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Lithium ion secondary accumulator battery and manufacturing process thereof

A secondary battery and lithium-ion technology, applied in the direction of secondary battery, electrode manufacturing, sustainable manufacturing/processing, etc., can solve problems such as difficult synthesis, low cycle life, and low attractiveness

Inactive Publication Date: 2010-10-06
潘树明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the stable structure of the latter types of spinel, it is difficult to synthesize, and there are relatively few studies, and the energy density is not high and the attraction is not great.
However, it can be doped with anions, cations and change the type and quantity of doped ions to change the battery capacity and cycle performance. Therefore, it is cheaper than LiCoO2 and is highly valued, but the cycle life of the battery is longer than that of LiCoO. 2 Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. With Li(Ni (0.31-M) co (0.35-M) mn (0.34-M) D. M )O 2 Materials were synthesized with Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 )2·6H 2 O, Mn(NO 3 ) 2 and CuO, TiO, SiO to form Li(Ni 0.30 co 0.34 mn 0.33 Cu 0.01 Ti 0.01 Si 0.01 )O 2 . Mix evenly and add to water, stir continuously at 75°C, add saturated citric acid solution, then age and sinter at 80°C for 4.5h. The gel is dehydrated at 145°C, and the dehydrated material is sintered at 460°C for 7.5 hours, then heated to 870°C for 22 hours, and then lowered to 25°C in the furnace. The spare material number is B 1 .

[0031] 2. Li(Co 0.33-x Ni 0.39-y mn 0.28-x Si 2x Cu y )O 2 Synthesis of Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 and LiCo 3 、Nd 2 o 3 dubbed Li(Co 0.32 Ni 0.37 mn 0.27 Si 0.02 Cu 0.02 )O 2 , added to the solution of citric acid and ethanol, partial neutralization reaction occurs, oligomers are formed, polycondensation reaction is carried out, synthesized at 730 °...

Embodiment 2

[0049] Li[Ni (0.31-M) co (0.35-M) mn (0.34-M) D. M ]O 2 Materials were synthesized with Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 )2·6H 2 O, Mn(NO 3 ) 2 and CuO, TiO, SiO to form Li(Ni 0.29 co 0.33 mn 0.32 Ti 0.02 Si 0.02 Cu 0.02 )O 2 . Mix evenly and add to water, stir continuously at 75°C, add saturated citric acid solution, then age and sinter at 80°C for 5.5 hours. The gel is dehydrated at 146°C, and the dehydrated material is sintered at 460°C for 8.6 hours, then heated to 880°C for 25 hours, and then cooled to room temperature in the furnace. The spare material number is B 8 , that is, with B 8 Standby material replaces embodiment B 1 spare material.

[0050] Other process conditions are identical with embodiment 1.

Embodiment 3

[0052] B 1 The preparation process condition of material is identical with embodiment 1, just the numbering of embodiment 1 is B 2 change, B 2 The material preparation process conditions were changed to Li(Co 0.31 Ni 0.36 mn 0.26 Si 0.04 Cu 0.03 )O 2 Add to the solution of citric acid and ethanol, partial neutralization reaction occurs, oligomers are formed, polycondensation reaction is carried out, synthesized at 730 ° C, kept for 24 hours, cooled to room temperature, spare material number is B 9 , that is, with B 9 Standby material replaces embodiment B 2 Standby material, other processing conditions are identical with embodiment 1.

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Abstract

The invention relates to a lithium electron power battery and a preparation process thereof. The lithium electron power battery comprises anode and cathode materials, positive and negative plates, an electrolyte and a diaphragm, wherein the positive and negative plates consist of positive and negative current collectors and active materials coated on the positive and negative current collectors. The anode material is prepared by mixing LiMPO4 and Li(Fe1-yMy)PO4 and preserving the heat for 15 to 30 hours at the temperature of between 500 and 900 DEG C, wherein M in the LiMPO4 is Co, Ni or Fe; M in the Li(Fe1-yMy)PO4 is one or two of Si, Nd, Al, La, Pr, Mg and the like; x is more than or equal to 0.001; and y is less than or equal to 0.02. The cathode material is mainly made of graphite with the carbon content of 99.99 percent and adopts a diaphragm material with good chemical stability. The positive and negative plates are put into the center of the folio diaphragm and lithium hexafluorophosphate / vinyl carbonic ether is poured into the diaphragm. A forming current is controlled in the range of 0.5 to 5C. The prepared battery has the characteristics of high electrical property, energy saving and environment protection.

Description

technical field [0001] The present invention relates to an energy and new material technology, in particular to a lithium-ion secondary battery and its manufacturing technology technical background [0002] LiCoO is a commonly used cathode material for lithium-ion batteries 2 It is a layered structure of cobalt lithium oxide, and the structure is relatively stable. In an ideal layered structure, Li 1+ and Co 3+ each in alternating octahedral positions in a cubic close-packed oxygen layer, in LiCoO 2 In general, there is a small amount of disordered structure, such as the rotation of O-Co-O sheets. In the charged state, aging can also change the surface of the particles and the corresponding electronic chemical properties. Spinel will also be formed when overcharged. Phase, such as charging to 4.7V, will lead to an increase in irreversible capacity and polarization, a slowdown of the kinetic process, and an increase in the number of dislocations and the number of internal ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58C01B25/45H01M10/38
CPCY02E60/10Y02P70/50
Inventor 潘树明
Owner 潘树明
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