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
View PDF2 Cites 55 Cited by
  • 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,

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Example Embodiment

[0035] Example 1

[0036] Weigh LiOH·H 2 0 1Kg, and get zirconia balls by mass ratio 1.5: 1 (material weight / ball weight) and add them to the ball mill and dry them for later use after ball milling for 2h, weigh LiOH H in molar ratio 1: 1.96: 0.02: 0.02 2 O (ball milled), electrolytic manganese dioxide (EMD), titanium dioxide (TiO 2 ) and copper oxide (CuO) into the ball mill, add about 1 times the weight of zirconia balls for ball milling for 4h, then calcinate at 500°C for 5h, then continue to calcine at 800°C for 10h, naturally cool to room temperature, take out for grinding, sieve ( 300 mesh or so) to obtain preliminary material A1. Li by mole ratio 2 O-2B 2 O 3 / Preliminary material = 0.5% Weigh out 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 saving and ensuring LiOH·H 2 O ...

Example Embodiment

[0038] Example 2:

[0039] Weigh Li 2 CO 3 1Kg, and take zirconia balls in a mass ratio of 1.5:1 (material weight / ball weight) and add them to the ball mill for 2h and then dry them for later use. 2 CO 3 (Ball-milled), Electrolytic Manganese Dioxide (EMD), Chromium Oxide (Cr 2 O 3 ) and aluminum nitrate (Al(NO) 3 ) 3 ) into the ball mill, and add about 1 times the weight of zirconia balls for 4 hours, then calcined at 450 ° C for 8 hours, and then continued to sinter at 850 ° C for 8 hours, and then cooled to room temperature naturally, taken out, ground and sieved (about 300 mesh) to obtain a preliminary Material A1. According to the molar ratio C / preliminary material=0.6%, weigh an appropriate amount of polyvinyl alcohol PVA and place 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 saving and ensuring the sufficient dispersion to determine. Under the condit...

Example Embodiment

[0041] Example 3

[0042] Weigh anhydrous LiNO 3 1Kg, and take zirconia balls in a mass ratio of 1.5:1 (material weight / ball weight), add them to the ball mill for 2h, and dry them for later use. Weigh LiNO in a 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 the ball mill, and add about 1 times the weight of zirconia balls for 4 hours, then calcined at 600 °C for 4 hours, then continued to calcine at 800 °C for 14 hours, and then cooled to room temperature naturally, taken out for grinding and sieving (about 300 mesh) to obtain a preliminary Material A1. Lithium carbonate: cobalt tetroxide in molar ratio: preliminary material=3: 2: 100 Weigh lithium carbonate and cobalt tetroxide and place them in a beaker, and add about 20 times the mass of acetone to dissolve to obtain lithium carbonate and cobalt tetroxide mixed solution B1, the added acetone The amount is al...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products