Method for synthesizing LiCoxMn2-xO4 as anode material of lithium-ion secondary battery

A technology for secondary batteries and positive electrode materials, applied in battery electrodes, electrode manufacturing, electrode heat treatment, etc., can solve problems such as poor cycle performance

Active Publication Date: 2005-07-06
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention will provide a kind of lithium ion secondary battery cathode material LiCo to the art x mn 2-x o 4 Synthetic method, prepare spherical Mn by chemical method first 2 o 3 , and then coat a layer of cobalt compound on its surface, and the coated product is fully mixed with lithium compound and reacted at high temperature to form a lithium cobaltate LiCoO on the surface. 2 thin layer, due to lithium cobalt oxide LiCoO 2 It has high capacity and good cycle performance, thus solving the problem of spinel lithium manganese oxide LiMn 2 o 4 Problems with poor cycle performance

Method used

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  • Method for synthesizing LiCoxMn2-xO4 as anode material of lithium-ion secondary battery
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  • Method for synthesizing LiCoxMn2-xO4 as anode material of lithium-ion secondary battery

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Experimental program
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Effect test

Embodiment 1

[0014] LiOH-H 2 O and manganese dioxide are mixed according to the ratio of Li:Mn=1:2 (atomic ratio), the mixture is put into a crucible, placed in flowing air at 450°C for 9 hours, ground after cooling, and then heated at 800°C Keep warm for 30 hours, grind and sieve the product and make a battery according to the above ratio for charge and discharge test. The voltage range is 4.20-3.15V, and the charge and discharge rate is 0.5C. figure 1 Curves of specific capacity (mAh / g) versus cycle times.

Embodiment 2

[0016] LiOH-H 2 O, electrolytic manganese dioxide (EMD) and Co 3 o 4 Mix according to the ratio of Li:Mn:Co=1:(2-x):x (atomic ratio), put the mixture into a crucible, pretreat it in flowing air at 450°C for 9 hours, grind it after cooling, and then put it in Keep warm at 800°C for 30 hours, grind and sieve the product and make a battery according to the above ratio for charge and discharge test. The voltage range is 4.20-3.15V, and the charge and discharge rate is 0.5C. figure 2 Curves of specific capacity (mAh / g) versus cycle times.

Embodiment 3

[0018] LiOH-H 2 O, manganese trioxide (Mn 2 o 3 ) and Co 3 o 4 Mix according to the ratio of Li:Mn:Co=1:(2-x):x (atomic ratio), put the mixture into a crucible, pretreat it in flowing air at 450°C for 9 hours, grind it after cooling, and then put it in Keep warm at 800°C for 30 hours, grind and sieve the product and make a battery according to the above ratio for charge and discharge test. The voltage range is 4.20-3.15V, and the charge and discharge rate is 0.5C. image 3 Curves of specific capacity (mAh / g) versus cycle times.

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Abstract

This invention refers to positive pole material LiCoxMn2-xO4 of lithium ion secondary cell and synthesis method thereof, especially design for the poor circulation performance of spinel lithium manganate LiMn2O4, which contains dissolving, depositing, drying, calcinating, covering, mixing and high temperature sintering etc. in details it is that preparing spherical MN203, then covering a layer of cobaltic compound, mixing with lithium compound according to Lií† (Co + Mn) ú¢1í†2 (atomic ratio), putting mixture in pot, pretreatment in flowing air at 400-500 degree centigrade for 8-12 hr, grinding after cooling, thermal insulation at 700-850 degree centigrade for 24-48 hr to obtain the positive pole material for lithium ion cell with raised circulation performance.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion secondary batteries, and also includes the synthesis of LiCo x mn 2-x o 4 The chemical treatment of the manganese source precursor used in the invention belongs to the field of chemical industry materials. Background technique [0002] As the cathode material of lithium secondary batteries, lithium cobalt oxide LiCoO is currently the most used 2 , but due to poor cobalt resources and pollution to the environment; and spinel lithium manganate LiMn 2 o 4 Due to the abundant manganese resources, low pollution and high cost performance, it is considered to be the next lithium cobalt oxide LiCoO 2 It will be the preferred cathode material in the future, but its commercialization process is also restricted due to its poor cycle performance. Although the synthesis of spinel lithium manganate LiMn 2 o 4 There are many methods, and there are some products with better perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01G1/02C01G45/00C01G51/00H01M4/02H01M4/04H01M4/48H01M4/50H01M4/58
CPCC01G45/1242C01G51/006C01G51/44C01P2002/32C01P2006/40H01M4/0471H01M4/1391H01M4/505Y02E60/10
Inventor 陈绪文周汉章刘明军
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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