Rechargeable Lithium Battery

The core difference between the two lies in the negative electrode material and working mode.

Primary lithium battery: The core is that the metal lithium negative electrode participates in the irreversible discharge reaction; the structure is simpler (especially button batteries), but the sealing requirements are extremely high; the electrolyte system is diversified; the negative electrode current collector needs to be compatible with metal lithium; the diaphragm needs to withstand the enhanced originality of metal lithium; there is no requirement for cycle life.

Rechargeable lithium battery (lithium-ion battery): The core is the embedding/de-embedding of lithium ions in the positive and negative electrode material structure; the negative electrode is an embedded compound such as graphite, not a single metal lithium; a fine porous diaphragm is required to achieve ion conduction and electronic insulation; the structure is relatively complex, and the coating thickness, porosity, etc. need to be precisely controlled; usually includes protection mechanisms such as safety valves.

1. Storage optimization
Ideal storage state
Power control: Maintain 40-60% power (SOC) during long-term storage, avoid full charge (accelerate SEI film growth) or low power (cause copper foil corrosion).
Temperature management: Store in an environment of 15-25℃. High temperature (>35℃) will cause a monthly capacity decay of 5%, and low temperature (<0℃) will slow down aging, but needs to avoid freezing.
Professional storage solution
Package in anti-static sealed bags, and control humidity at RH30%-50%.
Recharge to 50% every 3 months to offset self-discharge (monthly self-discharge rate is about 2-3%).
2. Usage specifications
Charging strategy
Range limit: Keep the power range of 20%-80% for daily use, and the number of full charge and discharge cycles will reduce the capacity decay by 60%.
Charging speed: 0.5C slow charging (such as 5V2A) is preferred, and fast charging (>1C) is only used for emergency (no more than 3 times a week).
Temperature control
The operating temperature is controlled at 10-35℃, avoiding:
• High temperature scene: direct sunlight into the car (the temperature inside the car can reach 70℃ in summer).
• Low temperature charging: Charging below 0℃ can easily cause lithium dendrites.
3. Equipment-level protection
Smart system utilization
Enable the “optimized charging” function of the mobile phone/computer, and AI learns charging habits to delay the full charging time.
Set the charging limit of electric vehicles to 90%, and let it stand for 30 minutes after DC fast charging before using it.
Hardware protection
Use a charger with over-temperature protection.
The drone battery is equipped with an active heat dissipation bracket.
4. Special scene processing
Long-term parking (>6 months): disconnect the negative pole and balance the battery pack to the same voltage.
Use in high temperature environment: use a phase change material heat sink.
Accidental deep discharge: immediately pre-charge to 20% with a small current of 0.1C and then use it normally.

1. Material safety
No harmful heavy metals such as lead and cadmium (lead-acid batteries contain lead, and nickel-cadmium batteries contain cadmium).
The positive electrode material (such as LiFePO₄) is non-toxic, and the organic solvent of the electrolyte can be harmlessly treated.
Solid electrolyte technology (such as sulfide solid-state batteries) eliminates the hidden danger of liquid electrolyte leakage.
2. Secondary use
Retired power batteries (remaining capacity 70-80%) are converted to grid energy storage, extending the service life by 5-8 years.
3. Energy efficiency contribution
The carbon footprint of storing 1kWh of solar power is 85% lower than that of coal-fired power generation.
Offshore wind power supporting lithium battery energy storage system increases energy utilization by 30%.
Emission reduction of electric vehicle lithium batteries throughout the life cycle: CO₂ emissions per kilometer are 60% less than fuel vehicles.
4. Low-carbon manufacturing process
Energy consumption of hydrometallurgical recycling is 40% lower than that of primary ore mining.
Pollution prevention and control
The EU’s “New Battery Regulation” requires that the proportion of cobalt and nickel recycled from lithium batteries reach 90% by 2030.
China’s “Technical Specifications for Pollution Control of Waste Lithium-ion Batteries” standardizes the processing process.

Charging lithium-ion batteries requires scientific processes and safety regulations:
I. Standardized charging process (CC-CV mode)
Trickle pre-charge phase
When the voltage is <3.0V, use a small current of 0.1C to activate to avoid lithium dendrites caused by large current shock.
Constant current charging phase.
Quickly charge to 4.0V (LiCoO₂) or 3.45V (LiFePO₄) with a current of 0.5-1C, which takes about 60-80 minutes.
Constant voltage charging phase
Maintain the cut-off voltage (±0.05V accuracy), and terminate when the current gradually drops to 0.05C to ensure that more than 95% of the capacity is charged.
II. Industrial-grade charging solution
Multi-cell series battery pack: active balanced charging (patent CN105428741B), adjust the current in stages, and eliminate the difference of monomers <0.5%.
Silicon negative electrode battery: Gradient voltage drop method (patent CN112072722B), inhibiting volume expansion, and increasing cycle life by 40%.
Low temperature environment (<-10℃): preheating + 0.2C slow charge to avoid lithium metal precipitation, and charging efficiency reaches 85%.
Ⅲ. Safety operation specifications
Equipment selection
A smart charger with BMS must be used, supporting OVP/OCP/SCP protection.
Environmental control
Operating temperature: 10-35℃ (automatically reduce power if out of range)
Heat dissipation requirements: ≥5cm ventilation spacing, avoid direct sunlight.
Abnormal handling
Immediately stop charging when the single cell voltage difference is detected to be >0.3V (balance maintenance is required).
Temperature exceeding 55℃ triggers forced power off.