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Simple surface modification method of Li-rich cathode material

A lithium-rich cathode material and surface modification technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of high precipitation speed control requirements, low first cycle Coulomb efficiency, and unsatisfactory cycle performance. Achieve the effect of improving interface stability, simplifying process flow, improving rate performance and cycle performance

Active Publication Date: 2015-05-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, there are still several problems for its practical application: the first cycle coulombic efficiency is low;
However, the traditional liquid-phase coating method is complicated, and it is necessary to add corresponding coating ions and corresponding precipitating agents to the active material mother liquid, and the requirements for the control of the precipitation speed are also relatively high, so it is limited to laboratory research.

Method used

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  • Simple surface modification method of Li-rich cathode material
  • Simple surface modification method of Li-rich cathode material
  • Simple surface modification method of Li-rich cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh the composition as 0.7Li 2 MnO 3 ·0.3LiFeO 2 Add 5.000 g of lithium-rich positive electrode material to a mixed solution of deionized water and ethanol (ethanol and deionized water, 100 mL each), and ultrasonically disperse for 0.5 h. 0.0976g RuCl 3 ·XH 2 O (with RuO 2 The solid is dissolved in deionized water and ethanol solution (ethanol and deionized water, 10 mL each). While stirring, add RuCl 3 The solution was added to the suspension of lithium-rich cathode material at a dropping rate of 3mL / min, and stirred in a water bath at 80°C for 4 hours to partially evaporate the solvent. At the same time, the Ru 3+ Take Ru(OH) 3 The form precipitates on the surface of the material. After suction filtration, the suspension was vacuum-dried at 100°C for 12 hours, and then heat-treated in a tube furnace at 450°C for 3 hours, and then cooled with the furnace to obtain RuO. 2 Modified modified lithium-rich cathode material.

Embodiment 2

[0030] Weigh the composition as 0.7Li 2 MnO 3 ·0.3LiFeO 2 Add 5.000 g of lithium-rich positive electrode material to a mixed solution of deionized water and ethanol (ethanol and deionized water, 100 mL each), and ultrasonically disperse for 0.5 h. 0.1953g RuCl 3 ·XH 2 O (with RuO 2 It is dissolved in deionized water and ethanol solution (ethanol and deionized water, 10 mL each) relative to the added amount of the lithium-rich positive electrode material. While stirring, add RuCl 3 The solution was added to the suspension of lithium-rich cathode material at a dropping rate of 3mL / min, and stirred in a water bath at 80°C for 4 hours to partially evaporate the solvent. At the same time, the Ru 3+ Take Ru(OH) 3 The form precipitates on the surface of the material. After suction filtration, the suspension was vacuum-dried at 100°C for 12 hours, and then heat-treated in a tube furnace at 450°C for 3 hours, and then cooled with the furnace to obtain RuO. 2 Modified modified lithium-ric...

Embodiment 3

[0032] Weigh the composition as 0.7Li 2 MnO 3 ·0.3LiFeO 2 Add 5.000 g of lithium-rich positive electrode material to a mixed solution of deionized water and ethanol (ethanol and deionized water, 100 mL each), and ultrasonically disperse for 0.5 h. 0.3905g RuCl 3 ·XH 2 O (with RuO 2 It is dissolved in deionized water and ethanol solution (ethanol and deionized water, 10 mL each) relative to the added amount of the lithium-rich positive electrode material. While stirring, add RuCl 3 The solution was added to the suspension of lithium-rich cathode material at a dropping rate of 3mL / min, and stirred in a water bath at 80°C for 4 hours to partially evaporate the solvent. At the same time, the Ru 3+ Take Ru(OH) 3 The form precipitates on the surface of the material. After suction filtration, the suspension was vacuum-dried at 100°C for 12 hours, and then heat-treated in a tube furnace at 450°C for 3 hours, and then cooled with the furnace to obtain RuO. 2 Modified modified lithium-ric...

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Abstract

The invention discloses a simple surface modification method of a Li-rich cathode material. The Li-rich cathode material is xLi2MnO3.(1-x)LiMO2, wherein M is at least one of Fe, Ni, Co and Mn, and x is larger than 0 and smaller than 1. According to the method, the surface of the Li-rich cathode material can be modified with a metal oxide or a hydroxide without a precipitator. A salt containing coating ions is added to a suspension of the Li-rich material, no other precipitator is added, and the precipitation reaction of the coating ions is realized by the aid of the surface alkalinity of the Li-ion material. The suspension subjected to precipitation reaction is filtered, the obtained solid is dried or directly dried by evaporation, and the dried product is then subjected to heat treatment to obtain the Li-rich cathode material with the surface modified. The prepared Li-rich cathode material has higher specific discharge capacity and initial coulomb efficiency as well as improved rate performance and cycle stability, a precipitant usually required in the coating process is omitted, the cost is saved, and the method is simple in technological process, environment-friendly and prone to industrial production.

Description

Technical field [0001] The invention relates to a method for surface modification and modification of a lithium-rich positive electrode material, and belongs to the technical field of lithium ion batteries. Background technique [0002] The application of lithium-ion batteries in electric vehicles and stationary energy storage has attracted worldwide attention. However, commercial cathode materials for lithium-ion batteries such as LiMn 2 O 4 , LiFePO 4 , LiCoO 2 , The discharge specific capacity and energy density are very limited, which limits its wider application. Lithium-rich cathode material (1-x)Li 2 MnO 3 ·XLiMO 2 Or write Li 1+x (M y Mn 1-y )O 2 , The released specific capacity is significantly higher than the current cathode material, and the material uses a large amount of Mn element, and LiCoO 2 And ternary material Li[Ni 1 / 3 Mn 1 / 3 Co 1 / 3 ]O 2 In comparison, not only is the price low, but also safer and more environmentally friendly. Therefore, lithium-rich cathode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/485H01M4/505H01M10/0525H01M2220/20Y02E60/10
Inventor 赵煜娟胡新飒夏明华王洋赵宗奎
Owner BEIJING UNIV OF TECH
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