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A kind of Wo3 coated lithium manganese oxide material and preparation method thereof

A technology for coating lithium manganate and lithium heteromanganate, which is applied to structural parts, electrical components, battery electrodes, etc., to achieve the effects of improved deliquescence, uniform coating of precipitation reaction, and easy large-scale production

Inactive Publication Date: 2016-04-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But will WO 3 As a coated lithium manganese oxide material to solve the problem of interface stability between lithium manganate and electrolyte, there is no report yet

Method used

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  • A kind of Wo3 coated lithium manganese oxide material and preparation method thereof
  • A kind of Wo3 coated lithium manganese oxide material and preparation method thereof
  • A kind of Wo3 coated lithium manganese oxide material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of WO 3 Coating lithium manganate material to dope lithium manganate LiMn 1.96 Al 0.04 o 3.98 f 0.02 as the core, with WO 3 is the cladding layer, WO 3 Coated lithium manganese oxide material, WO 3 The content is 0.5%.

[0028] The WO 3 The preparation method of coated lithium manganese oxide material is:

[0029] (1) Preparation of doped lithium manganese oxide LiMn by high-temperature solid-state method 1.96 Al 0.04 o 3.98 f 0.02 : 3.92mol manganese dioxide, 0.98mol lithium carbonate, 0.04molAl 2 o 3 After mixing with 0.04molLiF, first raise the temperature to 650°C, sintering time 8h, then raise the temperature to 750°C, sintering time 15h;

[0030] (2) prepare the aqueous solution of ammonium tungstate, adjust the pH of the solution to be 8.0, the doped lithium manganate LiMn prepared in step (1) 1.96 Al 0.04 o 3.98 f 0.02 Add to the aqueous solution of ammonium tungstate, stir at 110°C for 6h;

[0031] (3) Sinter the mixture prepared in st...

Embodiment 2

[0036] A kind of WO 3 Coating lithium manganate material to dope lithium manganate LiMn 1.98 Ga 0.02 o 3.97 f 0.03 as the core, with WO 3 is the cladding layer, WO 3Coated lithium manganese oxide material, WO 3 The content is 5%.

[0037] (1) Preparation of doped lithium manganese oxide LiMn by high-temperature solid-state method 1.98 Ga 0.02 o 3.97 f 0.03 : After mixing 3.96mol of manganese dioxide, 0.97mol of lithium carbonate, 0.02mol of gallium oxide and 0.06mol of lithium fluoride, first raise the temperature to 600°C for 10h of sintering time, then raise the temperature to 750°C for 30h of sintering time;

[0038] (2) prepare the aqueous solution of ammonium tungstate, adjust the pH of the solution to be 7.5, the doped lithium manganate LiMn prepared in step (1) 1.98 Ga 0.02 o 3.97 f 0.03 Add to the aqueous solution of ammonium tungstate, stir at 140°C for 2h;

[0039] (3) Sinter the mixture prepared in step (2) at 400°C for 3h and cool to obtain WO 3 Coa...

Embodiment 3

[0044] A kind of WO 3 Coating lithium manganate material to dope lithium manganate LiMn 1.93 Mg 0.07 o 3.98 Cl 0 . 02 as the core, with WO 3 is the cladding layer, WO 3 Coated lithium manganese oxide material, WO 3 The content is 0.8%.

[0045] (1) Preparation of doped lithium manganese oxide LiMn by high-temperature solid-state method 1.93 Mg 0.07 o 3.98 Cl 0.02 : After mixing 3.86mol of manganese dioxide, 1mol of lithium carbonate, 0.12mol of magnesium nitrate and 0.02mol of magnesium chloride, first raise the temperature to 700°C, sintering time 9h, then raise the temperature to 850°C, sintering time 8h;

[0046] (2) prepare the aqueous solution of ammonium tungstate, adjust the pH of the solution to be 7.3, the doped lithium manganate LiMn prepared in step (1) 1.93 Mg 0.07 o 3.98 Cl 0.02 Add to the aqueous solution of ammonium tungstate, stir at 120°C for 3h;

[0047] (3) Sinter the mixture prepared in step (2) at 450°C for 5h and cool to obtain WO 3 Coate...

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Abstract

The invention discloses a WO3-coated lithium manganate material which uses doped lithium manganate LiMn(2-x)MxO(4-delta)Ndelta as a core and WO3 as a coating layer, wherein X is equal to 0-0.15, and delta is equal to 0.01-0.04; M is one or more of Al, Mg, Ga, and Si elements, and N is one or more of F, S and Cl. The invention further discloses a preparation method of the WO3-coated lithium manganate material. The preparation method comprises the following steps: preparing doped lithium manganate LiMn(2-x)MxO(4-delta)Ndelta by using a high-temperature and solid-phase method, then adding prepared doped lithium manganate in an ammonium tungstate solution, uniformly mixing, sintering at a temperature of 350-600 DEG C for 2-10 hours, and cooling to obtain the WO3-coated lithium manganate material. The WO3-coated lithium manganate material disclosed by the invention has a stable lithium manganate interface reaction, and thus normal temperature and high temperature circle stability of lithium manganate is improved; by using WO3 as the coating material, the WO3-coated lithium manganate material does not absorb moisture; compared with zinc phosphate coating, the WO3 coating has the advantage that the hygroscopy is improved; the preparation method is simple in preparation process and convenient to operate; the large-scale production is easily realized.

Description

technical field [0001] The present invention relates to a WO 3 A coated lithium manganese oxide material and a preparation method thereof belong to the technical field of lithium ion battery electrode materials. Background technique [0002] Lithium-ion batteries are considered as the preferred batteries to solve energy and environmental problems because of their high charging and discharging voltage, long service life, safety and non-toxicity. Lithium manganese oxide has become one of the most promising cathode materials for lithium-ion batteries due to its abundant resources, low cost, no pollution, simple synthesis process, good safety, and good rate performance. Spinel lithium manganese oxide has a stable structure and has three-dimensional lithium ion channels, which can withstand high-current charging and discharging. It is an ideal power battery cathode material. Lithium-ion batteries that use it as the cathode material of lithium-ion batteries are used in electric b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/62
CPCH01M4/366H01M4/505H01M4/628H01M10/0525Y02E60/10
Inventor 张建新冯小钰姚斌路婷婷丁昭郡
Owner SHANDONG UNIV
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