Radical-trapping lithium battery anode

A free radical and lithium battery technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as adverse effects on battery cycle performance, degradation of battery cycle performance, and destruction of the crystal structure of active materials. Integrity, reducing dissolution, and improving cycle performance

Inactive Publication Date: 2019-05-17
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the positive active material uses LiNi 0.5 mn 1.5 o 4 When the carbonate electrolyte is cycled at a high voltage, the carbonate solvent molecules form free radicals through proton-coupled electron transfer (J. Am. Chem. Soc., 2015, 137 (10), 3533-3539). The base consumes the electrolyte through further reactions, and the coordination between the reaction product and the metal ions in the positive active material leads to the dissolution of the transition metal in the positive active material and destroys the crystal structure of the active material. The above-mentioned side reactions will lead to the cycle of the battery performance degradation
[0003] The influence of free radicals is not considered in the existing methods for preparing the positive electrode of lithium batteries, and the generation of free radicals at the positive electrode of high-voltage lithium batteries will have an adverse effect on the cycle performance of the battery. Electrolyte contact can effectively reduce electrolyte decomposition, which is expected to improve battery performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 0.8 g LiNi 0.5 mn 1.5 o 4 The positive electrode active material and 0.1 gram of acetylene black conductive agent are ground evenly in a mortar, the preparation concentration is the alkaline sodium lignosulfonate binder aqueous solution containing phenol group in the side chain of 20%, the obtained binder aqueous solution Slowly add to the uniformly mixed powder of the positive electrode active material and the conductive agent and continue to grind, the mass ratio of the binder to the positive electrode active material is 1:8, the obtained uniform slurry is coated on a clean aluminum foil, and the electrode The sheet was left at room temperature for 2 hours, then further dried in an oven at 60°C to remove the solvent, and finally the electrode sheet was transferred to a vacuum oven at 90°C to dry under vacuum for 24 hours.

[0031] The dried pole piece is prepared into a pole piece with a diameter of 14 mm, and a button battery is assembled, the lithium piece is the ...

Embodiment 2

[0033] 0.8 g LiNi 0.5 mn 1.5 o 4 The positive electrode active material and 0.1 gram of acetylene black conductive agent were ground evenly in a mortar, and a polyacrylic acid binder dimethylformamide solution containing phenol groups in the side chain with a concentration of 6% was prepared. The methyl formamide solution is slowly added to the uniformly mixed powder of the positive electrode active material and the conductive agent and continuously ground, the mass ratio of the binder to the positive electrode active material is 1:8, and the obtained uniform slurry is carried out on a clean aluminum foil. For coating, place the electrode piece at room temperature for 24 hours, then further remove the solvent in an oven at 80 °C, and finally transfer the electrode piece to a vacuum oven at 120 °C to dry under vacuum for 48 hours.

[0034] Assemble the processed pole piece into a button battery, the lithium piece is the negative electrode, and the electrolyte is 1 M LiPF 6et...

Embodiment 3

[0036] 0.8 g LiNi 0.5 mn 1.5 o 4 The positive electrode active material and 0.1 gram of acetylene black conductive agent are ground evenly in a mortar, and the preparation concentration is 6% polyacrylic acid binder dimethylformamide solution containing p-trifluoromethylphenol group in the side chain, and the obtained The binder dimethylformamide solution is slowly added to the uniformly mixed powder of the positive electrode active material and the conductive agent and continuously ground, the mass ratio of the binder to the positive electrode active material is 1:8, and the obtained uniform slurry is Coating was carried out on a clean aluminum foil, and the pole piece was placed at room temperature for 24 hours, and then the solvent was further removed in an oven at 80 °C, and finally the pole piece was transferred to a vacuum drying oven at 120 °C for 48 hours under vacuum conditions.

[0037] Assemble the processed pole piece into a button battery, the lithium piece is t...

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Abstract

The invention discloses a radical-trapping lithium battery anode. The lithium battery anode comprises a current collector, an anode active material, a conductive agent, and a binding agent. To reduceadverse effects of the generation of high-voltage lithium battery anode radicals on the cycling performance of a battery, nitroxyl radicals and other groups, which are introduced into a polymer molecule structure of the binding agent, can effectively trap the radicals generated by the anode, reduce the electrolyte composition, and form a stable anode interface layer on the anode to inhibit continued radical generation; the radical-trapping groups comprise the nitroxide radicals and derivatives thereof, phenol and derivatives thereof, benzenediol and derivatives thereof, and hydroxyquinol and derivatives thereof; and the polymer molecule structure comprises a natural polymer adhesive and a synthetic polymer adhesive.

Description

technical field [0001] The invention relates to a functionalized lithium battery positive electrode and a preparation method thereof, in particular to a positive electrode with free radical trapping function and a preparation method thereof. Background technique [0002] Rechargeable lithium-ion batteries have the advantages of high energy density, long cycle life, and low environmental pollution, and have been widely used in electric vehicle power equipment and small energy storage devices. Electric vehicles, power grid energy storage, etc. are increasingly demanding high operating voltage and high energy density lithium-ion batteries. Rechargeable lithium-ion batteries will produce more side reactions at high voltages, such as the dissolution of metal ions in positive active materials and corrosion of aluminum foil. , Oxidative decomposition of the electrolyte. Among them, the oxidative decomposition of the electrolyte will lead to a decrease in the electrolyte content in...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/131H01M4/1391H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 崔光磊王成栋马月徐红霞陈锴张焕瑞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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