Cathode material of lithium-ion secondary battery and method for preparing same

A technology for secondary batteries and positive electrode materials, which is applied in the field of positive electrode materials for lithium-ion secondary batteries and its preparation. It can solve the problem of the uniformity of material crystallization, the difficulty in precise control of particle shape and particle size distribution, and the violation of the sustainable development strategy. , many heat treatment steps, etc., to achieve good electrochemical performance, less steps, and uniform surface coating

Inactive Publication Date: 2009-12-23
CITIC GUOAN MENGGULI NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese Patent Application No. 03124282.0 has announced "Low-temperature Combustion Synthesis Method of Doped Lithium Nickel Oxide". Although the synthesis method has simple equipment, convenient operation and high specific capacity of the synthesized material, it utilizes nitrates and organic dyes. A large amount of NO will be produced in the process 2 and CO 2 Exhaust gas, pollutes the environment, and violates the sustainable development strategy
Although the material synthesized by this process has uniform particle size and high specific capacity, there is also NO in the synthesis process. 2 Exhaust gas emission, pollutes the environment, and at the same time, th

Method used

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  • Cathode material of lithium-ion secondary battery and method for preparing same
  • Cathode material of lithium-ion secondary battery and method for preparing same
  • Cathode material of lithium-ion secondary battery and method for preparing same

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Embodiment 1

[0038]The main preparation steps of this embodiment are:

[0039] a) Weigh the reaction raw material LiOH·H respectively according to the mole fraction ratio of Li:(Ni+Co):B is 1.03:0.97:0.03 2 O, Ni 0.8 co 0.2 (OH) 2 and H 3 BO 3 , for grinding and thorough mixing;

[0040] b) put the mixture obtained in step (a) into a flat-bottomed crucible, put it into a cylindrical high-temperature furnace that adopts electric heating, and heat it; The current heats up, and when the temperature reaches 500°C, keep it warm for pretreatment, and the pretreatment time is 5 hours; cool the flat-bottomed crucible to below 100°C with the furnace, take out the pre-burned raw materials, put them into a mortar and grind them again;

[0041] c) Put the raw material ground in step (b) into a rotary muffle furnace, heat up with a constant current, and feed oxygen at the same time, with a pressure of 1 standard atmosphere. When the temperature reaches 750°C, keep warm to carry out high-temperat...

Embodiment 2

[0046] The preparation step of this embodiment is the same as that of Example 1, except that the Ni 0.8 co 0.2 (OH) 2 Change to LiNi 0.8 co 0.2 o 2 , and LiOH·H 2 The amount of O is changed to H 3 BO 3 Half of the molar number of the dosage, the obtained boron-doped lithium nickel cobalt oxide material is LiNi 0.776 co 0.194 B 0.03 o 2 , and its scanning electron microscope image is as figure 1 Shown in b, its average particle diameter is basically the same as that of Example 1, and the X-ray diffraction pattern of this material is as figure 2 Shown in curve b. Use this cathode material to make a simulated battery to test its capacity and cycle performance, such as image 3 and Figure 4 As shown in the curve b, the first discharge specific capacity is 188.8mAh / g under the 3.0-4.3V, 0.5C rate charge and discharge system, and the capacity retention rate after 50 cycles at 1C rate is 93.3%.

Embodiment 3

[0048] The raw materials used in this embodiment are the same as in Example 1, except that the mol ratio of Li in step (1): (Ni+Co): B is changed to 1.03: 0.99: 0.01; the holding temperature in step (2) is changed to 400°C , the holding time was changed to 8h; the holding temperature in step (4) was changed to 800°C, and the holding time was 6h. Other steps were the same as in Example 1, and the positive electrode material prepared at last was LiNi 0.792 co 0.198 B 0.01 o 2 . Using this cathode material to make a simulated battery, its capacity and cycle performance are as follows: Figure 5 and Figure 6 As shown, the first discharge specific capacity is 187.5mAh / g under the 3.0-4.3V, 0.5C rate charge-discharge system, and the capacity retention rate after 50 cycles at 1C rate is 89%.

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Abstract

The invention provides a cathode material of a lithium-ion secondary battery and a method for preparing the same. The cathode material is a lithium nickel cobalt oxide material doped with a boron element. The preparation method comprises the following steps of: firstly, mixing compounds containing nickel, cobalt and lithium or a mixture consisting of various compounds and compounds containing boron or a mixture consisting of various compounds containing the boron according to a ratio; secondly, pretreating the mixture at a temperature of between 300 and 600 DEG C in an air atmosphere for 1 to 10 hours; thirdly, performing high-temperature synthesis on the mixture at a temperature of between 700 and 850 DEG C in an oxygen atmosphere for 3 to 15 hours; and finally, cooling the mixture to the room temperature, and then grinding and screening the mixture to obtain the lithium nickel cobalt oxide material doped with the boron element. The cathode material has the advantages of high specific capacity, good circulation property and good safety; the cathode material has the advantages of good crystallization property, uniform surface coating, narrow grain distribution and large packing density, so that the battery possesses good electrochemical property; and the preparation method has the advantages of simple production process, fewer steps, low energy consumption, no pollution, zero emission and the suitability for industrialized production.

Description

technical field [0001] The invention relates to the technical field of lithium ion secondary batteries, in particular to a positive electrode material for lithium ion secondary batteries with high cycle performance and a preparation method thereof. Background technique [0002] Since 1991, the lithium-ion battery made by SONY company with lithium cobalt oxide as the positive electrode was put on the market, because of its advantages such as high output voltage, high energy density, long cycle life and no memory effect, lithium-ion two Secondary batteries play an increasingly important role in people's daily life, and are widely used in mobile communications, notebook computers, electric vehicles, aerospace, biomedicine and other fields. With the advancement of science and technology, new positive electrode materials are constantly being introduced. The current commercialized lithium ion secondary battery positive electrode materials are mainly layered lithium cobaltate, laye...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01G1/02C01G53/00C01G51/00
CPCY02E60/12Y02E60/10
Inventor 侯宪全江卫军其鲁
Owner CITIC GUOAN MENGGULI NEW ENERGY TECH
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