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Lithium ion battery and method for effectively restraining capacitance loss of Lithium manganite anode material

A technology for lithium-ion batteries and positive electrode materials, applied in secondary batteries, secondary battery manufacturing, non-aqueous electrolyte storage batteries, etc., can solve the problem of reduced capacity, suppress capacity loss, improve storage performance, and improve high-temperature cycle performance Effect

Active Publication Date: 2010-09-15
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that this process only improves the capacity of lithium-ion batteries, and does not solve the problem of large capacity loss during storage. Even if the capacity is large, after a long time of use, the capacity will still be reduced.

Method used

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  • Lithium ion battery and method for effectively restraining capacitance loss of Lithium manganite anode material
  • Lithium ion battery and method for effectively restraining capacitance loss of Lithium manganite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] After the two batches of lithium-ion power batteries were evacuated for the second time, they were discharged at a constant current of 0.3C to 3.0V. After that, it is charged to 4.2V with a constant current of 0.3C and discharged to 3.0V with a constant current of 0.3C. The discharge capacity is defined as D1. Then the two batches of batteries were charged to 3.8V and 4.0V at a constant current and voltage of 0.3C. The batteries were stored at room temperature for 30 days, and after 15 days of storage at high temperature (45°C), they were discharged to 3.0V at a constant current of 0.3C. Then charge to 4.2V with 0.3C constant current and constant voltage, and discharge to 3.0V with 0.3C constant current, and the discharge capacity is defined as D2. The irreversible capacity loss of the battery is defined as 1-D2 / D1.

[0019] After the battery is stored at room temperature, the irreversible capacity loss of the battery with voltage of 3.8V and 4.0V is 8.5% and 1.2% respec...

Embodiment 2

[0022] After the two batches of lithium-ion power batteries were evacuated for the second time, they were discharged at a constant current of 0.3C to 3.0V. After that, it is charged to 4.2V with a constant current of 0.3C and discharged to 3.0V with a constant current of 0.3C. The discharge capacity is defined as D1. After that, the two batches of batteries were charged to 4.2V at a constant current and voltage of 0.3C, and then discharged to 3.8V and 4.1V at a constant current of 0.3C. The battery is stored at room temperature for 30 days and discharged to 3.0V at a constant current of 0.3C. Then charge to 4.2V with 0.3C constant current and constant voltage, and discharge to 3.0V with 0.3C constant current, and the discharge capacity is defined as D2. The irreversible capacity loss of the battery is defined as 1-D2 / D1.

[0023] After the battery is stored at room temperature, when the storage voltage is 3.8V, the irreversible capacity loss is 7.5%; when the storage voltage is...

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Abstract

The invention relates to a manufacturing technique and the mould thereof which belongs to the sewing machine field, particularly relating to a sand bottom technique and the mould thereof. Mainly aiming at the technical problem existing in the prior art that the capacity loss is huge when a battery is stored at normal temperature or the high temperature; the invention provides the lithium ion battery which has the advantages of reasonable design and little capacity loss of the battery at normal temperature or the high temperature storage and a method by which the capacity loss of the manganeseacid lithium anode materials can be effectively controlled. The main technical proposal of the invention is that the battery is stored at the appropriate electrified status and storage voltage, thereby effectively controlling the capacity loss; moreover, the status of charging(SOC) which is 30 to 100 percent is relatively good and the storage voltage which is 3.8 to 4.2V is relatively better.

Description

Technical field [0001] The invention relates to a lithium ion battery, in particular to a method for effectively inhibiting the capacity loss of a lithium manganate cathode material and a lithium ion battery using the method. Background technique [0002] With the world facing increasingly serious environmental problems and the depletion of energy such as oil in the future, seeking renewable energy has become an urgent task for mankind. As a new generation of green high-energy batteries, lithium-ion batteries have many advantages such as high voltage, high specific energy, no memory effect, no pollution, and light weight. They are widely used in electric vehicles, electric bicycles, mobile communications, notebook computers, UPS and other industries , Is considered to be a high-tech product of great significance to the national economy and people’s lives in the 21st century. [0003] Cathode materials are an important part of lithium-ion batteries. At present, the most researched...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/38H01M10/04H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 郑利峰邓龙征唐伟俞琴张兴国何峰张克俭
Owner WANXIANG 123 CO LTD