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Boron-doped lithium nickel cobaltate anode material

A lithium nickel cobalt oxide and positive electrode material technology, which is applied in the direction of electrical components, battery electrodes, nickel compounds, etc., can solve the problem of the uniformity of material crystallization, the difficulty of precise control of particle shape and particle size distribution, increased energy consumption, exhaust gas emissions, etc. problems, to achieve the effect of improving the first discharge efficiency, improving electrochemical performance, and improving structural stability

Inactive Publication Date: 2011-05-11
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 nitrate and organic dyes. A lot 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, pollute the environment, at the same time, there are many heat treatment steps in the material synthesis process, which increases energy consumption
Patent application No. 200510019552.8 published "Doped and Surface Coated Lithium Cobalt Oxide Cathode Material and Its Preparation Method", using traditional solid-state reaction to synthesize doped and surface-coated lithium cobalt oxide cathode material. Although the process is simple, the traditional The defects of the solid state reaction, such as the uniformity of material crystallization, particle shape and particle size distribution, are difficult to accurately control, and three times of heating and heat preservation are required, which increases the production cost

Method used

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  • Boron-doped lithium nickel cobaltate anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh the reaction material LiOH·H respectively according to the ratio of Li:(Ni+Co):B molar ratio of 1.03:0.97:0.03 2 O. Nio 0.8 co 0.2 (OH) 2 and H 3 BO 3 , for thorough mixing of grinding;

[0033] 2) Put the above mixture into a flat-bottomed crucible, heat it in an electrically heated cylindrical high-temperature furnace, use a blower to continuously blow air into the high-temperature furnace, keep the air pressure at 1 standard atmospheric pressure, and heat up with a constant current. When the temperature rises to 500 ℃, keep warm for pretreatment, and the pretreatment time is 5 hours; cool the flat-bottomed crucible to below 100℃ with the furnace, take out the pre-burned raw materials, put them into the mortar and grind again;

[0034] 3) Put the above-mentioned ground raw materials into a rotary muffle furnace, heat up with a constant current, and at the same time feed oxygen, the pressure is 1 standard atmospheric pressure, the temperature rises to 750...

Embodiment 2

[0039] The preparation process 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 the number of moles used.

[0040] The resulting product is LiNi 0.776 co 0.194 B 0.03 o 2 , where the X-ray diffraction pattern is as image 3 Shown in b in, take the synthetic product of above-mentioned preparation method to be spherical (see figure 2 ), the average particle size is 8μm, and the tap density is 2.5g / cm3. After making a simulated battery, test its capacity and cycle performance, such as Figure 4 and Figure 5 As shown in the curve b, under the 3.0-4.3V, 0.5C rate charge and discharge system, the discharge specific capacity is 188.8mAh / g, and the capacity retention rate after 50 cycles under the 1C rate charge and discharge system is 93.3%.

Embodiment 3

[0042] The raw materials used in this embodiment are the same as in Example 1, and the operation steps are slightly changed:

[0043] Li in step 1): (Ni+Co): the mol ratio of B is changed into 1.03: 0.99: 0.01;

[0044] The heat preservation temperature in step 2) was changed to 400° C. for 8 hours;

[0045] The heat preservation temperature in step 4) was changed to 800° C. for 6 hours.

[0046] The resulting product is LiNi 0.792 co 0.198 B 0.01 o 2 , use this material to make a simulated battery and test its capacity and cycle performance, such as Figure 6 and Figure 7 As shown in the curve b, under the 3.0-4.3V, 0.5C rate charge and discharge system, the discharge specific capacity is 187.5mAh / g, and the capacity retention rate is 89% after 50 cycles under the 1C rate charge and discharge system.

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Abstract

The invention relates to a boron-doped lithium nickel cobaltate anode material. The chemical formula of the boron-doped lithium nickel cobaltate anode material is LiNiXCoYBZO2, wherein 0.7<X<0.9, 0.1<Y<0.3, 0<Z<0.1, and X+Y+Z=1. The preparation method of the boron-doped lithium nickel cobaltate anode material comprises the following steps: 1. proportionally mixing a compound containing nickel, cobalt and lithium and a compound containing boron; 2. in an air atmosphere, pretreating at 300-600 DEG C for 1-10 hours; 3. in an oxygen atmosphere, synthesizing at the high temperature of 700-850 DEG C for 3-15 hours; and 4. cooling to normal temperature, pulverizing, and screening to obtain the final product. In the boron-doped lithium nickel cobaltate anode material provided by the invention, boron is used instead of metal doping ions, thereby enhancing the first capacity, first discharging efficiency, cycle performance and safety of the material; and the method provided by the invention has the advantages of simple production technique, fewer steps, short production time, low energy consumption, no pollution and zero discharge, thereby being very suitable for industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a boron-doped lithium nickel cobalt oxide cathode material for the lithium ion battery. Background technique [0002] Since 1991, SONY’s battery made of lithium cobaltate as the positive electrode was put on the market, it has the advantages of high energy density, long cycle life and no memory effect. Lithium-ion secondary batteries have high output voltage in the Occupying an increasingly important position in people's daily life, it has been widely used in fields such as mobile communications, notebook computers, electric vehicles, aerospace, and biomedicine. With the advancement of science and technology, new positive electrode materials are constantly emerging. The current commercialized lithium ion secondary battery positive electrode materials are mainly layered lithium cobalt oxide, layered lithium nickel oxide and spinel lithium manganese oxide. Although lithium cobaltate is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485
CPCY02E60/10
Inventor 王雅和刘建红张重德葛焕增毛永志
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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