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A kind of cathode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor electrical conductivity and unsatisfactory high-rate charge-discharge performance, and achieve excellent performance, excellent high-rate charge-discharge performance, The effect of structural stability

Active Publication Date: 2014-10-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems of poor electrical conductivity and unsatisfactory high-rate charge-discharge performance of silicate-based cathode materials in the prior art

Method used

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  • A kind of cathode material of lithium ion battery and preparation method thereof
  • A kind of cathode material of lithium ion battery and preparation method thereof
  • A kind of cathode material of lithium ion battery and preparation method thereof

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preparation example Construction

[0031] The present invention also provides a preparation method for the above positive electrode material, comprising the following steps:

[0032] Step 1. Mix and ball mill lithium source, M source, silicon source and N source to obtain mixed powder;

[0033] Step 2, the above-mentioned mixed powder is heat-treated under an inert atmosphere to obtain a structural formula of Li 2+x MSi 1-x N x o 4 The product, wherein, M is selected from Mn, Fe or Mn 1-y Fe y , N is selected from Ti, Cr or Ti 1-z Cr z , 0.01

[0034] The process of the above preparation method is simple, and at the same time, the prepared material has excellent performance, stable structure, and high-rate charge-discharge performance, and the prepared positive electrode material is a nano-particle material with a uniform particle size distribution, and the average particle size distribution is between 50-100 Between nanometers, the crystal form is perfect.

[0035] In the present ...

Embodiment 1

[0046] (1) Preparation of cathode materials

[0047] 1) Weigh 92.5g of lithium carbonate, 30g of fumed silica, 57.5g of manganese carbonate, 90g of ferrous oxalate, 40g of titanium dioxide and 5g of sucrose, mix them in 500ml of ethanol, and then use a planetary ball mill at a speed of 300r / min Ball milling for 5 hours; 2) The ball-milled mixed powder was roasted and heat-treated in a box-type atmosphere furnace. Under the protection of an Ar atmosphere with a flow rate of 0.6l / min, the temperature was raised to 350°C at a heating rate of 5°C / min. Keep it warm for 10 hours, then raise the temperature to 850°C at a heating rate of 8°C / min, keep it at this temperature for 8h, and then cool it to room temperature with the furnace to obtain a carbon-coated Li 2.5 mn 0.5 Fe 0.5 Si 0.5 Ti 0.5 o 4 active material;

[0048] Adopt Rigaku D / MAX2200PC X-ray diffractometer (room temperature 25°C, radiation source is Cu target Kα ray, tube voltage 40kV, tube current 20 mA, scanning r...

Embodiment 2

[0053] Adopt the same method as Example 1 to prepare the positive electrode material and simulated battery, the difference is that the raw materials added are lithium oxalate 112.1g, nano silicon dioxide 48g, manganese oxalate 28.6g, ferrous chloride 101.4g, chromium trioxide 20g and Glucose 6g, to prepare Li 2.2 mn 0.2 Fe 0.8 Si 0.8 Cr 0.2 o 4 Active material, and made CR2016 button battery A2.

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Abstract

The invention provides a positive electrode material for a lithium ion battery, the positive electrode material comprises a positive electrode active material, the structural formula of the positive electrode active material is Li2+xMSi1-xNxO4, wherein, M is selected from Mn, Fe or Mn1-yFey, N Selected from Ti, Cr or Ti1-zCrz, 0.01<x≤0.5, 0<y<1, 0<z<1. At the same time, the present invention also provides a preparation method of the above positive electrode material. The preparation method of the present invention has a simple process, and the prepared positive electrode material has excellent performance, stable structure, high specific capacity, coulombic efficiency and good cycle performance, and also has excellent high rate charge and discharge performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, more specifically, to a positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Since the advent of lithium-ion batteries in the 1990s, due to their high energy density, high power density and good cycle performance, they have been widely used in mobile communications, notebook computers, cameras, cameras, portable instruments and other fields. The first choice of supporting power for electric vehicles and space power, which are vigorously researched by various countries, has become the first choice for alternative energy. [0003] Lithium-ion battery cathode material is one of the key materials that determine the performance of lithium-ion batteries. 2 , but due to the scarcity of cobalt resources, the production cost of the battery is too high, and it has certain toxicity and will pollute the environment. There is a serious safe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/136H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 袁学远胡栋杰
Owner BYD CO LTD
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