Graphene modified lithium ion battery and preparation method thereof
A lithium-ion battery and graphene modification technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of high resistivity of positive electrodes and low utilization rate of electrode materials, so as to improve electrical conductivity and improve internal heat. big effect
Active Publication Date: 2019-04-19
王立军
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Problems solved by technology
[0011] The purpose of the present invention is to provide a graphene-modified lithium-ion battery and a preparation method thereof, which can optimize the positive electrode slurry and the negative electrode slurry of the battery by adding graphene to the conductive agent of the lithium-ion battery, and improve the positive and negative electrodes of the lithium-ion battery. The conductivity of the negative electrode can reduce the resistance generated by the combination of the positive electrode material of the battery and the positive current collector, and the combination of the negative electrode material and the negative current collector. The problem of low material utilization
Method used
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Embodiment 2
[0077] As an alternative, the rest of the technical content is the same as in Example 1, the difference is that in step S1, lithium iron phosphate nanoparticles, positive electrode mixed conductive agent, polylidene fluoride are prepared according to the mass ratio of 100:2:3:85 Ethylene and deionized water.
Embodiment 3
[0079] As an alternative, the rest of the technical content is the same as in Example 1, the difference is that in step S1, lithium iron phosphate nanoparticles, positive electrode mixed conductive agent, polylidene fluoride are prepared according to the mass ratio of 150:6:7:96 Ethylene and deionized water; in step S2, graphite, negative electrode mixed conductive agent, polyvinylidene fluoride and deionized water are prepared in a mass ratio of 85:1:5:110.
Embodiment 4
[0081] As an alternative, the rest of the technical content is the same as in Example 1, except that: in step S1, the base material of the positive electrode conductive agent is carbon nanofiber; in step S2, the base material of the negative electrode conductive agent is carbon black.
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Abstract
The invention discloses a graphene-modified lithium-ion battery and a preparation method thereof. The battery comprises: a battery casing, a negative electrode insulating sheet, a positive electrode insulating sheet, an electric core and a cap. The cell includes a positive pole piece, a negative pole piece and a diaphragm. The positive electrode sheet includes a positive electrode current collector and a positive electrode material coating. The positive electrode material coating is made of a positive electrode material mixture coated on the surface of the positive electrode current collector. The positive electrode material mixture includes nano-particle positive electrode material, positive electrode binder, positive electrode mixed conductive agent and Positive solvent. The negative electrode sheet includes a negative electrode current collector and a negative electrode material coating, and the negative electrode material coating is made by coating the negative electrode material mixture on the surface of the negative electrode current collector. Wherein, the positive electrode mixed conductive agent includes by weight: 97-99 parts of positive electrode conductive agent base material, 0.2-0.4 part of graphene, 0.2-0.4 part of SP, and 0.2-0.4 part of KS-6.
Description
technical field [0001] The invention belongs to the technical field of rechargeable batteries, and in particular relates to a lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary rechargeable battery that mainly relies on lithium ions to move between the positive electrode and the negative electrode. During the charging and discharging process, lithium ions are intercalated and deintercalated back and forth between the positive and negative electrodes. The interior of the lithium battery adopts a spiral wound or laminated structure, which is composed of a positive electrode, a separator, a negative electrode, an organic electrolyte, and a battery case, and the battery is filled with an electrolyte solution. [0003] The positive electrode material occupies a relatively large proportion in lithium-ion batteries, and the mass ratio of the positive and negative electrode materials is 3:1 to 4:1. Lithium-ion battery cathode materials occupy a co...
Claims
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IPC IPC(8): H01M10/0525H01M4/62H01M2/26H01M10/058H01M10/0587H01M50/531H01M50/534H01M50/538
CPCH01M4/624H01M4/625H01M10/0525H01M10/058H01M10/0587H01M50/531Y02E60/10Y02P70/50
Inventor 王立军
Owner 王立军