Preparation method of ultrahigh-capacity ternary lithium-rich manganese-based composite electrode material

A ternary lithium-rich manganese-based, composite electrode technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., to achieve the effects of improved transmission efficiency, good rate performance, and easy deintercalation

Inactive Publication Date: 2021-04-09
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The test results found that after LaF 3 The specific capacity of the first discharge of the coating decreased by 3.8%, but the first charge and discharge efficiency was significantly improved by 79.2%.

Method used

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  • Preparation method of ultrahigh-capacity ternary lithium-rich manganese-based composite electrode material
  • Preparation method of ultrahigh-capacity ternary lithium-rich manganese-based composite electrode material
  • Preparation method of ultrahigh-capacity ternary lithium-rich manganese-based composite electrode material

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Embodiment 1

[0032] Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 @LaF 3 The composite electrode material is prepared by the following steps:

[0033] (1) According to the stoichiometric ratio Li:Mn:Co:Ni=1.25:0.54:0.13:0.13, weigh 3.199g Li(CH 3 COO)·2H 2 O, 1.825g Mn(CH 3 COO) 2 4H 2 O, 0.730g Ni(CH 3 COO) 2 4H 2 O, 0.683g Co(CH 3 COO) 2 4H 2 O, dissolved in 11ml of deionized water, fully stirred to form a transparent uniform solution; according to the metal ion: citric acid molar ratio of 1:1, weigh 8.616g of citric acid, configure 2mol / L citric acid aqueous solution, and then follow the method of 1.5 drops / s Add the above-mentioned mixed metal salt solution dropwise at a speed of 100°C and continue stirring; then use ammonia water as a pH regulator to adjust the pH of the mixed solution to 8; place the above solution in a water bath at 85°C and heat and stir until a gray wet gel is formed; Dry the gray wet gel in a forced air drying oven at 120°C for 12 hours to obtain Li 1.2 mn ...

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Abstract

The invention discloses a preparation method of an ultrahigh-capacity ternary lithium-rich manganese-based composite electrode material. The method comprises the following steps: by taking Li(CH3COO). 2H2O, Ni(CH3COO) 2.4 H2O, Co(CH3COO) 2.4 H2O and Mn (CH3COO)2.4 H2O as raw materials, citric acid as a chelating agent, water as a solvent and ammonia water as a pH regulator, preparing a Li1.2Mn0.54Co0.13Ni0.13O2 cathode material by a sol-gel method; and performing chemical deposition and calcination through a wet coating method to obtain Li1.2Mn0.54Co0.13Ni0.13O2@LaF3 composite electrode material. the method is simple, wide in raw material source and beneficial to large-scale production; the prepared Li1.2Mn0.54Co0.13Ni0.13O2@LaF3Li composite electrode material has the advantages of ultrahigh capacity, good rate capability, good cycling stability and the like.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation and relates to an ultra-high capacity Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 @LaF 3 Preparation method of composite electrode material. Background technique [0002] The current commercial lithium-ion battery cathode materials mainly include lithium iron phosphate (LiFePO 4 ), lithium cobalt oxide (LiCoO 2 ), ternary materials (NCM, NCA), etc. However, the discharge specific capacity of the above-mentioned positive electrode materials is lower than 200mAh / g, which cannot meet the needs of new energy vehicles for long cruising range. Although NCM811 and lithium-rich manganese-based cathode materials can meet the demand, NCM811 is prone to cation mixing and volume expansion due to its high nickel content, which brings great safety hazards. The reversible specific capacity of the ternary lithium-rich manganese-based cathode material can reach 200mAh / g-300mAh / g, and it has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/62H01M10/0525H01M2004/028H01M2220/20Y02E60/10
Inventor 卑凤利郑子豪温乐刘晋利赵淑宁
Owner NANJING UNIV OF SCI & TECH
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