Method of synthetizing lithium ion cell positive electrode material through solution burning

A technology for lithium ion batteries and cathode materials, which is applied in the field of preparation of energy functional materials, can solve the problems of uneven diffusion of transition metal ions in solid-phase reactions, time-consuming and energy-consuming synthesis of active materials, and high synthesis temperature, and achieves reduced energy consumption and heat preservation. The effect of short time and fast self-burning speed

Inactive Publication Date: 2005-01-12
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

In these synthesis processes, there are problems such as high synthesis temperature, long holding time, as long as more than ten hours to several days, large e...

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  • Method of synthetizing lithium ion cell positive electrode material through solution burning
  • Method of synthetizing lithium ion cell positive electrode material through solution burning
  • Method of synthetizing lithium ion cell positive electrode material through solution burning

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Embodiment Construction

[0017] 1. LiNO 3 (Analytical pure 99%) 2.537 grams, Co (NO 3 ) 2 ·6H 2 O (analytically pure 99%) 5.355 grams, Ni (NO 3 ) 2 ·6H 2 O (analytically pure 99%) 3.566 grams, citric acid (C 6 h 8 o 7 ·H 2 O) (analytical purity 99%) 5.724 g, made into 15 ml of aqueous solution, and electromagnetically stirred at 80° C. for 20 minutes.

[0018] 2. Move the solution from the evaporating dish into a muffle furnace that has been kept at 350°C. The solution absorbs heat and evaporates. After 5 minutes, it boils and burns, releasing yellow-brown gas, and the product is black and fluffy. Naturally cool down with the furnace, take out and lightly grind and granulate, then raise the temperature to 850°C at 100°C / hour and keep it for 6 hours to synthesize the sample LiCo 0.6 Ni 0.4 o 2 .

[0019] Synthetic sample LiCo 0.6 Ni 0.4 o 2 The XRD pattern such as figure 1 As shown, the diagram shows that the crystal form is complete, and its diffraction peak is sharp, indicating that ...

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Abstract

In the invention, nitrate is as oxidant; organic carboxylic acid is as fuel. Mixing water solution is prepared by according mol ratio lithium nitrate : nitrate M(NO3)2 : organic carboxylic acid = 1.0-1.2 : 1 : 0.5-2.5. Through burning reaction of solution, the following results are reached: each metallic ion is mixed evenly in atom level; active powder material of anode of lithium ion cell LiMO2(M=Co1-x, Nix, Co1-xMnx) in super fine granularity is obtained; holding temp and holding time can be reduced, and energy is saved.

Description

technical field [0001] The invention relates to a preparation method of energy functional materials, in particular to the preparation of positive electrode materials of lithium ion batteries. Background technique [0002] Among the commercialized lithium-ion battery cathode materials, LiCoO 2 The performance is the best, but due to the lack of cobalt resources and high price, and its actual use capacity is only half of the theoretical capacity, in order to improve performance and reduce costs, a lot of doping modification research has been carried out. The properties of Ni, Mn and Co are similar, the price is lower than Co, LiNiO 2 and LiMn 2 o 4 is following LiCoO 2 More compounds were studied later. However, the preparation of trigonal LiNiO 2 When it is easy to produce cubic LiNiO 2 , while making LiNiO 2 The practical application is very limited. LiMn 2 o 4 The main obstacle to the commercialization of electrode materials is their poor storage performance and ...

Claims

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Application Information

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IPC IPC(8): C01D15/02C01G1/02H01M4/04H01M4/48H01M4/50H01M4/52H01M4/58H01M10/36
CPCY02E60/122H01M4/525H01M4/505H01M10/0525Y02E60/10
Inventor 王新东张立刘伯文李建玲王志高
Owner UNIV OF SCI & TECH BEIJING
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