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Multicomponent doping lithium manganite anode active material used by lithium ion cell

A positive electrode active material, technology doped with lithium manganese oxide, applied in the direction of battery electrodes, electrode manufacturing, electrical components, etc., can solve the problems of poor cycle performance, high temperature capacity decline rate, etc., to achieve improved cycle performance, high temperature capacity The effect of reducing the rate of decay and shortening the process

Active Publication Date: 2009-06-10
YUNNAN NENGTOU HUILONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium manganate LiMn 2 o 4 It has the advantages of high voltage, low cost, small self-discharge, low pollution, and rich resources, but has the disadvantages of poor cycle performance and high rate of high-temperature capacity decline

Method used

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  • Multicomponent doping lithium manganite anode active material used by lithium ion cell
  • Multicomponent doping lithium manganite anode active material used by lithium ion cell
  • Multicomponent doping lithium manganite anode active material used by lithium ion cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation chemical formula is LiMn 1.85 Cr 0.038 Al 0.014 Mg 0.029 Bi 0.002 Ti 0.007 Zr 0.01 Si0.027 B 0.023 o 4 Lithium manganate composite oxide. Lithium carbonate, manganese dioxide, chromium oxide, aluminum oxide, magnesium oxide, bismuth oxide, titanium oxide, zirconium oxide, silicon oxide, boron oxide or their hydroxides are first prepared according to Li:Mn:Cr:Al:Mg:Bi : Ti: Zr: Si: B (atomic molar ratio) = 1: 1.85: 0.038: 0.014: 0.029: 0.002: 0.007: 0.01: 0.027: 0.023 The ratio is ground, mixed uniformly, and dried. Put the above raw materials into a continuous sintering furnace, first heat to 250°C and keep the temperature for 13 hours; then heat to 400°C and keep the temperature for 19 hours; finally heat to 790°C and keep the temperature for 14 hours; Naturally cooled to room temperature in a sintering furnace. Grading inspection is to get the product. The tap density of the product>2.0g / cm 3 , The specific surface area is 0.5—1.5g / cm 2 . ...

Embodiment 2

[0027] The preparation chemical formula is LiMn 1.85 Cr 0.039 Al 0.012 Mg 0.03 Bi 0.001 Ti 0.005 Zr 0.013 Si 0.03 B 0.02 o 4 Lithium manganate composite oxide. Lithium carbonate, manganese dioxide, chromium oxide, aluminum oxide, magnesium oxide, bismuth oxide, titanium oxide, zirconium oxide, silicon oxide, boron oxide or their hydroxides are first prepared according to Li:Mn:Cr:A1:Mg:Bi : Ti: Zr: Si: B (atomic molar ratio) = 1: 1.85: 0.039: 0.012: 0.03: 0.001: 0.005: 0.013: 0.03: 0.02 The ratio is ground, mixed evenly, and dried. The firing process and test strips are the same as in Example 1. Test results such as figure 2 As shown: the first discharge capacity at room temperature is 121.7mAh / g, the lowest discharge capacity is 113mAh / g at the 80th time, the cycle capacity is 114.8mAh / g at 100 cycles, and the 100 cycle capacity only decays by 5.66%.

Embodiment 3

[0029] The preparation chemical formula is LiMn 1.85 Cr 0.042 Al 0.015 Mg 0.035 Bi 0.001 Ti 0.004 Zr 0.003 Si 0.04 B 0.01 o 4 Lithium manganate composite oxide. Lithium carbonate, manganese dioxide, chromium oxide, aluminum oxide, magnesium oxide, bismuth oxide, titanium oxide, zirconium oxide, silicon oxide, boron oxide or their hydroxides are first prepared according to Li:Mn:Cr:Al:Mg:Bi : Ti: Zr: Si: B (atomic molar ratio) = 1: 1.85: 0.042: 0.015: 0.035: 0.001: 0.004: 0.003: 0.04: 0.01 The ratio is ground, mixed uniformly, and dried. The firing process and test strips are the same as in Example 1. Test results such as image 3 Shown: the initial discharge capacity at room temperature reaches 126.1mAh / g, the cycle capacity reaches 109.6mAh / g after 100 cycles, and the capacity only decays by 13% after 100 cycles.

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Abstract

The invention relates to an anode active material of lithium battery. The mechanical formula of active material is LiMn2-xCraAlbMgcBidTieZrfSigBhO4. In composition of manganic acid lithium, it uses multiple doping method to stabilize the sharp crystal structure, to improve the cycle property of manganese acid lithium composite oxide and reduce the speed of high-temperature capacity decrease; the highest first discharge capacity at normal temperature is 126.1mAh / g; the 100-circled capacity at normal temperature at least reduces 5.54%; the first discharge capacity at high temperature as 55Deg. C is 118.5mAh / g; the 100-circled capacity at high temperature as 55Deg. C at least decreases 8%. The invention has simple process and low cost.

Description

Technical field: [0001] The invention relates to a positive electrode active material of a lithium ion battery, more specifically to a lithium manganate composite oxide for a lithium ion battery and a preparation method thereof. Background technique: [0002] Lithium-ion batteries have become the first choice for secondary batteries due to their high specific energy and good cycle performance. The key to the performance of lithium-ion batteries depends on the cathode material. At present, the cathode materials for lithium-ion batteries mainly include lithium cobaltate LiCoO 2 , lithium nickelate LiNiO 2 and lithium manganese oxide LiMn 2 o 4 three kinds. [0003] Lithium Cobalt Oxide LiCoO 2 It has good electrochemical properties and a working voltage of 3.6V. The technology is relatively mature and it is the mainstream product in the current market. However, the reserves of cobalt are limited, the price is expensive, and there are certain safety hazards. Looking for a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01G1/02C01G45/00H01M4/505
CPCY02E60/12Y02E60/10
Inventor 杨成云杨永平徐永平肖杨
Owner YUNNAN NENGTOU HUILONG TECH