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Dry method for preparing lithium battery positive and negative plates

A positive and negative electrode sheet, lithium battery technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of high solvent cost, difficult recycling, large pollution, etc., to reduce the specific surface area and reduce side reactions , to avoid the effect of difficult recycling

Active Publication Date: 2021-02-26
NANJING BOCHI NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention proposes a dry method for preparing positive and negative electrodes of lithium batteries, which solves the problems of high cost of solvents used in the production of lithium batteries, difficult recycling, and large pollution; at the same time, solid electrolyte powder is added to the positive and negative electrodes, which can reduce the battery life. Polarization, reducing battery impedance, in addition to improving battery performance, it also helps to reduce or even eliminate the addition of electrolyte, which is conducive to solving the safety problems caused by the use of organic electrolyte in lithium batteries

Method used

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  • Dry method for preparing lithium battery positive and negative plates
  • Dry method for preparing lithium battery positive and negative plates
  • Dry method for preparing lithium battery positive and negative plates

Examples

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preparation example Construction

[0060] The preparation method of the polymer composite solid electrolyte is as follows:

[0061] (1) mixing polyphenylene sulfide particles with lithium salt;

[0062] (2) adding an organic quinone electron acceptor to the above mixture, the oleyl quinone electron acceptor;

[0063] Then the mixture was placed in a sealed reactor for reaction, and then cooled to room temperature to obtain a polymer composite solid electrolyte.

[0064] The lithium salt is lithium hydroxide and / or lithium carbonate;

[0065] The mass ratio of polyphenylene sulfide and lithium hydroxide and / or lithium carbonate described in step (1) is 100:(15-50); The mixing is that the mixture is made into powder with a particle size of 0.5-2 μm by jet milling , mix well.

[0066] The mass ratio of the polyphenylene sulfide to the organic quinone electron acceptor in step (2) is 100:(40-80). The reaction condition of the reaction kettle is that the temperature is 200-350° C. and the time is 0.5-2 hours.

Embodiment 1

[0068] A dry method for preparing lithium battery positive and negative plates, the steps are as follows:

[0069] (1) Preparation of positive pole piece:

[0070] a) Weighing 2wt% of carbon black and 5wt% of PAA, using a mixer with strong shear force to mix at a speed of 300r / min for 5h, and controlling the stirring temperature to 20°C;

[0071] b) Then use the jet mill to mechanically mix the dry powder in step a), the inlet pressure reaches 0.5MPa, and the feeding pressure is 0.5MPa;

[0072] c) adding the material obtained in step b) to 90wt% active material LiMn 2 o 4 and 3wt% polymer solid electrolyte powder, using a stirrer to mix at a speed of 50r / min for 2h, and control the stirring temperature to 20°C;

[0073] d) Add the material obtained in step c) to calcium stearate accounting for 1 wt% of the total powder mass, use a mixer to mix at a speed of 50 r / min for 1 hour, and control the stirring temperature to 20° C.;

[0074] e) extruding the material obtained in ...

Embodiment 2

[0091] A dry method for preparing lithium battery positive and negative plates, the steps are as follows:

[0092] (1) Preparation of positive pole piece:

[0093] a) Weigh 2wt% of conductive agent carbon black, 1wt% of CNT, and 8wt% of PVDF binder, use a mixer with strong shear force to mix at 500r / min for 2h, and control the stirring temperature at 40°C;

[0094] b) Then use the jet mill to mechanically mix the dry powder in step a), the inlet pressure reaches 1.0MPa, and the feeding pressure is 0.8MPa;

[0095] c) adding 85 wt% active material LiCoO to the material obtained in step b) 2 Mix with 4wt% NASICON solid electrolyte powder at 100r / min for 0.75h with a stirrer, and control the stirring temperature at 40°C;

[0096] d) Add the material obtained in step c) to polyethylene wax accounting for 2wt% of the total mass of the powder, use a stirrer to mix at 100r / min for 1h, and control the stirring temperature at 30°C;

[0097] e) extruding the material obtained in step...

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Abstract

The invention discloses a method for preparing positive and negative plates of a lithium battery by a dry method, and the method comprises the following steps: mixing an active substance, a conductiveagent, a binder and solid electrolyte powder according to a certain proportion and a certain sequence in a solvent-free manner, uniformly mixing by using a stirrer, and performing mechanical mixing by using a jet mill; extruding the uniform dry powder into continuous sheets by using a screw extruder, and finally rolling the continuous sheets on a current collector at high temperature for multipletimes to form the dry electrode. The invention solves the problems of high cost, difficult recovery and heavy pollution of the solvent used in the existing lithium battery production; meanwhile, thesolid electrolyte powder is added into the positive electrode and the negative electrode, so that the polarization of the battery can be reduced, the battery impedance is reduced, the battery performance is improved, electrolyte is reduced or even not added, and the safety problem caused by using organic electrolyte by the lithium battery is solved.

Description

Technical field: [0001] The invention belongs to a lithium battery manufacturing process, and in particular relates to a dry method for preparing positive and negative plates of a lithium battery. Background technique: [0002] The traditional method of using solvents to prepare positive and negative electrodes is cumbersome, and the solvents used in the positive electrodes are toxic, and the recycling cost is high and difficult. In addition to the simplicity of the process, compared with the wet process, the electrode obtained by the dry process has better bonding performance and adhesion under the conditions of high temperature and electrolyte, and improves the energy density. This unique electrode process technology helps to suppress carbon dioxide pollution during battery electrode manufacturing. The dry electrode preparation process is more environmentally friendly by eliminating the use of solvents, and the associated coating slurry and drying complexities. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04H01M10/0525H01M10/0562H01M10/058
CPCH01M4/0435H01M4/139H01M10/058H01M10/0525H01M10/0562Y02E60/10Y02P70/50
Inventor 周翔杨凡晁流程飞左连勇顾冬生付强
Owner NANJING BOCHI NEW ENERGY CO LTD
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