Prepn process of polynary positive pole material of lithium ion cell with compound transition metal oxide as intermediate product

A composite oxide, lithium-ion battery technology, used in oxide/hydroxide preparation, battery electrodes, electrical components, etc., to achieve excellent electrochemical performance, large size, and improve energy density.

Active Publication Date: 2006-10-18
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing synthesis methods, and to provide a multi-element positive electrode material for lithium-ion batteries with excellent performance prepared from transition metal composite oxides as intermediate products

Method used

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  • Prepn process of polynary positive pole material of lithium ion cell with compound transition metal oxide as intermediate product
  • Prepn process of polynary positive pole material of lithium ion cell with compound transition metal oxide as intermediate product
  • Prepn process of polynary positive pole material of lithium ion cell with compound transition metal oxide as intermediate product

Examples

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Embodiment 1

[0029] to synthesize LiNi 0.5 co 0.2 mn 0.3 o 2 As an example, measure and weigh the oxides of nickel, cobalt, and manganese (the molar ratio of Ni:Co:Mn=5:2:3), add water and wet mix for 1 hour, dry and dry mix for 3 hours after mixing, fully stir to make Mix evenly, transfer to a sintering furnace for the first step of calcination, the calcination temperature is 800°C, and the holding time is 6 hours, and the transition metal composite oxide intermediate product is obtained. figure 1 It can be seen from the XRD pattern that the intermediate product is a single-phase composite oxide with a spinel structure.

[0030] Add lithium hydroxide and lithium nitrate (the molar ratio of lithium hydroxide and lithium nitrate is 1:1) to the composite oxide intermediate product according to the metering, first wet mix and then dry mix (the method is the same as above), and carry out the second step of calcination after fully mixing , The calcination temperature in the air is 600°C, an...

Embodiment 2

[0037] Measure and weigh nickelous hydroxide, cobalt nitrate and manganese carbonate (the molar ratio of Ni: Co: Mn = 3: 3: 3), after mixing (the mixing method is the same as in Example 1) and calcining, the calcining temperature is 900 ° C, and the heat preservation After 4 hours, a transition metal composite oxide was obtained. Add lithium carbonate and lithium acetate (the molar ratio of lithium carbonate and lithium acetate is 2:1) to the composite oxide intermediate product according to the metering, after mixing (the mixing method is the same as that in Example 1), heat at 700° C. for 5 hours. After cooling and crushing, it is calcined at 950°C for 10 hours. After cooling, the final product LiNi can be obtained by ball milling 1 / 3 co 1 / 3 mn 1 / 3 o 2 . The discharge specific capacity of the material is 151mAh / g under the conditions of 0.5C and 2.8-4.3V / Li, and the capacity retention rate is 92% after 50 cycles.

Embodiment 3

[0039] Measure and weigh nickel nitrate, cobalt acetate and manganese dioxide (Ni: Co: Mn molar ratio = 7: 2: 1), wet mix with ethanol first, dry mix after drying, and then calcine at a temperature of 500°C , and the holding time was 15 hours to obtain a transition metal composite oxide. Add lithium carbonate, lithium hydroxide and lithium nitrate (the molar ratio of lithium carbonate, lithium hydroxide and lithium nitrate is 1:1:1) to the composite oxide intermediate product by metering, after mixing (the mixing method is the same as in Example 1), After 500 ℃, heat preservation for 15 hours. After cooling and crushing, it is calcined at 800°C for 30 hours. After cooling, the final product LiNi can be obtained by ball milling 0.7 co 0.2 mn 0.1 o 2 . The discharge specific capacity of the material under the condition of 0.5C and 2.8-4.3V / Li is 154mAh / g, and the capacity retention rate is 83% after 50 cycles.

[0040] LiNi multi-element cathode material for lithium-ion b...

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Abstract

The present invention relates to the preparation process of polynary positive pole material of lithium ion cell. The polynary positive pole material is prepared through first preparation of compound transition metal oxide in spinel structure as the intermediate product, the subsequent mixing with lithium salt and final high temperature calcining. The polynary positive pole material has composition of LiNixCoyMn(1-x-y)O2, where, x is 0.1-0.8, y is 0.1-0.5, and x+y is 0.5-1.0. The polynary positive pole material has homogeneous granularity distribution, specific discharge capacity in 2.8-4.3 V/Li up to 157 mAh/g, excellent circulating stability and low cost, and is suitable for use in lithium ion cell.

Description

technical field [0001] The present invention relates to a preparation method of a multi-element positive electrode material for a lithium ion battery, more precisely, it relates to the preparation of a multi-element positive electrode material for a lithium ion battery with excellent performance by using a transition metal composite oxide as an intermediate product by a solid phase calcination method method. The invention belongs to the field of lithium ion battery electrode materials. technical background [0002] With the continued popularity of mobile electronic consumer products such as mobile phones, digital cameras, notebook computers, PDAs and camcorders, and the huge application potential of lithium-ion power batteries, the market demand for lithium-ion batteries will still maintain a considerable growth rate in the future. The global annual demand for lithium cobalt oxide, a traditional cathode material, has exceeded 10,000 tons, which has led to a sharp rise in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/02C01B13/14H01M4/505H01M4/525
CPCY02E60/10
Inventor 夏保佳张建韩学武
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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