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A boric acid compound modified lithium ion battery silicon negative electrode and preparation method thereof
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A boric acid compound and lithium-ion battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of electrode coulombic efficiency drop, strong side reactions, lithium consumption, etc., to ensure shape and structure stability, reduce Cracking, the effect of improving the bonding performance
Active Publication Date: 2021-07-20
SUZHOU UNIV
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However, it should be pointed out that nanonization will also bring about a series of other problems: the high specific surface area of the material leads to strong side reactions during the formation of the SEI film on the electrode surface, the decrease in the first Coulombic efficiency of the electrode and the long-term cycle of the battery. severe lithium depletion
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[0028] The method for preparing the silicon negative electrode modified by the above-mentioned boric acid compound comprises the following steps: (a) dissolving the binder in deionized water to form an aqueous binder solution with a mass concentration of 1 to 10 wt %; adding a boric acid compound to the aqueous binder solution, and stirring at 30-80° C. for 1-20 hours to carry out a cross-linking reaction; (c) adding the silicon-based nanomaterial and the conductive agent to the product of step (b), stirring to obtain electrode slurry; (d) after filtering the electrode slurry, spread it on the current collector and dry it. In step (a), the binder is usually dissolved in deionized water at a temperature of 80-95°C.
[0029] The preferred embodiment of the present invention will be described in detail below in conjunction with accompanying drawing:
example 1
[0031] This embodiment provides a method for preparing a boric acid compound modified silicon negative electrode of a lithium-ion battery, which comprises the following steps:
[0032] (a) Measure 19 mL of deionized water into a beaker, weigh 1 g of PVA (commercially available, specification PVA-1799) and pour it into deionized water, stir and dissolve at 90°C, and cool to room temperature to obtain a PVA aqueous solution;
[0033] (b) Weigh 0.1 g of boric acid and add it to the above PVA aqueous solution, stir to dissolve; then stir at 40° C. for 10 h to carry out cross-linking reaction (cross-linking degree is 0.1);
[0034] (c) Weigh 1.8g of nano-silicon (commercially available, specification 100nm, company Shenzhen Kejing), 0.3g of acetylene black, grind evenly, add to the product of step (b), stir for 10h to make it uniformly dispersed to obtain an electrode slurry;
[0035] (d) Spread the electrode slurry evenly on the Cu foil, dry it at 80°C for 12h, and slice it.
[0...
example 2
[0038] This embodiment provides a method for preparing a boric acid compound modified silicon negative electrode of a lithium-ion battery, which is basically the same as in Example 1, except that the binder used is polyethylene glycol (PEG, commercially available, and the specification is PEG -2000), the boric acid compound is boric acid, and the degree of crosslinking is 0.1.
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Abstract
The invention relates to a boric acid compound-modified silicon negative electrode of a lithium-ion battery, which is prepared by adding a binder and a boric acid compound to a mixture of silicon-based nanomaterials and conductive agents; the binder is a hydroxyl-containing water-soluble polymer, the boric acid compound is a mixture of one or more selected from boric acid, borax, and organic borides, and the molar ratio of boron in the boric acid compound to the hydroxyl group in the binder is 0.02 to 0.2 . By selecting a boric acid compound agent with specific chemical structure and performance as a crosslinking agent and surface film-forming agent, and mixing it with the binder system, due to the electron-deficient characteristics of the B element, the boric acid compound can be combined with the hydroxyl group and dehydrated to form a relatively firm The chemical complexes, cross-linking and bridging between the molecular chains of the binder, thereby significantly increasing the strength of the binder, improving the bonding performance of the binder and the interface characteristics of the surface of the silicon powder and the binder.
Description
technical field [0001] The invention belongs to the field of negative electrodes of lithium batteries, and in particular relates to a boric acid compound modified silicon negative electrode of lithium ion batteries and a preparation method thereof. Background technique [0002] High specific energy lithium-ion batteries are critical to solving future vehicle power supplies and large-scale energy storage. Silicon-based anode materials (including pure silicon anode materials and silicon-carbon composite anode materials) have high specific capacity (4200mAh / g), rich materials, Low price and other advantages are an important choice for the development of key anode materials for high specific energy lithium-ion batteries, and have been extensively researched and developed in recent years. However, the silicon-based negative electrode material will produce a huge volume change during the process of intercalating and removing lithium, and the volume expansion will exceed 300%. The...
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