Flexible lithium metal cell negative pole and preparation method thereof
A lithium metal battery, lithium metal technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of lithium metal negative electrode volume expansion without a better solution, can not completely solve the problem of lithium metal negative electrode volume expansion, to achieve inhibition Effects of dendrite growth, improvement of safety performance and cycle life, and improvement of mechanical properties
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Embodiment 1
[0016] Melt solid metal lithium at 200°C, and then put carbon nanotube paper into liquid lithium to form lithium metal-carbon nanotube composite paper flexible battery negative pole (the content of lithium metal is 98wt.%); the flexible battery negative pole A half-cell with copper current collector is tested, the electrolyte is lithium hexafluorophosphate, ethylene carbonate and diethyl carbonate solution, and the test current is 2.0mAcm -2 .
[0017] The test results show that during the cycle, the volume expansion of the negative electrode of the flexible battery is 1.0%, and no dendrites appear on the lithium metal negative electrode within the cycle range of 400 cycles; All indicators were reduced within 1.0%.
Embodiment 2
[0019] Solid metal lithium is melted at 250°C, and then the graphene paper is put into liquid lithium to form a lithium metal-graphene composite paper flexible battery negative pole (the content of lithium metal is 85wt.%); the flexible battery negative pole is combined with copper The current collector constitutes a half-cell for testing, the electrolyte is a solution of lithium trifluoromethanesulfonate, 1,3-dioxane and 1,2-dimethoxyethane, and the test current is 30mAcm -2 .
[0020] The test results show that during the cycle, the volume expansion of the negative electrode of the flexible battery is 17%, and no dendrites appear on the lithium metal negative electrode within the cycle range of 1000 cycles; All indicators were reduced within 10.0%.
Embodiment 3
[0022] At 1350°C, the solid metal lithium is gasified, and then infiltrated into the oxidized carbon foam spheres to form a lithium metal-foam carbon spherical flexible battery negative electrode (the content of lithium metal is 99.9wt.%); the flexible battery negative electrode is combined with copper collector The fluid constitutes a half-cell for testing, the electrolyte is lithium trifluoromethanesulfonate, dimethoxymethane and tetrahydrofuran solution, and the test current is 500mAcm -2 .
[0023] The test results show that during the cycling process, the volume expansion of the negative electrode of the flexible battery is 50%, and no dendrites appear on the lithium metal negative electrode within the cycle range of 20 cycles; The indicators are reduced within 50.0%.
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