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Lithium titanate battery

A lithium titanate battery and lithium difluorophosphate technology, which is applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problem of reducing the theoretical cycle life of lithium-ion batteries, deformation of lithium-ion battery shells, and affecting lithium-ion batteries. Improve battery performance and other issues, achieve the effect of improving high-temperature cycle performance and storage performance, improving flatulence problems, and improving stability

Pending Publication Date: 2017-09-22
OPTIMUM BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lithium-ion battery using lithium titanate as the negative electrode material is prone to flatulence during charging, discharging and storage, which leads to deformation of the lithium-ion battery shell and outgassing, which greatly reduces the theoretical cycle life of the lithium-ion battery and affects The performance of lithium-ion batteries

Method used

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Examples

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Embodiment 1

[0029] Referring to the preparation method of the conventional electrolyte of Comparative Example 1, the difference is that on the basis of Comparative Example 1, polysiloxane with a mass fraction of 2% is further added.

Embodiment 2

[0031] Referring to the preparation method of the conventional electrolyte of Comparative Example 1, the difference is that on the basis of Comparative Example 1, polysiloxane with a mass fraction of 4% is further added.

Embodiment 3

[0033] Referring to the preparation method of the conventional electrolyte of Comparative Example 1, the difference is that on the basis of Comparative Example 1, polysiloxane with a mass fraction of 6% is further added.

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Abstract

A lithium titanate battery comprises a positive pole plate, a negative pole plate, a separator and an electrolyte, wherein the positive pole plate comprises a positive current collector and a positive active substance, the positive active substance is coated on the positive current collector, the negative pole plate comprises a negative current collector and a negative active substance, the negative active substance is coated on the negative current collector, the electrolyte comprises an organic solvent, a lithium salt and a functional additive, the functional additive is polysiloxane and lithium difluorophosphate, and the electrolyte is injected after winding the positive pole plate, the separator and the negative pole plate. In the lithium titanate battery provided by the invention, the polysiloxane and the lithium difluorophosphate are added into the electrolyte, the decomposition of LiPF6 is prevented, the content of HF is reduced, the stability of an interface of the electrolyte and lithium titanate is improved, the problem of gas expansion of the lithium titanate is effectively solved, and the high-temperature cycle property, the storage performance and the low-temperature output performance of a lithium titanate power battery are improved.

Description

【Technical field】 [0001] The invention relates to the technical field of battery materials, in particular to a lithium titanate battery. 【Background technique】 [0002] Spinel lithium titanate (Li 4 Ti 5 o 12 ) as the negative electrode material of lithium-ion batteries, has the advantages of zero strain in the lithium-ion deintercalation process, a high-voltage platform of 1.5V relative to lithium, theoretically no SEI film is formed, and it is not easy to cause metal lithium precipitation. , start-stop battery and energy storage battery and other fields have certain advantages. However, the lithium-ion battery using lithium titanate as the negative electrode material is prone to flatulence during charging, discharging and storage, which leads to deformation of the lithium-ion battery shell and outgassing, which greatly reduces the theoretical cycle life of the lithium-ion battery and affects properties of lithium-ion batteries. [0003] In view of this, it is necessar...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 王振峰钟莎莎王海涛许辉饶睦敏
Owner OPTIMUM BATTERY CO LTD
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