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High-temperature manganic acid lithium cathode material and preparation method thereof

A type of lithium manganate and positive electrode material technology, applied in the field of high-temperature lithium manganate positive electrode material and its preparation, can solve the problems of capacity fading, delaying the pace of large-scale commercialization, poor cycle performance, etc., and achieve simple process Effect

Active Publication Date: 2014-02-05
淮安新能源材料技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium manganese oxide is prone to Jahn-Teller distortion and Mn 2+ Ions dissolve in the electrolyte, resulting in rapid capacity fading
In particular, working in a high temperature environment, the poor cycle performance greatly limits its application
Although the cycle performance has been improved to some extent through research in recent years, the high-temperature cycle performance has not been well resolved, which has delayed its large-scale commercialization.

Method used

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  • High-temperature manganic acid lithium cathode material and preparation method thereof
  • High-temperature manganic acid lithium cathode material and preparation method thereof
  • High-temperature manganic acid lithium cathode material and preparation method thereof

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Embodiment 1

[0017] Product design: spinel lithium manganese oxide doped with anions and cations designed as Li 1.05 Ni 0.1 mn 1.9 o 3.96 f 0.04 , the solid electrolyte uses Li-La-Ti-O (abbreviated as LLTO) system Li 0.3 La 0.56 TiO 3 , by weight, the coated product contains 3.5% solid electrolyte.

[0018] The specific preparation process: the first step, doping anions and cations, preparing Li 1.05 Ni 0.1 mn 1.9 o 3.96 f 0.04 : Weigh the ingredients according to the molar ratio of each element, and the manganese source adopts battery-grade electrolytic Mn 2 O (purity 99.5%), lithium source adopts battery grade Li 2 CO 3 (purity 99.5%), the source material of doping cation adopts analysis pure cobalt acetate Ni (CH 3 COO) 2 4H 2 O (purity 99.5%), LiF (purity 99.5%) is used as the source material for doping anions. Use a high-speed ball mill to mix the raw materials evenly. After drying, calcinate at 820°C for 20 hours in an air atmosphere. After cooling, spinel lithium ma...

Embodiment 2

[0025] Product design: spinel lithium manganese oxide doped with anions and cations designed as Li 1.05 co 0.1 mn 1.9 o 3.96 S 0.04 , the solid electrolyte uses the Li-Al-Ti-P-O (abbreviated as LATP) system Li 1.01 Al 0.2 Ti 1.8 (PO 4 ) 3 , the product after coating treatment contains 3.5wt% solid electrolyte.

[0026] The specific preparation process: the first step, doping anions and cations, preparing Li 1.05 co 0.1 mn 1.9 o 3.96 S 0.04 : Weigh the ingredients according to the molar ratio of each element, and the raw material is battery-grade electrolytic Mn 2 O (purity 99.5%), battery-grade Li 2 CO 3 (purity 99.5%), analytically pure cobalt acetate Co(CH 3 COO) 2 4H 2 O (purity 99.5%), MnS (purity 99.5%). Use a high-speed ball mill to mix the raw materials evenly. After drying, calcinate at 820°C for 20 hours in an air atmosphere. After cooling, spinel lithium manganate doped with anions and cations can be obtained. The second step, crystal form control...

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Abstract

The invention discloses a high-temperature manganic acid lithium cathode material and a preparation method thereof. Single crystal particles of the cathode material consists of a matrix and solid electrolyte which clads the surface of the matrix; the matrix is spinel manganic acid lithium which is doped with anions and cations; and the chemical formula of the material is Li1.05MxMn2-xO4-yQy, wherein M represents the doped cations; and Q represents the doped anions. The preparation method comprises the following steps of: firstly, preparing the spinel manganic acid lithium which is doped with the anions and the cations through solid phase reaction; secondly, synthesizing by using a molten-salt growth method to control a crystal form, and preparing the spinel manganic acid lithium having the particle size of 3 to 5 microns and the characteristic of an octahedron single crystal; and finally, cladding the spinel manganic acid lithium by using the solid electrolyte after the crystal form is controlled. The cathode material has high high-temperature performance and high rate cycle performance, and can be applied to electric automobiles or other kinds of lithium ion power batteries.

Description

technical field [0001] The invention belongs to the field of chemical batteries, and mainly relates to a high-temperature lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] Lithium manganate LiMn 2 o 4 Belonging to the spinel structure, the theoretical capacity is 148mAh / g, and the voltage platform is 3.7V. Lithium manganate cathode material has the advantages of rich raw material resources, low cost, good safety, no environmental pollution, and easy preparation. It has become one of the lithium battery cathode materials with good application prospects, and has broad application prospects in the field of power batteries. However, lithium manganese oxide is prone to Jahn-Teller distortion and Mn 2+ Ions dissolve in the electrolyte, causing rapid capacity fading. In particular, working in a high temperature environment, the poor cycle performance greatly limits its application. Although the cycle performance has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 赵世玺樊学峰南策文邓玉峰
Owner 淮安新能源材料技术研究院
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