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Pulse charger is a type of dynamic charging that changes the charging current and voltage with the capacity and internal resistance of the battery itself. It achieves a balance between charging and discharging under this dynamic condition, and can also remove sulfates that appear in the battery after long-term charging and discharging, thereby restoring the battery's capacity. You can go online and take a look at the pulse charger from Shenzhen Meikade Technology Co., Ltd. There are detailed instructions on the official website.

Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and non-aqueous electrolyte solutions. In 1912, lithium-metal batteries were first developed by Gilbert N Lewis proposed and studied. In the 1970s, M.S. Whittingham proposed and began researching lithium-ion batteries. Due to the highly reactive chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. So, lithium batteries have not been applied for a long time. With the development of science and technology, lithium batteries have become mainstream now.

Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium-ion batteries. Lithium ion batteries do not contain metallic lithium and are rechargeable. The fifth generation product of rechargeable batteries, lithium metal batteries, was born in 1996. Their safety, specific capacity, self discharge rate, and cost-effectiveness are all superior to lithium-ion batteries. Due to its own high-tech requirements, only a few companies from different countries are currently producing this type of lithium metal battery.

Lithium metal batteries:

Lithium metal batteries generally use manganese dioxide as the positive electrode material, metallic lithium or its alloy metal as the negative electrode material, and non-aqueous electrolyte solutions.

Basic principles of lithium batteries

Basic principles of lithium batteries

Discharge reaction: Li+MnO2=LiMnO2

Lithium ion battery:

Lithium ion batteries generally use lithium alloy metal oxides as the positive electrode material, graphite as the negative electrode material, and non-aqueous electrolytes.

The reaction that occurs on the charging positive electrode is

LiCoO2==Li (1-x) CoO2+XLi+Xe - (electronic)

The reaction that occurs on the charging negative electrode is

6C+XLi++Xe-=LixC6

Total reaction of rechargeable battery: LiCoO2+6C=Li (1-x) CoO2+LixC6

positive electrode

Positive electrode material: There are many optional positive electrode materials, and mainstream products mostly use lithium iron phosphate. Comparison of different positive electrode materials:

LiCoO2

3.7V

140mAh/g

Li2Mn2O4

4.0V

100mAh/g

LiFePO4

3.3V

100mAh/g

Li2FePO4F

3.6V

115mAh/g

Positive electrode reaction: Lithium ion insertion during discharge and lithium ion deintercalation during charging. When charging: LiFePO4 → Li1-xFePO4+xLi++xe - When discharging: Li1-xFePO4+xLi++xe - → LiFePO4.

negative pole

Negative electrode material: mostly graphite is used. New research has found that titanate may be a better material.

Negative electrode reaction: lithium ion deintercalation during discharge and lithium ion insertion during charging.

When charging: xLi++xe -+6C → LixC6

During discharge: LixC6 → xLi++xe -+6C

Lithium batteries were first used in pacemakers. The advantages of lithium batteries, such as extremely low self discharge rate and gentle discharge voltage, enable implanted pacemakers to operate for a long time without the need for recharging. Lithium batteries generally have a nominal voltage higher than 3.0 volts, making them more suitable as integrated circuit power supplies. Manganese dioxide batteries are widely used in calculators, digital cameras, and watches.

In order to develop varieties with better performance, people have conducted research on various materials to manufacture unprecedented products.

In 1992, Sony successfully developed lithium-ion batteries. Its practicality greatly reduces the weight and volume of portable electronic devices such as mobile phones, laptops, and calculators.

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