Cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of insufficient cycle performance and rate performance of ternary materials, achieve excellent cycle performance and rate performance, promote commercialization, The effect of high crystallinity

Inactive Publication Date: 2014-12-31
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ternary materials still have shortcomings such as insufficient cycle performance and insufficient rate performance.

Method used

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  • Cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and preparation method thereof
  • Cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and preparation method thereof
  • Cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of gel: Weigh analytically pure CH according to the stoichiometric ratio (1.05:0.35:0.2:0.4:0.05). 3 COOLi·2H 2 O, Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O, Mn(CH 3 COO)·4H 2 O, Mg(NO 3 ) 2 ·6H 2 O, dissolve completely with deionized water respectively, add citric acid solution, the amount added is equal to the sum of molar amounts of transition metal ions, mix well, adjust the pH value to about 7 with concentrated ammonia water, heat in a water bath at 60°C and keep Stir until a dark purple gel is obtained;

[0023] (2) Burning: take the gel prepared in step (1) and heat and dry at 80°C for 8 hours, pre-burn the resulting product at 300°C for 4 hours, cool and grind, then calcinate at 700°C for 10 hours, cool and grind , to get the product LiNi 0.35 co 0.2 mn 0.4 Mg 0.05 o 2 Cathode material.

Embodiment 2

[0025] (1) Preparation of gel: Weigh analytically pure LiNO according to the stoichiometric ratio (1.05:0.3:0.2:0.4:0.1) 3 , Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 4H 2 O, Cu(NO 3 ) 2 ·3H 2 O, dissolve completely with deionized water respectively, add citric acid solution, the amount added is equal to the sum of molar amounts of transition metal ions, mix evenly, adjust the pH value to about 7.5 with concentrated ammonia water, heat in a water bath at 80°C and continuously Stir until a dark purple gel is obtained;

[0026] (2) Burning: Burning: Take the gel prepared in step (1) and heat and dry at 100°C for 10 hours, pre-burn the resulting 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 0.3 co 0.2 mn 0.4 Cu 0.1 o 2 Cathode material.

Embodiment 3

[0028] (1) Preparation of gel: Weigh analytically pure LiOH·H 2 O, Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 4H 2 O, Zn(NO 3 ) 2 ·6H 2 O, dissolve completely with deionized water, add citric acid solution, the amount is equal to the sum of the molar amounts of transition metal ions, mix well, adjust the pH value to about 8 with concentrated ammonia water, heat in a water bath at 90°C and keep Stir until a dark purple gel is obtained;

[0029] (2) Burning: 2) Burning: take the gel prepared in step (1) and heat and dry at 120°C for 12 hours, pre-burn the resulting product at 500°C for 6 hours, then cool and grind, and then calcined at 900°C Cool and grind after 18 hours to obtain the product LiNi 0.25 co 0.2 mn 0.4 Zn 0.15 o 2 Cathode material.

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Abstract

The invention relates to a cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and a preparation method thereof, which belong to the lithium ion battery field. A general chemical formula of the cathode material is LiNi0.4-xM1xCo0.2-yM2yMn0.4-zM3zO2, M1 is Mg, Zn or Cu; M2 is Al or Cr; M3 is Ti, Zr or Mo, x is greater than or equal to 0 and less than or equal to 0.15; y is greater than or equal to 0 and less than or equal to 0.15; and z is greater than or equal to 0 and less than or equal to 0.15. The preparation method comprises the following steps: weighing soluble lithium source, nickel source, manganese source, cobalt source and metal M1 salt, M2 salt and M3 salt according to mol ratio, respectively using deionized water for dissolving, adding a citric acid solution for uniformly mixing and stirring, using concentrated ammonia liquor to adjust pH value, and heating and evaporating to obtain gel, heating and drying the gel, performing twice calcination and grinding to obtain the cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material. The cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material has fine and uniform particles which can reach a nano level, and has high discharge capacity, excellent cycle stability and multiplying power performance, the performance can be kept under high low temperature condition, so that the ternary cathode material is convenient for large scale industrial production and has high practical degree.

Description

technical field [0001] The invention relates to a cation-doped and modified lithium-ion battery (4:4:2) type ternary cathode material and a preparation method thereof, belonging to the field of lithium-ion batteries. Background technique [0002] 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. However, cobalt is a rare metal, which is expensive and pollutes the environment to a certain extent. Therefore, people's research hotspots have turned to replace LiCoO with other transition metal compounds that are cheap and environmentally friendly. 2 Material. LiNiO 2 with LiCoO 2 The similar structure has a higher actual discharge capacity, and nickel reserves are much richer and cheaper than cobalt. However, its preparation is difficult, non-stoichiometric products are easily generated during the preparatio...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张海朗杨威张棪李红艳
Owner JIANGNAN UNIV
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