New technology makes lithium batteries more resistant to high temperature and improves safety

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Recently, at the 57th Japan Battery Conference, Huawei's Central Research Institute Watt Laboratory announced that it has achieved a major research breakthrough in the field of lithium-ion batteries and launched the industry's first high-temperature and long-life graphene-based lithium-ion battery.

The breakthrough mainly comes from three aspects

According to Dr. Li Yangxing, chief scientist of Huawei's Watt Laboratory, the technological breakthroughs in graphene-based high-temperature lithium-ion batteries mainly come from three aspects: adding special additives to the electrolyte to remove trace amounts of water and avoid high-temperature decomposition of the electrolyte; The large single-crystal ternary material with high performance improves the thermal stability of the material; at the same time, the new material graphene is used to achieve efficient heat dissipation between the lithium-ion battery and the environment.

Dr. Li Yangxing said, "The charge-discharge test in a high-temperature environment shows that, under the same working parameters, the temperature rise of the graphene-based high-temperature lithium-ion battery is 5°C lower than that of ordinary lithium-ion batteries; the capacity retention rate is 2000 cycles at 60°C. Still more than 70%; storage at 60°C for 200 days, the capacity loss is less than 13%". It is reported that this research result will bring innovation to the energy storage business of communication base stations. The working life of the external base station using the high-temperature lithium-ion battery in hot areas can reach more than 4 years. Graphene-based lithium-ion batteries will also help electric vehicles last longer in high-temperature environments, and drones can fly safely under high-temperature heat.

It is understood that the current "lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Industry analysts believe that Huawei's graphene-based lithium-ion batteries are still lithium-ion batteries.

Longer battery life
And at the 56th Japan Battery Conference last year, Huawei's Watt Lab released the results of fast charging technology that can fill 48% of a 3000mAh battery in 5 minutes, which has attracted widespread attention from the lithium battery and mobile phone industries. According to Dr. Li Yangxing, Huawei's fast-charging battery has been commercialized, and will officially release a super-fast-charging mobile phone at the end of December this year.

Regarding Huawei's launch of the industry's first high-temperature and long-life graphene-based lithium-ion battery, the industry believes that if the battery is used in conjunction with fast charging technology, it will greatly improve the battery life of smartphones and fully satisfy the needs of many mobile phone users. After a variety of applications, the mobile phone can still be kept charged for a long time. At the same time, because Huawei's new technology makes lithium batteries more suitable for high-temperature environments, lithium batteries used in technology products such as mobile phones and notebook computers are more "high temperature resistant" and their safety is improved.

It is understood that there are many problems with smart phone batteries at present, because the mainstream fast charging technology is generally implemented by increasing the voltage, which can easily lead to overheating of the battery and bring about the charging safety hazards of mobile phones and laptops. Many well-known mobile phone manufacturers and notebook manufacturers have recalled because of battery problems.

In April 2016, Japan's Toshiba Corporation announced a global recall of 100,000 notebook computer products. The reason for the recall was the battery problem. Toshiba said that the recalled notebook computer batteries have a hidden danger of overheating, and there have been four reports of battery overheating and melting.

In June this year, HP Technology filed a recall plan with the General Administration of Quality Supervision, Inspection and Quarantine, recalling some HP notebook battery packs produced from March 2013 to May 2014. The number of battery packs affected in mainland China is 6,726; this year 9 In January, Samsung's Note7 was recalled worldwide due to a burning incident caused by overheating of the battery. Some analysts believe that when the lithium battery is damaged by external forces such as internal short circuit and excessive temperature, it is easy to catch fire and explode in an instant.

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