Lithium ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve problems such as low specific capacity, low loading rate of tin disulfide, poor cycle stability, etc.

CN111384387AActive Publication Date: 2020-07-07HANGZHOU DEBIAO NEW ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-07-07

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Abstract

The invention relates to a lithium ion battery and a preparation method thereof. The lithium ion battery negative electrode active material is an MOF-coated tin disulfide-loaded Mxene composite material, wherein MOF is a metal carbon framework, and Mxene is a material with a two-dimensional layered structure; the MOF and tin disulfide loaded Mxene are compounded to form a double-carbon framework material, and a more stable lithium ion de-intercalation carrier is formed; the MOF is used as a shell frame to provide a lithium ion transmission channel and provide a skeleton supporting effect, tindisulfide is prevented from volume collapse and pulverization in the charging and discharging process, the layered structure has more excellent stability, tin disulfide loading is facilitated, the Li+de-intercalation number is increased, and the specific capacity of tin disulfide can be greatly improved.
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Description

technical field

[0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery with high specific capacity and high stability and a preparation method thereof. Background technique

[0002] Tin-based materials compared to graphite materials (372mAhg -1 ) has a super high theoretical specific capacity, the theoretical specific capacity is 1000mAhg -1 It is expected to replace graphite as the negative electrode material of the next generation of lithium-ion batteries. The bond energy of tin disulfide in tin-based materials is lower than that of other tin-based materials, and it can perform alloying / degolding reactions better, but tin disulfide As a negative electrode material, a huge volume change will occur during the alloying / degolding process, which will cause pulverization at the place where it is recombined with the current collector, reducing the contact area with the current collector, and has a significant impact on the atte...

Examples

Embodiment 1

[0038] 1) Put 0.2g of Mxene two-dimensional carbon material into 0.1mol / l15-crown-5 electrolyte additive for pre-softening treatment, then disperse in 0.1mol / l hydrofluoric acid solution and stir for 12h; filter, wash, and dry;

[0039] 2) Put the product of step 1) in 50ml of alcohol solution, add 0.75mol / l cetyltrimethylamine bromide, and stir at constant temperature for 5h;

[0040] 3) Disperse the product of step 2) in ethanol and stir for 2 h, then add pentahydrate, tin chloride and thioacetamide and continue stirring for 2 h;

[0041]4) Heat the product in step 3) in a water bath for 3 h, wash with ethanol, and dry in a vacuum oven for 8-10 h, with the temperature controlled at 80 °C;

[0042] 5) Put the MOF precursor in the 15-crown-5 electrolyte additive with a concentration of 0.5mol / l and stir for 3 hours, then disperse in the alcohol solution, and then put the product of step 4) into the alcohol solution of the MOF precursor, the original bit synthesis of MOF;

[...

Embodiment 2

[0047] 1) Put 0.2g Mxene two-dimensional carbon material into 5mol / l 15-crown-5 electrolyte additive for pre-softening treatment, then disperse in 1.5mol / l hydrofluoric acid solution and stir for 12h; filter, wash, and dry;

[0048] 2) Put the product of step 1) in 50ml of alcohol solution, add 0.75mol / l cetyltrimethylamine bromide, and stir at constant temperature for 5h;

[0049] 3) Disperse the product of step 2) in ethanol and stir for 2 h, then add pentahydrate, tin chloride and thioacetamide and continue stirring for 2 h;

[0050] 4) Heat the product in step 3) in a water bath for 3 h, wash with ethanol, and dry in a vacuum oven for 8-10 h, with the temperature controlled at 80 °C;

[0051] 5) Put the MOF precursor in the 12-crown-4 electrolyte additive and stir for 3 hours, then disperse it in the alcohol solution, then put the product of step 4) into the alcohol solution of the MOF precursor, and synthesize MOF in situ;

[0052] 6) Heat the product of step 5) to 100°C...

Embodiment 3

[0056] 1) Put 0.2g of Mxene two-dimensional carbon material into 12-crown-4 electrolyte additive for pre-softening treatment, then disperse in 3mol / l hydrofluoric acid solution and stir for 12h; filter, wash and dry;

[0057] 2) Put the product of step 1) in 50ml of alcohol solution, add 0.75mol / l cetyltrimethylamine bromide, and stir at constant temperature for 5h;

[0058] 3) Disperse the product of step 2) in ethanol and stir for 2 h, then add pentahydrate, tin chloride and thioacetamide and continue stirring for 2 h;

[0059] 4) Heat the product in step 3) in a water bath for 3 h, wash with ethanol, and dry in a vacuum oven for 8-10 h, with the temperature controlled at 80 °C;

[0060] 5) Put the MOF precursor in 2mol / l 15-crown-5 electrolyte additive and stir for 3 hours, then disperse in the alcohol solution, then put the product of step 4) into the alcohol solution of the MOF precursor, and synthesize MOF in situ ;

[0061] 6) Heat the product of step 5) to 100°C with...