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High-capacity high-stability lithium manganate positive electrode material and preparation method thereof

A high stability, positive electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of fast cycle attenuation, poor high temperature performance, and low phase structure purity, so as to improve the specific capacity of charge and discharge, and improve cycle Lifetime and high temperature performance, effect of improving electrochemical performance

Inactive Publication Date: 2014-04-16
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, lithium manganate has shortcomings such as low capacity, fast cycle decay, and poor high-temperature performance, which restrict the development of this material.
The main reasons for these defects are: mn 3+ the dissolution; Jahn-Teller effect; Electrolyte decomposition; The purity of the phase structure is not high or the morphology is irregular

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of doped modified lithium manganate (Li 1.1 mn 1.85 m 0.05 o 4 ): Mix lithium hydroxide, manganese dioxide (D50 is 10 μm), and dopant alumina according to the molar ratio of 1.1:1.85:0.05. The mixing method is dry mixing, and the mixed material is sintered once , the primary sintering temperature adopts multi-stage sintering in different temperature zones, the main sintering temperature is 800 °C, the sintering time in the main temperature zone is 20 h, air is introduced during the sintering process, and the ventilation volume control range is 16 m 3 / h, the sintered material is processed by crushing, crushing, grading, sieving and other processes to obtain the required lithium manganate semi-finished product;

[0026] (2) Coat the lithium manganate semi-finished product obtained in step (1), and the coating material used is LiNi 0.8 mn 0.15 co 0.15 MgO 2 (D50 is 0.15μm), wherein, the total dosage of coating material is 0.5 wt% of lithium manganes...

Embodiment 2

[0029] (1) Preparation of doped modified lithium manganate (Li 1.1 mn (2-X-Y) m Y o 4): Mix lithium hydroxide, trimanganese tetraoxide (D50 is 10 μm), and dopant zirconia according to the molar ratio of 1.05:1.7:0.15. The mixing method is dry mixing, and the uniformly mixed materials are mixed once Sintering, a sintering temperature adopts multi-stage sintering in different temperature zones, the main sintering temperature is 750 °C, the sintering time in the main temperature zone is 22 h, air is introduced during the sintering process, and the ventilation volume control range is 16 m 3 / h, the sintered material is processed by crushing, crushing, grading, sieving and other processes to obtain the required lithium manganate semi-finished product;

[0030] (2) Washing the semi-finished product of lithium manganate obtained in (1), drying and sieving after washing to obtain the semi-finished product of lithium manganate.

[0031] (3) Coat the lithium manganate semi-finished ...

Embodiment 3

[0034] (1) Preparation of doped and modified lithium manganate: mix lithium carbonate, manganese dioxide (D50 is 12 μm), and dopant alumina according to the molar ratio of 1.0:1.8:0.2. The mixing method is wet mixing. The solvent used is ethanol; after mixing evenly, the material is sintered once. The temperature of the first sintering adopts multi-stage sintering in different temperature zones. 3 / h, the sintered material is processed by crushing, crushing, grading, sieving and other processes to obtain the required lithium manganate semi-finished product;

[0035] (2) Coating the lithium manganate semi-finished product processed in step (1), the material of the coating layer is a mixture of lithium carbonate, nickel oxide, and manganese oxide, wherein the molar ratio of Li to metal elements Ni and Mn is 0.60, The total dosage of the coating material is 0.01 wt% of the lithium manganate material, wet coating, the solvent selected is ethanol, and the equipment is wet coating e...

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Abstract

The invention discloses a high-capacity high-stability lithium manganate positive electrode material. The high-capacity high-stability lithium manganate positive electrode material comprises modified lithium manganate Li(1+p)Mn(2-p-q)MpO4 and a clad material N, wherein a molar ratio of Li to Mn to M is 1-1.2 to 1.60-1.99 to 0.01-0.2; the total doping amount of the clad material is 0.01-20 weight percent relative to the lithium manganate. The stability of a crystal structure is improved through doping and cladding, the active substances are coated, complement of advantages between base lithium manganate and clad active material is realized, and the electrochemical performances, particularly cycle life and high-temperature performance, of the material are improved. The specific discharge capacity can be over 110mAh / g, the capacity retention rate is over 94 percent at the high temperature of 45 DEG C due to 100 cycles, the capacity retention rate is over 92 percent at the temperature of 60 DEG C, and the capacity retention rate is over 89 percent at the temperature of 70 DEG C.

Description

[0001] technical field [0002] The invention relates to a lithium ion cathode material and a preparation method thereof, in particular to a high-capacity and high-stability lithium manganate material and a preparation method thereof. Background technique [0003] Lithium manganate has the advantages of good safety performance, good overcharge resistance, high-current charge and discharge performance, environmental friendliness and low price, making lithium manganate one of the most promising positive electrode materials in the production of lithium-ion batteries. . [0004] However, lithium manganate has disadvantages such as low capacity, fast cycle decay, and poor high-temperature performance, which restrict the development of this material. The main reasons for these defects are: mn 3+ the dissolution; Jahn-Teller effect; Electrolyte decomposition; The purity of the phase structure is not high or the morphology is irregular. At present, it is reported that th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62
CPCY02E60/122H01M4/505H01M4/62Y02E60/10
Inventor 李兴翠池田一崇王剑锋陈静波潘刚平范婕
Owner NANTONG RESHINE NEW MATERIAL
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