What is a Lithium Ion Battery?

Lithium-ion batteries are a type of secondary battery (rechargeable battery) that rely on lithium ions to move between the positive and negative electrodes to work. During the charge and discharge process, Li + is intercalated and deintercalated between the two electrodes: during charging, Li + is deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

Lithium-based batteries are divided into

Lithium-ion batteries are easily confused with the following two types of batteries:

(1) Lithium battery: Metal lithium is used as the negative electrode.

(2) Lithium-ion battery: use non-aqueous liquid organic electrolyte.

(3) lithium ion

In 1970, Exxon's MS Whittingham made the first lithium battery using titanium sulfide as the positive electrode material and metallic lithium as the negative electrode material. The cathode material for lithium batteries is

Steel shell / aluminum shell / cylindrical / flexible packaging series:

(1) Positive electrodeThe active material is generally lithium manganate or lithium cobaltate, lithium nickel cobalt manganate materials, and electric bicycles generally use lithium nickel cobalt manganate (commonly known as ternary) or ternary + small amount of lithium manganate, pure Lithium manganate and

According to the different electrolyte materials used in lithium-ion batteries, lithium-ion batteries are divided into liquid lithium-ion batteries (Liquified Lithium-Ion Battery (LIB) for short) and polymer lithium-ion batteries (Polymer Lithium-Ion Battery (PLB) for short).

Li-ion battery

Rechargeable lithium-ion batteries are modern for mobile phones, laptops, etc.

Lithium Ion Battery

Mechanism of action

The positive electrode materials of lithium batteries include lithium cobaltate LiCoO2, ternary materials Ni + Mn + Co, lithium manganate LiMn2O4 plus a conductive agent and a binder, and coated on aluminum foil to form a positive electrode. The negative electrode is layered graphite plus a conductive agent and a binder. The agent is coated on the copper foil base tape, and the more advanced anode layered graphite particles have adopted nano-carbon.

1. Pulping: Mix the powdered positive and negative electrode active materials with special solvents and binders, and stir them to make a slurry of positive and negative electrode materials.

2. Coating film: The positive and negative electrode pastes are evenly coated on the surface of the metal foil by an automatic coating machine, and then automatically cut into positive and negative electrode pieces after automatic drying.

3. Assembly: According to the order of positive electrode sheetseparatornegative electrode sheetseparation of the electrolyte from the top to the bottom through the electrolyte injection process, sealing, and positive and negative electrode welding, the battery assembly process is completed and the finished battery is made.

4. Formation: Place the finished battery in a test cabinet for charge and discharge test, and select qualified finished batteries for shipment ^[4]

For the assessment of the safety performance of lithium-ion batteries, very strict standards are specified internationally. A qualified lithium-ion battery should meet the following conditions in terms of safety performance:

(1)

Because incorrect use will reduce life and may even cause an explosion, lithium-ion batteries are designed with multiple protection mechanisms.

The demand for lithium-ion batteries focuses on the downstream conditions of mobile phones and notebooks. The total domestic mobile phone production in the first five months of 2013 was 558 million units, a year-on-year increase of 22.02%, of which May production was 123 million units, a year-on-year increase of 32.80%. Demand for the mobile phone market is better. During the same period, the total domestic notebook computer output was 95.268 million units, an increase of 3.86% year-on-year, of which May output was 17.56334 million units, a decrease of 8.12% year-on-year. The overall performance of the notebook market is modest. In view of the better performance of the mobile phone market, we believe that the demand for the lithium battery industry in 2013 is expected to maintain a steady growth in general.

In addition, the separator, as one of the four key raw materials for lithium-ion batteries, benefits from the downstream

China's first mandatory standard for lithium-ion batteries was officially implemented on August 1, 2015.

In order to strengthen the management of the lithium-ion battery industry, improve the development level of the industry, guide the industrial transformation and upgrading and structural adjustment, and promote the sustainable and healthy development of the lithium-ion battery industry, on December 11, 2015, the Ministry of Industry and Information Technology issued the "Regulations for the Li-ion Battery Industry" The draft clarified the access rules for lithium-ion battery companies and products ^[3] .