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Novel bonder for lithium ion batteries

A lithium-ion battery and binder technology, which is applied in the direction of non-polymer binder additives, adhesives, battery electrodes, etc., can solve the problems of relatively large shrinkage difference, increased charge and discharge load, and poor load characteristics. Achieve the effect of improving charge and discharge capacity, good film forming, and strong adsorption capacity

Inactive Publication Date: 2010-12-22
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyvinylidene fluoride is a crystalline polymer, the crystallinity is generally about 50%, and the crystallization melting temperature is around 140°C. Therefore, at the normal operating temperature of the battery, the crystallinity of polyvinylidene fluoride makes the molecules in the electrolyte liquid very It is difficult to circulate, and the charge and discharge load increases; when the drying speed when preparing the battery is not suitable, the shrinkage rate of polyvinylidene fluoride and the shrinkage rate of the current collector are relatively different, and the coating film containing the active material will not be removed from the current collector. Physical detachment; even if there is no problem after coating and drying, as time goes by, during use, the electrode mixture layer may be partially or completely peeled off from the collector due to the internal stress of the electrode, and the load characteristics will deteriorate, causing capacity degradation

Method used

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  • Novel bonder for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation process of the binder for the novel lithium-ion battery of the present embodiment is as follows:

[0021] 1. Preparation of Manganese Mucic Acid Complex Powder

[0022] (1) Manganese acetate and mucus acid were dissolved in an aqueous solution at a molar ratio of 1:1, fully stirred, and reacted at 80° C. for 4 hours to obtain a manganese mucus acid complex solution.

[0023] (2) Add an appropriate amount of ethanol, lower the temperature and cool down, let stand for precipitation, filter, wash, and dry to obtain white mucus acid manganese complex powder.

[0024] 2. Preparation of binder for lithium-ion batteries

[0025] 8% manganese mucus acid complex, 90% vinylidene fluoride, and 2% tetrafluoroethylene copolymer are used as binders.

[0026] The use of the binder can increase the charging and discharging capacity of the carbon-coated lithium iron phosphate lithium battery cathode material by about 3%.

Embodiment 2

[0028] 1. Preparation of Manganese Mucic Acid Complex Powder

[0029] (1) Manganese chloride and mucus acid are dissolved in an aqueous solution at a molar ratio of 1:1, fully stirred, and reacted at 60° C. for 6 hours to obtain a manganese mucus acid complex solution.

[0030] (2) Add appropriate amount of ethanol and N, N-dimethylformamide in sequence, cool down, let stand for precipitation, filter, wash and dry to obtain white mucoic acid manganese complex powder.

[0031] 2. Preparation of binder for lithium-ion batteries

[0032] 2% of manganese complex of mucus acid, 75% of vinylidene fluoride, 20% of tetrafluoroethylene, 3% of propylene are used as binder. The binder has good flexibility and chemical stability. The binder has good charge-discharge cycle characteristics.

Embodiment 3

[0034] 1. Preparation of Manganese Mucic Acid Complex Powder

[0035] (1) Manganese nitrate and mucus acid were dissolved in an aqueous solution at a molar ratio of 1:1, fully stirred, and reacted at 50° C. for 7 hours to obtain a manganese mucus acid complex solution.

[0036] (2) Add an appropriate amount of ethanol, lower the temperature and cool down, let stand for precipitation, filter, wash, and dry to obtain white mucus acid manganese complex powder.

[0037] 2. Preparation of binder for lithium-ion batteries

[0038] 70% vinylidene fluoride, 26% chlorotrifluoroethylene copolymer and 4% mucus acid manganese complex powder are blended to form a binder, which can improve the binding of the electrode active mixture and the collector It can prevent the electrode material from falling off and improve the cycle characteristics of the battery to a certain extent.

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Abstract

The invention relates to a novel battery bonder, in particular to the bonder applied to a lithium ion battery system. The bonder is characterized in that: the bonder is prepared by uniformly mixing and copolymerizing polymers, such as sized or nano manganese mucic acid complex powder of which micro-topography is shown as pictures 1 and 2, vinylidene fluoride and the like, wherein mass percentage manganese mucic acid concentration of the bonder ranges from 1 to 30 percent. The novel bonder for lithium ion batteries has the characteristics of large specific surface area, high absorption capacity and high film formability. The charge and discharge capacity of the lithium ion batteries prepared by the bonder of the invention can be improved, while cycle characteristics are improved.

Description

technical field [0001] The invention relates to a novel battery binder, especially a binder suitable for lithium-ion battery systems. Background technique [0002] With the continuous development of the economy, it will inevitably lead to the depletion of natural resources such as oil and coal, environmental pollution and the aggravation of the global greenhouse effect. Human beings must grasp the balance between economic growth, environmental protection and energy supply. At present, the annual consumption of energy in the world Converted to about 8 billion tons of oil, 90% of which are fossil fuels. According to the current annual consumption rate of energy in the world, it will be exhausted in about 100 to 200 years. The comprehensive development and utilization of new energy, energy-saving technology and environmental protection technology has become a very urgent topic. [0003] Due to its high voltage, large capacity, low self-discharge rate, no memory effect, no tox...

Claims

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Application Information

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IPC IPC(8): H01M4/62C09J127/16C09J11/02
CPCY02E60/10
Inventor 吕耀康陈静王晓娟苏虹冯云龙
Owner ZHEJIANG NORMAL UNIVERSITY
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