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Method for Improving Electrochemical Performance of High Nickel Ternary Cathode Material

A positive electrode material and electrochemical technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of high nickel ternary positive electrode materials such as poor rate and cycle performance, and achieve good rate and cycle performance.

Active Publication Date: 2015-07-29
LONG POWER SYST SUZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of poor rate and cycle performance of high-nickel ternary cathode materials in the prior art, the technical solution provided by the invention is:

Method used

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  • Method for Improving Electrochemical Performance of High Nickel Ternary Cathode Material

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Embodiment 1

[0040] Put 12.78 grams of lithium hydroxide (purity 99.5%) into 1 liter of water for dissolution, then put 1 kilogram of LiNi synthesized in Comparative Example 1 and crushed and classified under stirring conditions. 0.5 co 0.2 mn 0.3 o 2 Material; Dissolve 88.58 grams of cobalt nitrate (purity 99.5%) in 1 liter of water in another container; Slowly add the dissolved cobalt nitrate solution to the continuously stirred LiNi 0.5 co 0.2 mn 0.3 o 2 In the LiOH solution of the material, the whole dropwise addition process takes 30 minutes. After the cobalt nitrate solution was added dropwise, the stirring was continued for 30 minutes, and then the mixed solution was spray-dried to obtain a powder mixture. Finally, the material obtained after sintering the powder mixture in a box furnace at 750°C for 5 hours is coated LiNi 0.5 co 0.2 mn 0.3 o 2 Material. figure 2 and image 3 They are the XRD spectra of the unsintered and sintered materials after coating, respectively. ...

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Abstract

The invention discloses a method for improving electrochemical properties of a nickelic ternary anode material. The method comprises the following steps of: (1) dissolving a soluble cobalt salt in the presence of water, a solution or a solvent; (2) diffusing the nickelic ternary anode material in a soluble cobalt salt solution and stirring; (3) dissolving a soluble lithium salt in the presence of the water, the solution or the solvent; (4) dropping a lithium salt solution into the soluble cobalt salt solution containing the nickelic ternary anode material; (5) carrying out spray drying on mixed liquid; and (6) sintering a dried mixture at a high temperature in the presence of air or oxygen, so as to obtain the anode material, which has better electrochemical rate capability and circulation property when being compared with the former untreated nickelic ternary anode material. The method provided by the invention is easy to operate, so that the scale production is easy to realize.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a method for improving the performance of an active cathode material of a metal oxide lithium ion battery containing nickel, cobalt and manganese, and a corresponding electrode and battery. Background technique [0002] Various positive electrode materials have been investigated in the field of rechargeable batteries. LiCoO 2 Due to its high working voltage and long cycle life, it has become the most commonly used cathode material in commercial lithium-ion batteries. Although LiCoO 2 It is a widely used cathode material in portable rechargeable battery applications, but it has poor Co resources, high toxicity, high price, low actual specific capacity (between 140 and 150mAh / g), and relatively low thermal stability The characteristic of non-toxicity makes it severely limited as a positive electrode material for rechargeable batteries. These limitations have prompted many stu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 黄碧英孙喜梅
Owner LONG POWER SYST SUZHOU
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