[ni-Co-Li Summit] Application of multicomponent composite system based on lithium manganate in power battery

SMM7: Wang Zhengwei, Deputy General Manager of Xingheng Power Co., Ltd., explained on the spot the application of lithium manganate-based multicomponent composite system in power battery at the 2020 (Fifth) China International Nickel-Cobalt-Lithium Summit Forum and China International New Energy Lithium Materials Conference held by SMM, and analyzed in detail the diversified layout of new energy products, the application and advantages of manganese multicomponent composite system.

Diversified new energy market

Wang Zhengwei said that with the implementation of the national standard of electric bicycles and policies such as purchase and emission restrictions, the new energy power market is accelerating to form a pattern of two-wheel and three-wheeled light vehicles, special-purpose vehicles (logistics vehicles) and dual-100 electric vehicles and long-range electric vehicles going hand in hand.

In the past five years, the sales of lithium electric two-wheeled vehicles have increased year after year, with a growth rate of more than 30%, reaching a high growth rate of 65.5% in 2019; new energy special vehicles will maintain steady growth; and passenger vehicles will maintain rapid growth, with a compound growth rate of 33.3% from 2019 to 2023. Based on light vehicles, logistics vehicles and double 100 electric vehicles, Xing Heng promotes the development of the long-lasting pure electric vehicle market, forms a market-oriented product positioning, and promotes the diversified growth of Xing Heng.

Based on lithium manganate, the products are mainly used in three major fields: two-wheel and three-wheel electric vehicles, logistics vehicles, double 100 electric vehicles and long-range electric vehicles. Xing Heng's troika is composed of two-wheeled and three-wheeled electric vehicles, logistics vehicles, double 100 electric vehicles and long-range electric vehicles to promote the diversified development of Xingheng in the field of new energy.

Diversified product layout

Based on lithium manganate, multi-material system composite: products are mainly used in two-wheel and three-wheel electric vehicles, logistics and double 100 electric vehicles, long-range electric vehicles.

Manganese series multicomponent composite system

Lithium manganate is a suitable material for the market application of two-wheel and three-wheel electric vehicles because of its low cost, good safety, good low temperature performance and high voltage platform. In recent years, lithium manganate is more and more widely used in lithium electricity industry. Manganese series multicomponent composite system is the mainstream technical route of electric bicycle battery, and it also has a place in the field of passenger cars and commercial electric vehicles.

The main advantages are as follows:

1. Good cycling stability at room temperature and high temperature to ensure battery life

2. Excellent low temperature discharge performance to ensure the use of batteries in low temperature environment

3. It has the highest performance-to-price ratio in the existing material system.

4. After the battery is recovered and repaired by unique technology, the secondary life of the cycle at room temperature can reach more than 1500 times.

5. By the end of December 2019, the cumulative sales of light vehicle batteries have been 11 million sets, which has been tested by the market for 16 years.

Manganese series multi-component composite system includes: 1. Single crystal lithium manganate has small specific surface area and few exposed 111 surfaces, which inhibits the dissolution of manganese.

2. Pure CA system (a new material based on manganese): it has excellent room temperature and high temperature cycle performance; the 2400th capacity of room temperature cycle is still more than 100%, and the 2200th capacity of high temperature cycle is still more than 80%.

3. Lithium manganate-CA system: excellent cycle performance, especially high temperature cycle, low energy density and relatively high cost.

4. Ternary-CA system: high temperature 55 ℃ cycle 2200th capacity is still more than 87%; high cost, currently used as a technical reserve

Wang Zhengwei said that considering safety, performance, cost and energy density, lithium manganate-CA& ternary composite system was selected. Compared with the conventional dynamic LMO, the cycle performance of single crystal LMO is obviously improved, and the new CA material system has excellent high temperature performance (cycle / storage / magnification), which makes up for the shortcomings of the existing lithium manganate, and the safety performance is better than that of ternary materials. Manganese multicomponent composite system (lithium manganate-CA& ternary) takes into account the performance / safety / cost / energy density, the design is more flexible, and there is no deficiency in performance. it is the most cost-effective lithium-ion power battery material system, and will have a broad market application prospect in electric bicycles, electric vehicles, energy storage and other fields in the future.

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