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An electrolyte of efficient low-poison and combustion-resisting lithium cell and its lithium cell

A high-efficiency, low-toxicity, electrolyte technology, applied in the field of electrochemical and chemical power supply products, can solve the problems that the battery performance is greatly affected, cannot be used as a solvent alone, and the solubility of lithium salt is low, so as to achieve safe transportation and use, electrochemical Good compatibility, low viscosity effect

Inactive Publication Date: 2007-11-28
常熟紫金知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these phosphate esters have high viscosity, high freezing point, low lithium salt solubility, low phosphorus content, and cannot be used alone as a solvent, even if used as an additive, the amount is limited
When the amount of such additives is too much, it will have a great impact on battery performance and has greater toxicity

Method used

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  • An electrolyte of efficient low-poison and combustion-resisting lithium cell and its lithium cell
  • An electrolyte of efficient low-poison and combustion-resisting lithium cell and its lithium cell
  • An electrolyte of efficient low-poison and combustion-resisting lithium cell and its lithium cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Lithium bisoxalate borate (LiBOB) was added to dimethyl methyl phosphate (DMMP) to form a 0.6M LiBOB+DMMP solution. Inject the electrolyte into Li-MnO 2 In batteries, the prepared Li-MnO 2 The simulated battery discharge performance is shown in Figure 4.

[0036] It can be seen from the figure that at room temperature, MnO 2 The discharge capacity reaches 180mAh / g, and the discharge voltage is higher than 2.8V. Even at -20°C, MnO 2 The battery can also release 70% of the normal temperature capacity, and can release a capacity close to 200mAh / g at 50°C. These data indicate that the use of flame-retardant DMMP solution can not only improve the safety of lithium-manganese batteries, but also improve the discharge performance of the batteries.

Embodiment 2

[0038] Use lithium metal as the negative electrode, spinel lithium manganate as the positive electrode, and 0.8M LiBOB+DMMP solution as the electrolyte to assemble Li-LiMn 2 o 4 secondary battery. The charge and discharge curve of this battery is shown in Figure 5.

[0039] Accompanying drawing 5 has represented the Li-LiMn that adopts 0.8MLiBOB+DMMP electrolyte 2 o 4 The charge and discharge curve of the battery. It can be seen from the figure that the LiMn 2 o 4 The discharge capacity of the positive electrode is 110mAh / g, and the charge-discharge platform is between 4.1V and 3.75V. After 50 cycles, the capacity remains above 100mAh / g. The charge-discharge characteristics are the same as those of the conventional carbonate electrolyte system, indicating that the DMMP electrolyte It has almost no effect on the normal charge and discharge of the battery. Combustion experiments show that this flame-retardant electrolyte does not ignite or burn, and can effectively preven...

Embodiment 3

[0040] Embodiment three: Add lithium hexafluorophosphate (LiPF 6 ) into 0.6M Li LiPF 6 +DMMP+DEMP solution. Inject the electrolyte into Li-MnO 2 In batteries, the prepared Li-MnO 2 The simulated battery can release a capacity of 175mAh / g.

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Abstract

The invention discloses a high-effective low-toxic flameproof lithium battery electrolyte and lithium battery, which is characterized by the following: adopting one ore more phosphate (methyl phosphodimethylester, ethyl phosphodiethylester, ethyl phosphodimethylester) as pure solvent or solvent component; displaying incombustibility based on the electrolyte of phosphate; saving the cost; improving the conductivity and lithium salt solubility and safety with stable electrochemical property.

Description

technical field [0001] The invention relates to a lithium battery using a novel phosphate electrolyte. Specifically, it relates to an electrolyte solution with one or more than one phosphate ester as a solvent and a lithium battery containing the electrolyte solution, belonging to the technical field of electrochemical and chemical power supply products. Background technique [0002] With the rapid development of information technology and the increasing popularity of portable electronic devices, the demand for high specific energy batteries is increasing year by year. Lithium batteries have significant advantages such as high voltage, low self-discharge rate, and high energy density, and are gradually replacing traditional batteries and expanding their application fields and market share. [0003] However, the potential safety hazards of lithium batteries have always been the primary concern of applications. At present, the electrolyte used in lithium batteries is a flamm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M10/056H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 杨汉西冯金奎曹余良艾新平
Owner 常熟紫金知识产权服务有限公司
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