Lithium ion battery cathode material and method for preparing same

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large fluctuation range of tap density, poor electrical conductivity, complicated process, etc., to improve the tap density and volume specific capacity, Good electrical conductivity and uniform particle size distribution

Active Publication Date: 2012-08-15
湖南鸿跃新能源循环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium battery of this system has the following disadvantages: 1. The potential of the carbon negative electrode is very close to that of lithium. When the battery is overcharged, metal lithium may precipitate on the surface of the carbon electrode, forming lithium dendrites and causing safety problems; 2. Release energy The speed is not fast enough, it is not suitable for the requirement of instantaneous high current
[0004] But with lithium titanate Li 4 Ti 5 o 12 There are also two deficiencies in making lithium battery negative electrode materials: 1. High lithium intercalation potential ((1.55V vs. Li / Li + ) brings the low voltage of the lithium battery itself; 2. Poor conductivity (the inherent conductivity is 10 -9 S / cm), large current discharge is easy to produce large polarization
The disadvantages are: the addition of organic compounds increases the cost; during the sintering process, gelation into powder is a process of violent volume expansion, so the utilization rate of the reaction furnace is low; organic matter produces a large amount of CO during the sintering process 2 Gas; complex process, difficult to achieve large-scale industrial production
This patent is only a carbon-coating or doping modification on the lithium titanate material, but the tap density of the material is "0.7-1.5g / cm 3 "The fluctuation range is large, which will bring hidden dangers that are difficult to control in material processing for battery manufacturers.

Method used

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  • Lithium ion battery cathode material and method for preparing same
  • Lithium ion battery cathode material and method for preparing same
  • Lithium ion battery cathode material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Separately sieve the raw materials titanium dioxide, lithium carbonate, and magnesium oxide, and keep those ≤2 μm for later use. Weigh 766.7 grams of titanium dioxide, 301.5 grams of lithium carbonate, and 16.1 grams of magnesium oxide, add deionized water, and wet mill for 4 hours. Dry in vacuum at 110°C for 6 hours. Under the protection of nitrogen, the temperature of the material is raised to 650°C at a rate of 5-8°C / min, and the temperature is kept for 16 hours. Cool down to 80°C at 4-8°C / min and discharge. Then add 68.9 grams of glucose powder, ball mill for 4 hours and mix evenly. The material is put into a carbon-coated furnace, and under the protection of nitrogen, the temperature is raised to 850° C. at 5-8° C. / min, and the temperature is kept for 12 hours. Cool down to 80°C at 4-8°C / min and discharge. Ball mill and sieve the material to obtain magnesium-doped carbon-coated lithium titanate Li 4 Ti 4.8 Mg 0.2 o 12 product. The performance index of the m...

Embodiment 2

[0055] Separately sieve the raw materials titanium dioxide, aluminum oxide, and chromium oxide, and use those with a thickness of ≤2 μm for later use. Weigh 342.4 grams of lithium hydroxide monohydrate and add deionized water, after dissolving, add 766.7 grams of titanium dioxide, 15.2 grams of chromium oxide, 10.2 grams of aluminum oxide, and wet mill for 6 hours. Dry in vacuum at 120°C for 5 hours. Under the protection of nitrogen, the temperature of the material is raised to 750° C. at a rate of 5-8° C. / min, and the temperature is kept for 12 hours. Cool down to 80°C at 4-8°C / min and discharge. Then add 86.9 grams of sucrose (or lactose, the carbon content of lactose and sucrose is the same), ball mill for 6 hours and mix well, put the material into the carbon-coated furnace, under the protection of nitrogen, 5-8°C / min to heat up to 750°C, Keep warm for 16 hours. Cool down to 80°C at 4-8°C / min and discharge. Ball mill and sieve the material to obtain aluminum-chromium-d...

Embodiment 3

[0059] The raw materials titanium dioxide and vanadium pentoxide are graded separately, and the ones ≤2um are used for later use. Weigh 816.1 grams of lithium acetate and add it to deionized water. After dissolving, add 782.7 grams of titanium dioxide and 18.2 grams of vanadium pentoxide, and wet mill for 6 hours. Dry in vacuum at 100°C for 6 hours. Under the protection of nitrogen, the temperature of the material is raised to 720°C at a rate of 5-8°C / min, and the temperature is kept for 14 hours. Cool down to 80°C at 4-8°C / min and discharge. Then add 47.2 grams of lactose (or sucrose, the carbon content of lactose and sucrose is the same), ball mill for 6 hours and mix well, put the material into the carbon-coated furnace, under the protection of nitrogen, 5-8°C / min to heat up to 800°C, Keep warm for 16 hours. Cool down to 80°C at 4-8°C / min and discharge. Ball mill and sieve the material to obtain vanadium-doped and carbon-coated lithium titanate Li 4 Ti 4.9 V 0.1 o 1...

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Abstract

The invention discloses a novel composite carbon-coated lithium titanate doped cathode material and method for preparing the same, which belong to the technical field of lithium ion battery manufacture. The method includes: using a titanium source, a lithium source and additives as raw materials, adding deionized water for wet grinding, vacuum drying, primarily synthesizing at the high temperature of 650-750 DEG C for 12-16 hours, cooling to the room temperature, adding organic carbon source materials, well mixing, secondarily synthesizing and coating carbon at the high temperature of 750-850 DEG C for 12-16 hours, cooling to the temperature below 80 DEG C, and discharging to obtain composite carbon-coated lithium titanate doped material (Li4Ti (5-x)YxOi2 / C). The lithium titanate material made by doping synthesis and carbon coating synthesis has the advantages of high conductivity, high crystallization level, uniformity in granularity, excellent processing performance, fine electrochemical performance and the like, and completely meets the requirements of automobile power lithium batteries and accumulation lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to a high-performance spherical compound-doped carbon-coated lithium titanate (Li 4 Ti (5-x) Y x o 12 / C) Preparation method of material product and battery thereof. Background technique [0002] At present, in the widely used secondary lithium battery system, the negative electrode basically uses carbon (graphite) as the negative electrode material. The lithium battery of this system has the following disadvantages: 1. The potential of the carbon negative electrode is very close to that of lithium. When the battery is overcharged, metal lithium may precipitate on the surface of the carbon electrode, forming lithium dendrites and causing safety problems; 2. Release energy The speed is not fast enough, and it is not suitable for the requirements of instantaneous high current. [0003] The use of lithium titanate as the negative electrode material for secondary lithium b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/485
CPCY02E60/10
Inventor 曾小毛王家泳项立辉
Owner 湖南鸿跃新能源循环科技有限公司
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