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Preparation method of lithium manganate composite material for lithium-ion battery

A lithium-ion battery and composite material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of irreversible capacity fading and fast capacity fading, and achieve good power storage capacity, excellent power storage performance, and stable unit cells configuration effect

Inactive Publication Date: 2018-04-20
宁波高新区锦众信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiMn 2 o 4 There are serious irreversible capacity fading and very fast capacity fading during deep charge and discharge when the material is cycled or stored at high temperature (55°C).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of silicon-doped lithium manganese oxide precursor

[0018] Dissolve analytically pure lithium oxalate and manganese chloride in absolute ethanol at a molar ratio of Li / Mn=1 / 2 to obtain a transparent solution; dilute and dissolve organosilane in ethanol to obtain a dilute solution of a specific concentration; then add to Li, In the mixed solution of Mn, according to the ratio of Li:Mn:Si=1:1.9:0.1 in molar ratio, organic silane solution is added under stirring, and a transparent solution is obtained after mixing evenly. Then under the infrared lamp, heat and gradually remove the solvent, and dry to form a white gel precursor; the obtained precursor is heated to 400°C at a heating rate of 10°C / min and kept for 5 hours, so that the raw materials are pre-decomposed into Li, Mn, The amorphous mixed oxide of Si is naturally cooled to room temperature, taken out and ground sufficiently to obtain the silicon-doped lithium manganate precursor.

[0019] Preparation ...

Embodiment 2

[0024] Preparation of silicon-doped lithium manganese oxide precursor

[0025] Dissolve analytically pure lithium oxalate and manganese chloride in absolute ethanol at a molar ratio of Li / Mn=1 / 2 to obtain a transparent solution; dilute and dissolve organosilane in ethanol to obtain a dilute solution of a specific concentration; then add to Li, In the Mn mixed solution, according to the ratio of molar ratio Li:Mn:Si=1:1.75:0.25, organic silane solution is added under stirring, and a transparent solution is obtained after mixing evenly. Then, under the infrared lamp, heat and gradually remove the solvent, and dry to form a white gel precursor; the obtained precursor is heated to 600°C at a heating rate of 15°C / min and kept for 5 hours, so that the raw materials are pre-decomposed into Li, Mn, The amorphous mixed oxide of Si is naturally cooled to room temperature, taken out and ground sufficiently to obtain the silicon-doped lithium manganate precursor.

[0026] Preparation of ...

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Abstract

The invention discloses a preparation method of a lithium manganate composite material for a lithium-ion battery. The preparation method comprises the following steps: (1) preparing a silicon-doped lithium manganate precursor; (2) preparing a bismuth sodium titanate ceramic-doped porous carbon material; (3) mechanically mixing the porous carbon and the precursor according to the ratio that the mass ratio of carbon to silicon ranges from (3 to 1) to (1 to 3); then mixing a mixture with a formaldehyde solution containing phenol-formaldehyde resin; then carrying out pyrolysis under an inert atmosphere, wherein the pyrolysis temperature is 800 to 1000 DEG C and the pyrolysis time is 5 to 8 hours; after pyrolyzing, uniformly mixing a product through ball milling and then heating in a tubular furnace under the conditions that the heating temperature is 1200 to 1500 DEG C and the heating time is 1 to 2h, so as to prepare the porous carbon covered silicon-doped lithium manganate composite material. The lithium manganate composite material disclosed by the invention has high specific capacity and relatively long service life.

Description

Technical field [0001] The invention relates to a preparation method of a lithium manganate composite material for a lithium ion battery. Background technique [0002] With the advancement of science and technology, people's demand for mobile energy is becoming stronger and stronger, especially for pure electric vehicles. With the aggravation of the oil and environmental crisis, the demand is continuously strengthened. At present, whether it can break through the low-cost, safe, environment-friendly, and superior-performance secondary chemical power supply technology has become a bottleneck restricting the development of pure electric vehicles. Since the advent of lithium-ion batteries in the early 1990s, they have been considered ideal for high-capacity and high-power batteries because of their high energy density, good cycle performance and charge retention. At present, the positive and negative electrode materials mainly used in lithium-ion batteries are lithium intercal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 蒋玛丽
Owner 宁波高新区锦众信息科技有限公司
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