Lithium ion secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems affecting the gram capacity and cycle performance of active materials, and the inability to form SEI films, etc., to improve safety performance and cycle performance, reducing gas production sources, and broad application prospects

Active Publication Date: 2011-01-26
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the lithium intercalation platform potential of lithium titanate is about 1.55V, which is higher than the formation potential of the SEI film, the SEI film cannot be formed.
Due to the lack of SEI film, the lithium titanate after lithiu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0049] Example 1:

[0050] see Figure 3~4 And 6 to 8, using aluminum foil as the anode electrode substrate, lithium titanate as the anode active material, nickel cobalt manganese lithium as the cathode active material, the anode capacity / cathode capacity of the pole piece is 0.8, and the lithium is completed according to the above method Assembly of ion secondary battery. The prepared battery is activated: the battery is charged with a constant current at a constant temperature of 60°C, so that the lithium titanate is replaced by Li 4 Ti 5 O 12 Become Li 6.5 Ti 5 O 12 , The charging current is 0.5C; after pumping, the battery is charged at a constant current to make Li 5 Ti 5 O 12 Become Li 7 Ti 5 O 12 , The charging current is 1C; finally, the battery is charged at a constant voltage for 12 hours, and then vacuum-sealed, and finally, the resulting battery is reserved.

Example Embodiment

[0053] Example 2: See Figure 5 The difference between this embodiment and embodiment 1 is that: in the first place, the cathode active material is lithium cobalt oxide; in the second place, the anode capacity / cathode capacity of the pole piece is 0.7; in the third place, the prepared battery is Activated at a temperature of 80°C and a constant current charging current of 0.5C, the lithium titanate is replaced by Li 4 Ti 5 O 12 Become Li 5.5 Ti 5 O 12 ; Fourth place, after pumping air, the battery is charged at a constant current, the charging current is 5C, so that Li 5 Ti 5 O 12 Become Li 7 Ti 5 O 12 ; In the fifth place, the battery is finally charged at a constant voltage for 8 hours. Others are the same as Embodiment 1, and will not be repeated in this embodiment.

Example Embodiment

[0056] Example 3:

[0057] see Image 6 The difference between this embodiment and Embodiment 1 is that the anode capacity / cathode capacity of the pole piece is 0.9, and the rest is the same as Embodiment 1, and this embodiment will not be repeated.

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PUM

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a lithium ion secondary battery. The lithium ion secondary battery comprises a cathode, an anode, an isolation membrane and electrolyte, wherein the cathode comprises cathode active substance, adhesive and conductive carbon; the anode comprises a lithium titanate active material, adhesive and conductive carbon; base materials for a cathode plate and an anode plate are aluminum foils; and the ratio of the anode capacity to the cathode capacity is 0.70 to 1.00. The lithium ion secondary battery comprises the following activation steps of: 1, charging the battery with constant current of 0.2C to 5C to change lithium titanate into Li4+xTi5O12 from Li4Ti5O12, wherein the x is more than 0.09 and less than or equal to 2.50; 2, charging the battery changed in the first step with constant current of 0.1C to 5C so that the x in the Li4+xTi5O12 is more than 2.50 and less than or equal to 3.00; and 3, charging the battery changed in the second step with constant voltage for 0.2 to 12 hours, and pumping the gas generated in each step until vacuum. The lithium ion secondary battery has excellent electrochemical performance, and meanwhile, the circulation performance and the high-temperature storage performance of the lithium ion secondary battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion secondary battery using lithium titanate as a negative electrode. Background technique [0002] With the low-carbon economy in the ascendant, lithium-ion secondary batteries are also actively developing in the direction of power vehicles and grid energy storage, and the development of fast-charging and discharging lithium-ion batteries is becoming the focus of research. Spinel lithium titanate Li 4 Ti 5 o 12 , due to its three-dimensional channels that can quickly deintercalate lithium ions and high safety, the lithium ion secondary battery prepared using it has high rate charge and discharge and high safety performance, and has attracted much attention. Studies have shown that the fabrication process of lithium-ion batteries is closely related to the electrochemical performance. The control conditions of battery production will directl...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/131H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 赵丰刚夏恒涛陈小波许瑞
Owner DONGGUAN AMPEREX TECH
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