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Uniformly-distributed three-dimensional lithium alloy negative electrode and preparation method thereof

A uniform distribution and lithium alloy technology, applied in battery electrodes, lithium batteries, electrical components, etc., can solve the problem of not meeting the safety performance and electrochemical cycle performance of high energy density batteries, the loss of active positive electrode active materials, and the lack of high reactivity. Good and other problems, to achieve the effect of reducing the volume expansion effect, improving the problem of lithium dendrites, and improving safety performance

Active Publication Date: 2022-04-08
四川启睿克科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through a large number of literature and patent research, the metal lithium anode has been modified in the research work, so that it has a certain degree of improvement in the growth of lithium dendrites, volume expansion and the formation of "dead lithium", but it cannot meet the current high energy requirements. Density battery requirements on safety performance and electrochemical cycle performance
In addition, there is still no better way to avoid oxidation in air due to the high reactivity of lithium metal
At the same time, in the battery system, the positive electrode intermediate enters the impurities on the surface of the negative electrode material through the separator, which will lead to the loss of the active positive electrode active material and the blockage of the metal lithium negative electrode surface. At present, this problem has not been well resolved.

Method used

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  • Uniformly-distributed three-dimensional lithium alloy negative electrode and preparation method thereof
  • Uniformly-distributed three-dimensional lithium alloy negative electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] First, Li and Al are treated at a high temperature at 400°C under an inert gas at an atomic ratio of 9:4; to obtain Al 4 Li 9 Alloy material, 50 micron lithium aluminum alloy strip is obtained by rolling, and the surface roughness treatment is carried out to form uniformly distributed convex parts; the 50 micron pure lithium strip is surface treated to obtain grooves, and then the two are processed Composite rolling to form a composite strip. After vacuum heat treatment at 100° C. for 6 hours, the final lithium alloy negative electrode ribbon material was obtained. The negative electrode sheet of the button battery was obtained by a slicing machine, and LiNi 0.8 co 0.1 mn 0.1 o 2 The positive electrode sheet was assembled into a 2032 button cell using EC:DEC:DMC=1:1:1 as the electrolyte, and then the electrochemical performance test was carried out. Test results such as figure 2 shown.

Embodiment 2

[0022] First, Li and Ca are treated at high temperature under inert gas at 300°C in an atomic ratio of 2:1; CaLi 2 Alloy material, 50 micron lithium-calcium alloy strip is obtained by rolling, and the surface roughness treatment is carried out to form uniformly distributed convex parts; the 50 micron pure lithium strip is surface treated to obtain grooves, and then the two are processed Composite rolling to form a composite strip. After vacuum heat treatment at 100° C. for 6 hours, the final lithium alloy negative electrode ribbon material was obtained. The negative electrode sheet of the button battery was obtained by a slicing machine, and LiNi 0.8 co 0.1 mn 0.1 o 2 The positive electrode sheet was assembled into a 2032 button cell using EC:DEC:DMC=1:1:1 as the electrolyte, and then the electrochemical performance test was carried out. Test results such as figure 2 shown.

Embodiment 3

[0024] First, Li and Mg are treated at a high temperature at 500°C under an inert gas at an atomic ratio of 8:2; LiMg solid solution alloy material is obtained, and a 50-micron lithium-magnesium alloy strip is obtained by rolling and surface roughness treatment. Uniformly distributed convex parts; 50 micron pure lithium strip is surface treated to obtain grooves, and then the two are combined and rolled to form a composite strip. After vacuum heat treatment at 100° C. for 6 hours, the final lithium alloy negative electrode ribbon material was obtained. The negative electrode sheet of the button battery was obtained by a slicing machine, and LiNi 0.8 co 0.1 mn 0.1 o 2 The positive electrode sheet was assembled into a 2032 button cell using EC:DEC:DMC=1:1:1 as the electrolyte, and then the electrochemical performance test was carried out. Test results such as figure 2 shown.

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Abstract

The invention discloses a uniformly-distributed three-dimensional lithium alloy negative electrode and a preparation method thereof. The preparation method comprises the following steps: (1) smelting metal lithium and other metals at high temperature to obtain an alloy material; (2) rolling the alloy material through a roller to obtain an alloy belt, and performing roughness treatment on the alloy belt; (3) the pure lithium strip is subjected to surface roughness treatment after being subjected to surface polishing; (4) the treated alloy strip and the pure lithium strip are subjected to composite rolling, the grooves and the protrusions are embedded, and then roller rolling is carried out to obtain a composite strip; and (5) carrying out heat treatment on the rolled composite strip to obtain the uniformly distributed three-dimensional lithium alloy negative electrode material. The cycle life of the three-dimensional lithium alloy negative electrode material prepared by the method is obviously prolonged, and the lithium dendrite problem is obviously improved, so that the safety performance of the battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a uniformly distributed three-dimensional lithium alloy negative electrode and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in daily life. The battery life of smartphones, electric vehicles and other products based on lithium-ion batteries is not satisfactory. There is an urgent need to develop battery systems with higher energy density. Graphite, as a common anode material in lithium-ion batteries, has a relatively low specific capacity (370mAh / g). At present, the actual specific capacity of graphite anode is close to the limit, and the room for further improvement is limited. In order to further increase the energy density of lithium-ion batteries, it is necessary to develop anode materials with high specific capacity (silicon, tin, lithium, etc.) to replace traditional graphite anodes. In contrast, metal li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/052C22C1/02C22C24/00C22F1/16
CPCY02E60/10
Inventor 高剑邓云龙邓金祥王铭
Owner 四川启睿克科技有限公司
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