Ni, Fe, Co, and La in the above chemical formula, and the ingredients are prepared, and an appropriate amount of water and ethanol is used as the dispersion medium, and the wet method is performed. Ball mill the mixture to obtain a mixed slurry.

[0018] The mixed slurry is spray-dried, and the dry material is heated up in the heat treatment atmosphere of air mixture for preheating. The heating rate is 10°C / min, the heat preservation range is 450°C, and the heat preservation time is 2h, and the pre-fired material is obtained. , crushing the calcined material to obtain a precursor of lanthanum-iron-nickel-doped lithium cobalt oxide.

[0019] Mix the lanthanum-iron-nickel-doped lithium cobalt oxide ...

Embodiment 2

[0022] The chemical formula of the lanthanum-iron-nickel-doped lithium cobalt oxide prepared in this example is LiNi 0.25 Fe 0.2 co 0.5 La 0.05 o 2 . Lithium oxalate, nickel oxide, iron acetate, cobalt oxide, and lanthanum oxide are weighed according to the molar weights of Li, Ni, Fe, Co, and La in the above chemical formula, and the ingredients are prepared, and an appropriate amount of water and ethanol is used as the dispersion medium, and the wet method is performed. Ball mill the mixture to obtain a mixed slurry.

[0023] The mixed slurry is spray-dried, and the drying material is heated up in the heat treatment atmosphere of air mixture for preheating treatment. The heating rate is 15°C / min, the heat preservation range is 600°C, and the heat preservation time is 2h to obtain pre-fired material , crushing the calcined material to obtain a precursor of lanthanum-iron-nickel-doped lithium cobalt oxide.

[0024] Mix the lanthanum-iron-nickel-doped lithium cobaltate pr...

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Abstract

The invention relates to a preparation method of a lanthanum ferrum nickel doped lithium cobaltate-carbon composite positive electrode material. The method comprises the following steps: (1) weighing lithium oxalate, nickel oxide, ferric acetate, cobaltous oxide and lanthanum oxide according to the moles of Li, Ni, Fe, Co and La in the chemical formula LiNi(1-x-y-z)FexCoyLazO2 of lanthanum ferrum nickel doped lithium cobaltate, burdening, carrying out wet process ball-milling mixing by taking proper amount of water and ethyl alcohol as dispersion media so as to obtain mixed slurry, spray-drying the mixed slurry, preheating to obtain pre-sintering materials, and crushing to obtain a precursor, wherein x is equal to 0.1-0.2, y is equal to 0.4-0.5, and z is equal to 0.03-0.05; (2) coating the lanthanum ferrum nickel doped lithium cobaltate precursor with organic carbon; and (3) sintering. The lanthanum ferrum nickel doped lithium cobaltate-carbon composite positive electrode material prepared by the method improves the substance activity and stability by further doping a rare earth element La and a transition element Fe based on a nickel and cobalt mixture for modifying.

Description

Technical field [0001] The invention relates to a preparation method of lanthanum-iron-nickel-doped lithium cobaltate-carbon composite cathode material. Background technique [0002] Lithium-ion secondary batteries are playing an increasingly important role in people's daily life, and they are widely used in portable electronic products and mobile tools. At present, the positive electrode materials studied have a layered structure mainly LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMn with spinel structure 2 o 4 , LiFePO with olivine structure 4 Wait. [0003] LiCoO 2 It is the main cathode material for commercial lithium-ion batteries at present, but it has disadvantages such as expensive, not conducive to environmental protection, and low specific capacity. LiNiO 2 The positive electrode material doped with Co element also has LiNiO 2 The high discharge specific capacity of the material stabilizes the layered structure of the material and enhances the cycle stability of the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/62
CPCH01M4/525H01M4/62H01M4/625Y02E60/10
Inventor 李鹏李振中梁淑君翟燕赵彦亮
Owner TAIYUAN INST OF TECH