Lithium manganese oxide-bismuth titanate material of power lithium battery and preparation method of lithium manganese oxide-bismuth titanate material

A technology of lithium manganese oxide and bismuth titanate, which is applied to battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of volume expansion and contraction, poor high-temperature cycle performance, and low discharge capacity, so as to overcome volume expansion and shrinkage, high-temperature cycle performance improvement, and easy control of the preparation process

Active Publication Date: 2017-10-10
湖南盛利高新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these lithium-ion battery cathode materials still have some defects, such as low discharge capacity, small gram capacity, unstable crystal form, poor reversibility, long charging time, etc.
Greatly limit the application of lithium-ion batteries in power batteries
Layered lithium manganese oxide (LiMnO 2 ) has a theoretical capacity of nearly 300mAh / g, superior electrical properties, wide sources, cheap price, good thermal stability, no hygroscopicity, and environmental friendliness. It is suitable for large-scale development and use, and is more suitable for electric vehicles with large-capacity requirements , but due to the transformation to the spinel structure after delithiation, repeated changes in the crystal structure can easily cause volume expansion and contraction, and the cycle stability is not good, especially the high temperature cycle performance is poor, it is easy to dissolve and lose, and it is difficult to withstand high-voltage charging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a method for preparing a manganese oxide lithium-bismuth titanate material for a power lithium battery, which includes the following steps:

[0024] Step 1: mixing manganese dioxide, trimanganese tetraoxide and lithium carbonate in a molar ratio of 1:0.2:1 to obtain a premix;

[0025] Step 2: 0.2mol / L bismuth nitrate pentahydrate and 0.15mol / L tetrabutyl titanate are dissolved in ethanol to prepare a bismuth titanate precursor solution; 0.1mol / L cetyltrimethylammonium bromide Adding to the above-mentioned bismuth titanate precursor solution and stirring until dissolved to obtain a mixed solution;

[0026] Step 3: 40 parts by weight of the premix prepared in step 1, 0.2 parts by weight of the crystal orientation inducer triclinic CuSO 4 And the reductant sodium thiosulfate of 0.5 weight part, in high-speed mixer with the speed of 2000rpm high-speed stirring dispersion 3-5min, then pump in the screw machine press, in triclinic CuSO 4 Under the i...

Embodiment 2

[0033] This embodiment provides a method for preparing a manganese oxide lithium-bismuth titanate material for a power lithium battery, which includes the following steps:

[0034] Step 1: mixing manganese dioxide, trimanganese tetraoxide and lithium carbonate in a molar ratio of 1:0.3:1 to obtain a premix;

[0035] Step 2: 0.2mol / L bismuth nitrate pentahydrate and 0.15mol / L tetrabutyl titanate are dissolved in ethanol to prepare a bismuth titanate precursor solution; 0.1mol / L cetyltrimethylammonium bromide Adding to the above-mentioned bismuth titanate precursor solution and stirring until dissolved to obtain a mixed solution;

[0036] Step 3: 40 parts by weight of the premix prepared in step 1, 0.2 parts by weight of the crystal orientation inducer triclinic CuSO 4 And the reductant sodium thiosulfate of 0.5 weight part, in high-speed mixer with the speed of 2000rpm high-speed stirring dispersion 3-5min, then pump in the screw machine press, in triclinic CuSO 4 Under the i...

Embodiment 3

[0043] This embodiment provides a method for preparing a manganese oxide lithium-bismuth titanate material for a power lithium battery, which includes the following steps:

[0044] Step 1: mixing manganese dioxide, trimanganese tetraoxide and lithium carbonate in a molar ratio of 1:0.4:1 to obtain a premix;

[0045] Step 2: 0.3mol / L bismuth nitrate pentahydrate and 0.25mol / L tetrabutyl titanate are dissolved in ethanol to prepare a bismuth titanate precursor solution; 0.2mol / L cetyltrimethylammonium bromide Adding to the above-mentioned bismuth titanate precursor solution and stirring until dissolved to obtain a mixed solution;

[0046] Step 3: 45 parts by weight of the premix prepared in step 1, 0.5 parts by weight of the crystal orientation inducer triclinic CuSO 4 And the reductant sodium thiosulfate of 0.8 weight part, in high-speed mixer with the speed of 2000rpm high-speed stirring dispersion 3-5min, then pump in the screw machine press, in triclinic CuSO 4 Under the i...

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Abstract

The invention provides a lithium manganese oxide-bismuth titanate material of a power lithium battery and a preparation method of the lithium manganese oxide-bismuth titanate material. The lithium manganese oxide-bismuth titanate material is of a layered sandwiched structure, wherein crystal grains of bismuth titanate are embedded among layered lithium manganese oxide. According to the preparation method, the lithium manganese oxide-bismuth titanate material with crystal grains embedded among layers is formed by crystal phase induction, cutting and high-electric field ion shaping of bismuth titanate and the layered lithium manganese oxide. In the lithium manganese oxide-bismuth titanate material, the bismuth titanate is grown among the layers of the lithium manganese oxide, the lithium manganese oxide is supported by a crystal framework of the bismuth titanate, a crystal lattice is prevented from being collapsed, the volume expansion and contraction is prevented, the high-temperature cycle property is substantially improved, and the lithium manganese oxide-bismuth titanate material is suitably used for the lithium power battery.

Description

technical field [0001] The invention belongs to the technical field of anode materials for lithium ion batteries, and relates to a lithium manganese oxide-bismuth titanate material for power lithium batteries and a preparation method thereof. Background technique [0002] The development and application of electric vehicles can effectively alleviate the energy crisis and environmental pollution. Lithium-ion batteries are considered to be the high-performance batteries that are most likely to meet the needs of electric vehicles and hybrid electric vehicles in today's society because of their high energy density, long service life, and many advantages such as no pollution to the environment. Lithium-ion battery is a new type of secondary energy storage battery developed in the 1990s. Due to the advantages of high energy, long life, low consumption, no pollution, no memory effect, small self-discharge, low internal resistance, high cost performance, and less pollution, it is w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆司文彬曾军堂
Owner 湖南盛利高新能源科技有限公司
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