All-solid-state electrolyte, composition thereof, electrode and all-solid-state lithium ion battery
A composition and all-solid-state technology, applied in the direction of non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve problems such as difficult to meet practical application requirements, low room temperature conductivity, etc., and achieve excellent battery cycle performance, high mechanical strength Effect of strength and excellent specific capacity
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[0027] Wherein, the preparation method of the all-solid electrolyte preferably includes:
[0028] Mix the PVDF-HFP and the first lithium salt in an organic solvent (for example, magnetic stirring at 15-30°C for 10-36h), and then introduce the perfluoropolyether and mix (for example, at 15-30°C magnetic stirring for 10-60 min), and then remove the solvent (for example, heating and drying at 50-90° C. to form a film) to obtain the all-solid electrolyte.
[0029] Wherein, the organic solvent can be selected from N-methylpyrrolidone (NMP), N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO), benzene, carbon tetrachloride, chloroform, toluene One or more of , xylene, etc., the amount of which can be varied within a wide range, for example, relative to 100 parts by weight of PVDF-HFP, the amount of the organic solvent used is 200-400 parts by weight.
[0030] The all-solid electrolyte obtained by the invention has higher ion conductivity, lower crystallinity and suitable flexibil...
Embodiment 1
[0057] This example is used to illustrate the all-solid electrolyte, positive electrode and battery of the present invention.
[0058] Preparation of all solid electrolyte:
[0059] (1) In 300 parts by weight of N-methylpyrrolidone (NMP), first add 100 parts by weight of polymer PVDF-HFP-1 and 55 parts by weight of LiN(CF 3 SO 2 ) 2 , stir magnetically at room temperature (about 25°C) for 24 hours, and mix well;
[0060] (2) Add 80 parts by weight of perfluoropolyether 1# to the above-mentioned mixed material, and continue to stir magnetically at room temperature (about 25°C) for 25 minutes to mix uniformly to obtain an electrolyte slurry;
[0061] (3) The obtained electrolyte slurry was dried at 60° C. to form a film, and cut into 19 mm discs with a thickness of 80 μm, which were designated as all-solid electrolyte membrane S1.
[0062] Preparation of positive electrode:
[0063] (1) The positive electrode active material LiFePO 4 , the electrolytic slurry (consumption ...
Embodiment 2
[0068] This example is used to illustrate the all-solid electrolyte, positive electrode and battery of the present invention.
[0069] Preparation of all solid electrolyte:
[0070] (1) In 250 parts by weight of NMP, first add 100 parts by weight of polymer PVDF-HFP-2 and 50 parts by weight of LiN(CF 3 SO 2 ) 2 , stir magnetically at room temperature (about 25°C) for 24 hours, and mix well;
[0071] (2) Add 50 parts by weight of perfluoropolyether 2# to the above mixed material, and continue to stir magnetically at room temperature (about 25° C.) for 35 minutes to obtain an electrolyte slurry by mixing uniformly;
[0072] (3) The obtained electrolyte slurry was dried at 70° C. to form a film, and cut into 19 mm discs with a thickness of 80 μm, which were designated as all-solid electrolyte membrane S2.
[0073] Preparation of positive electrode:
[0074] (1) The positive electrode active material LiFePO 4 , the electrolytic slurry (consumption is based on the remaining a...
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