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A kind of formation method of lithium titanate battery

A technology of lithium titanate battery and chemical formation method, which is applied in the direction of battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of negative influence on the stability of the interface of the positive electrode structure, complicated process, and long time required, etc., and achieve shortening Efficient time, uniform film formation, and improved chemical conversion efficiency

Active Publication Date: 2021-12-17
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned formation schemes have achieved good formation effects, there are still some problems: (1) the current schemes are mostly high-potential formation (2.7-3.0V), under this condition, the positive electrode structure and interface stability may be adversely affected; (2) Most of the existing formation schemes are formed in the full SOC (State of Charge) stage, the process is still relatively complicated, and the time required is too long

Method used

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  • A kind of formation method of lithium titanate battery
  • A kind of formation method of lithium titanate battery
  • A kind of formation method of lithium titanate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The NCM / LTO lithium titanate battery soaked by liquid injection was placed on the pressure formation equipment at 25°C, the pressure was applied to the battery at 0.05MPa, and the battery was charged at a constant current of 0.5C for 1h to 50% SOC (4Ah). Then keep the pressure constant, raise the temperature of the device to 80°C, and let it stand for 30 minutes. Finally, charge and discharge the battery with a current of 0.1C, the cycle SOC range is 45%-55% (±5%), and the number of cycles is 5 (the relationship between current and time, see figure 1 ). After the program is over, remove the battery, carry out vacuum degassing and sealing, the vacuum degree is -0.095MPa, and the vacuuming time is 25s. The total synthesis time is 6.5h.

Embodiment 2

[0026] The NCM / LTO lithium titanate battery soaked by liquid injection was placed on the pressure formation equipment at 25°C, the pressure was applied to the battery at 0.1MPa, and the battery was charged at a constant current of 0.5C for 1.2h to 60% SOC (4.8Ah). Then keep the pressure constant, raise the temperature of the device to 90°C, and let it stand for 30 minutes. Finally, charge and discharge the battery with a current of 0.05C, the cycle SOC range is 58%-62% (±2%), and the cycle number is 8 cycles. After the program is over, remove the battery, carry out vacuum degassing and sealing, the vacuum degree is -0.095MPa, and the vacuuming time is 25s. The total integration time is 8.1h.

Embodiment 3

[0028]The NCM / LTO lithium titanate battery soaked by liquid injection was placed on a pressure formation device at 25°C, the pressure was applied to the battery at 0.1MPa, and the battery was charged at a constant current of 1C for 48min to 80% SOC (6.4Ah). Then keep the pressure constant, raise the temperature of the device to 80°C, and let it stand for 30 minutes. Finally, charge and discharge the battery with a current of 0.1C, the cycle SOC range is 78%-82% (±2%), and the number of cycles is 8. After the program is over, remove the battery, carry out vacuum degassing and sealing, the vacuum degree is -0.095MPa, and the vacuuming time is 25s. The total synthesis time is 4.5h.

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Abstract

The invention relates to a high-efficiency lithium titanate battery formation method, which mainly aims to improve the gas production problem of the lithium titanate battery during high-temperature application. The formation method mainly includes: in the state adjustment stage, the lithium titanate battery is placed on the pressure formation equipment, and a certain pressure is applied, and charged to a certain SOC with a certain current and constant current under normal temperature conditions; in the precise film formation repair stage, the pressure is maintained And increase the temperature, and at this temperature, the battery is subjected to a small current square wave perturbation charge and discharge cycle. The formation method can quickly form a uniform and dense passivation film on the surface of the lithium titanate negative electrode, which greatly improves the quality and efficiency of the film formation during the formation process, effectively improves the high-temperature gas production problem of the lithium titanate battery, and then improves the efficiency of the lithium titanate battery. Performance of lithium titanate battery. Compared with the existing formation scheme, the method is simpler to operate and takes less time, can significantly reduce the production and time costs of lithium titanate batteries, and is beneficial to promote the industrialization of lithium titanate batteries.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a method for forming a lithium titanate battery. Background technique [0002] Lithium titanate, as an "emerging" negative electrode material, has many unique advantages compared with traditional carbon negative electrode materials: first, lithium titanate material is a "zero strain" material, and the material has excellent structural stability within the normal pressure limit range; Secondly, the voltage platform of lithium titanate material to metal lithium is about 1.55V, and lithium dendrites will not be precipitated during charging, which greatly reduces the safety hazard in the application of lithium titanate batteries; finally, the lithium titanate material is spinel Structure, with three-dimensional lithium ion transport channel, lithium ion diffusion speed is fast, so it also has excellent rate performance and wide temperature range. [0003] However, a major disadvanta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/058H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M10/446H01M10/058H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10Y02P70/50
Inventor 孙小嫚钱丽高雅陈锴吴可
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD