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Positive electrode material for lithium ion cell and synthesizing method thereof

A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve problems such as unfavorable industrial applications, and achieve the effects of easy industrial scale production, complete crystal structure, and convenient and easy-to-obtain raw materials.

Inactive Publication Date: 2004-06-30
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

W.Li et al [J.Electrochem.Soc., Vol.144, 2773-2779, 1997] used LiOH·H 2 O, Ni(OH) 2 、Co 2 o 3 The raw material is calcined with oxygen to obtain LiNi with better electrochemical performance. 0.8 co 0.2 o 2 However, in order to promote the growth of crystal grains in the preparation process, a flux is added, and finally the decomposition products of the flux must be washed away, which is not conducive to industrial applications.

Method used

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  • Positive electrode material for lithium ion cell and synthesizing method thereof
  • Positive electrode material for lithium ion cell and synthesizing method thereof
  • Positive electrode material for lithium ion cell and synthesizing method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] Synthesis of cathode material LiNi 0.8 co 0.2 o 2

[0027] 0.58mol of LiOH·H 2 O(AR) and 0.5mol LiNO 3 (AR) was placed in an agate mortar and ground carefully, and 0.8mol of Ni(OH) 2 (Containing Ni is 61.35%) and 0.2mol of Co 2 o 3 (CA) Grind evenly in an agate mortar, then mix the two mixtures together and grind evenly to form a mixed powder. Baking the mixed powder in an air environment of 630°C for 7 hours, taking it out and cooling to room temperature, grinding the sintered mixture into powder particles, and then returning to the furnace at a heating rate of 250°C / hour to about 750°C and roasting for 15 hours , while passing oxygen, the flow rate of oxygen is kept stable and controlled at 25ml / min. After the calcination, it is naturally cooled to below 450°C with the furnace to stop the flow of oxygen. After continuing to cool to room temperature, it is taken out for grinding. Analytical characterization and electrochemical test results such as figure 1 , ...

Embodiment 2

[0033] Synthesis of cadmium-containing lithium nickel cobalt oxide cathode material Li x Ni 0.8-y co 0.2 Cd y o p

[0034] With Cd-containing spherical Ni(OH) 2 (Containing Ni is 59.45%, Cd is 3.15%) to replace Ni(OH) in Example 1 2 , other process conditions are consistent with embodiment 1. The chemical composition of the synthesized material is analyzed by ICP-AES, and the actual metering formula of the measured material is: Li 1.06 Ni 0.74 co 0.19 Cd 0.02 o 2.04 . Other analytical characterization and electrochemical test results such as Figure 4 , 5 and 6, and related data are listed in Table-2.

[0035] Table 2:

[0036] I 003 / I 104 : 1.40 Initial discharge specific capacity: 157.8mAh / g

[0037] Particle size: 200~700nm First Coulombic efficiency: 87.1%

[0038] Capacity retention rate: 91%

Embodiment 3

[0040] Synthesis of zinc-containing lithium-nickel-cobalt composite oxide cathode material LixNi 0.8-y co 0.2 Zn y o p

[0041] 0.65mol of LiOH·H 2 O(AR) and 0.5mol LiNO 3 (AR) Grind finely in an agate mortar. In addition, 0.8mol of high-density Zn-containing Ni(OH) 2 (containing 60.03% Ni, 4.14% Zn) and 0.2mol of Co 2 o 3 (CA) Ball milled in a planetary ball mill for 3 hours to make it evenly mixed. Then mix the two mixtures together and grind until smooth. Roast the uniformly ground mixture for 6 hours at 650°C in an air environment, take it out and cool it to room temperature, grind the sintered mixture into powder particles, and then return to the furnace to increase the temperature to 750°C at a rate of 250°C / hour Left and right roasting for 16 hours, while passing oxygen, the oxygen flow rate is kept stable and controlled at 15ml / min. After the calcination is finished, use program control to lower the temperature to below 500°C, stop the oxygen flow, continue ...

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Abstract

In the invention, chemical general expression of positive pole material is: LixNi0.8-y Co0.2MyOp, where M is Cd or Zn, X=0.97-1.2, Y=0-0.1, p=2-2(1+y). The material is synthesized through following steps: (1) grinding, mixing compound of lithium, compound of cobalt, and compound of nickel containing a small quantity of cadmium or zinc, or containing none cadmium and zinc in certain scale evenly; (2) preroasting mixed powers makes it crystallize partially; (3) careful grinding preroasted mixture evenly, then roasting is carried out right along under higher temperature, and obtaining the invented material of positive pole after cooling. The invention possesses advantages of high specific capacity of the material, good performances of charging and discharging cycle, even size of granule, and narrow distribution range as well as simple preparation technique.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a positive electrode material of the lithium ion battery and a synthesis method thereof. Background technique [0002] LiNiO 2 with LiCoO 2 The same structure: α-NaFeO2-like structure, which belongs to the R-3m space group, and has a similar theoretical capacity of 275mAh / g. LiNiO 2 Due to the advantages of high capacity, high power, moderate price, etc., LiCoO has re-emerged in recent years. 2 It is a hot spot in the research of alternative materials, but there are still problems such as difficult synthesis, fast cycle capacity decay, poor thermal stability, etc., and the process of practical application has been slow. Various approaches are now employed to improve LiNiO 2 The comprehensive properties of LiNiO 2 The solid solution LiNi formed after doping Co element in 1-y co y o 2 received the most attention from researchers. Solid solution LiNi 1-y co y o 2 Combining the a...

Claims

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Application Information

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IPC IPC(8): C01D15/02H01M4/02H01M4/04H01M4/48H01M4/52H01M4/58H01M10/36
CPCY02E60/122H01M2004/028H01M4/525H01M4/131H01M10/052H01M4/1391Y02E60/10
Inventor 于作龙袁荣忠瞿美臻
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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