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Anion doped modified lithium ion battery (4:4:2) type ternary cathode material and preparing method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve environmental pollution, expensive and other problems, and achieve the effects of cost reduction, cheap price, and stable material structure

Inactive Publication Date: 2014-07-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cobalt is a rare metal, which is expensive and pollutes the environment to a certain extent.

Method used

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  • Anion doped modified lithium ion battery (4:4:2) type ternary cathode material and preparing method thereof
  • Anion doped modified lithium ion battery (4:4:2) type ternary cathode material and preparing method thereof
  • Anion doped modified lithium ion battery (4:4:2) type ternary cathode material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of gel: Weigh analytically pure CH according to the stoichiometric ratio (1.05: 0.4: 0.2: 0.4: 0.03) 3 COOLi, Ni(CH 3 COO) 2 , Co(CH 3 COO) 2 , Mn(CH 3 COO) 2 , LiCl, respectively, completely dissolved in deionized water, add citric acid solution, the added amount is equal to the sum of the molar amounts of transition metal ions, after mixing uniformly, adjust the pH value to about 7 with concentrated ammonia water, and heat it in a water bath at 60℃. Keep stirring until you get a dark purple gel;

[0024] (2) Burning: Take the gel prepared in step (1) and heat and dry it at 80°C for 8 hours, pre-burn the product at 300°C for 4 hours and then cool and grind, then calcinate at 700°C for 10 hours and then cool and grind , Get the product LiNi 0.4 Co 0.2 Mn 0.4 O 1.97 Cl 0.03 Cathode material.

Embodiment 2

[0026] (1) Preparation of gel: Weigh out analytically pure LiNO according to the stoichiometric ratio (1.05:0.4:0.2:0.4:0.05) 3 , Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 , LiCl, respectively, completely dissolved in deionized water, add citric acid solution, the added amount is equal to the sum of the molar amounts of transition metal ions, after mixing uniformly, adjust the PH value to about 7.5 with concentrated ammonia water, and heat it in a water bath at 80°C. Keep stirring until you get a dark purple gel;

[0027] (2) Burning: Burning: take the gel prepared in step (1) and heat and dry it at 100°C for 10 hours, pre-burn the product at 400°C for 5 hours, cool and grind, and then calcinate at 850°C for 15 hours After cooling and grinding, the product LiNi is obtained 0.4 Co 0.2 Mn 0.4 O 1.95 Cl 0.05 Cathode material.

Embodiment 3

[0029] (1) Preparation of gel: Weigh analytically pure LiOH and NiSO according to the stoichiometric ratio (1.05:0.4:0.2:0.4:0.15) 4 , CoSO 4 , MnSO 4 , LiCl, respectively, completely dissolved in deionized water, add citric acid solution, the input amount is equal to the sum of the molar amounts of transition metal ions, after mixing, adjust the PH value to about 8 with concentrated ammonia water, and heat it in a water bath at 90℃. Keep stirring until you get a dark purple gel;

[0030] (2) Burning: 2) Burning: Take the gel prepared in step (1) and heat and dry it at 120°C for 12 hours. The resulting product is pre-burned at 500°C for 6 hours, then cooled and ground, and then calcined at 900°C After 18 hours, cool and grind to get the product LiNi 0.4 Co 0.2 Mn 0.4 O 1.85 Cl 0.15 Cathode material.

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Abstract

The invention relates to an anion doped modified lithium ion battery (4:4:2) type ternary cathode material and a preparing method thereof, and belongs to the field of lithium ion batteries. The general chemical formula of the cathode material is LiNi<0.4>Co<0.2>Mn<0.4>O<2-z>Xz, wherein the X is F, Cl or Br; and the Z is more than 0 and not more than 0.15. The method includes steps of: weighing a soluble lithium salt, a nickel salt, a manganese slat, a cobalt salt and an X salt according to a molar ratio, dissolving the weighed compounds separately with deionized water, adding a citric acid solution and mixing and stirring uniformly, adjusting the pH value by utilization of concentrated ammonia liquor, heating and evaporating to obtain gel, heating and drying the gel, and performing two times of firing and grinding to obtain the anion doped modified lithium ion battery (4:4:2) type ternary cathode material. Particles of the lithium ion battery cathode material are fine and uniform and reach the nanometer level, so that the cathode material has characteristics of high discharge capacity, excellent cyclic stability and rate capacity, capability of maintaining the properties at high or low temperature conditions, convenience for large-scale industrial production, and high practical degree.

Description

Technical field [0001] The invention relates to an anion-doped modified lithium ion battery (4:4:2) type ternary positive electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. Background technique [0002] At present, with the development of digital products and electric vehicles, research on high-energy lithium-ion rechargeable secondary batteries has become a hot topic. As the most important link in determining the performance and cost of lithium-ion batteries, lithium-ion battery cathode materials have become the focus of research. Currently, LiCoO 2 Because of its high working voltage, large capacity, stable discharge, suitable for high current discharge and good cycle performance, it has become the most widely used cathode material in commerce. But cobalt is a rare metal, which is expensive and has certain pollution to the environment. Therefore, people’s research focus has turned to replacing LiCoO with other transition me...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张海朗杨威
Owner JIANGNAN UNIV
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