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Dual-modified lithium manganate material and preparation method thereof

A kind of permanent lithium manganate, lithium manganate technology, applied in the field of double modified lithium manganate material and its preparation, can solve problems such as uneven distribution, achieve full utilization, high capacity and cycle stability, and improve interface stability sexual effect

Active Publication Date: 2021-06-11
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the technical problem to be solved by the present invention is to overcome the existing one-step method to dope lithium manganate, the technical problem that the doped elements present in the coating are unevenly distributed in the bulk phase, and propose A kind of preparation process is simple and efficient, and double-modified lithium manganese oxide material can be obtained in only one step, which can realize industrial production and evenly distribute the doped elements in the bulk phase, effectively improve the cycle stability and ensure the capacity of the material Double-modified lithium manganate material and preparation method thereof

Method used

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preparation example Construction

[0031]Another aspect of the present invention also provides a method for preparing the double-modified lithium manganate material described in any of the above technical solutions, comprising the following steps:

[0032] Configure an aqueous solution containing a certain proportion of lithium, manganese, and modifying elements, which is denoted as solution A;

[0033] Configure a solution of a certain concentration of organic complexing agent, denoted as solution B;

[0034] Adding the solution A to the solution B, controlling the reaction temperature and pH value until a gel-like substance is obtained;

[0035] The above gel-like substance was dried and ball-milled, and then in N 2 / O 2 The first-stage calcination and the second-stage calcination are carried out under a mixed atmosphere to obtain a double-modified lithium manganate material.

[0036] The preparation of the traditional double-modified lithium manganate material is to modify the finished positive electrode ...

Embodiment 1

[0045] (1) Weigh 11.32g, 88.68g, 1.50g of LiOH, MnAC, Al(NO 3 ) 3 Dissolved in 500ml deionized water, recorded as solution A;

[0046] (2) Take by weighing 112.02g of citric acid and dissolve it in 200ml of deionized water, and record it as solution B;

[0047] (3) Gradually add solution A to solution B, control the reaction temperature to 65°C and pH to 8.5, until a gel-like substance is formed;

[0048] (4) Dry and ball-mill the gel-like substance obtained in step (3), then place the powder material in a tube furnace for calcination, control the volume ratio of oxygen in the atmosphere to 0.86, and heat the first stage at 650°C. 8h; after annealing, cool down to 450°C and keep warm for 3h. A double-modified lithium manganate material coated with carbon and alumina on the surface and doped with aluminum can be obtained.

Embodiment 2

[0050] (1) Weigh 11.32g, 89.09g, and 1.20g of LiOH and MnSO respectively 4 , MgSO 4 Dissolved in 500ml deionized water, recorded as solution A;

[0051] (2) Take by weighing 85.78g of glutamic acid and dissolve in 200ml of deionized water, and record it as solution B;

[0052] (3) Gradually add solution A to solution B, control the reaction temperature to 50°C and pH to 10, until a gel-like substance is formed;

[0053] (4) Dry and ball-mill the gel-like substance obtained in step (3), then place the powder material in a tube furnace for calcination, control the volume ratio of oxygen in the atmosphere to 0.92, and heat it for 10 hours at a calcination temperature of 600°C for the first stage ; After annealing, cool down to 500°C and keep warm for 4h. A double-modified lithium manganate material coated with carbon and magnesium oxide and doped with magnesium can be obtained.

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Abstract

The invention discloses a dual-modified lithium manganate material and a preparation method thereof, and belongs to the field of positive electrode materials. Metal elements are doped in a bulk phase of the dual-modified lithium manganate material, a metal oxide coating layer is arranged on the surface of the dual-modified lithium manganate material, and a carbon coating layer is arranged between the metal oxide coating layer and a main body material; and the doping amount of the metal elements ranges from 1000 ppm to 10000 ppm. The preparation method is applied to the aspect of lithium ion battery positive electrode materials, solves the technical problem that doped elements are not uniformly distributed in a bulk phase when lithium manganate is doped and coated by an existing one-step method, and has the advantages that the preparation process is simple and efficient, and the dual-modified lithium manganate material can be obtained by only one step; and industrial production can be realized, doped elements are uniformly distributed in a bulk phase, and the material capacity is ensured while the cycling stability is effectively improved.

Description

technical field [0001] The invention belongs to the field of cathode materials, in particular to a double-modified lithium manganate material and a preparation method thereof. Background technique [0002] As an important part of lithium-ion batteries, the performance of cathode materials largely determines the energy density and power density of lithium-ion batteries. Lithium manganese oxide cathode material has the advantages of high platform voltage, low cost, safety, environmental protection and non-toxicity, and has the prospect of wide application. However, in the long cycle process, the J-T effect is prone to occur in lithium manganate material, which induces lattice distortion and leads to structural phase transition; Mn 3+ A disproportionation reaction occurs to generate Mn 2+ , leading to the dissolution of manganese under the corrosion of the electrolyte, resulting in a sharp deterioration of the cycle performance of the material. In order to solve the above pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12C01F7/30C01F5/12C01B32/05
CPCC01G45/12C01F7/308C01B32/05C01F5/12C01P2004/80C01P2006/40Y02E60/10
Inventor 王圣贤谢芳苗力孝刘天雷牛庆荣崔云龙刘如雷
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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