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Layered nickel-cobalt-lithium manganate positive electrode material used for lithium ion battery and preparation method thereof

A technology for nickel-cobalt lithium manganate and lithium ion batteries, which is applied in the field of layered nickel-cobalt lithium manganate cathode materials and their preparation, can solve the problems of unsuitability for high-capacity batteries, poor safety performance and high temperature performance, and difficulty in meeting the requirements.

Inactive Publication Date: 2014-01-22
CHONGQING TERUI BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it has several problems: (1) the high price due to the lack of cobalt resources; (2) the low gram specific capacity of LiCoO2 material (about 3-4.2V 145mAh / g) makes it more and more difficult to meet the ever-changing development The needs of the electronics industry; (3) Poor safety performance and high temperature performance, not suitable for making high-capacity batteries
It can be seen from the specific examples that the 200-cycle retention rate of this positive electrode material is 91% to 92.5%, and the 500-cycle capacity retention rate is 83% to 86%. On the whole, this positive electrode material has reached a good level. There are certain technical difficulties in further improving the performance of lithium battery cathode materials.

Method used

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  • Layered nickel-cobalt-lithium manganate positive electrode material used for lithium ion battery and preparation method thereof
  • Layered nickel-cobalt-lithium manganate positive electrode material used for lithium ion battery and preparation method thereof
  • Layered nickel-cobalt-lithium manganate positive electrode material used for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Co, Ni, Mn, Ti, Al sulfate, according to the ratio of metal molar ratio 0.19:0.48:0.29:0.02:0.02, is made into 2mol / L solution, and sodium hydroxide containing 13% ammonia is made into 4mol / L L solution is evenly pumped into the reaction kettle with a metering pump, and the pH is controlled to be 10.8, and its product is intermediate A; then 10% (relative to the molar weight of intermediate A) of cobalt and alkali are evenly pumped in with a metering pump , the pH is controlled to 11, and the product is intermediate B; then filtered, washed, and dried; weighed equimolar lithium hydroxide and intermediate B for wet mixing and grinding, then dried at 110°C for 4 hours, and sintered at 600°C For 20 hours, sinter at 950°C for 24 hours, crush to obtain semi-finished product C; make 0.5 mol / L solution of Al chlorate, make 2 mol / L solution of 5% sodium hydroxide containing ammonia, and pump it into In the reaction kettle of ionized water, stir to form a suspension...

Embodiment 2

[0041] Example 2: Co, Ni, Mn, Ti, Mg sulfate, according to the ratio of metal molar ratio 0.19:0.48:0.29:0.02:0.02, is made into 2mol / L solution, and sodium hydroxide containing 13% ammonia is made into 4mol / L L solution is evenly pumped into the reaction kettle with a metering pump, and the pH is controlled to be 10.8, and its product is intermediate A; then 10% (relative to the molar weight of intermediate A) of cobalt and alkali are evenly pumped in with a metering pump , the pH is controlled to 11, and the product is intermediate B; then filtered, washed, and dried; weighed equimolar lithium hydroxide and intermediate B for wet mixing and grinding, then dried at 110°C for 4 hours, and sintered at 600°C For 20 hours, sinter at 950°C for 24 hours, crush to obtain semi-finished product C; make 0.5 mol / L solution of Al chlorate, make 2 mol / L solution of 5% sodium hydroxide containing ammonia, and pump it into In the reaction kettle of ionized water, stir to form a suspension...

Embodiment 3

[0045] Example 3 : Co and Ni, Mn, Ti, Al, Zr sulfate or chlorate, according to the ratio of metal molar ratio 0.19:0.48:0.29:0.01:0.02:0.01, made into 2mo1 / L solution, ammoniacal 13 % sodium hydroxide is made into a 4mo1 / L solution, and is evenly pumped into the reactor with a metering pump, and the pH is controlled to be 10.8, and its product is intermediate A; then, 10% (relative to the intermediate The molar weight of A) cobalt and alkali, pH control is 11, and its product is intermediate B; Then filter, wash, dry; Take equimolar lithium hydroxide and intermediate B and carry out wet mixing grinding, then 110 Dry at ℃ for 4 hours, sinter at 600℃ for 20 hours, sinter at 950℃ for 24 hours, and pulverize to obtain semi-finished product C; make 0.5mol / L solution of Al chlorate, and make 2mol / L solution of 5% sodium hydroxide containing ammonia The solution is pumped into the reaction kettle containing deionized water by a metering pump, stirred to form a suspension, and the p...

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PUM

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Abstract

The invention discloses a layered nickel-cobalt-lithium manganate positive electrode material used for a lithium ion battery. The molecular formula of the positive electrode material is {Li(CoxNiyMnzAlaMgbTicZrd)O2-kLiCoO2}-pMmOn, wherein x, y and z are greater than 0 and less than 1, at least two of the group consisting of a, b, c and d are greater than 0 and less than 0.2, x, y, z, a, b, c and d satisfy the equation that x + y + z + a + b + c + d = 1, k is no less than 0.001 and no more than 0.4, p is no less than 0.0005 and no more than 0.02, and MmOn is one or more selected from a plurality of coated oxides. A preparation method for the positive electrode material comprises the following steps: preparing an intermediate A containing nickel, cobalt, manganese and a few other metal elements by using a coprecipitation method; then coating cobalt on the intermediate A by using a precipitation method so as to form an intermediate B with a shell-core structure; and carrying out secondary sintering at certain temperature for certain time so as to form a semi-finished product C, coating a certain amount of the oxide MmOn on the semi-finished product C and carrying out sintering and crushing so as to obtain a finished positive electrode material product D. The prepared positive electrode material has the advantages of a long cycle life, a low expansion ratio, a high discharge plateau and a 2.5 C rate capacity retention ratio while guaranteeing low cost and high charge and discharge capacity of a lithium battery product.

Description

technical field [0001] The invention relates to a modification process for lithium battery cathode materials, in particular to a layered nickel-cobalt lithium manganese oxide cathode material for lithium ion batteries and a preparation method thereof. Background technique [0002] At present, the commercial lithium-ion battery cathode material is mainly layered LiCoO2. But it has several problems: (1) the high price due to the lack of cobalt resources; (2) the low gram specific capacity of LiCoO2 material (about 3-4.2V 145mAh / g) makes it more and more difficult to meet the ever-changing development The needs of the electronics industry; (3) Poor safety performance and high temperature performance, not suitable for making high-capacity batteries. [0003] Therefore, the development of some positive electrode materials with excellent cost performance and adaptability to different fields is an urgent task and hot spot in this industry at present. At present, the research at h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘悉承许文湘程冲
Owner CHONGQING TERUI BATTERY MATERIAL