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Columnar structure LiCoO2 electrode material and its preparing process

A technology of structural lithium cobalt oxide and electrode materials, applied in electrode manufacturing, structural parts, battery electrodes, etc., can solve the problem of the reduction of reversible capacity of electrode materials, structural stability, that is, electrochemical cycle performance and anti-overcharge performance have no significant effect, etc. problem, to achieve the best electrochemical cycle performance, high specific capacitance, good anti-overcharge performance.

Inactive Publication Date: 2005-11-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal oxides such as MgO are non-electrochemically active substances, and their addition will cause a decrease in the reversible capacity of the electrode material. In addition, this method does not change the bulk structure of the material, so the structural stability of the electrode material, that is, the electrochemical cycle performance And the improvement of anti-overcharge performance has no significant effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Lithium hydroxide, basic cobalt carbonate and citric acid are used as raw materials, and the raw materials are weighed and mixed according to the ratio of Li / Co / citric acid=1.05 / 1 / 2.05 (molar ratio), dissolved in deionized water, and formulated as Li + The concentration is 4mol·L -1 The solution was reacted in a rotary evaporator (50°C, 100rpm) for 2 hours to form a dark red sol, which was then transferred to a vacuum drying oven and dried in vacuum at 100°C for 4 hours to obtain a fluffy red xerogel. The glue was pretreated at 500 °C for 2 hours to obtain dark brown flocs, which were ground and put back into the muffle furnace, and then baked at 800 °C for 9 hours to obtain LiCoO in accordance with the stoichiometric ratio. 2 product, as a precursor for molten salt ion exchange reactions.

[0017] Zinc nitrate hexahydrate Zn(NO 3 ) 2 ·6H 2 O and layered LiCoO 2 The precursors were mixed according to the ratio of Zn / Li=5 (molar ratio), heated in a water bath at 50°...

Embodiment 2

[0019] Lithium hydroxide, basic cobalt carbonate and citric acid are used as raw materials, and the raw materials are weighed and mixed according to the ratio of Li / Co / citric acid=1.1 / 1 / 2.1 (molar ratio), dissolved in deionized water, and formulated as Li + The concentration is 2mol L -1 The solution was reacted in a rotary evaporator (80°C, 60rpm) for 3 hours to form a dark red sol, which was then transferred to a vacuum drying oven and dried in vacuum at 140°C for 3 hours to obtain a fluffy red xerogel. The glue was pretreated at 400°C for 5 hours to obtain dark brown flocs, which were ground and put back into the muffle furnace, and then baked at 850°C for 6 hours to obtain LiCoO in accordance with the stoichiometric ratio. 2 product, as a precursor for molten salt ion exchange reactions.

[0020] Zinc nitrate hexahydrate Zn(NO 3 ) 2 ·6H 2 O and layered LiCoO 2The precursors were mixed according to the ratio of Zn / Li=15 (molar ratio), heated in a 70°C water bath and co...

Embodiment 3

[0022] Lithium hydroxide, basic cobalt carbonate and citric acid are used as raw materials, and the raw materials are weighed and mixed according to the ratio of Li / Co / citric acid=1.15 / 1 / 2.15 (molar ratio), dissolved in deionized water, and formulated as Li + The concentration is 3mol L -1 The solution was reacted in a rotary evaporator (70°C, 60rpm) for 3 hours to form a dark red sol, which was then transferred to a vacuum drying oven and dried in vacuum at 120°C for 4 hours to obtain a fluffy red xerogel. The glue was pretreated at 450 °C for 4 hours to obtain dark brown flocs, which were ground and put back into the muffle furnace, and then baked at 900 °C for 3 hours to obtain LiCoO in accordance with the stoichiometric ratio. 2 product, as a precursor for molten salt ion exchange reactions.

[0023] Cadmium nitrate tetrahydrate Cd(NO 3 ) 2 4H 2 O and layered LiCoO 2 The precursors were mixed according to the ratio of Zn / Li=5 (molar ratio), heated in a water bath at 7...

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Abstract

This invention provides one layer column structure cobalt acid lithium electrode materials and tits process method, wherein, the chemical components of the materials are Li(1-2beta)MbetaCoO2 with typical structure ofalpha-NaFeO2. The invention adopts lemon acid sol to gel method and substitutes the lithium ions with metal ion of Zn<2+> or Cd<2+> and then gets the layer column structure cobalt acid lithium through the evenly distribution of the metal ion on the main layer board clamping layer of CoO2.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials and their preparation, and in particular provides a columnar structure lithium cobaltate electrode material and a preparation method thereof, which is a columnar structure lithium cobaltate electrode material doped with transition metal ions instead of lithium ions The preparation method thereof is molten salt ion exchange reaction. Background technique [0002] With α-NaFeO 2 type layered LiCoO 2 It has the most excellent electrochemical performance among various lithium-ion battery cathode materials, and is the main cathode material for commercial lithium-ion batteries. But LiCoO 2 Expensive, the actual specific capacity is 120~140mAh·g -1 , only its theoretical capacity (274mAh·g -1 ) about 50%; LiCoO 2 The anti-overcharge performance is poor, and the specific capacity decreases rapidly at a higher charging voltage. To overcome LiCoO 2 Existing problems, people hav...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 杨文胜李秀梅段雪
Owner BEIJING UNIV OF CHEM TECH
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