Method for preparing lithium ion battery cathode material in-situ carbon coated lithium manganese borate composite material

A technology of carbon-coated lithium manganese borate and carbon composite materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unsatisfactory discharge specific capacity of lithium manganese borate, easy oxidation of lithium manganese borate, and poor cycle stability. Achieve good cycle stability, easy to implement, and improve the effect of electrical conductivity

Inactive Publication Date: 2012-04-04
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance of lithium manganese borate is very sensitive to the synthesis process (referring to people such as M.He., Solid State Chem.2002, 16, 187-192.), and the discharge specific capacity achieved at present by lithium manganese borate is not ideal during practical application , there are many reasons, not only related to the preparation process, but also related to some characteristics of lithium manganese borate itself, such as lithium manganese borate is easy to oxidize and has poor cycle stability

Method used

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  • Method for preparing lithium ion battery cathode material in-situ carbon coated lithium manganese borate composite material
  • Method for preparing lithium ion battery cathode material in-situ carbon coated lithium manganese borate composite material
  • Method for preparing lithium ion battery cathode material in-situ carbon coated lithium manganese borate composite material

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Experimental program
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Effect test

Embodiment 1

[0035]Embodiment 1, the composite material (h-LiMnBO of hexagonal manganese borate lithium and carbon 3 C) Preparation

[0036] Add 0.4413g of lithium hydroxide, 1.1498g of manganese carbonate, and 0.6190g of boric acid into a 0.3mol / L ethanol solution of ascorbic acid (Li:Mn:B:carbon source=1.05:1:1:0.6), ball mill for 6h, and the above The slurry was dried in an oven at 80°C to obtain a powder. Under an argon protective atmosphere, the temperature was raised to 300°C at a rate of 10°C / min for 5 hours of pre-calcination to obtain a precursor; the precursor was ground, and then The same heating rate of 10°C / min was raised to 700-750°C for calcination for 10h (argon protection was required during this process). After naturally cooling down to room temperature, the obtained sample is a composite material of hexagonal manganese lithium borate and carbon (h-LiMnBO 3 C), the XRD diffraction pattern of the product is as follows figure 1 shown. It can be used as the positive elec...

Embodiment 2

[0037] Embodiment 2, the composite material (m-LiMnBO of monoclinic manganese lithium borate and carbon 3 C) Preparation

[0038] Lithium carbonate 0.7389g, manganese carbonate 2.2990g, boric acid 1.2365g and citric acid 0.2414g (Li: Mn: B: carbon source = 1: 1: 1: 0.05 molar ratio) are added in the ball mill jar, after adding 20ml of acetone Grinding for 6 hours, drying the above slurry at 60°C to obtain a powder, in an argon atmosphere, raising the temperature to 250°C at a rate of 10°C / min for 3 hours of pre-calcination, grinding the precursor, and then raising the temperature at the same rate The temperature was raised to 500°C for 10 hours at a rate of 10°C / min (argon protection was required during this process). After naturally cooling down to room temperature, the obtained sample is a composite material of monoclinic manganese lithium borate and carbon (m-LiMnBO 3 C), the XRD diffraction pattern of the product is as follows figure 2 shown. It can be used as the pos...

Embodiment 3

[0039] Embodiment 3, the composite material (h-LiMnBO of hexagonal manganese borate lithium and carbon 3 C) Preparation

[0040] Add 0.3696g of lithium carbonate, 1.1495g of manganese carbonate, and 0.6183g of boric acid into the ball mill jar, then add 0.1207g of citric acid (Li:Mn:B:carbon source=1:1:1:0.05), and acetone is used as a dispersant , ball milled for 5 hours, dried the above slurry at 60°C to obtain a powder, in an argon atmosphere, heated up to 250°C at a heating rate of 10°C / min for 3h pre-calcination, ground the precursor, and then The heating rate is 10°C / min, and the temperature is raised to 750°C for 15 hours of calcination (argon protection is required during this process). After naturally cooling down to room temperature, the obtained sample is a composite material of hexagonal manganese lithium borate and carbon (h-LiMnBO 3 C), the XRD diffraction pattern of the product is as follows Figure 4 (d) shown. It can be used as the positive electrode activ...

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Abstract

The invention discloses a method for preparing a lithium ion battery cathode material in-situ carbon coated lithium manganese borate composite material. The method comprises the following steps of: grinding a lithium source, a manganese source, a boron source and a carbon source in a dispersed solvent in a ratio and uniformly mixing; drying slurry to obtain powder; and sintering the powder in a tube furnace to obtain a hexagonal or monocline composite material of lithium manganese borate and the carbon. A lithium ion battery pole piece which is made of the obtained composite material is used for assembling a battery and the obtained battery material has relatively higher discharge capacity and good cycle stability. In the invention, a solid phase method is adopted, the method is easy to operate, the energy consumption is low, the composite material can be manufactured in bulk and industrialization can be easily realized.

Description

technical field [0001] The invention relates to a preparation method of a hexagonal, monoclinic manganese-lithium borate composite material coated with carbon as a positive electrode material of a high-performance lithium ion battery, and belongs to the technical field of lithium ion batteries. Background technique [0002] The currently commercialized lithium-ion battery cathode materials include LiCoO 2 , LiMn 2 o 4 , LiNi x mn y co 1-x-y o 2 , LiFePO 4 Wait. With people's demand for high performance, high stability, and high energy density of lithium-ion batteries and considering the importance of limited resources and environmental protection, the recent LiMnBO 3 Due to the light atomic weight of boron, abundant reserves in the earth's crust, lower electronegativity compared with phosphorus, and environmental friendliness, boron-based compounds are good substitutes for lithium-ion battery cathode materials. . Legagneur first reported boron-containing compounds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 徐立强李寿丽陈婷婷
Owner SHANDONG UNIV
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