A kind of negative pole of lithium ion battery and its preparation method and lithium ion battery
A lithium ion battery and negative electrode technology, applied in the field of lithium ion battery negative electrode and its preparation, can solve problems such as hidden safety hazards and battery failure, achieve easy operation, ensure service life and safety performance, avoid SEI film decomposition and negative electrode current collectors The effect of oxidative dissolution
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[0022] The present invention also provides a method for preparing the negative electrode of the lithium ion battery, comprising the following steps:
[0023] S10, mixing the perovskite solid electrolyte with a binder and a solvent to prepare an electrolyte slurry; coating the electrolyte slurry on the surface of the negative electrode current collector, and drying and rolling to obtain a current collector with an electrolyte coating on the surface ;
[0024] S20, coating the negative electrode slurry corresponding to the negative electrode material layer on the surface of the current collector with the electrolyte coating obtained in step S10, and drying and rolling to obtain the negative electrode of the lithium ion battery. The preparation method of the negative electrode of the lithium ion battery provided by the invention has the advantages of simple process and easy operation.
[0025] Specifically, according to the method of the present invention, an electrolyte slurry ...
Embodiment 1
[0032] The perovskite solid electrolyte material is Li 0.5 La 0.5 TiO 3 , the median particle size is 0.2 μm, the negative electrode active material is modified artificial graphite, and the median particle size is 15 μm.
[0033] (1) Use water as solvent, use CMC and SBR as binder, press Li 0.5 La 0.5 TiO 3 : CMC: SBR: water = 100:5:5:200 weight ratio to prepare electrolyte slurry; put 2L of the electrolyte slurry in the slit coating equipment, adjust the coating machine blade spacing to 30μm, the electrolyte slurry The material is uniformly and intermittently coated on both sides of the copper foil (copper foil size: width 160mm, thickness 16μm), dried at 120°C, and pressed in a roller press under a pressure of 5MPa to obtain a surface with a thickness of 1 μm electrolyte-coated copper foil current collector.
[0034] (2) 940 grams of negative active material artificial graphite (94 wt %), 30 grams of binder CMC (3 wt %) and 30 grams of binder SBR (3 wt %) were added to...
Embodiment 2
[0037] The lithium-ion battery negative electrode J2 and lithium-ion battery A2 of this embodiment are prepared by the same steps as in Example 1, except that:
[0038] In step (1), Li with a median particle size of 0.2 μm is used 0.32 La 0.56 Nb 2 O 6 As the perovskite-type solid electrolyte material of this example, Li in Example 1 is replaced 0.5 La 0.5 TiO 3 .
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