The difference between lithium manganese oxide batteries and lithium cobalt oxide batteries
I. Lithium Manganese Oxide Battery
Lithium manganese oxide batteries are batteries that use lithium manganese oxide as the positive electrode. Their nominal voltage ranges from 2.5 to 4.2V. Lithium manganese oxide batteries are widely used due to their low cost and good safety. As a positive electrode material, the structure and performance of lithium manganese oxide batteries are closely related to the raw materials and calcination process conditions. Different synthesis conditions, as well as the types and amounts of doping elements, can all lead to significant differences in the electrochemical performance of the product.
1. Technical parameters of lithium manganese oxide batteries
Output voltage range: 2.5~4.2V; Nominal capacity: 7500mAh
Standard continuous discharge current: 0.2C
Maximum continuous discharge current: 1C
Operating temperature: Charging: 0~45℃
Discharge: -20~60℃
Lead wire type: GB standard UL3302/26#, 50mm long, white wire is 10KNTC
Protection board parameters: (Each parameter can be set according to the customer's product)
Overcharge protection voltage: 4.28 ± 0.025V per string
Over-discharge protection voltage: 2.4 ± 0.1 V
Overcurrent value: 2~4A
2. Advantages and disadvantages of lithium manganese oxide batteries
The advantages of lithium manganese oxide batteries are: low-temperature resistance, good rate performance, and relatively easy manufacturing. The disadvantages are: the material itself is unstable, requiring the use of other materials in combination; poor high-temperature performance; poor cycle performance; and rapid degradation. These disadvantages of lithium manganese oxide stem from the properties of manganese. However, the widespread availability of manganese gives it a significant cost advantage.
II. Lithium Cobalt Oxide Batteries
Lithium cobalt oxide batteries have a stable structure, high capacity ratio, and outstanding overall performance, but they have poor safety and very high cost. They are mainly used in small and medium-sized cells and are widely used in small electronic devices such as laptops, mobile phones, and MP3/4 players. The nominal voltage is 3.7V.
1. Technical parameters of lithium cobalt oxide batteries
Standard discharge duration current: 0.2C
Maximum discharge duration current: 0.5C
Operating temperature: Charging: 0~45℃
Discharge: -20~60℃
Product dimensions: MAX15*29*51mm
Finished product internal resistance: ≤180mΩ
Lead wire type: GB standard wire UL1571/26#, wire length 100mm
Protection parameters: Overcharge protection voltage/per string 4.28±0.025V
Over-discharge protection voltage: 2.4 ± 0.1 V
Overcurrent value: 3~7A
The working principle of a lithium cobalt oxide battery is based on the battery reaction formula. The negative electrode reaction is LixC6-xe-=C6+xLi+, and the positive electrode reaction is Li1-xCoO2+xLi++xe-=LiCoO2. During charging, the cathode and anode reactions are exactly opposite to the negative and positive electrode reactions. Therefore, A is the negative electrode and B is the positive electrode.
2. Characteristics of lithium cobalt oxide batteries: ( 1) Excellent electrochemical performance; (2) Excellent processing performance; (3) High tap density, which helps to improve the volumetric capacity of the battery; (4) Stable product performance and good consistency.
After long-term development, lithium cobalt oxide batteries have formed four product lines: cylindrical batteries, polymer pouch batteries, aluminum-cased batteries, and steel-cased batteries. These products are used in the high-end, mid-range, and low-end markets, respectively. Low-end customers for lithium cobalt oxide batteries are mainly export-oriented manufacturers of MP3 players, MP4 players, GPS devices, and digital photo frames, as well as second- and third-tier domestic mobile phone manufacturers and counterfeit mobile phone manufacturers. These manufacturers are mainly concentrated in the Pearl River Delta region, and their primary demand is for steel-cased batteries, with some demand for aluminum-cased and liquid pouch batteries as well.
With the advancement of marketization, breakthroughs in key materials and technologies, and the exploration of application areas, the neglected situation of lithium manganese oxide batteries and lithium cobalt oxide batteries is gradually changing.
