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Preparation method and application of lithium-rich layered oxide cathode material

A technology of positive electrode materials and oxides, which is applied in the field of preparation of lithium-rich layered oxide positive electrode materials, can solve undiscovered problems, achieve the effects of reducing oxygen precipitation, improving cycle capacity retention, and high process repeatability

Active Publication Date: 2017-02-15
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through searching, for the doped lithium-rich layered oxide cathode material Li[Li (1-2x) / 3 Ni x-y m 2y mn 2 / 3-x / 3-y ]O 2 (0

Method used

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  • Preparation method and application of lithium-rich layered oxide cathode material
  • Preparation method and application of lithium-rich layered oxide cathode material
  • Preparation method and application of lithium-rich layered oxide cathode material

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Embodiment 1

[0029] A preparation method of a lithium-rich layered oxide positive electrode material, the chemical molecular formula of the lithium-rich layered oxide positive electrode material is Li[Li 0.28 Ni 0.06 Fe 0.04 mn 0.62 ]O 2 (x=1 / 12, M=Fe, y=0.02), its preparation method step is as follows:

[0030] 1) Weigh 87.14g MnSO 4 ·H 2 O and 16.16g Fe(NO 3 ) 3 9H 2 O preparation metal ion concentration is the solution of 1mol / L;

[0031] 2) under continuous stirring condition, slowly add the mixed solution of ammoniacal liquor and sodium carbonate in above-mentioned solution, ammoniacal liquor concentration is 0.2mol / L in the mixed solution, and sodium carbonate concentration is 2mol / L, to control reaction solution pH value is 10, A precipitation reaction was performed, and the precipitate was filtered, washed, and dried to obtain Fe-doped MnCO 3 Material;

[0032] 3) Weigh 41.05g Li 2 CO 3 , and combine it with the Fe-doped MnCO obtained in step 2) 3 The materials were m...

Embodiment 2

[0039] A preparation method of a lithium-rich layered oxide positive electrode material, the chemical molecular formula of the lithium-rich layered oxide positive electrode material is Li[Li 0.2 Ni 0.1 co 0.2 mn 0.5 ]O 2 (x=1 / 5, M=Co, y=0.1), its preparation method step is as follows:

[0040] 1) Weigh 27.58g LiNO respectively 3 ·H 2 O,22.99gMnCO 3 and 16.05gCo 3 o 4 ,well mixed;

[0041] 2) The mixture obtained in step 1) is placed in a muffle furnace for calcination, the calcination temperature is 750°C, and the calcination time is 5h to obtain Co-doped Li 2 MnO 3 Material;

[0042] 3) Preparation of 42.78g NiCl·6H 2 O and 50.71 g MnSO 4 4H 2 O mixed solution, the total concentration of metal ions is 2.5mol / L;

[0043] 4) under continuous stirring condition, slowly add the mixed solution of ammoniacal liquor and sodium hydroxide in the solution of step 3) gained, in the mixed solution, the concentration of ammoniacal liquor is 0.3mol / L, and the concentration o...

Embodiment 3

[0049] A preparation method of a lithium-rich layered oxide positive electrode material, the chemical molecular formula of the lithium-rich layered oxide positive electrode material is Li[Li 0.11 Ni 0.28 al 0.1 mn 0.51 ]O 2 (x=1 / 3, M=Al, y=0.05), its preparation method step is as follows:

[0050] 1) Weigh 9.32g LiOH, 10.87gMn(OH) respectively 2 and 37.51gAl(NO 3 ) 3 9H 2 O, mix well;

[0051] 2) The mixture obtained in step 1) is placed in a muffle furnace for calcination, the calcination temperature is 550°C, and the calcination time is 55h to obtain Al-doped Li 2 MnO 3 Material;

[0052] 3) the Al-doped Li obtained in step 2) 2 MnO 3 Material with 24.63g Li 2 CO 3 , 10.21gNiO and 44.06gMnCO3 mix homogeneously, obtain mixture;

[0053] 4) The mixture obtained in step 3) was placed in a muffle furnace for calcination, the calcination temperature was 700° C., and the calcination time was 15 hours to obtain 86.85 g of lithium-rich layered oxide cathode material Li[...

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Abstract

The invention discloses a preparation method of a lithium-rich layered oxide cathodee material. The chemical formula of the lithium-rich layered oxide cathode material is Li[Li<(1-2x) / 3>Ni<x-y>M<2y>Mn<2 / 3-x / 3-y>]O<2>, wherein x is greater than 0 and smaller than 0.5, y is greater than 0 and smaller than x, and M is one or a mixture of two or more than two of Fe, Co, Al and Cr in any proportion. The preparation method of the lithium-rich layered oxide cathode material comprises the following steps: firstly using a high-temperature solid-phase method to prepare an M-doped Li2MnO3 material, then mixing the M-doped Li2MnO3 material with an Li source material, an Ni source material and an Mn source material, and mixing at the temperature of 700 to 950 DEG C and roasting for 5 to 15 h so as to obtain the target object. The material prepared by the invention has the advantages of stable structure, easily controlled conditions, high batch stability and the like, and is suitable for scale production; and a button cell assembled by using the prepared lithium-rich layered oxide cathode material has the advantages of high first-time charging and discharging efficiency, small voltage attenuation, good cycle performance and the like.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, in particular to a preparation method and application of a lithium-rich layered oxide positive electrode material. Background technique [0002] With the popularity of portable electronic products, hybrid vehicles and pure electric vehicles, lithium-ion batteries have also been used more and more widely. In recent years, in order to develop lithium-ion batteries with high energy density, many positive electrode materials with high energy density have been developed. Among them, lithium-rich layered oxide cathode materials have attracted in-depth research because of their advantages such as high discharge capacity, wide voltage platform, and environmental protection. The expression for lithium-rich layered oxide materials is Li(Li 1 / 3-2x / 3 Ni x mn 2 / 3-x / 3 )O 2 (0<x<1 / 2), which can be regarded as Li 2 MnO 3 (Layered materials can be expres...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M10/0525H01M4/36
CPCH01M4/366H01M4/505H01M10/0525Y02E60/10
Inventor 张联齐张雪雯张洪周宋大卫时喜喜
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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