Preparation method of lithium-rich layered positive electrode material coated with lithium silicate for lithium ion battery

A technology for ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., to achieve the effects of easy control of reaction conditions, simple synthesis process and low cost

Active Publication Date: 2016-11-30
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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Problems solved by technology

However, due to the limitations of synthetic methods, no one has reported

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  • Preparation method of lithium-rich layered positive electrode material coated with lithium silicate for lithium ion battery
  • Preparation method of lithium-rich layered positive electrode material coated with lithium silicate for lithium ion battery
  • Preparation method of lithium-rich layered positive electrode material coated with lithium silicate for lithium ion battery

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preparation example Construction

[0015] The preparation method of the lithium-silicate-coated lithium-ion battery lithium-rich layered cathode material proposed by the present invention comprises the following steps:

[0016] (1) Preparation of oxalate precursor:

[0017] According to the molar ratio NiSO 4 , MnSO 4 Dissolve in 50ml of water so that the molar concentration of metal Ni ions and metal Mn ions is both 2mol / L to obtain a mixed solution of metal ions, and then configure NaC with a molar concentration of 2mol / L 2 o 4 Solution 50mL, under magnetic stirring, NaC 2 o 4 The solution was added to the mixed solution of metal ions to produce a precipitate. After stirring for 2 hours, it was centrifuged, and the precipitate was washed twice with deionized water and absolute ethanol respectively. The precipitate was dried in an oven at 70°C for 12 hours to obtain the Salt precursor, the molecular formula of oxalate precursor is: Ni0.35Mn0.65C 2 o 4 2H 2 O;

[0018] (2) SiO 2 Preparation of coated ...

Embodiment 1

[0024] (1) Preparation of oxalate precursor: mix NiSO 4 , MnSO 4 Dissolve in 50ml of water so that the molar concentration of metal Ni ions and metal Mn ions are both 2mol / L, and then configure 2mol / L NaC 2 o 4 Solution 50mL, under magnetic stirring, NaC 2 o 4 The solution was added to the mixed solution of metal ions, and a large amount of precipitation was produced immediately. After stirring for 2 hours, centrifuged, washed twice with deionized water and absolute ethanol, and dried in a 70-degree oven for 12 hours, the oxalate precursor was obtained. body;

[0025] (2) SiO 2 Synthesis of coated oxalate precursor: Weigh 1.2 mmol of the above-obtained oxalate precursor and disperse it in 13 ml of absolute ethanol, stir and ultrasonically disperse. According to the molar ratio of Si:(Ni+Mn)=3:100, Si(OC 2 h 5 ) 4 Anhydrous ethanol solution, stir to disperse evenly. Then the mixed solution was transferred to a thoroughly dry polytetrafluoroethylene-lined hydrothermal ...

Embodiment 2

[0029] (1) Preparation of oxalate precursor: a certain amount of NiSO 4 , MnSO 4 Dissolve in 50ml of water so that the molar concentration of metal Ni ions and metal Mn ions are both 2mol / L, and then configure 2mol / L NaC 2 o 4 Solution 50mL, under magnetic stirring, NaC 2 o 4 The solution was added to the mixed solution of metal ions, and a large amount of precipitation was produced immediately. After stirring for 2 hours, centrifuged, washed twice with deionized water and absolute ethanol, and dried in a 70-degree oven for 12 hours, the oxalate precursor was obtained. body;

[0030] (2) SiO 2 Synthesis of coated oxalate precursor: Weigh 1.2 mmol of the above-obtained oxalate precursor and disperse it in 13 ml of absolute ethanol, stir and ultrasonically disperse. According to the molar ratio of Si:(Ni+Mn)=3:100, Si(OC 2 h 5 ) 4 Anhydrous ethanol solution, stir to disperse evenly. Then the mixed solution was transferred to a thoroughly dry polytetrafluoroethylene-lin...

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Abstract

The invention relates to a preparation method of a lithium metasilicate coated lithium-enriched laminar positive electrode material of a lithium ion battery, belonging to the technical field of inorganic materials. According to the method, the lithium metasilicate coated lithium-enriched laminar positive electrode material is prepared by simple co-precipitation, and hydrothermal and high-temperature solid-phase sintering reaction. According to the method, the synthesis process is simple, the production efficiency is high and large-scale production is facilitated. According to the method, raw materials for reactants are easily available, have no toxin and are low in cost; a production process does not need special protection and reaction conditions are easy to control; and the obtained product has the advantages of large output, good result repeatability and the like. Compared with an uncoated material, the lithium metasilicate coated lithium-enriched laminar positive electrode material prepared by the method has the great improvement in the aspects of electrochemical performances including battery specific capacity, cycling stability, multiplying power and the like.

Description

technical field [0001] The invention relates to a preparation method of a lithium-rich layered positive electrode material coated with lithium silicate for a lithium-ion battery, and belongs to the technical field of inorganic materials. Background technique [0002] The increasingly serious world environmental pollution and the sharp shortage of non-renewable resources such as fossils make the development of new energy all the more important. As a new generation of energy storage system, lithium-ion batteries have attracted much attention due to their advantages of high efficiency, cleanliness, and high energy density, and have been widely used in the field of microelectronic products such as mobile phones, notebook computers, and digital cameras. However, the specific capacity, energy density and safety of lithium-ion batteries cannot meet the needs of the development of electric vehicles, and the main bottleneck limiting the energy density of lithium-ion batteries is the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 刘向峰肖小玲赵恩岳胡中波
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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