A kind of nickel cobalt lithium manganate modified material and its preparation method and application

A technology of nickel-cobalt lithium manganese oxide and modified materials, which is applied in the field of nickel-cobalt lithium manganese oxide modified materials and its preparation, can solve the problems of limited level and lower energy density of nickel-cobalt lithium manganese oxide, and improve the stable phase, Good cycle performance and the effect of improving energy density

Active Publication Date: 2016-08-24
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For example, in terms of doping modification, Al, Mg, Ti, Zn, Zr, F, Cl, S, La, Ce, Pr, Li, Fe, Si, B, Cr, Cu, Sn, Ga, Nb and other metal ions or non-metal ions to obtain nickel cobalt lithium manganese oxide doped with metal ions or non-metal ions (usually doped with metal ions), although by doping metal ions, The stability of lithium nickel cobalt manganese oxide is improved, but the level of improvement is very limited
In terms of surface coating modification, AlPO is usually 4 , MgO, NiO, Al 2 o 3 、TiO 2 , ZrO 2 , ZnO and other metal oxides are coated on the surface of nickel-cobalt-lithium manganese oxide to improve the structural stability of nickel-cobalt-lithium manganese oxide. However, since the coated metal oxides are non-electrochemically active substances, they will Reduce the energy density of lithium nickel cobalt manganese oxide

Method used

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  • A kind of nickel cobalt lithium manganate modified material and its preparation method and application
  • A kind of nickel cobalt lithium manganate modified material and its preparation method and application
  • A kind of nickel cobalt lithium manganate modified material and its preparation method and application

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preparation example Construction

[0049] In the third aspect, the embodiment of the present invention also provides a preparation method of nickel cobalt lithium manganese oxide modified material, with figure 1 For the preparation flow chart of this method, as attached figure 1 As shown, the method includes:

[0050] Step 101, according to the chemical formula LiMn 2-a m a o 4 The stoichiometric ratio, the aqueous solution of the mixture of preparation Mn salt and M salt,

[0051] The LiMn 2-a m a o 4 where 0

[0052] Step 102: Add nickel-cobalt lithium manganate or nickel-cobalt lithium manganate doped with metal ions to the aqueous solution of the mixture of Mn salt and M salt, stir evenly, and then add a precipitant to precipitate Mn ions and M ions , separated and obtained the precipitate.

[0053] Step 103, according to the chemical formula LiMn 2-a m a o 4 The stoichiometric ratio is uniformly mixed with the precipitate and the lithium so...

Embodiment 1

[0071] This embodiment provides a LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Modified materials, including: LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , and coated in LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Surface LiNi 0.5 mn 1.5 o 4 , where LiNi 0.5 mn 1.5 o 4 The mass of the LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 2% of the mass of the modified material. The LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The preparation steps of the modified material are as follows:

[0072] Prepare an aqueous solution of a mixture of soluble nickel chloride and manganese sulfate according to the molar ratio Ni:Mn=1:3, and add LiNi to the aqueous solution of the mixture under stirring 1 / 3 co 1 / 3 mn 1 / 3 o 2 , disperse evenly, and then add sodium carbonate dropwise to the mixed solution to completely precipitate the nickel ions and manganese ions, obtain the precipitate by suction filtration, wash the precipitate 3 times, and dry it.

[0073] The above-mentioned dry precipitate and lithium carbonate (Li excess 2%) are mixed uniformly, then ...

Embodiment 2

[0075] This embodiment provides a LiCoO 2 Modified materials, including: LiCoO 2 , and coated in LiCoO 2 Surface LiFe 0.5 mn 1.5 o 4 , where LiFe 0.5 mn 1.5 o 4 The mass of the LiCoO 2 0.2% of the mass of the modified material. The LiCoO 2 The preparation steps of the modified material are as follows:

[0076] Prepare an aqueous solution of a mixture of soluble ferric chloride and manganese sulfate according to the molar ratio Ni:Mn=1:3, and add LiCoO to the aqueous solution of the mixture under stirring 2 , disperse evenly, and then add dropwise oxalic acid to the mixed solution to completely precipitate the iron ions and manganese ions, obtain the precipitate by suction filtration, wash the precipitate 3 times, and dry it.

[0077] Mix the above-mentioned dried precipitate with lithium acetate (5% excess Li), then program temperature control, and calcinate the mixture of the precipitate and lithium acetate in air. The specific calcination process is as follows: he...

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Abstract

The invention discloses a LiNixCoyMn2O2 modified material and a preparation method and application thereof, belonging to the field of an anode material for a lithium ion battery. The LiNixCoyMn2O2 modified material comprises LiNixCoyMn2O2 or LiNixCoyMn2O2 doped with metal ions and LiMn<2-a>MaO4 coating the surface of the LiNixCoyMn2O2 or the LiNixCoyMn2O2 doped with the metal ions, wherein in the LiMn<2-a>MaO4, a is more than zero and less than 1.2, and M is selected from Cr, Co, Ni, Cu, Fe, Mo or V. By using the LiMn<2-a>MaO4 as a coating layer, the overcharging performance of the LiNixCoyMn2O2 during charging and discharging is enhanced, a structure of the LiNixCoyMn2O2 is prevented from being collapsed, the stability of the LiNixCoyMn2O2 is improved, moreover, the charging cut-off voltage of the LiNixCoyMn2O2 is increased, the energy density of a LiNixCoyMn2O2 battery is improved, and the LiNixCoyMn2O2 material has the advantages of favorable cycle performance, rate capability and safety performance.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a nickel-cobalt-lithium-manganese-oxide modified material and a preparation method and application thereof. Background technique [0002] Lithium nickel cobalt manganate (LiNi x co y mn z o 2 , wherein, 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z=1) is a lithium-ion battery positive electrode material with excellent electrochemical performance, and the lithium-ion battery prepared by using it It has the advantages of high specific capacity, high energy density, small self-discharge, no memory effect and strong cycle stability. Studies have found that increasing the charge cut-off voltage of the battery can correspondingly obtain a high-capacity and high-voltage platform, that is, increase the energy density of the battery. However, for a battery made of nickel-cobalt lithium manganese oxide, increasing the cut-off voltage will cause the capacity of the ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘三兵梅周盛朱广燕陈效华
Owner CHERY AUTOMOBILE CO LTD
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