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A kind of preparation method of graphene-coated manganese-based solid solution cathode material

A graphene-coated, positive electrode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as hindering the commercialization process, capacity loss, poor rate performance, etc., and achieve improved electrochemical cycle stability , the effect of high electronic conductivity and ionic conductivity

Active Publication Date: 2017-11-10
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the lithium-rich layered structure positive electrode material has a net release of Li after the end of the first charge. 2 O cannot return to the lattice of the bulk material during the subsequent discharge process, leading to the first irreversible capacity loss, and its poor rate capability severely hinders its commercialization.

Method used

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  • A kind of preparation method of graphene-coated manganese-based solid solution cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 5% graphene coated solid solution Li 1.2 (Mn 0.6 Ni 0.1 Co 0.1 )O 2 The preparation method includes the following steps:

[0024] (1) According to the molecular formula Li 1.2 (Mn 0.6 Ni 0.1 Co 0.1 )O 2 The molar ratio of Ni, Co, Mn in Ni (NO 3 ) 2 , Co(NO 3 ) 2 And Mn(NO 3 ) 2 , Prepare a mixed metal salt solution with a total metal ion concentration of 0.5 mol / L;

[0025] (2) Prepare 0.5mol / L oxalic acid solution;

[0026] (3) Use a peristaltic pump to continuously input the mixed metal salt solution and oxalic acid solution into the reaction flask, with a flow rate of 5 mL / min, a water bath temperature of 50 °C in the reactor, and a stirring speed of 550 rpm;

[0027] (4) After the reaction, the precipitate is centrifuged, washed with distilled water multiple times to remove residual ions, and dried at 100 °C to obtain a precursor for use;

[0028] (5) The massage ratio is 0.8: 0.6. Weigh the above-mentioned precursor and Li 2 CO 3 After mixing and grinding the powder uniforml...

Embodiment 2

[0032] 10% graphene coated solid solution Li 1.2 (Mn 0.6 Ni 0.1 Co 0.1 )O 2 The preparation method includes the following steps:

[0033] Steps (1)-(5) are the same as in Example 1;

[0034] (6) Mixing graphene with a mass fraction of 10% and the solid solution obtained in step (5) in an aqueous solution;

[0035] (7) After mixing, dry it in an oven, and then sinter it in an air atmosphere at 350 °C for 3 hours to obtain a graphene-coated manganese-based solid solution cathode material.

Embodiment 3

[0037] Graphene coated solid solution Li 1.1 (Mn 0.5 Ni 0.2 Co 0.2 )O 2 The preparation method includes the following steps:

[0038] (1) The molar ratio is 0.2:0.2:0.5. Weigh nickel acetate, cobalt acetate and manganese acetate to prepare a mixed metal salt solution with a total metal ion concentration of 1mol / L;

[0039] (2) Prepare 1mol / L oxalic acid solution;

[0040] (3) Use a peristaltic pump to continuously input the above-mentioned mixed metal salt solution and oxalic acid solution into the reaction flask at a flow rate of 5 mL / min, the temperature of the water bath of the reactor at 55 °C, and the stirring speed at 550 rpm;

[0041] (4) After the reaction, the precipitate is centrifuged, washed with distilled water multiple times to remove residual ions, and dried at 100 °C to obtain a precursor for use;

[0042] (5) The ratio of molar ratio is 0.9:1.1. Weigh the above-mentioned precursor and LiOH, mix and grind uniformly, and then calcinate in a muffle furnace step by step. Th...

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Abstract

The invention relates to a preparation method of a graphene-coated manganese-based solid solution positive pole material. The preparation method comprises that a transition metal ion mixed salt solution and an oxalic acid or oxalate solution are prepared, wherein concentrations of the solutions are the same, the two solutions are mixed and undergo a reaction, the reaction product is subjected to deposition and centrifugation separation so that a nickel-cobalt-manganese oxalate precursor is obtained, the nickel-cobalt-manganese oxalate precursor and a lithium salt are blended and sintered so that a manganese-based solid solution material is obtained, and the manganese-based solid solution material and graphene are blended, dried and sintered at a certain temperature so that the manganese-based solid solution positive pole material is obtained. Through coating of the solid solution with graphene, material conductivity is improved, multiplying power performances are improved and electrochemical cycle stability is improved.

Description

Technical field [0001] The invention belongs to the technical field of new energy materials, and specifically relates to a method for preparing a graphene-coated manganese-based solid solution cathode material. Background technique [0002] With the increasing demand for energy and the deepening of the awareness of the importance of sustainable social and economic development, lithium-ion batteries characterized by green environmental protection and high efficiency have attracted more and more attention. At present, the specific capacity of anode materials for lithium-ion batteries is usually above 300 mAh / g, while the specific capacity of cathode materials has always hovered around 150 mAh / g. The lithium-rich layered structure cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M = at least one of Ni, Co, Mn) The theoretical specific capacity exceeds 300 mAh / g, and the actual usable capacity is greater than 200 mAh / g. Due to the large amount of Mn used in the material, it is compatible wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/1391H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL