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Method for preparing modified spinelle manganic acid lithium material and lithium secondary battery

A spinel lithium manganate, lithium secondary battery technology, applied in the field of electrochemistry, can solve problems such as capacity decay, and achieve the effects of improving compatibility, easy industrialization, and low production cost

Active Publication Date: 2007-09-19
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, experiments have found that these methods have improved cycle performance during low-rate charge and discharge at room temperature, but the serious capacity fading phenomenon has not been well suppressed during deep charge and discharge, especially at high temperature 55°C.

Method used

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  • Method for preparing modified spinelle manganic acid lithium material and lithium secondary battery
  • Method for preparing modified spinelle manganic acid lithium material and lithium secondary battery
  • Method for preparing modified spinelle manganic acid lithium material and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh LiOH·H 2 O 1Kg, and according to the mass ratio of 1.5:1 (material weight / ball weight), take zirconia balls and add them to the ball mill cylinder for ball milling for 2h, then dry them for later use, and weigh LiOH·H 2 O (ball milled), electrolytic manganese dioxide (EMD), titanium dioxide (TiO 2 ) and copper oxide (CuO) were put into a ball mill cylinder, and zirconia balls of about 1 times the weight were added to the ball mill for 4 hours, then calcined at 500°C for 5h, and then continued to be calcined at 800°C for 10h, cooled naturally to room temperature, taken out and ground, and sieved ( 300 mesh or so) to obtain preliminary material A1. Moore Billy 2 O-2B 2 o 3 / Preliminary material = 0.5% Weigh LiOH·H 2 O and H 3 BO 3 Put it in a beaker, and add about 20 times the mass of methanol to dissolve it to obtain LiOH·H 2 O-H 3 BO 3 / methanol coating solution B1. The amount of methanol added is generally based on the principle of economy and ensures...

Embodiment 2

[0039] Weigh Li 2 CO 3 1Kg, and according to the mass ratio of 1.5:1 (material weight / ball weight), take zirconia balls and add them to the ball mill cylinder for ball milling for 2 hours, then dry them for later use, and weigh Li 2 CO 3 (ball milled), electrolytic manganese dioxide (EMD), chromium oxide (Cr 2 o 3 ) and aluminum nitrate (Al(NO 3 ) 3 ) into a ball mill cylinder, and added about 1 times the weight of zirconia balls for 4 hours, then calcined at 450°C for 8 hours, then continued to sinter at 850°C for 8 hours, cooled naturally to room temperature, took out and ground, sieved (about 300 mesh) to obtain a preliminary Material A1. Weigh an appropriate amount of polyvinyl alcohol PVA by molar ratio C / preliminary material = 0.6%, put it in a beaker and add about 20 times of ethanol to dissolve to obtain PVA coating solution B1. The amount of ethanol added is also based on the principle of economy and ensures the Fully dispersed to determine. Under the conditi...

Embodiment 3

[0042] Weigh anhydrous LiNO 3 1Kg, and according to the mass ratio of 1.5:1 (material weight / ball weight), take zirconia balls and add them to the ball mill cylinder for ball milling for 2 hours, then dry them for later use, and weigh LiNO respectively according to the molar ratio of 1.05:1.94:0.01:0.04 3 (ball milled), electrolytic manganese dioxide (EMD), gallium oxide (Ga 2 o 3 ) and magnesium hydroxide (Mg(OH) 2 ) into a ball mill cylinder, and add about 1 times the weight of zirconia balls for ball milling for 4 hours, then calcined at 600°C for 4 hours, then continued to calcine at 800°C for 14 hours, cooled naturally to room temperature, took out and ground, sieved (about 300 mesh) to obtain a preliminary Material A1. Lithium carbonate by molar ratio: tricobalt tetroxide: preliminary material = 3: 2: 100 Weigh lithium carbonate, tricobalt tetroxide and place in a beaker, and add about 20 times of mass multiple of acetone to dissolve to obtain lithium carbonate, tric...

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Abstract

The invention discloses a modified spinel lithium manganate material used in anode material of lithium secondary battery, the lithium manganate is a kind of doped lithium manganate LiaMn2-bXbO4 with other metallic element X, wherein X is at least one element of chroumium, gallium, magnesium, titanium, cuprum, zincum, 0.97 <= a <= 1.07, 0 <= b <= 0.1; and the surface of the said doped lithium manganate LiaMn2-bXbO4 is provided with a coat which contains at least one kind of boron-lithium composite oxides, cobalt-lithium composite oxides, vanadium-lithium composite oxides or carbon layer. The invention also discloses a preparing method for the said material and the lithium secondary battery using the said material as anode material. The invention provided modified spinel lithium manganate material has relative good high rate deep discharge capacity in normal temperature or high temperature, in mean time, the preparing method is easy for control and operation and industrialisation, and production cost thereof is low.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a modified spinel lithium manganese oxide material used for the positive electrode material of a lithium secondary battery, a preparation method of the material and a lithium secondary battery using the material as the positive electrode material. Background technique [0002] Although LiCoO 2 / C-series lithium-ion batteries have been used in portable electrical appliances such as mobile communications, laptop computers, and video cameras, but the lack of cobalt resources and its high price limit the use of this battery system in fixed peak-shaving power supplies and electric vehicles. aspects of promotion. However, LiMn 2 o 4 The / C system has an absolute advantage in price, and its high safety, high voltage, low pollution and other characteristics have won people's general optimism. But LiMn 2 o 4 There are serious irreversible capacity fading and very fast capacity fading...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/04C01G45/12C01D15/00B22F9/00B22F1/02H01M10/36H01M10/40
CPCY02E60/122Y02E60/10
Inventor 方送生
Owner SHENZHEN BAK POWER BATTERY CO LTD
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