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Large-capacity power lithium battery and preparation method thereof

A power lithium and large-capacity technology, which is applied in the field of large-capacity power lithium battery and its preparation, can solve problems such as power source application, and achieve good high-rate performance, no environmental pollution, and high safety performance

Inactive Publication Date: 2010-06-16
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Neither of the above two lithium batteries can be used as a power source in the fields of hybrid electric vehicles and electric vehicles

Method used

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  • Large-capacity power lithium battery and preparation method thereof
  • Large-capacity power lithium battery and preparation method thereof
  • Large-capacity power lithium battery and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0026] The high-capacity power lithium battery of this embodiment is designed according to the rated capacity of a single battery of 10Ah. It is formed by stacking and packaging a positive electrode, a film of a gel-state polymer electrolyte, and a negative electrode. The film isolation of the polymer electrolyte, the key is that the active material of the negative electrode has a particle size of 0.165μm and a specific surface area of ​​9.2m 2 / g of modified lithium titanate; the active material of the positive electrode is a ternary material; the film of the gel state polymer electrolyte is formed by mixing and drying a solution of a lithium salt and an organic solvent with a conductive polymer solution, Such as figure 1 Shown, its concrete preparation method is as follows:

[0027] A: 84% by weight of modified lithium titanate, 7% by weight of conductive carbon black and 9% by weight of polyvinylidene fluoride as a solute, and N-methylpyrrolidone as a solvent to adjust int...

Embodiment 2

[0034]The large-capacity power lithium battery of this embodiment is designed according to the rated capacity of a single battery of 40Ah. It is formed by stacking and packaging positive electrodes, films of gel-state polymer electrolytes, and negative electrodes. The film isolation of the polymer electrolyte, the key is that the active material of the negative electrode has a particle size of 0.165μm and a specific surface area of ​​9.2m 2 / g of modified lithium titanate; the active material of the positive electrode is a ternary material; the film of the gel state polymer electrolyte is formed by mixing and drying a solution of a lithium salt and an organic solvent with a conductive polymer solution, Such as figure 1 Shown, its concrete preparation method is as follows:

[0035] A: 84% by weight of modified lithium titanate, 7% by weight of conductive carbon black and 9% by weight of polyvinylidene fluoride as a solute, and N-methylpyrrolidone as a solvent to adjust into a ...

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Abstract

The invention provides a large-capacity power lithium battery which can be used in the field of vehicles as a power source and a preparation method thereof. The large-capacity power lithium battery of the invention is prepared by stacking and packaging a positive electrode, the thin film of a gel-state polymer electrolyte and a negative electrode, wherein the active material of the negative electrode is modified lithium titanate, the active material of the positive electrode is one or more of a ternary material, lithium manganate and ferric lithium manganate, and the thin film of the gel-state polymer electrolyte is prepared by mixing and drying a lithium salt, the solution of an organic solvent and a conductive polymer solution. The power lithium battery has the characteristics of environmental friendliness, excellent high magnification performance, excellent heat dispersion and the like. The preparation is simple, environmental pollution and leakage do not exist, the storage service life is long, enlargement is easy and the temperature range for use is wide. The large-capacity power lithium battery can be used as the power source and applied to the fields such as hybrid electric vehicle, electric vehicle and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium battery energy, and in particular relates to a large-capacity power lithium battery and a preparation method thereof. Background technique [0002] With social development and scientific and technological progress, people's demand for energy is increasing. Compared with traditional lead-acid batteries, Ni-Cd, and Ni-MH batteries, lithium-ion batteries are environmentally friendly, high specific energy (140Wh / kg), high voltage platform, long cycle life, small self-discharge, and no memory Effect and other characteristics, it has been widely used in military and civilian fields, including 3C electronic products, various electric tools, etc., and is expected to be used as a power source in hybrid vehicles and electric vehicles. [0003] At present, lithium battery technology is not mature enough, and there are some problems, especially the small capacity of a single cell, which greatly limits the ap...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/131H01M10/058H01M4/485C01G23/00H01M50/417
CPCY02E60/12H01M10/0583H01M4/505H01M4/5825Y02E60/122H01M2300/0094Y02T10/7011H01M2/1653H01M2300/0085H01M10/052H01M4/485Y02E60/10Y02P70/50H01M50/417
Inventor 刘志远李燕翟丽娟秦兆东
Owner CHERY AUTOMOBILE CO LTD
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