Lithium-site doped and metal oxide-coated lithium ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and their preparation, can solve problems such as increased charge transfer resistance, achieve improved cycle stability, improved electrochemical performance, and the effects of inhibiting reactions

Active Publication Date: 2015-05-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Our research found that such a layer of film can indeed improve the performance of the material, but at the same time it brings a problem t

Method used

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  • Lithium-site doped and metal oxide-coated lithium ion battery positive electrode material and preparation method thereof
  • Lithium-site doped and metal oxide-coated lithium ion battery positive electrode material and preparation method thereof
  • Lithium-site doped and metal oxide-coated lithium ion battery positive electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 is neither manganese oxide coating nor sodium doped material Li 1.17 Ni 0.62 co 0.14 mn 0.24 o 2 The preparation of is set for comparing with the product of embodiment 3.

Embodiment 2

[0029] Example 2 is only the Li coated with manganese oxide 1.17 Ni 0.62 co 0.14 mn 0.24 o 2 0.008MnO 2 The preparation of is set for comparing with the product of embodiment 3.

Embodiment 3

[0030] Example 3 is a sodium-doped manganese oxide-coated Li 1.07 Na 0.10 Ni 0.62 co 0.14 mn 0.24 o 2 0.008MnO 2 preparation.

[0031] Example 1: Li 1.17 Ni 0.62 co 0.14 mn 0.24 o 2 preparation of

[0032] (1) Preparation of precursor

[0033] Accurately weigh the sulfates of nickel, cobalt, and manganese in a molar ratio of 0.62:0.14:0.24, add water to dissolve to form a mixed salt solution, and control the total concentration of each metal ion in the solution between 0.1mol / l and a saturated solution; Sodium carbonate that is 1.1 times the total molar number of metal ions (0.62+0.14+0.24=1) is dissolved in water to form a sodium carbonate solution with a concentration between 0.1mol / l and a saturated solution. The above two solutions were mixed and reacted completely, resulting in a suspension. Under the protection of nitrogen, the obtained suspension was continuously stirred for 24 hours, during which the pH value of the solution was precisely controlled at 8....

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Abstract

The invention discloses a lithium-site doped and metal oxide-coated lithium ion battery positive electrode material and a preparation method thereof. The lithium ion battery positive electrode material has the chemical formula of Li(m-x)MexMaNbCcO2.yTO2, wherein Me refers to doped alkali metal or an alkaline-earth metal element; TiO2 refers to the coated metal oxide. The lithium-site doped and metal oxide coated lithium ion battery positive electrode material has the advantages that the coating metal oxide can be used for preventing the large-area contact of the lithium ion battery positive electrode material and electrolyte, and inhibiting the reaction between the battery positive electrode material with the high reaction property and electrolyte, so that the cyclic stability of the battery material can be improved greatly; the laminar structure of the lithium ion battery positive electrode material can be perfected by adopting coating, so that the electrochemical performance is also improved; partial lithium atoms in the battery positive electrode material can be replaced with alkali metal or alkaline-earth metal ions by adopting doping, so that a metal oxide layer is strutted, embedding and de-embedding of the lithium ion are facilitated, the high-current discharge performance of the material is improved, and the use of the rare element lithium is reduced.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a lithium ion battery positive electrode material doped with lithium and coated with a metal oxide, and belongs to the field of lithium ion battery positive electrode materials and its preparation. Background technique [0002] Compared with lead-acid, nickel-cadmium, and nickel-metal hydride batteries, lithium-ion batteries have the advantage of high energy density. At present, lithium-ion batteries are still mainly used in small portable devices, and the electric vehicle industry is continuing to make lithium-ion batteries applicable to electric vehicles. Electric vehicles do not produce air pollution and have low noise during operation. They can absorb the excess electricity in the city at night and achieve the effect of peak shaving and valley filling. They can also be operated by replacing batteries that are fully charged w...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/131H01M4/1391H01M4/04
CPCH01M4/139H01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 雷立旭米萨尔·艾德楠
Owner SOUTHEAST UNIV
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