Lithium supplementing method for negative electrode and application of lithium supplementing method
A negative electrode and lithium supplementing technology, applied to the negative electrode lithium supplementing method and its application field, can solve problems such as easy agglomeration, achieve the effect of not easy to agglomerate, solve difficult dispersion, avoid being oxidized or react with water
Active Publication Date: 2021-11-02
HUNAN LIFANG NEW ENERGY SCI & TECH
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Problems solved by technology
[0004] One of the purposes of the present invention is to provide a lithium supplementation method for the negative electrode, which solves the problem that the slurry is difficult to disperse in the current neg
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Embodiment 1
[0043] A method for replenishing lithium at a negative electrode, comprising the following steps:
[0044] S1. Coating a layer of conductive carbon or a conductive layer mixed with graphite on the copper foil to make a negative electrode sheet, at least one surface of the positive electrode current collector is coated with a positive electrode active material to make a conventional positive electrode sheet, and place the positive electrode sheet and the separator in sequence 1. Winding or stacking the negative electrode sheet to make a battery, charging the battery to make the negative electrode of the battery decompose lithium to obtain lithium crystals; wherein, the charging current can be 0.01 ~ 3C, the voltage can be 2 ~ 5V, and the charging time can be 1min~12h;
[0045] S2, peeling off the obtained lithium crystal from the copper foil, and peeling off the conductive carbon layer on the copper foil together;
[0046] S3, ball milling the lithium crystals and carbon obtai...
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Abstract
The invention provides a lithium supplementing method for a negative electrode and application o fthe lithium supplementing method. The method comprises the following steps: S1, manufacturing a battery, charging the battery, and separating lithium from the negative electrode of the battery to obtain a lithium crystal; S2, stripping the lithium crystal obtained in the step S1; and S3, carrying out ball milling on the lithium crystal obtained in the step S2, preparing a mixed solution form the lithium crystal, and coating at least one surface of a negative electrode, which is to be supplemented with lithium, with the mixed solution, thereby completing lithium supplementation of the negative electrode. Compared with conventional lithium supplementation via lithium powder, the lithium supplementation method adopts the compact granular lithium crystal for lithium supplementation; since the specific surface area of the compact granular lithium crystal is far smaller than the specific surface area of the lithium powder and particles are not prone to agglomeration, the problem that the lithium powder is prone to agglomeration in an early mixing process is solved; and the lithium crystal has the advantage of being large in particle size, so the lithium crystal is easier to be uniformly dispersed, and therefore, the problem that slurry is difficult to disperse in a current negative electrode lithium supplementing technology is solved.
Description
technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium replenishing method for a negative electrode and an application thereof. Background technique [0002] Lithium-ion batteries are widely used because of their high working voltage, high specific energy, long cycle life and no memory effect. At present, lithium-ion batteries have been widely used in 3C digital consumer electronics products and power batteries and other fields. However, with the popularization of the application of lithium-ion batteries, the performance requirements of consumers for lithium-ion batteries continue to increase. Due to the limitation of energy itself, graphite anodes can no longer meet the needs of consumers, and silicon has a higher energy density. With more and more attention, silicon anode is also expected to become an anode material that can effectively improve the energy density of lithium-ion batteries. However, the cycle efficiency of...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01M4/1393H01M4/1395H01M4/38H01M4/587H01M10/0525H01M10/42
CPCH01M4/1393H01M4/1395H01M10/4235H01M4/386H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 刘良海
Owner HUNAN LIFANG NEW ENERGY SCI & TECH