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Method for preparing lithium ferrous silicate or carbon ferrous silicate cathode material for lithium ion battery

A technology for lithium ferrous silicate and lithium-ion batteries, which is applied in the direction of battery electrodes, silicates, alkali metal silicates, etc., can solve the problems of uneven particle size, low purity of lithium ferrous silicate/carbon composite materials, and battery life. Solve problems such as poor chemical cycle stability, achieve high energy density, good cycle stability, and high practical value

Inactive Publication Date: 2012-09-12
HARBIN INST OF TECH
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low purity, inhomogeneous particle size and poor electrochemical cycle stability in existing prepared lithium ferrous silicate / carbon composite materials, and provide a lithium ferrous silicate for lithium ion batteries Preparation method of carbon cathode material

Method used

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specific Embodiment approach 1

[0008] Embodiment 1: This embodiment is a preparation method of lithium ferrous silicate / carbon positive electrode material for lithium ion batteries, which is specifically completed according to the following steps:

[0009] 1. Weighing materials: First, weigh lithium salt, ferrous salt and nano silicon dioxide according to the molar ratio of Li:Fe:Si (1.9~2.1):(0.95~1.05):1, and then weigh lithium source, iron source and 1% to 30% of the total mass of nano-silica to weigh the organic carbon source; 2. Dispersion: use deionized water or water-ethanol solution as the dispersion medium, and use the ball milling method or ultrasonic dispersion method to weigh the lithium in step 1 Salt, ferrous salt, nano silicon dioxide and organic carbon source are dispersed in deionized water or water-ethanol solution, and the dispersion time is 0.5h to 3h to obtain a mixed solution; 3. The mixed solution is dried by spray drying method, That is, the precursor powder is obtained; 4. Heat trea...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the lithium salt compound described in step one is selected from lithium silicate, lithium metasilicate, lithium carbonate, lithium hydroxide, lithium oxalate, lithium acetate, Lithium chloride, lithium nitrate and lithium phosphate. Others are the same as the first embodiment.

specific Embodiment approach 3

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the iron salt compound in step 1 is selected from ferrous oxalate, ferrous acetate, ferrous chloride and ferrous phosphate. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing a lithium ferrous silicate or carbon ferrous silicate cathode material for a lithium ion battery, relates to a method for preparing a cathode material for a lithium ion battery and aims to solve the problems that the conventional prepared lithium ferrous silicate or carbon ferrous silicate composite is low in purity, inhomogeneous in granularity, and poor in electrochemical cycling stability. The method comprises the following steps of: 1, weighing a lithium salt compound, a ferric salt compound, a nano silica and a carbon source compound; 2, dispersing the weighed materials in the step 1 into a dispersing agent by a ball mill or ultrasonic dispersion method to obtain mixed liquor; 3, drying the mixed liquor by a spray drying method to obtain precursor powder; and 4, heating, namely heating the precursor powder obtained in the step 3 under the protection of inert gas in a certain flow rate, cooling naturally to room temperature, and thus obtaining the lithium ferrous silicate or carbon ferrous silicate cathode material for the lithium ion battery. The method is mainly applied to preparation of the lithium ferrous silicate or carbon ferrous silicate cathode material for the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a cathode material for a lithium ion battery. Background technique [0002] With the progress of human society and the development of science and technology, human beings are faced with two major problems. One is the decreasing of non-renewable resources such as coal, oil and natural gas; Therefore, it is imminent to develop new energy technologies that are pollution-free and pollution-free. Since the industrialization of lithium-ion batteries based on lithium cobalt oxide positive electrodes, lithium-ion batteries have attracted widespread attention from all over the world due to their advantages such as high energy density, high discharge voltage, large specific capacity, low self-discharge rate, no memory effect and no pollution. . The iron-based cathode materials developed in recent years have also been extensively studied due to their advantages of abundant resources, low price, non-toxicity, envi...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397C01B33/32
CPCY02E60/10
Inventor 左朋建程广玉尹鸽平杜春雨程新群马玉林王振波
Owner HARBIN INST OF TECH
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