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Lithium ion battery and cathode material thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of not being able to improve the high-temperature storage performance of the battery, and not being able to obtain battery performance, so as to improve the structure and cycle stability and improve the high temperature Storage performance and safety performance, the effect of low and high temperature swelling

Active Publication Date: 2012-07-04
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simple mechanical mixing of the two materials does not yield satisfactory battery performance and does not improve the battery's high-temperature storage performance.

Method used

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  • Lithium ion battery and cathode material thereof
  • Lithium ion battery and cathode material thereof
  • Lithium ion battery and cathode material thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The positive active material used in this example is LiCoO 2 and Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Mixed composite cathode, where LiCoO 2 The mass fraction is 60%, and its BET is 0.38m 2 / g, doping coating elements and their content are Mg~0.11%, Al~0.08%, Ti~0.15%, La~0.01%. In the XRD pattern, 2θ 1 , 2θ 2 , Δθ 1 , 2θ 3 , 2θ 4 and Δθ 2 18.69°, 18.93°, 0.24°, 44.40°, 45.22° and 0.82° respectively; Li(Ni 0.5 co 0.2 mn 0.3 )O 2 the I 003 / I 104 1.28, LiCoO 2 the I 003 / I 104 is 1.45. The compacted density of the positive electrode prepared with this active material is 4.0g / cm 3 . The XRD spectrum of above-mentioned composite cathode material is as follows figure 1 As shown, its SEM morphology is as figure 2 shown.

[0047] In the button battery test, the first reversible capacity of the composite positive electrode material at 4.3V cut-off voltage was 161.3mAh / g, and the first reversible capacity at 4.4V cut-off voltage was 175.5mAh / g. Reversible cap...

Embodiment 2

[0050] The positive active material used in this example is LiCoO 2 and Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Mixed composite cathode, where LiCoO 2 The mass fraction is 70%, and its BET is 0.40m 2 / g, doping coating elements and their content are Mg~0.25%, Al~0.05%, Ti~0.08%, Y~0.01%. In the XRD pattern, 2θ 1 , 2θ 2 , Δθ 1 , 2θ 3 , 2θ 4 and Δθ 2 18.65°, 18.90°, 0.25°, 44.40°, 45.20° and 0.80°; Li(Ni 0.5 co 0.2 mn 0.3 )O 2 the I 003 / I 104 1.31, LiCoO 2 the I 003 / I 104 is 1.42. The compacted density of the positive electrode prepared with this active material is 4.0g / cm 3 .

[0051] In the button battery test, the first reversible capacity of the above-mentioned composite positive electrode material at a cut-off voltage of 4.3V was 159.8mAh / g, and the first reversible capacity at a cut-off voltage of 4.4V was 173.0mAh / g.

[0052]In the 454261 pouch battery, the above positive electrode material has a capacity retention rate of 85% after 500 cycles in the voltage...

Embodiment 3

[0054] The positive active material used in this example is LiCoO 2 and Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Mixed composite cathode, where LiCoO 2 The mass fraction is 80%, and its BET is 0.28m 2 / g, doping coating elements and their content are Mg~0.30%, Al~0.08%, Ti~0.06%, Y~0.01%. In the XRD pattern, 2θ 1 , 2θ 2 , Δθ 1 , 2θ 3 , 2θ 4 and Δθ 2 18.71°, 18.94°, 0.23°, 44.42°, 45.23° and 0.81° respectively; Li(Ni 0.5 co 0.2 mn 0.3 )O 2 the I 003 / I 104 1.35, LiCoO 2 the I 003 / I 104 is 1.44. The compacted density of the positive electrode prepared with this active material is 4.0g / cm 3 .

[0055] In the button battery test, the first reversible capacity of the above-mentioned composite positive electrode material was 158.1mAh / g at a cut-off voltage of 4.3V, and the first reversible capacity at a cut-off voltage of 4.4V was 172.4mAh / g.

[0056] In the 454261 pouch battery, the above positive electrode material has a capacity retention rate of 84% after cycling for...

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Abstract

The invention provides a lithium ion battery cathode material, which is applicable to high charge cut-off voltage conditions, and consists of two active substances of LiCoO2 and Li (Ni xCoyMn1-x-y) O2, wherein x is not smaller than 0.3 and is not larger than 0.8, y is not smaller than 0.1 and is not larger than 0.4, and x plus y is not smaller than 0.6 and is not larger than 0.9; both the LiCoO2 and the Li(NixCoyMn1-x-y) O2 are doped with an element M body phase and undergone surface coating of oxide M'Ox, wherein M is at least one of Mg, Ti, Al, Zr, B, La, Ce and Y; M' is at least one of Al, Ti, Mg, Zr, B2, Si and Fe; and the energy density of a lithium ion battery can be obviously improved after using the high voltage cathode material, and the cathode material has the advantages of excellent cycling performance, lower high temperature expansion and the like. In addition, the invention further discloses a lithium ion battery which comprises the cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material suitable for high charge cut-off voltage conditions and a high energy density lithium ion battery prepared therefrom. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high energy density, good cycle performance, high operating voltage, and no memory effect. With the rapid development of electronic technology, people put forward higher energy density and longer cycle performance requirements for lithium-ion batteries. Therefore, the development of high-performance cathode materials is particularly important for the development of lithium-ion batteries. [0003] Among the currently commercialized cathode materials for lithium-ion batteries, the most widely used and mature cathode material is lithium cobalt oxide (LiCoO 2 )...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/48H01M4/62H01M4/131H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 华斌柳娜许瑞徐磊敏庞佩佩
Owner DONGGUAN AMPEREX TECH
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